Compact 80m Nvis Antenna265 - Vertical Delta Loop for 40m to 10m. A planar reflector placed on the ground below an NVIS dipole, 1-λ loop, or Inverted Vee yields about 1 dB gain It has a negligible effect on the antenna’s …. SIZE: Packs down to a 6"x4" (15x10cm) compact roll for portability. JENNINGS RJ2B or C, rated @ 6kV HF - see specs here) to switch over the wire antenna from EFHW transformer secondary to the coax feed & capacitor of 270pF / 3kV (doorknob type, this type is able to withstand high RF current - the small blue ones will not handle QRO !) a 16A/220v relay to switch over the. 40m amateur band for daytime and 75/80m for nighttime …. 80m Antenna for Small Gardens - A 46ft multi-band antenna for small gardens that works on 80m. Rubbermaid Microfiber Flat Spin Mopping…. Does Lowering an NVIS Antenna Improve It? – Practical Antennas. Yeah the half-size has its charms, chiefly that it makes a dandy compact NVIS antenna. The two versions are a wire element loop with 3m sides, and a solid element loop with 2. The physical layout and the phasing action of the controller give the system the ability to point in one of 4 directions as well as an omni-directional mode. HF Indoor Loop Antenna DIY--Simple & Easy to Build HF Mobile Antennas and Their Installation. A Near Vertical Incidence Skywave (NVIS) Mode Antenna System For 80 And 60 Meter Local and Medium Distance HF Communications By Gary Wilson, K2GW. NVIS Page 2; NVIS Page 3; NVIS Page 4; NVIS Page 5; NVIS Page 6; NVIS Page 7; NVIS Page 8; NVIS Army FM 24-18; Simple 2-meter Antenna; 2-Meter Sleeve Dipole; I would like to build an 80-meter doublet to be used from 80m to 10m. So, for 80m this would be 24 m (80 feet: conveniently, in . HF Vertical multiband antenna (6m - 40m) in a very compact …. nut to convert it quickly for 80M use. You'll HF Vertical multiband antenna (6m - 40m) in a very compact lightweight package. Super Antenna MP1DXTR80 HF SuperWhip Tripod All Band 80m MP1 Antenna with Clamp Mount and Go Bag ham 9. MFJ has a 40/80 meter dipole that's only 84 feet long. Grit: The Power of Passion and Perseverance. What is full size on 80m - ¼ wave 66ft, ½ wave 133ft - other bands ½ wave multiples not matched by ATU/Coupler ( v. 80M END FED ZEPP ANTENNA The MFJ-1748 End Fed Zepp is an end-fed wire antenna that, when properly erected and fed with balanced feedline through an antenna tuner, will be usable on all amateur bands from 80 to 10 Meters. At least one of the stations working a test will of necessity not be within ground wave distance of other stations in the test. Think of the "Carolina" windom antenna (the modern version of the windom) as an "upside down vertical antenna", hanging down from its counterpoise strung (more or less horizontally) some 10 meters (or more) above ground. After watching the video, please read the field test stories below the video as this design flies in the face of a theoretical 80-meter NVIS antenna design. Editors note: Just think, you're on the air on 80 meters with this stealth antenna, and there is a good chance it can be used on more bands above 80 meters with a tuner!. So a NVIS antenna can be set up almost any where on the ground that is level. , 4 times) over a simple low dipole are possible • Consider horizontal loop or Lazy H over a. The ‘HAM BANDIT’ evaluates the COMPACtenna 20″ Shortwave antenna – YouTube Link. The OPTIMUM NVIS antenna height for 80 through 40 meters is about 30-feet!! Please note the following trends as we decrease …. HF NVIS Loop Antenna The HF230L_OTM is a compact HF antenna for on-the-move vehicular platforms from 2 to 30 MHz. If you're having a difficult time getting an 80 meter or 160 meter antenna to fit the limited space of your property, then this video from Callum (M0MCX) may help solve your problem. He uses this antenna efficiently on several bands from 160 thru 20m, but he has three different matchboxes, one for Top Band, one for 80m and one for 40/30/20m. 0 to Field Day and set it up as a NVIS antenna. Always cool to start hearing the other end when your antenna is only 1meter off the ground. With the broad range of the vacuum variable capacitor, this antenna does show resonance at 80m, 30m, 20m and 17m and more, but not good enough for me to bother using it on these bands except maybe 30m. NVIS Antenna Strategy • Portable and field antennas will be less efficient due to space, height and setup time • “Command post” or “Net Control” antenna should be as efficient as possible • Gains of up to 6 dB (i. The insulation is great for maintaining antenna. Magnetic Loops are great stealth antenna!. 4 Mobile NVIS antennas14 4 Conclusion 15. The NVIS antenna described is based on the proven information from the military AS-2259/GR antenna. End Fed Half Wave Antenna (EFHW) …. Below is a schematic of the basic idea behind this antenna. NVIS can be considered a special case of skywave propagation, and thus emphasis is placed on ionospheric propagation, in particular the role of frequency and incidence angle. Can be used on 80m with an ATU (SWR drop over the 80m …. But if you're in to building your own antennas, there are plans for loading coils & traps on the net. I've been studying the NVIS solution document posted at Buddiepole. During disasters, WA communicators need to be able to reliably communicate with W7EMD at Camp Murray (State EOC) other sites around the region via HF on 75 (Pri. Near Vertical Incident Skywave (NVIS) Antenna. Simplicity in design was the first thing, with a cost of less than $20 for the PVC pipe, and $4 worth of #14 stranded wire. As well as the compact mobile HF loop, two versions of fixed station loop antennas are also available, which operate on both NVIS and long distance sky-wave propagation modes across 3-30MHz. 4x4 Equipment Ambulance Communications Fleet Management General Equipment Packages Power …. Or, install an insulator, and a wire jumper with an alligator clip and you have a quick ‘n easy 40-80M antenna. Watch the following video to see how to build and erect a basic 80-meter NVIS antenna. DX Engineering 8040 NVIS Antennas: Near Vertical Incidence Skywave (NVIS) is a propagation mode which uses high-angle radiation that sends signals. It’s a great HF antenna for the ham radio operator with a smaller backyard! The goal in this video is to focus on construction. One step further is operation on 160m and/or 60m bands possible ? Yes sure ! By inserting a base loading coil in the '80m …. A Portable NVIS Antenna Portable No Tune End Fed Half Wave Antenna 80-10m Or, install an insulator, and a wire jumper with an alligator clip and you have a quick 'n easy 40-80M antenna On HF, one of the factors that determine how far your signal goes is the takeoff angle Terminated Sloper Antenna 25 39 Terminated Sloper Antenna …. Type: PDF; Date: November 2019; Size: 362. 263 - Low Radiation Angle Inverted Delta Loop for 80m. 5' 15' 54 pF 31' 31' 142 pF 55 uH. The larger version the DXE-NVIS-8040 is a full size 80 and 40 meter NVIS antenna that uses no coils. I recently purchased a second hand ICOM 706 Transceiver. 160M Loop Antenna Project. Extends and fans out to 4 full size quarter-wave wires (1 wire for 17m band, 1 wire for 15m band, 1 wire for 12m/11m band, 1 wire for 10m band). Contacts were made on both 80 and 40 meters ranging from 15 miles to 2,000 miles. A vertical tends to be more noisy than a horizontal wire, and 80 meters is a noisy band during the day. NEFR South Arm 80-Meter NVIS Test. NVIS operations are optimized by understanding and controlling two major factors: (1) Proper antenna design and placement, and (2) proper training of the operators. I highly suggest familiarizing yourself with EZNEC for building and modelling antennas for both efficiency and directivity. That said, I typically get better reports on 80m with my EFHW deployed as an inverted V in the 100-400 mile range. Comparative efficiency of AS-2259 portable NVIS antenna. high Z) Forget miracle antennas – …. 5m (5 feet) in the vertical direction, we see there is about a 10 dB. Fits in a space as small as 2 5 ft across, and can be mounted low level and still be effective for DX and NVIS. 5~57) Broadband Ground-Plane Vertical Base Antenna -. Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and conventional skywave distances—usually 30-400 miles (50-650 km). To my pleasant surprise it was optimized at 3. It feeds ("induces") the radio signals to/from the BIG loop. The SlinkTenna is a compact, quick deploy, portable, helical ham radio antenna. Highlights: The red lines reveal the …. Antenna length is 85 feet (standard half-wave antenna at 80 m would be 131 ft . The antenna turned out to have total length 27. Ideas for compact 80m/160m antenna DX; HF Doublet Antenna in a Small Garden; Hom(e)brew open wire feeder; A Timber Antenna …. Portable/Trail friendly resonant 80. One of this summer's projects was to put up a full-wave 80 meter horizontal loop antenna, sometimes called a "loop skywire". 40 meter band antennas projects category is a curation of 220 web resources on , The 40M Extended Double Zepp, Shrunken 40 Meter Phased Quads, G5RV Beam. CLICK or TAP HERE to read about the successful test and listen to the actual audio recording of the test. The following describes my NVIS portable antenna solution, only one of many different ways to implement such an antenna. In the article below, I'd like to describe the theory and the mechanical build process for a 160m-long multiband loop antenna, including its support system, tuning, and SWR analysis. NVIS rarely works at frequencies outside the range of 2 MHz to 10 MHz. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching. 25 wavelengths (or lower) above ground. 80 Meter NVIS Antenna - Don't Get Hung Up on Theory UPDATE: Since this article was originally published, I went to the pesky South Arm NEFR . Be sure to check any antenna for SWR and impedance before transmitting. 0 Modular Portable Antenna System. SWR appears to be lower after sunset and slightly higher after sunrise. Build yourself a 40/80m antenna for small gardens – Part One. Shark Antennas S-FM80 Mono Band…. Even though I normally operate QRP or sometimes up to 10 watts I nearly always get a signal report that is either equal to or only one S-unit lower than the QRO stations I qso with. Locally customize as required, you won't need to bring ALL this stuff if you've done a little pre-planning. Broad elevation coordinate signal pattern and elliptical polarization of COMPACtenna provides stabilized signal of long and short (low and high angle) ionosphere propagation paths and ‘hops’, including NVIS. The most suitable frequencies for this mode of communication are 160, 80-meter, and 40-meter during the day. Far-field patterns for the 40m , 80m, and 160m bands for a SRL are shown in Figure 1 through Figure 9. Although focused on operating NVIS propagation from a 20 Watt field radio such as the PRC-150, the antenna is capable of fully automatic, low SWR operation from 1. GRA-1899T multiband HF VHF (80m-6m)…. The stand alone 80m loop is approximately four feet in diameter. The inverted vee is another good NVIS antenna so long as the apex angle is kept gentle--about 120 degrees or greater. I have a packtenna 9:1 random wire antenna and a sotabeams bandspringer midi 60-10m but I believe these can be sort of used on 80m. • A NVIS antenna is very portable. 6m dipole at 17'made from leftover BuddiPole parts VHF / UHF / Beyond : Diamond D-130 Discone antenna with 25-1300 MHz. Antenna Performance for NVIS Comms. 8-30 Mc center-loaded HF whip, 51 Mc Whip, 28/27 Mc whip, GPS antenna under a radome on roof, 145 Mc 5/8 wave whip and VHF/UHF scanner whip. Bushcomm Brochure & Product Library. Barker & Williamson's MP manpack broadband folded dipole antennas, together with our manpack mast system, gives forward units the HF communications capability of a rear unit in one small, light, rapidly deployable kit. 40 meter band antennas projects category is a curation of 220 web resources on , The 40M Extended Double Zepp, Shrunken 40 Meter Phased …. Homebrew 80m/40m NVIS Antenna Homebrew 40m-6m Vertical Antenna DK9SQ 33-ft Telescoping Fiberglass Mast Hand-Held Radios Yaesu VX-170 2m FM Transceiver A tradition of innovation There are several designs for NVIS antennas…. • The NVIS allows you to make reliable contacts from 30 to 400 miles away. On the EFHW I regularly check into Florida regional 80m NVIS nets with 20W SSB phone and am. NVIS Antenna Models and the Ground Type (80m, 60m, 40m) 10. This is not an antenna for DX work, but for 75/80m rag chewing it can't be beat! Drop me a line or shout at me on the air for more information. I feel like 80m would be essential for NVIS as we can't always assume 40m would be open. 80M Dipole NVIS Antenna I just completed an experiment building an 80M dipole that is focused on NVIS propagation. Those are the basics, now I'll give you the background. Teyleten Robot Portable No Tune…. See full list on practicalantennas. Or, install an insulator, and a wire jumper with an alligator clip and you have a quick 'n easy 40-80M antenna. This is a down and dirty, under 1,500-word DIY article […]. Add 6 white end insulators (dog-bones), a center insulator (Alpha Delta), 4 Double Coat Hangers and you are ready to go at under $40 for a three band Resonant N. Here are a couple of thoughts on 80m antennas for NVIS (near vertical incident radiation) good for daytime, short-skip, NOT for low-angle DX . Yes, coils might make it resonate at 80m, but it would be terribly inefficient. I should note the Bravo Antennas from Schiller are more compact and portable than this 2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD APRS Baluns battery BigIR Diamond dipole DX-Eng. Any higher and the antenna may not work properly and your Compact Travel . What is full size on 80m – ¼ wave 66ft, ½ wave 133ft – other bands ½ wave multiples not matched by ATU/Coupler ( v. A 43ft tall antenna is getting fairly large but not large enough to be more efficient on 80m than a large but low cloud burner dipole. Tim Carter, W3ATB, demonstrates how to build and …. Several Radio Amateurs have built variations of this antenna and have reported excellent performance on 80m with good DX, especially in such a small space. This will not provide a good match to 50 ohm coax. This is an End Fed Long Wire wire antenna that will cover all bands from 80 to10 meters, …. Discontinued Alpha Antenna 6. Signal level decreases rapidly as height is lower than about. 820 MHz the antenna has a feed point impedance of 12. By “fixed station” I mean a permanent location which affords us better opportunity to optimize our antenna than would a …. Antenna selection should match the frequency band for VHF and UHF "HF Loop Antennas" is the topic of the just-released episode of the "ARRL The Doctor is In" podcast Figure 24: Improved NVIS Performance Of A HF Vertical Whip Antenna Another option for limited space and mobile HF NVIS operation is the vertically oriented loop antenna as shown in Figures 25 G5RV HF Antenna …. Shoe Dog: A Memoir by the Creator of Nike. Having the dipole closer to ground can also significantly reduce the noise level, which may permit receiving weaker signals than would otherwise occur. 80 Meters frame antenna Frame antenna for 80 and 160 meters band 160/80m Coaxial Receiving Loop Antennas Receiving loop antenna for top band. NVIS 80m with 160m Full Wave Loop is less than ideal. How to get saturation coverage in the skip zone; Tom Sanders, W6QJI Ed Bruette, N7NVP. Switching my NVIS loop in to circuit brought the. Super Antenna MR8075 SuperWire Radial…. As you note, horses for courses. Easy Installation and Operation – The Antenna is easily installable on the hard roof of vehicles, end both installation & operation does not require highly qualified radio personnel. Out of the over 1800 QSOs reflected in both graphs above, over 1700 were with fixed stations… many reportedly with horizontal, NVIS friendly, low dipoles. 11 m CB Band NEARLY INVISABLE DX antenna for 27. The pattern may extend beyond 300 miles depending antenna height and upon environmental conditions. long- range circuit, short-range communications also require proper antenna selection. I've built such a dipole for 20, 40, 80m bands once. compact ANTENNAS small Powerful Antennas for Ham Radio CB ionosphere propagation paths and ‘hops’, including NVIS. I still needed the ability to operate on 75-meter NTS, RACES nets or the 60-meter MidAtlantic Emergency net. NC Scout – Senior Leader; Jesse James – Senior Editor; Patriotman – Senior Editor …. antenna conﬁguration and shorten the antenna for 80 m operation. NVIS Antennas for 20m and 80m COMMS. This inspired me to build a bigger loop for HF! Here is what I came up with LimeSDR-USB HF - 3 I found an SMA female to 3 Some try to use a GDO (grid dip oscillator, or its solid state equivalent) but the typical dial frequency calibration on one of these is usually poor anyway Unlike any other similar antennas …. Can be adapted to work on 160 meters by adding additional 6. Chameleon Antenna Portable Collapsible HF (25-54MHz) Suggestions for portable 80m antenna, com 6 Meter 5/8 Wave Vertical Antenna The G3JVL 6 Meter ground plane vertical is a compact antenna that is ideal for portable …. long, about the size of a 40m dipole. SC-750 Series 11, HF Wire Antennas, Transmission Line Design, Miniloop 1 02-02-1998 DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft 5:1 on 6, 10, 20, 40 & 80m bands and can be operated without an antenna tuner 5:1 on 6, 10, 20, 40 & 80m …. The Inverted-L Antenna and NVIS. THIS IS: Super Antenna Low Profile tripod Go Bag setup for all HF Bands 80m-10m and simultaneous VHF 2 meters. Since most of HF EMCOMM work is in the 40 and 80 meter bands, the next step was to cut another 33 ft. Pull the wire out straight, cut it and scrape the enamel …. On August 15, 2016 By ncscout In communications. EFHW Elecraft end-fed EZNEC Field Day Golden Packet hexbeam J-Pole Kenwood kj4faj KX3 kx4o measurement mobile NEC NMO NVIS …. The Near Vertical Incident Skywave (NVIS) antenna is a half-wave dipole antenna mounted not over 1/8th wave above ground (at the highest operating frequency). It bridges the gap between VHF/UHF communications and longer distance skip on HF. The Hilomast, LLC Mobile HF Loop Antenna, developed for NVIS (Near Vertical Incidence Skywave) communication across 3-15MHz, overcomes these limitations by having high-radiation efficiency and no skip zone whatsoever. Studying the Radiation Patterns for various loop shapes, the square loop fed in one corner (or “diamond loop”) seemed like the best candidate, with patterns like these: 20m pattern. End Fed 80 - 10 meters HF Multi Band Antenna 300 watts unun. On the bands above 20m it will work, I'm about to put up my CHA 80 meter skyloop Going to utilize it as a NVIS antenna for 80M rag chew. The signal must penetrate the D layer of the ionosphere and bounce off. The HF230L-N is a compact HF antenna for naval applications operating over a frequency range of 1. ) This antenna is basically nothing more than a unbalanced, 1/4 wavelength, horizontal. As it is lowered, the impedance drops. 267 - Bi-Square Beam Gain=3dBd for 17m. Here is one way to squeeze in a resonant 160 meter antenna (no coils) where you don't have enough horizontal space for a full-length dipole. NVIS propagation is one more weapon in the …. In other words, the 22 feet vertical component of the "Carolina" - between the 4:1 matching voltage transformer and the current choke balun - is a. 110 views, 9 likes, 0 loves, 0 comments, 1 shares, Facebook Watch Videos from SurvivalTech Nord: 10 watt #NVIS #antenna test on 80m #js8call …. Inter-G signals were virtually unreadable, to the point I thought it wasn't working. The reflecting element is 5% longer than the driven element and is …. I don’t thinking looping around will work. FOR HAMS WHO DON'T HAVE 40m (130 ft. Specifically, frequencies from 1. The loop base is approximately five feet (5') above ground, which places its top corner at about eight feet (8') above ground. NG9D provides installation details, theory of operation, and a brief demonstration of how the antenna is deployed and used. Two 75 foot bundles would make a great 80M dipole A Linear Loaded Vertical Antenna for 40m and 80m by PA3HBB As a lot of you will appreciate, to work good DX requires a low angle of radiation from the antenna I've more or less given up on 80m …. Ohio is roughly 200 miles square, so the NVIS antenna was the ideal match. HF NVIS Antenna System - 3028-900 The 3028-900 HF Antenna System is a lightweight, quick to erect, NVIS (Near Vertical Incident Skywave) antenna …. In this video, NG9D describes a basic, easily-made 80 meter NVIS antenna suitable for portable or emergency use. The antenna is fed about 23 feet in from one end of the antenna. A multiband 80-40-20-15 meters dipole wire antenna that can be extended to cover 160 meters too. West Grey Ham VE3LDP: 80m NVIS Antenna. A 7 band full size NVIS antenna resonant on both the voice portions and the digital portions of the bands as well as 60 meters. More designs can be found by Googling “80m loaded dipole. The AS-2259 Antenna – Practical Antennas. The antenna comes with a center support and the four assembled and marked antenna elements. The typical NVIS antenna pattern shows the signal power at 20 degrees is down 20db, so it is more likely that 1000-2000 mile contacts are made not by the …. 99 Low in stock Add to cart Selling fast! Only 6 left, and over 20 …. 80 Meter NVIS Antenna Share Watch on. 270 - Wideband Sloping Vee Antenna - 30m to 6m. Overview: The first thing that I noticed was that during daylight hours, the vertical was utterly hopeless. The over all length of the 40-meter off center fed antenna is 66 feet. He based his design on the AS-2259/GR a military, dual band NVIS antenna set. It is designed to provide superior Near Vertical Incident Skywave (NVIS) performance at distances from 0 to 500 km and allows continuous communications in ground-wave, NVIS and skywave applications. high Z) Forget miracle antennas – they cannot work at all well – they just don't have the aerial aperture for it! Loading coils and capacitance devices have losses ( capacitance least) but so do ATUs/Couplers. LMD18201, mast, microcontoller, NVIS, octagon, PicAxe, PX3, small loop, Solidworks, speaker stand, STL, toroid, transformer, type 43 Post. Anyone in the Pacific NW want to try 80m? i put up a low nvis antenna and have the tnc on 3593. Near Vertical Incidence Skywave (NVIS) is an ionospheric skip with such low antenna height, particularly using the 80-meter band. An NVIS antenna is one that has peak radiation at or nearly straight up, not toward the horizon All of our antennas come with 20' control cable, standard up and down switch, ferrite core, fuseholder and fuse, 3/8-24 stud and matching coil if needed with antenna Fourth would be a 1/4 wave sloper off the side of the house SWR Meter Setup ICOM 2200H --> SWR Meter --> Slim Jim Antenna …. THE STEALTH LOOP is a small HF antenna with continuous coverage from 40 to 10 m 2018 Mobile magnetic loop HF antenna - P/N 2018-00-01 Ideal for NVIS propagation or applications requiring constant coverage for distances of 0-1000km, the loop antenna provides significantly more gain than conventional whip antenna systems Isotron Antennas : - Antennas …. This is not a bad compromise considering the low angle that is achieved. The Buddipole Quick-fix for NVIS on the Lower Bands One of the best and most-used antennas for NVIS, or Near Vertical Incidence Skywave, is a dipole low to …. Antenna Loop Magnetic Capacitor. It also worked on 10/12/15/17/30m bands with SWR about 2. PDF 160m/80m Broadband Antenna by K5GP. A blog about Amateur Radio and Amateur Radio Antennas. Thanks to Nick Meacher of "Survival Dispatch" for this comprehensive discussion on NVIS antennas for the 20 meter and 80 meter amateur radio bands. Resources listed under 40 Meter Antennas category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Also did some shortwave listening on it, bypassing the tuner and just going through the 4:1 balun. Steve built an NVIS antenna to compare with the G5RV he has at 30 some foot height. Super Antenna MP1LXMAX Deluxe Tripod…. Theory, Modeling, and Practical Applications By W5JCK. Heights of 5 to 10 feet above ground are not unusual for NVIS setups. IC 705 listening on 80m NVIS I know the 80m NVIS antenna is pretty good and receiving signals across multiple bands, however, while swapping antennas at one point I still had the 80m NVIS antenna …. Although NVIS antennas are most frequently considered for emergency communications by most radio amateurs, it can also have a place in radio …. Classic but EXTRA in the box: 2 x …. My first antenna was an OCF Dipole from Buckmaster which covers 80m – 10m (15m excepted) You can …. The G1EXK Ultra Compact 60m Antenna. The ladder line will be about 110′ long. NVIS I - Near Vertical Incident Skywave Antennas -- By Patricia Gibbons - WA6UBE NVIS II - Near Vertical Incident Skywave Antennas Via WB5UDE NVIS …. The loop being modeled is diamond-shaped, 30in (2. The second section discusses the technical principles underlying NVIS, the different types of antennas. The on air experience of using this system is simultaneous omnidirectional NVIS and directional DX (reference the 3D Model below). Super Antenna MP1DXTR80 HF SuperWhip…. Search: Magnetic Loop Antenna Capacitor. Heights of 5 to 10 feet above ground …. HF loop antenna, NVIS, shipboard, 2 m, 1. Nick Meacher, Survival Dispatch resident communications expert dives into NVIS - Near Vertical Incident Skywave. By the time it gets to 7-8' high, the impedance is down to about 12 ohms. Unfortunately, it is difficult to find antennas suitable for NVIS that combine radiation efficiency, easy portability, and a compact footprint. With an antenna this compact, the coaxial feedline tries to become part of the antenna. Special thanks to GW3XHG for being my firs. A more accurate way to describe it would be 40-2M +80M +60M compact rapid deployment antenna system. The ARRL Antenna book has a section on Shortened dipoles with a chart for determining the approximate inductance values for off center loaded dipoles. I set the antenna up in the horizontal NVIS …. 06 wavelengths high (16 feet on 80M, 8 ft on 40M) field strength is down 3dB. This is an antenna theory that allows HF tra. ANTENNA FREQUENCY RANGE: 40m-30m-20m-17m-15m-12m-10m-6m-2m-220 Ham bands. It is designed to provide superior Near . The Buddipole™ - HF portable dipole antenna system, Welcome to the home of the Buddipole™, an hf/vhf portable dipole antenna system which is designed to be modular, versatile, and efficient. The only differences are three: 1. Field Day NVIS testing of Jumbo 80M Horizontal Buddipole with …. 10 80 m hf antennae: Editor Recommended. Field Day NVIS testing of Jumbo 80M Horizontal Buddipole with TRSB (compared to a full 120ft wire antenna). CLICK or TAP HERE to read about the conundrum. Our goal was to solve a pesky communications issue that has plagued the New England Forest Rally (NEFR) for many years. It will provide excellent short range communications …. • Due to this reflectivity, NVIS antennas typically use 40M for daytime contacts and 80 M for nighttime contacts. We call them NVIS or Cloud Burner antennas. 5~57) Broadband Ground-Plane Vertical Base Antenna –. Compact and Efficient Antennas for HF Radio Matt Roberts — matt-at-kk5jy-dot-net if NVIS response is desired, raising the antenna to near λ / 4 will remove much of its high-angle response. The available space limited me to 80m as the fundamental frequency. With QRP / LOW POWER becoming more popular, we have added some nice, small, and compact antennas to our line. An SWR of 2:1 or better was obtained from 1836 kHz to 1853 kHz without the need of an antenna …. Super Antenna MP1DXMAX Low Profile Tripod 80m-10m HF +2m VHF Portable Antenna with Go Bags ham Radio Amateur. NVIS Deployment Typical frequency ranges used for NVIS are usually between 2. SWR at end of feedline measured as 1,4:1. Signal level decreases rapidly as height is . Admin Note: This is the third and final section of the article …. 4 ohms, leading to a very high SWR. Specifically on my T-antenna with auto tuner at feed point/base, as the OP left a recent comment asking about this antenna, hence the focus of this antenna in this answer. This 40 and 80 meter inverted V antenna is made with loading coils. 05 wavelength, or approximately 14-feet. Much like lowering a dipole to increase high-angle response, installing a 40m or 80m loop at below its ideal height increases its NVIS. Post # HF Ham Radio Random Wire Portable Antenna Back Yar 10 Ultra Stealth Antenna Designs for HOAs. ATU less operation possible on …. On Saturday, October 10, 2020 I (Tim Carter – W3ATB) met with four other dedicated radio operators in Bethel, Maine. This antenna has been made popular by the Emergency Amateur Radio Club of Hawaii (EARCHI) The car electronic antenna is a non-directional antenna which can be mountedanywhere on your windshield For the best all-around performance with an amplifier and 80M, we highly suggest our 7-Band 3,000 Watt For the best all-around performance with an amplifier and 80M…. DIY Ham Radio Antennas - NVIS Antennas for 20m and 80m COMMS. A second advantage of lowering the antenna to near 1. " For the latest Amateur Radio. Guide, Each Part Number: HSR-6BTV ( 27 ) Estimated Ship Date: Today Oversize Documentation $241. Features our new Versahub™ feed point design. On the inside of the pipe measure the wire to the second hole and make a notch/fold here. Here I will describe a 12 foot diameter loop antenna …. When I first started looking at the NVIS antenna for "local" communication the consensus seemed to be that it was a dipole-type …. OSPOTA Contest Station NVIS Antenna made from DX Engineering Parts Icom 706 MkIIg MFJ-969 Tuner Astron 30 amp power supply AC Power - 1 kW gas generator KD8GGZ and KB8VJL NVIS Antenna. DX Engineering’s Near Vertical Incidence Skywave (NVIS) Antennas for both 80 and 40 meters are available in two models. Multi-band operation for 80m to 10m. Although NVIS antennas are most frequently considered for emergency communications by most radio amateurs, it can also have a place in radio contesting. 5m sides, each offering similar high efficiency. I now have individual 80 and 40 meter NVIS antennas. My first antenna was an OCF Dipole from Buckmaster which covers 80m – 10m (15m excepted) You can further reduce the height of the antenna by placing a capacitance "hat" at the top com: End Fed EFHW-8010-1K 80M-10M wire antenna: Go to amazon Orange County Radio Amateurs, North Carolina P Hf Antenna For Small Yard Hf Antenna …. NVIS is typically used on 160, 80/75, 60, and 40-meter bands by Amateur radio operators using relatively low horizontal wire dipole antennas. This antenna has been a good NVIS antenna for me on 80m and a relatively good DX antenna given the recent poor band conditions on 17m and 15m. high Z) Forget miracle antennas - they cannot work at all well - they just don't have the aerial aperture for it! Loading coils and capacitance devices have losses ( capacitance least) but so do ATUs/Couplers. 40 Meter Antennas : 40 meter band antennas projects. NVIS Antenna Strategy • Portable and field antennas will be less efficient due to space, height and setup time • “Command post” or “Net Control” …. Naturally tuned antenna that does not require an ATU on the resonant frequency. 2022 FMUSER FSN-5000T 5kw fm transmitter was created by the FMUSER development for compact 4U size high efficiency fm broadcasting the portable antenna pioneer because great radios deserve great antennas! NVIS antenna A Wonderful New World Manhwa Watch the following. But as part of that process we also have more complete studies on how to optimize antennas for this purpose. The practical solution is to keep your 160 meter antenna where it is and add a new simple 80 meter dipole 50 feet or less in height. The DX Vertical is our non-stealth OCF HF vertical dipole antenna. EZNEC, the preferred antenna modelling method, is referenced. EZNEC models of dipoles from the standard formula, fed directly with 50 ohm coax (blue line) or series matched (purple line). Small size (46ft long x 24ft high) 50 ohm Coaxial Feed. A Compact Broadband Patch Antenna for UHF RFID Tags. The wire itself is not critical as long as it is roughly this size. As such we, as an organization, have taken to using the Near Vertical Incident Skywave (NVIS) antenna on 40M and 75M (60M works very well but few …. I assume 160m is likely out of the question realistically due to antenna lengths and I don't think 160 is as useful for NVIS anyway if I recall. The EZ NVIS is a ready-to-deploy NVIS antenna based on an article by Carl Jelnick, N6VNG (SK). Ideas for compact 80m/160m antenna DX. Title: NVIS Antenna 1 NVIS Antenna. Hams have been making local contacts on 80m and 40m long before this mode was given such a fancy name to sell it to the military in the 1960s. • A NVIS antenna can be easily set up by one person and does not require trees or extensive supports (masts). Modify existing 80m dipole to cover entire 500 kHz width of the band. The "primary" of this transformer is a small loop of wire, fed by standard 50 Ohm coaxial cable (coax) that goes to your HF transceiver. The Super Antenna MP1DXMAX is a lightweight, 80-2m compact antenna system designed for today's (and yesterdays) popular mostly portable or field deployable rigs. This antenna allow to reduce noise on both bands. 80m Antenna for small gardens | G7FEK Am…. 5MHz) therefore also resonant on second, third, and fourth. Super Antenna MP1DXMAX Low Profile…. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. 0 MC plus a twin-lead J-Pole vertical for 2 meters. 3 wavelengths, corresponding to heights of 13. I could go +/- 500 kHZ and the VSWR remained below 2:1. Capable of automatically tuning across its frequency range in less than a 50th of a second, the Hilomast HF Loop Antenna is. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. Antennas include an AM-FM broadcast radio antenna, 1. This isn’t much, but if you are QRP every little bit helps. The MPAS Lite is a compact version of their MPAS 2. Use this wire to achieve top performance and long, trouble free operation. An antenna tuner is required for this antenna to properly function. Homebrew 80m/40m NVIS Antenna Homebrew 40m-6m Vertical Antenna DK9SQ 33-ft Telescoping Fiberglass Mast Hand-Held Radios Yaesu VX-170 2m FM Transceiver All of our antennas come with 20' control cable, standard up and down switch, ferrite core, fuseholder and fuse, 3/8-24 stud and matching coil if needed with antenna • Due to design the NVIS …. You may use 12- or 14-AWG instead. it; Views: 18237: Published: 27. Because the antenna is electrically significantly longer on 80m than on 160m, we have switched to a series resonant circuit. There is a 2m Winlink gateway just 5mi away in SoNH that I can regularly hit with portable or base radios but I cannot reliably hit 40m/80m Winlink HF gateways as my main antenna …. 5m (5 feet) above the ground: Relative pattern of NVIS dipoles broadside to the antenna at different heights If we look compare the red trace for 9m (30 feet) to the dark blue trace for 1. Typical performance characteristics of a 4SQ system: Gain: 5 dBi. SlinkTenna - 80m-6m Compact Quick Deploy Helical HF QRP Ham Radio Antenna $89. Sometimes, all you can use for 40 m field work is a low-slung portable dipole antenna. I'm about to put up my CHA 80 meter skyloop Going to utilize it as a NVIS antenna for 80M …. This is about 50% TX signal reduction. Near Vertical Incidence Skywave (NVIS). An 80m loop is 265 feet of wire. It is a resonant Half wave on 80m (3. 10 Best 10 Meter Base Antenna Of 2022. Just simple, effective and proven antennas. It’s Monday (March 11) and this needs to be done by Friday (March 15). It's Monday (March 11) and this needs to be done by Friday (March 15). An “Inverted-L” antenna is basically a wire antenna, typically ¼ to ½ wavelength long on the band it is …. Having 20m on the antenna is also nice for when I'd like to do POTA etc. Twenty-one stations were expeditions with portable antennas of unknown topology. P1: 80M Dipole NVIS Antenna – Ham2Ham. This is a very common site limitation for any HF antenna …. This is post 2183 in a continuing series of simple ham radio antennas. The following plot shows the relative patterns of 80m dipoles from 9m (30 feet) down to 1. 99 Add To Cart Compare Wish List Butternut HF9V 9-Band Vertical Antennas HF9V. The antenna is designed and placed to. It includes pre-made Jungle Antenna ground planes cut for 28 MC and 51. Super Antenna MP1DXMAX Low Profile Tripod 80m-10m HF +2m VHF Portable Antenna – Big Signal in a Small Package. Antenna selection should match the frequency band for VHF and UHF "HF Loop Antennas" is the topic of the just-released episode of the "ARRL The Doctor is In" podcast Figure 24: Improved NVIS Performance Of A HF Vertical Whip Antenna Another option for limited space and mobile HF NVIS operation is the vertically oriented loop antenna …. 24 FEET FOR DIRECTOR (DIPOLE) REFLECTOR = 5 percent LONGER THAN DIRECTOR = 119. However, designing such an antenna to be an effective NVIS antenna, particularly across multiple bands, is not always an easy task. 268 -Trap Dipole Antenna for 17m,13m. Complete details of the 10-80M …. A magnetic loop antenna is electrically simple and looks like a two turn transformer with a tuning capacitor in the larger loop. It will start to act like ladder line. With the regular DX commander, the 80m element is an inverted L so you do get some nvis performance. The directions of maximum radiation stay pretty much the same as I change bands. Figure 7 – W4GO VAQP 80m 2018 Figure 8 – W4GO VAQP 80m 2019. Love the DXC for DX, and have the Lite version with 40-20-15 for portable ops. Portable HF Antenna you can build in a day. Near Vertical Incidence Sky Wave (NVIS) NVIS propagation is a propagation pattern that uses antennas with high-angle radiation (almost 90 degrees, vertical) and low operating frequencies. They are only rated at 150 watts, not 1500 watts. Indeed, being daylight, I couldn't hear a thing, just noise. (See further experimentation concerning spacing below) I f your. Antenna, Vertical, HF, 6-Band, 80, 40, 30, 20, 15, 10 meters, 1,500 W SSB, 1,000 W CW, 24 ft. Ensure it works in the Inverted V configuration. Super Antenna MP1DXTR80 HF SuperWhip Tripod All Band 80m MP1 Antenna with Clamp. HFJ-350M Toy Box Original Comet Portable 9 Band Telescopic HF Antenna - Great Option for Travel. It covers the 80 meter through 6 meter Amateur Radio bands and can handle up to 100 watts SSB, 50 watts CW, & 25 watts digital. Portable End-Fed / 80-6 Meters/Dipole…. DXE-ANTW-150 - #14 Insulated Antenna Wire, 80M & Up, 150 Ft. It is why I have decided to install an NVIS antenna for 80-meter and 40-meter. An NVIS antenna is simply a horizontally polarized at a height ranging from 1/20th to 1/4 wavelength above the ground. An SWR of 2:1 or better was obtained from 1836 kHz to 1853 kHz without the need of an antenna tuner. Good to have a packable antenna that can do 80m, and that isn't a half-football field long like a full dipole would have to be. Excellent NVIS antenna, very good for continental contacts and quite OK to work the stronger DX stations. The DXE-NVIS-8040 and DXE-NVIS-8040NM are full size, with 67 ft. The difference between the two models is the foot print size area needed. Here's an efficient and compact antenna for 160, 80, 40 and 30 or 20 meters. The Near Vertical Incident Skywave (NVIS) antenna is a half-wave dipole antenna mounted not over 1/8th wave above ground (at the highest operating …. The material in this article is derived from The ARRL …. It's enough to place the balun about 6-7 meters above the ground, although for better performance on 80m it's better to place it higher. Antenna Efficiencies Frequency, MHz cy Note: LW height-21 ft. (13-AWG) wire wound on an Amidon T-400-3 Toroid. 7: B : Buy on Amazon: 4: MFJ-1778 MFJ Enterprises Original G5RV Wire Antenna 160-10 Meters, 102 Ft Long The ruggedized compact MP1 SUPER ANTENNA, 2 METER ADAPTER, TRIPOD, UNIVERSAL MOUNT, TITANIUM SUPER-WHIP, 80 & 60 METER COILs, and GO. (80m freq, multiple stations and multiple . Each matchbox is purpose-designed for use with "this" antenna. What a great rig! A lot of radio neatly packed in a compact rugged case. Easy Installation and Operation - The Antenna is easily installable on the hard roof of vehicles, end both installation & operation does not require highly qualified radio personnel. Dual Band HF + plus 2 meters, with MC2 SuperPlexer 2 meter adapter. This allows installation of multiple antenna systems at the same time, which allows direct comparisons over time, as well as measurements ARRL Antenna Handbook 1990-2007 030000] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time) [ 11 Connected to my transceiver just on receive tuning the antenna …. Antenna is 4 by 12 foot compact transmitting loop of 2"O. I modeled a few 80m antennas…. My first contact on 80m using a homemade 80m dipole that’s running around my garden, sitting 6ft above the ground. It utilizes an internal 9:1 UnUn and a BNC female antenna connector. Our Hy Power 40-meter off center fed antenna is made with the same material as our 80-meter off center fed antenna. The optimum height for NVIS antennas is something over 1/8th wavelength, or about 30-35 feet on 75 or 80 meters. Portable wire antenna for 40 and 80 meter made with a RF Chocke. Homebrew 80m/40m NVIS Antenna Homebrew 40m-6m Vertical Antenna DK9SQ 33-ft Telescoping Fiberglass Mast Hand-Held Radios Yaesu VX-170 2m FM Transceiver A tradition of innovation There are several designs for NVIS antennas, most of which. (I use an MFJ-259 antenna analyzer. With traps and coils, you can make a shorter dipole for 80 that doesn't need much of a tuner to match. Also included, and connected to the impedance matching device pictured above is an HF slant wire for regional NVIS comms while stationary. The Wire Size can range from 16 AWG to 12 AWG. For NVIS we want maximum radiation straight up, and a vertical wire won’t provide the desired pattern. Another option is a shortened dipole using loading coils. Tuning for lowest SWR was accomplished using the cut-n-try method. An excellent DX performer and is an ideal replacement for your half size G5RV by G7FEK [ Hits: 2755 | Votes: 11 | Rating: 8 ] Switchable Antenna 80/160 meters band - A switchable antenna for 80/160 meters by IK1ZOY. Multiband Loop Antenna Projectby Gary Marbut, K7GMMand Ty Marbut, W7TYY. A 4SQ is a set of 4 verticals and a controller box. I am interested in 40m and 80m NVIS for Winter Field Day. Includes new UM2 SuperMount with NVIS SuperTilt. Near Vertical Incident Skywave (NVIS) Antennas. Magnetic antennas can be built very compact, good for limited spaces or 'mobile' use, e. wire dipole antenna legs for 80 meters and 34 ft. I've had my Buddipole for about nine months and have loved it except for one thing. Because the antenna is electrically significantly longer on 80m than on 160m, we have …. On 80m and 160m topband where the attainable - (size constrained) efficiency is diminished performance of a the small loop still generally antenna exceeds that achievable from a horizontal -wave halfdipole, particularly one deployed at suboptimal height - above ground. This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. This wire should typically be 3-4 dB down from that of a full size 1/4 wave 80 meter vertical when used with the same ground rod. The standard models are made with the use of 16-gauge insulated wire. A design by VK3JEG is only 66-ft. The antenna is resonate on both bands and does not require an antenna tuner. 80m END FED NVIS FIELD ANTENNA. The FT-891 is a fantastic compact 100 Watt radio with really great audio via headphones that is better than the 7300! I've made contacts around Europe on 40m, The Supplied wire antenna will be much better for 160 and 80m NVIS, I took the MPAS 2. "It's a brave person who can admit to using a store-bought antenna". NVIS Antennas Antenna, Short Dual Dipole, Portable, NVIS, Homebrew 80m/40m NVIS Antenna Homebrew 40m-6m Vertical Antenna DK9SQ 33 …. Having 20m on the antenna is also nice for when I'd . 80m Antenna for small gardens. 5ft) per side, and fed at the bottom corner. It is used for military and paramilitary communications, broadcasting,  especially in the tropics, and by radio amateurs. At 4 MHz (the top of the IARU Region 2 80m band) it is only down about 6 dB from …. Another aspect of antenna performance is radiation efficiency. 80m NVIS Antenna Built an 80m inverted V and based on VE3RIPs modelling stuck the apex up at 30'. The antenna described here is used by DF2BC who has limited yard space for antennas. Optimize antenna for use in a particular Amateur Radio Contest called the Virginia QSO Party. In reply to the question about stability, just put something heavy over the base. The wavelength heights from Figure 13 can be translated into any frequency where NVIS antenna performance is needed. long wire, solder two more lugs, and use a machine …. You're asking too much to get a quiet 80m attic antenna. Design for middle of the General Phone Band around3. 1 mark I guess that's 3593 "center frequency" …. A Truly Broadband, Efficient Low Band Dipole - 2 - W7ZZ and N6RY, c. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your …. 80 Meter Antenna Projects : Antenna projects for 80 meters band. The main category is Antennas for 40 meters band that is about 40 meter band antennas The Procomm PCF Series monoband antennas are tried-and-true Simple DIY Stealth Apartment Antenna for HF This is where you can shop for amateur radios, accessories, antennas, WiFi/ mobile radio antennas…. 10 watt #NVIS #antenna test on 80m. Lowell, N1LO Moxon Antenna Projects-- 17M and 20M Via KD6WD. Easy set up by 1 person in two minutes without tools. The AS-2259/GR is an NVIS (near vertical incident skywave) military antenna for short to medium range communications on the lower HF bands. Compact and Efficient Antennas for HF Radio Matt Roberts — matt-at-kk5jy-dot-net Second, if NVIS response is desired, raising the antenna to near λ / 4 will remove much of its high-angle response. 8KB; This document was uploaded by user and they confirmed that they have the …. The impedance of a half wave dipole in free space is about 70 ohms. Super Antenna MP1DXMAX Low Profile Tripod 80m-10m HF +2m VHF Portable Antenna - Big Signal in a Small Package. The OPTIMUM NVIS antenna height for 80 through 40 meters is about 30-feet!! Please note the following trends as we decrease antenna height from ~16 feet on 40 meters, or ~32 feet on 75 meters: At. The Carolina Windom Antenna. Comet Original CHA-250B HF/50 MHz (3. optimizing a NVIS antenna to work over a wide range of frequencies. 269 - Hanging Unipole Antenna for 160m, 80m. HDX & Horizon Series - Compact Centre Tower Mount HF Dipole Antenna Systems · HDX-400 Quad Element Tuned Dipole HF Antenna system - Compact Self Supporting · BX- . 85 feet 3/16 para-cord suspends antenna on each half of the dipole. Any recommendations for a limited space HF antenna so I can hit more Bands If you like my videos, please subscribe Going over how I went about constructing and fitting the G7FEK Limited Space Antenna on my small suburban lot The hf antenna …. Advantages Small size (46ft long x 24ft high) 50 ohm Coaxial Feed Multi-band operation for 80m to 10m ATU less operation possible on up to 4 primary bands (80m/40m/20m/15m). When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. Frequencies above 8MHz become less likely to be reflected and frequencies above 30MHz, have little or no reflectivity. As a first try, I would like to connect the ladder line. comment at how much stronger local signals are when others are also using NVIS antennas. A Portable NVIS Antenna is QRP-Friendly. The larger the wire, the wider the bandwidth. This type of antenna radiates most of its signal at very high angles, which is perfect for using Near Vertical Incidence Skywave (NVIS) propagation to contact stations up to about 500 miles away on the 80 meter band. legs for 40 meters and it fits into a rectangular area approximately 100 ft. The first poor performing height at about …. Portable Ham Radio Antenna Vertical antenna portable 80m - 6m band JS8Call NVIS Antenna Experiment ¦ TAPR DCC 2019 Extra …. The loop always beats the dipole by about 1 dB. 266 - Delta Loop Antenna for 17m. An end-fed wire fed against ground is a simple and popular antenna. Shop for ready-made Dipole Antennas here. The primary range is about 0-300 miles. Optimum height is about 1/4 wavelength. Order your Alpha Delta Parallel Wire Sloper Antennas from DX Engineering! Kelemen Double-Band 80M & 40M Dipoles. It is a full size antenna on 40 meters and a shortened 80 meter antenna. MEASURED DATA ANALYSIS From 1/4 wave high to 1/8th wave high, there is no difference in NVIS field strength. 14 Figure 23: Improved NVIS Performance of a HF Vertical Whip Antenna Other options for mobile HF NVIS operation include using vertically oriented loop antennas as shown in Figures 24 and 25 MILITARY TELESCOPIC MAST STV-G; CSTM TELESCOPIC MAST Series; CSTM-SA “Telescopic Mast Stand Alone Scroll down for our huge range of handy products for making your own high-performance antennas …. Posted by N6PET - Pet Natividad on Aug 6, 2015 in Research | 0 comments. Equals installation of NVIS antenna Although there is an 80M mod . So, for 80m this would be 24 m (80 feet: conveniently, …. The #1 HF Portable Vertical Antenna worldwide. The basic design consists of a simple dipole located closer to the ground than usual in order to maximize vertical propagation for NVIS operation. long wire, solder two more lugs, and use a machine screw, lock washer, and wing nut to convert it quickly for 80M use. 10 Best Indoor Ham Radio Antenna For Hf Bands In 2022. Scope of this PresentationThis presentation will do the following: Examine NVIS antenna theory. Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the range between groundwave and …. The antenna consists of a half-wave dipole driven element and a passive reflector. See physical description below. Figure 1 – Folded 40m NVIS Dipole Concept. MOBILE NVIS: 80M / 40M NVIS ANTENNA ON '93 LINCOLN. One of the most effective antennas for NVIS is a dipole positioned from. Solve Virtually Any Restricted Space Problem - 40 Meter Isotron only 22 inches x 16 inches x 15 inches! Easy, Quick, and Simple Installation; Tunes & Performs Without Radials or Antenna Tuners; Handles Up to 1000 Watts PEP This antenna is a receive antenna …. The goals of the project were to provide an optimized antenna for 40m, 80m, 20m, and all. Dual Band HF + plus 2 meters, with MC2. Extends and fans out to 4 full size quarter-wave wires (1. HFJ-350M Toy Box Original Comet Portable 9 Band Telescopic HF Antenna – Great Option for Travel. Can be adapted to work on 160 meters by adding …. I decided to experiment with Magnetic Loops SSB/CW/AM receiver for 80m using one chip SA612 phantom antenna- transceiver switcher HF 5-band MOSFET power amplifier 30 amp heavy duty power supply 20 amp TX rating of the capacitor in the YouTube comments The ML-90 Magnetic Loop Antenna is without doubt the best type of antenna for NVIS …. Admin Note: This is the third and final section of the article submitted by Keypounder. The antenna is a direct match to a 50-ohm system so there is no need for a matching network. The measurements below are for building a Extended Double Zepp Near Vertical Incident Skywave (NVIS) Antenna. We want to evaluate NVIS performance and two stations, say at Byers and in Lakewood, would hear each other on the ground wave and not know how effective either antenna was for NVIS operation. A specific example is a friend who lives about 160 miles away, with the Continental Divide between us (many mountains in the 12 to 14 thousand foot elevation). NVIS Pattern NVIS radiation pattern (ARRL). Another design by KB0ZZ is a little longer, but resonates on both 40m and 80m. For example, an 80 meter dipole cut according to the formula, hung at 80 feet and. “Part 2 of my look at the Chameleon MPAS 2. Put the antenna up just behind the house. Figure 4 - NVIS loop radiation pattern at 7. It is a T-antenna, which means a vertical radiator 10m high, and a top-spanning 30m horizontal at each end, originally built for 160m and 80m. 264 - Compact Dipole Antenna for 40m, 15m. Basically, the loading coil is operating as a trap. When I plug the characteristics of this antenna into AA5TB's Small Magnetic Loop Antenna Calculator, I get predicted efficiencies of about 78% on 40 meters, 56% on 60 meters, and 25% on 80 meters. Tim Carter, W3ATB, demonstrates how to build and install as simple 80-meter NVIS antenna. That is the principle of the Near Vertical Incidence Skywave Antenna (NVIS). Deployed as an inverted V it won't take up that much room. The ruggedized compact MP1 SUPER ANTENNA, 2 METER ADAPTER, TRIPOD, UNIVERSAL MOUNT, TITANIUM SUPER-WHIP, 80 & 60 METER COILs, and GO BAG. And made of light weight material.