Feb 26, 1999 · One (additional) rod antenna (or metal wire 2 cm shorter than the radio antenna) (B). One non-conductive, dry board (C) big enough to fit the radio and metal sheets (about 30cm x 60cm) plywood or ...
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Aug 07, 2012 · The third antenna will probably be a multiband version of these antennas (or yagi). This is the third antenna.. Below a small description of an easy to make and cheap multiband wire vertical. The antenna has like the fan dipole parallel wires for the bands for the bands it has to work on.
Aug 23, 2017 · After considerable time buying, shipping, and collecting equipment, I’ve finally installed a 23 cm 10-turn helix antenna and preamp. This should help with this weekend’s ARRL 222 MHz and Up Contest. Wimo Helix 23 The antenna is the Wimo Helix 23 that covers 1250 to 1300 MHz. It’s right hand circular polarization. I figure it […]
Over the past year I have experimented with a great many antenna designs and have found the G7FEK built with home brew 'ladder' vertical section with 2 inch spacing has had the most success so far. I am fortunate to have very good ground (high ironstone content) QTH is 700ft AMSL with clear take off from East through North to West.
Jun 20, 2011 · The coax will be about 23 cm in total resulting in 22pF. Now remove the resistor and connect the antenna wire of aprox. 10 m. PVC coated copper wire. Tune the antenna for best VSWR by reducing it's length carefully.
antenna and securely inside the hut. Coaxial Collinear Antenna In 1986 Peter Williams ZL2ARW had made a design to work on the first Wellington 23 cm repeater 1271.2 MHz. This was based on the CQ Ham Journal Summer 1981 “ MHz Collinear ” This antenna worked well for many years in a harsh environment.
Apr 2, 2018 - Homebrew Multiband Vertical HF Antenna Pin My Homebrew Vertical Multiband Hf Antenna On3jt on Pinterest 450 x 600 · 80 kB · jpeg 40 Meter Vertical Antenna Homebrew multi band ham radio... Ultra-Lightweight antennas for expeditions and stealth applications. OpenWire-Fed. Antennas - - - - TUNER BALUNS. Home-Brew D-i-Y. Tuner Balun
Sep 15, 2002 · The 10-80 meter groundplane vertical antenna is a rugged multiband vertical antenna, That is 43 feet in height. This vertical antenna has no lossy traps or coils to burn out.Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for.
Mar 05, 2017 · My vertical T antenna cost me 55 euro's, the main part for the fiberglass sticks of 4 feet length which can be inserted into each other and i used 9 of them, added the remnants of a fiberglass section of a broken X 510 to reach the 14 meter hight.
A Hybrid Quad Directional Antenna for 23 cm. ... 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF ... Home-brew Compact 6dBi Collinear Antenna.
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Mar 18, 2019 · 700 amateur radio topics - 6,000 links & 133 pages - from antennas to zones NOTE: AC6V.com is an archive of Rod/AC6V's webpages, and is no longer being updated. How To Obtain A Ham License I had a dipole up for 4m previously (see here), which worked fine, but was quite ugly on a 1 metre boom arm. I wanted to make something simple that would be reliable and not require a balun or any impedance transforming, so I decided to build a quarter wave ground plane antenna for home.
Ultra-Lightweight antennas for expeditions and stealth applications. OpenWire-Fed. Antennas - - - - TUNER BALUNS. Home-Brew D-i-Y. Tuner Balun
THE 5/8 WAVE VERTICAL . This type used by many, It has deserved a name on the DX-antenna list over the last years. Often bought by those who have a 1/2 wave vertical but want to put more effort in the antenna system. The radiation pattern is also a omni-directional one.
A crude estimate of the ground connection resistance for a vertical antenna may be obtained from the following examples assuming ordinary garden/pastoral soil with a typical resistivity of 100 ohm-metres,: Sixteen buried radial wires, 10-metres long, 2-mm dia, 100-mm depth: 4 ohms; One, 10-metre long radial wire, 2-mm dia, 100-mm depth: 20 ohms
Jerry, K5OE: Home Brew Amateur Antennas . Eggbeater II Omni LEO Antennas. Presented here is a high-performance, circularly polarized omni-directional antenna that is easy to build, easy to tune, inexpensive, and will work all the mode J Low Earth Orbit (LEO) satellites.
2 days ago · The next antenna built was a so called Fan Dipole antenna. 5 Wires parallel for each band, fed by a balun at the common center. I started with 10cm between each dipole. But the interaction between each element made it also difficult to tune. I figured out that I needed at least 15 cm between each element, the more the better.
Construct a vertical ground plane with one vertical element, and two radial elements, from readily available parts. 1 EX-Engineering DXE-MMP-P2 polymer plastic 25 in. x 7.5 in. x 11.5 in. element to boom plate 2 DX-Engineering DXE-SAD-075A 3/4 inch saddle clamps 4 DX-Engineering DXE-CAVS-2P 1.5 inch saddle clamps 2 DX-Engineering DXE-CAVS-2P
**4S7AB now active from 160m to 6m, 2m/70cm and Satllites including QO-100. Every QSO and the OP behind is equally important to me issespective of band mode or your QTH** Other Callsigns owns and used over the years. KA5MAL (USA Extra class vanity call valid from 2003) 8Q7ED (Maldives valid from 2006) LA/4S7AB(Norway 1999 -2000)
Sep 04, 2012 · The next antenna were the so called Cloverleaf, or Big Wheel antenna. It was very attractive, but somewhat large for me. This antenna would be the chosen one for the 70cm band. Another option was the Egg beater antenna, or the K5OE's variant Texas Potato Masher. This antenna is used heavily on satellite work.
Antennas (Mini), Cushcraft AR-10 Mod, CQ 1990, Jan pg 103 Antennas (Mini), Cushcraft R5 No-Ground Radial Vertical, CQ 1990, Apr pg 38 Antennas (Mini), Cushcraft Ten-3 10 Meter Yagi, CQ 1990, Feb pg 38 Antennas (Mini), End-Fed Antennas & More on Attic Antennas (Thurber W8FX), CQ 1991, Sept pg 85 Antennas (Mini), Ham 10 Antenna, CQ 1990, Feb pg 57
4. H = H plane (Vertical) stacking in Meters. 5. Ga = Gain in dBi of a 4 bay array : 6. Tlos = The internal resistance of the antenna in degrees Kelvin. 7. Ta = The total temperature of the antenna or array in degrees Kelvin. This : includes all the side lobes, rear lobes and internal resistance of the
The star base with folding mast allows you to easily maneuver vertical antennas or V-shaped dipoles with minimal effort.It is particularly useful on terraces or land, where there are no other anchor points.Leg length = 1mTotal height = 1.7m approximatelyMast diameter = 48x3mmMaterial: Hot-dip galvanized steel, stainless steel nuts and bolts.
Here's a simple Saturday project: build a portable VHF yagi antenna for 2 meters. All you need is two rabbit ear antennas from Radio Shack, two CATV baluns, four feet of 3/4" CPVC pipe with one tee, and a bit of time. This sketch shows a semi-exploded view of the antenna. Prepare the antenna's boom from two pieces of 3/4" CPVC plastic plumbing ...
Petlowany Three-Band Burner Antenna — Trapless short vertical antenna – Resonant on 20, 15 and 10 meters, without traps, 12 and 17M with a tuner. From David, N5IZU Phasing Arrays – Vertical Antennas — From Butternut Portable Antennas — From The Ham Club At University of Hawaii at Manoa
The Comet CHA-250B is a newly designed broadband vertical requiring NO GROUND RADIALS. This antenna is EXTREMELY easy to assemble, requires no tuning or adjustments and VSWR is under 1.6:1 continuously from 3.5MHz – 57MHz! It is not a 1/4 wave vertical, but an end-fed long wire type antenna with a matching transformer in a vertical position.
A helical antenna is an antenna consisting of one or more conducting wires wound in the form of a helix.A helical antenna made of one helical wire, the most common type, is called monofilar, while antennas with two or four wires in a helix are called bifilar, or quadrifilar, respectively.
Jan 23, 2017 · I was given a 1W HT for 23 cm (Yaesu FT-911), so I’ve been looking at simple gain antennas, especially for mountaintop use. There are some yagi antennas under $50. Some drones use that band, so they are available from those suppliers. They may be tuned a little below the ham band, but they look pretty convenient for backpacking and SOTA.
Phasing short hf vertical antennas, W8OG: Simple Vertical Antenna Theory, WC7I: Stilo portatile per i 18 Mhz: The 5 band pipe vertical That's 20, 17, 15, 12 and 10 meters!, KL7JR: The portable random wire vertical: Utilisation d'un pylône autoportant en antenne verticale: Una antena hibrida de 3,5- 7 Mhz que ocupa poco espacio: Vertical 75/80 m
Antenna: A total of 12 meters of wire, with a diameter of about 2 mm, divided into four sections. Insulators cn be of porcelain or PVC. To fasten the antenna one can use , thread of clothes for the anchorage. L1/L2: Two tubes of PVC of 5 cm (2 inches) of diameter and approximately 20 cm of longitude. Roll 60 turns of wire of 1.5 mm on each tube ...
I was playing around with the MMANA Antenna analysis software and wanted to design a 2m/70cm vertical antenna. I tried different antenna models, J-pole, half wave dipoles, Ground Planes …. I then remembered a chapter in the 18. edition of the ARRL Antenna Handbook covering Open Sleeve antennas to make Broad band antennas.
I had a dipole up for 4m previously (see here), which worked fine, but was quite ugly on a 1 metre boom arm. I wanted to make something simple that would be reliable and not require a balun or any impedance transforming, so I decided to build a quarter wave ground plane antenna for home.
With the Beam I was easily able to make the trip using only 50 milliwatts. The antenna seems to load up ok on the 70cm band, but the predicted pattern is really awful. The design impedance is 75 ohms, but I am feeding the antenna directly with 50 ohm coax, the measured SWR is: 1.3:1 @ 144Mhz 1.3:1 @ 145Mhz 2.0:1 @ 146Mhz 2.7:1 @ 147Mhz 2.5:1 ...
May 31, 2010 · I've finished yet one more version of my Crappie Pole antenna, this one based on KF2YN's ground independent vertical antenna (or C-Pole). See here and April 2004 QST, page 37, for more information. After trimming it a little it measures 1:1 at 14.060 MHz rising to 2.5:1 at 14.35MHz and 1.2:1 at 14.0MHz.
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Mar 05, 2020 · An optional 1/4-20 to 3/8 adapter for use with 3/8 antenna mounts is available. Assembled the PAC-12 is approximately 8.5 feet long Breaks down and packs in 14 inches or less of space.
43 Foot Vertical Antenna
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Primarily a dipole, the J-pole antenna exhibits a mostly circular pattern in the H plane with an average free-space gain near 2.2 dBi (0.1 dBd). Measurements and simulation confirm the quarter-wave stub modifies the circular H-plane pattern shape increasing the gain slightly on the side of the J stub element and reducing the gain slightly on the side opposite the J stub element.
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