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HF Automatic tuner
The atu is composed essentially of relays commanding inductors and capacitors
post 12 Oct 2024
Antenna Transmatch tuner Links →
The simple Z mactch tunner simplified
Simple design which has been fine tuned to match a wide range of antenna impedance conditions
Qrp-antenna-tuner kit
antenna tune tuner diy kit 1-30mhz
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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Simple design which has been fine tuned to match a wide range of antenna impedance conditions
antenna tune tuner diy kit 1-30mhz
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
Charlie's Z-match ideas below have been implemented in my station as my compact portable antenna tuner
AT-3K only has a switch position for balance line BAL to feed to an external balun
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free