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2 traps in just one 'can' is the technique e.g. Mosley and Fritzel (Germany) have implemented in order to cover 3 bands. There are 2 traps needed per side in order to make a 3-band antenna. Others, e.g. Cushcraft, Hygain, have implemented a one trap in one can
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You can also use these traps to design HF vertical multi-band antennas using either wire or aluminum tubing. Traps for different bands can be combined onto one dipole to create a single antenna tuned for maximum gain on all your favorite bands, from 160 to 10. Purchase price includes two units. (Set of 2 traps) Traps can be added to make it multiband Fan Dipole Nominal 50 ohm impedance Gain increases with height (true for all antennas) Formula for calculating dipole length 468/F (MHz) I was so impressed I then added the second trap for 3.5 MHz, this set up along with my AT-200Pro Autotuner works very well and covers 10m up to 160m. Needless to say that this is my main shack antenna for HF.
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DIAMOND CP-6 VERTICAL HF ANTENNA ALL BAND HF ANTENNA. £158.00. 15 bids. £20.25 postage. ... 10m Trap for Inverted-L or vertical antenna. £18.50. Click & Collect. - The antenna is capacitive on 3.8 MHz and inductive on 7.2 MHz - The reactance should not be too high on both bands, to improve matching efficiency - A remote tuner will easily match this antenna from 3.5 to 7.5 MHz 3 radials ~27 ft. 1 pi. VERTICAL 3.8 & 7.2 MHz EARTH EARTH 3 conductors #14, spaced 120 deg. 16.39 ft. (16’ft. 4¾ in.) long.
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Value: With a B-Square Engineering Terminated Folded Dipole, it is possible to work all the HF bands with one antenna, one feed-line and one installation without the expense of a tuner. 5. Forgiving of Real World Issues: Not only will the Terminated Folded Dipole continue at low installation heights, it is less effected by nearby obstacles than ...
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HF Antennas Especially stealth models for those in an HOA By Dave Land KD5FX . Dipole . Dipole Easy and cheap to build, can be made with small gauge wire For stealth applications (suggest 18ga black wire from Frys) Single band antenna when fed by coax15 portable HF wire antennas to try. The urban antenna forage NEW! HF from a wire along the ground NEW! Experiences with kite-supported wire antennas. The 'Shoddytenna' 160m vertical for portable use. Using sports oval light poles as an antenna on 160 metres NEW! 160 & 80m coax loop antenna and coupler NEW! Roll up coax cable 40 - 20 metre ...
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HF MULTI-BAND WIRE DIPOLE (TRAP DIPOLE) ANTENNAS. W-SERIES. The W-Series antennas are very easy to assemble. And, low stretch ratio, rugged and weather proof 3.5 square plastic coatea stranded wire is employed for element material. Adjustment element is provided for each band to adjust each band without affecting rest of the bands.
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KL7JR END FED ANTENNA. Using CB Antennas on 10 Meters! By N4UJW. W6HDG FAN DIPOLE ON A FENCE! A quick and easy hf multibander! THE MAYPOLE ANTENNA. Build a multiband HF antenna using multiple dipoles and single coax feed. END FED 80 > 15 METER QRP ANTENNA by K0DTQ (Use it without a tuner!!) NA4L LAZY H ARRAY DIPOLE /INVERTED V MULTIBAND HF DIPOLE HF in the HF Antenna stands for the high-frequency. The radio antenna that can receive and transmit the signals between 3-30 MHz are known as the HF antenna. They are very useful in radio communication or even the TV signal reception. How does Multiband Antenna Work?
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On the 20 m band for example, a vertical of 6 m high like the Fritzel GPA 404 displayed below (that uses 2 trap coils too) must be completed with a 5.2 m long radial, to give a vertical cut at 1/2l; this is mandatory to create its mirror-image and be able to work on its harmonics and thus on several HF bands. • A 3-band trap dipole fits in less space than a fan dipole – 20/15/10 is about 26-27 ft (20M dipole = 33 ft) • Traps add some loss – Typically 1-2 dB – A lossy antenna is better than no antenna • Traps reduce the SWR bandwidth – Trim lengths carefully and use a tuner!
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You can further reduce the height of the antenna by placing a capacitance "hat" at the top. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator .) If you would rather calculate the length of a full-size vertical antenna, see The Quarter-Wave Vertical Antenna Calculator .
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Well the R7 Cushcraft antenna is NOT your Fathers quarter wave vertical --it is a half wave end fed antenna thus it needs no radials. It is fed at a high impedance point by virtue of the matching black box at the antenna feedpoint. In fact the addition of radials will really screw it up --- read the manual see URL:
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