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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: 481 | Rating: 0 | Votes: 0 | Added: 1-Nov-2004 07:00 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: 1126 | Rating: 0 | Votes: 0 | Added: 1-Nov-2004 13:01 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: 534 | Rating: 0 | Votes: 0 | Added: 7-Dec-2005 09:01 GMT | |
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LDG Electronics Inc
LDG produces coax switches, watt meters, baluns, and tuners.
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| | Hits: 732 | Rating: 0 | Votes: 0 | Added: 8-Dec-2004 13:01 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: 357 | Rating: 1 | Votes: 1 | Added: 1-Nov-2004 05:01 GMT | |
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MFJ Enterprises
MFJ Headphones, tuners, tncs, ...
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| | Hits: 521 | Rating: 0 | Votes: 0 | Added: 8-Dec-2004 11:01 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: 541 | Rating: 0 | Votes: 0 | Added: 8-Dec-2004 07:01 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: 417 | Rating: 0 | Votes: 0 | Added: 1-Nov-2004 08:01 GMT | |
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Palomar Engineers
Palomar offers RFI Kits, baluns, loop rx antennas and the tuner-tuner.
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| | Hits: 507 | Rating: 0 | Votes: 0 | Added: 8-Dec-2004 15:00 GMT | |
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