IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD

Cheap 144 MHz / 28 MHz transverter

Under construction...

Cheap 144 MHz / 28 MHz transverter as found on eBay.
Designed by UR3LMZ.

Picture:

144 MHz / 28 MHz Transverter

Final grounding improvements:

144 MHz / 28 MHz Transverter PA ground improvement 144 MHz / 28 MHz Transverter PA ground improvement 144 MHz / 28 MHz Transverter PA ground improvement

TX chain performance

TX gain set to about 40 dB via trimmer.
TX idle current about 420 mA, final stage alone about 330 mA.

Gain and harmonics

TX chain gain vs input power:

144 MHz / 28 MHz Transverter TX chain gain

1 dB gain compression at about 38 dBm output.

144 MHz / 28 MHz Transverter TX chain harmonics

Intermodulation

144 MHz / 28 MHz Transverter TX chain third-order intermodulation