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Category: Ham Radio: Tuners
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Description: Antenna tuners match a radio's impedance to a load. Most ham radio transceivers use a 50 ohm impedance to the transmission line (for example, coaxial cable). However, the impedance presented to the radio by the load (transmission line and antenna itself) can vary. The mismatch in impedance is often caused by operating at a frequency that is not resonant for the load. For example, if trying to operate at 7.1 MHz with an antenna which has a 8.0 MHz resonant frequency. The antenna tuner (or ATU) allows ham radio operators to use an antenna across a broader range of frequencies by matching the source (transceiver) to the load.
Antenna tuners vary in design, complexity and features - from very simple circuits which add capacitance and inductance to create a 50 ohm resistive impedance match to more complicated matching networks that are automated and can find a 1.0:1 SWR match within seconds.
PI networks, SPC (series parallel capacitor) and autotransformer ATUs are common in ham radio. |
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Estimating T-network losses at 80 and 160 meters
Estimating T-network losses at 80 and 160 meters.
Originally published in QEX, this article discusses low band issues with the t-network, popular at many ham radio stations today.
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| | Hits: 489 | Rating: 0 | Votes: 0 | Added: 26-Oct-2005 14:27 GMT | |
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G5RV, FD4: Multiband Wire Antennas and ATUs
FD4, G5RV and Automatic Antenna Tuners. Multiband ham radio antennas have compromises that should be considered. This page addresses some of these compromises with regard to the FD4, G5RV and automatic antenna tuners.
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| | Hits: 507 | Rating: 9 | Votes: 2 | Added: 17-Apr-2007 15:12 GMT | |
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Ham-Kits.com
Ham-kits offers ham radio tuner interface kits for (Icom, Alinco, Kenwood), a sealed lead acid battery charger kit, a data (soundcard to ham radio) interface kit and other projects.
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| | Hits: 821 | Rating: 0 | Votes: 0 | Added: 9-Nov-2005 03:07 GMT | |
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Hamware.de Antenna Tuner and Switches
Hamware.de offers antenna tuners (including a 1500W automatic antenna tuner) and switches from Germany.
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| | Hits: 455 | Rating: 0 | Votes: 0 | Added: 5-Jul-2006 03:20 GMT | |
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LDG Electronics Inc
LDG produces coax switches, watt meters, baluns, and tuners.
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| | Hits: 479 | Rating: 0 | Votes: 0 | Added: 9-Aug-2005 03:41 GMT | |
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MAXX-COM
MAXX-COM - solid state antenna tuners (couplers) for ham radio and commercial use. Many question whether these things work or not and the MAXX-COM design - so buyer, beware!
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| | Hits: 209 | Rating: 5.5 | Votes: 2 | Added: 25-Oct-2005 02:08 GMT | |
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MFJ Enterprises
MFJ Headphones, tuners, tncs, ...
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| | Hits: 481 | Rating: 0 | Votes: 0 | Added: 7-Aug-2005 00:12 GMT | |
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Miracle Antenna
Miracle Antenna produces the Miracle Whip (up to 25 W), Miracle Ducker, and Bandito QRP antennas.
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| | Hits: 532 | Rating: 0 | Votes: 0 | Added: 3-Aug-2005 02:16 GMT | |
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N2VZ Turbo Tuner
N2VZ Enterprises. Turbo Tuner Fully automatic screwdriver antenna controller for: Kenwood & Icom radios.
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| | Hits: 334 | Rating: 0 | Votes: 0 | Added: 4-Nov-2005 02:15 GMT | |
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