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  • j-pole antenna super j-pole antenna cubic quad antenna arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions
  • Helix Antenna. The Quadrifilar Helix Antenna (QHA) is a simple and inexpensive solution to the problem of non-geosynchronous satellite research. This antenna is unique in its simplicity of design and powerful performance compared with standard directional receivers. Once relatively anonymous, this incredible tool has gained
Double helix definition is - a helix or spiral consisting of two strands in the surface of a cylinder that coil around its axis; especially : the structural arrangement of DNA in space that consists of paired polynucleotide strands stabilized by cross-links between purine and pyrimidine bases.
6m/2m/70cm Yagi Antenna (Part 1/9) Built from Old TV Antenna How to build a ham radio tri-band 6 meter, 2 meter & 70 cm yagi beam antenna using an old TV antenna for parts. A simple design using dipole driven elements....
where H is the antenna height above the ground in feet and D is the distance to horizon in miles. You then have to double this distance so that both antennas see the horizon. So with antenna height of 7 meters (approximately 22 feet) this gives \$ 1.2 \sqrt{22} = 1.2 * 4.7 = 5.6\mbox{ miles} \$ Double this to give 11.2 miles.
HF Ham Radio Antennas For Apartments . by AG4DG . The Issues . A full-size antenna for HF (except for the 10m band) is not feasible for apartments due to the space required. An apartment antenna should have the following characteristics: Compact Size: This is the most obvious requirement of apartment antennas.
SUPERIOR: 6M / 2M / 70 CM FREQUENCY : 52 / 146 / 445 MHz 1/4 Wave 2.15 dbi / 1/2 Wave 5.5 dbi / 5/8 Wave dbi x 2 / 5.5 dbi VSWR: 2.0 / 50 Watts NMO Connection, Length: 39.4"
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Dualband Mobile Antenna 2m/70cm VHF/UHF Ham Radio, 137-149, 437-480 Mhz, Magnet Base PL-259 Connector, 10 Ft RG58 Cable. 4.4 out of 5 stars 303. $21.99 $ 21. 99. Get it as soon as Wed, Jan 6. FREE Shipping on orders over $25 shipped by Amazon.
Helical antenna is an example of wire antenna and itself forms the shape of a helix. This is a broadband VHF and UHF antenna. Frequency Range. The frequency range of operation of helical antenna is around 30MHz to 3GHz.
The GPS/GNSS/Iridium antenna is a folded Quadrifilar Helix Antenna (QHA) with novel features which improve frequency coverage compared to existing QHA designs. This QHA antenna is co-located concentrically (co-axially) around a UHF monopole which increases the gain of the monopole by several dB over most of the UHF 225 – 512
Helical Antenna (helix) for FM Radio: This helical antenna worked amazingly well for a poor FM radio. I was receiving only 13 channels according to auto-preset function. This adjustment resulted in 27 presets, more than double the number of channels received in clear stereo. Quick upda…
Jul 28, 2017 · The Basics Of Quadrifilar Helix Antennas The Basics of Quadrifilar Helix Antennas technical article. 2 www.orbanmicrowave.com introduction F rom its almost accidental origins, the axial mode helix antenna has gone from a young professor’s laboratory curiosity to one of the most widely used antennas for UHF and microwave communications ... This calculator is designed to give the vertical length (height) of a particular whip type antenna, or the frequency of it. Enter one (only one) value, the desired frequency or the antenna length in any length field. Click on Calculate and the opposite value will be displayed in feet and inches or frequency in megahertz (Mhz).
It is a compact Quadrifilar Helix Antenna (8 cm/3" OD x 16 cm/6" H) designed to receive Amateur Radio satellite signals, without requiring an antenna rotator. This 70 cm band QFHA incorporates a 15 dB Low Noise Amplifier (LNA) near the antenna's feedpoint, providing for a low overall receiving system Noise Figure (and sensitivity).
This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen. Enter the desired frequency then click on Calculate and the optimum values for that combination will be displayed in feet, inches and fractions of inches, and in meters.
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  • Dec 11, 2016 · Your speaker wire antenna is an example of how simple antennas can be. Radio technology has made huge advancements but the basic physics of antennas is the same as always. By the way, for my other readers, Jeff is a well known amateur radio writer and personality.
    Helix Antenna. The Quadrifilar Helix Antenna (QHA) is a simple and inexpensive solution to the problem of non-geosynchronous satellite research. This antenna is unique in its simplicity of design and powerful performance compared with standard directional receivers. Once relatively anonymous, this incredible tool has gained
  • Vertical Antenna 5/8 Lambda for 70- cm Band : Credit Line: Forum from: www.cqham.ru : By: Antonhax . At first the antenna was modeled by copper wire. Then the antenna was made on the base of bicycle wheel spokes. Figure 1 shows design of the antenna. Inductor of the antenna is wound on a form in 8- mm diameter.
    The SWR minimum of the 2 m QHA was close enough according to my antenna analyzer, and the impedance was quite close to 50 ohms. My analyzer of the time didn't go to UHF, but the radio was happy enough with the antenna. What was a surprise to me, was how well the 2 m QHA was matched also at 70 cm.

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  • Dipole Antenna: A dipole antenna is the simplest type of radio antenna, consisting of a conductive wire rod that is half the length of the maximum wavelength the antenna is to generate. This wire rod is split in the middle, and the two sections are separated by an insulator. Each rod is connected to a coaxial cable at the end closest to the ...
    Vern’s antennas: Top 2 x 26 element loop yagis for 23 cm fed via two lengths of surplus 75 ohm Helical Membrane hard-line and combined within his shack. Two metre and 6 m antennas with a 70 cm curved reflector on the back of his tower. Vern had to remember to rotate his antennas by 180° when on this band.
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 I have a number of other antenna experiment/projects in various configurations, in particular 2 m and 70 cm yagi and/or helical beam antennas suitable for satellite and moon bounce communication. But these are for the future.
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 Apr 29, 2015 · This Helical Bandpass filter has very low loss. About minus 0.3 dB for the 5 MHz bandwidth and minus 3 dB for 8 MHz bandwidth. You can use it for improving the receiver front-end by reject out-of-band unwanted strong signals which can make interference and block your receiver, making incapable to receive weak signal of interest. Jan 01, 2016 · Comparison between radiation patterns of quadrifilar helical antennas with three shapes of cylindrical, conical and inverted conical is provided in this paper. Multi-folded printed lines are used as the arms of quadrifilar helical antennas and the heights of them with their supports are fixed at 35 cm to make a valid comparison.
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 Humminbird HELIX 10 Fishfinders For customers with special needs, we have provided a customer support phone number reachable 24 hours a day, 7 days a week, 365 days a year: (800) 720-6364. FAQ My Order Status Log In / Register My Account
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 ARRL Product Review of the M2 6-Meter HO Loop Antennas. Reviewed by Bob Allison, WB1GCMAssistant Laboratory [email protected] The … K6MYC on Antenna Testing. Some TIPS on measuring VSWR and troubleshooting M2 … Antenna Gain: dBi vs. dBd. Antenna gain is measured in either dBi or dBd.It is important to note that …Jul 03, 2012 · I painted my 2 meter slim jim antenna with Grey kry lon primer 9 months ago when I put it up. No swr problems. Less than 1.1-1 across the band and less than 1.3-1 on 70cm with no special uhf elements.
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 Oct 02, 1996 · Gain: 15.9 dBci (approximately 1 to 1.5 dB better than the standard Helix antennas I have modeled) Pattern: First Side lobes at 36 degrees down 14 dB Average of all remaining sidelobes 25 dB Bandwidth: 0.2 dB variability from 432 to 438 Mhz 50 Ohm Match at 1.2 VSWR from 432 to 438 Mhz About 70 cm helix antenna The resource is currently listed in dxzone.com in 3 categories. The main category is Antennas projects for 432-440 MHz that is about Antenna for 70 cm 432-440 MHz. This link is listed in our web site directory since Friday Oct 8 2010, and till today " 70 cm helix antenna " has been followed for a total of 10164 times.
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 Humminbird HELIX 10 Fishfinders For customers with special needs, we have provided a customer support phone number reachable 24 hours a day, 7 days a week, 365 days a year: (800) 720-6364. FAQ My Order Status Log In / Register My Account HF Ham Radio Antennas For Apartments . by AG4DG . The Issues . A full-size antenna for HF (except for the 10m band) is not feasible for apartments due to the space required. An apartment antenna should have the following characteristics: Compact Size: This is the most obvious requirement of apartment antennas.
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 Its only a 2 meter antenna, but with a little inventiveness it can be turned into a VHF/UHF antenna. Satcomms with the new CubeSats will cover both the 2M and 70cm bands at (435.180 uplink CTCSS 67Hz and 145.980 downlink). There's a nice paper on Tape Measure Yagi's here that will help in yagi design. A tape measure style is great for ... Dec 27, 2016 · Back to antenna issues, you can get a single antenna that is designed to work on both 2m and 70cm, and you can even get tri-band antennas that will work reasonably well on 1.25m too. This is normally the most convenient approach to adopt.
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 Keep in mind the helical is a single band antenna as well. On 70cm the SMA-24 performs very well but so does the Icom stock duck antenna, with only marginally worse performance I don’t see much of a reason to bring anything else with me if I’m going to be operating 70cm.
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 The VHF band is isolated by 70 dB from. An antenna is an antenna to most people. The antenna breaks down to no more than 36 in. ICOM IC-705 US VERSION HF/50/144/440 MHZ MULTIMODE PORTABLE TRANSCEIVER Price: USD 1,246. Base Antenna Yagi Antenna. needs a little clean up but otherwise fine condition.
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    I have a number of other antenna experiment/projects in various configurations, in particular 2 m and 70 cm yagi and/or helical beam antennas suitable for satellite and moon bounce communication. But these are for the future. I also want to build some highly directional antennas for radio orienteering and high-gain narrow-beam antennas for ...After using a 12 x 12 el. crossed Yagi on 2m. for a year or so for satellite work, mainly AO-13, AO-10, UO-22 and KO-25. I decided to construct a helix to make some comparisons. At this stage I suggest that you read my article on "A Satellite Tracking Antenna" to get an idea on…
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    KRA-26M VHF Helical Antenna 136-174 MHz for Kenwood TK-5220 TK-5210 TK-2207 TK-2200 TK-2170 TK-2160 TK-2000E TK-280 TK-272G TK-190 Two Way Radio (Pack of 5) 3.3 out of 5 stars 3. $16.29 $ 16. 29. Get it as soon as Wed, Dec 30. FREE Shipping on orders over $25 shipped by Amazon.Jul 22, 2009 · 7. Following the pass with the antenna You will trace the path of the satellite orbit with the antenna using the Heavens-Above pass chart as a guide. At the Start Time, start with the antenna perpendicular to the Az. direction at the given Alt. For example, at 7:28, aim the antenna perpendicular to north at 10 degrees above the horizon.
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    Helix antenna pattern. The radiation gain pattern is assumed to be around the axis of the Helix. Currently, it is calculated up to 90 degrees from the axis. Radiation gain toward the back direction (i.e. more than 90 degrees from the axis) is not calculated. Note: The default helix antenna values are good for S-band frequencies (1.0-2.5 GHz ...
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    You can get polarization naturally, with a helical antenna. Otherwise, you can make a rotating field by setting up a 2 phase electrical motor.The first phase is the regular signal and the second phase is obtained with a 1/4 wavelength delay line (90 degree phase shift), applied to a second radiator, set at 90 degrees to the first one. Aug 11, 2019 · • G4DDK 10M to 70cm transverter (GPS 101MHz) • SG-Labs 70cm to 13cm transverter (GPS 10MHz) • Leo Bodnar GPSDO-mini (101MHz) • PE1RKI 100W power amplifier (@3W o/p) • Single 1.2M offset dish + dual band feed
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  • Dec 21, 2019 · Center-feeding a wire antenna is a big advantage, because it can be forced to work on (nearly) any frequency. Even though the antenna is resonant in the 40 meter band (7.0 - 7.1 MHz), the 80 meter band (3.5-3.8 MHz) can be covered using an antenna tuner.