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Antenna tuning
The antenna coupler matches the impedance of a 15-, 25-, 28-, or 35-foot whip antenna to a 50-ohm transmission line, at any frequency in the 2-to 30-MHz range
post 24 Jul 2024
Antenna Transmatch tuner Links →
5 Impedance Matching
The input impedance of an antenna system can be assigned either notionally, or using a Match Meter or measuring bridge
50 watt z match tuner
A tuner that will work 10 thru 80 meters and handle up to 100 watts of RF
A single coil z match
This ATU being balanced can accomodate balanced line, open wire feeder or 300 ohm slotted
75 mt antenna Tuner
A homebrew z-match
i used a t-200-6 core. the type-6 core over the type-2 because it provides a higher q over most of the hf range
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The input impedance of an antenna system can be assigned either notionally, or using a Match Meter or measuring bridge
A tuner that will work 10 thru 80 meters and handle up to 100 watts of RF
This ATU being balanced can accomodate balanced line, open wire feeder or 300 ohm slotted
i used a t-200-6 core. the type-6 core over the type-2 because it provides a higher q over most of the hf range
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