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50 watt z match tuner
The result was a tuner that will work 10 thru 80 meters and handle up to 100 watts of RF. I originally thought that the variable capacitors that I had would handle 100 watts, but then found out that they will arc over on 80 meters at the 100 watt level. So I backed the power down to 50
post 28 Jan 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
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground