HF Automatic tuner
- The atu is composed essentially of relays commanding inductors and capacitors
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post 06 Oct 2026
Antenna Transmatch tuner Links →
The super tee qrp Antenna Tuner
The MFJ tuner with the motor drive attached
The Z-Match Antenna Tuner
The Dentron AT-3K Antenna Tuner
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The super tee qrp Antenna Tuner- The SWR bridge reads the reflected voltage, and thus it must be tuned for a minimum light output from the LED
The MFJ tuner with the motor drive attached- This project uses some small gearmotors purchased from Hobby Engineering to drive the inductor switch and the two air variable capacitors on an MFJ 1500W antenna tuner
The Z-Match Antenna Tuner- Charlie's Z-match ideas below have been implemented in my station as my compact portable antenna tuner
The Dentron AT-3K Antenna Tuner- AT-3K only has a switch position for balance line BAL to feed to an external balun
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