QRP transceiver LZ1DPN-CW2 for 3.5, 5, 7, 10 and 14 MHz CW operation. This transceiver is based on Small Wonder Labs SW 30/40 schematics. I also use parts from my other projects - EK1A homebrew copy LZ1DPN-CW1, with some changes in schematics and source code.
This is 5W QRP transceiver. Receiver work on all HF BANDS, but transmitter have band limitation from LPF and driver transistor BD139. RF amplifier from IRF510 is tested and worked well to 10W RF Power (on 10 and 7 MHz), but need more cooling, and power consumption is slightly high. Now transmitter is optimized and locked to 14MHz with ~4-5W CEP RF power.
My temporary best DX QSO record with this transceiver on 7 MHz (my QTH locator is KN32SN) is: with EF8U - 4161km. EA8BMG - 4161km (Gran Canaria Isle), EF0F, EF5T, EA5WU, EA1RKV - 2696km, EC5CR - 2695km (Spain), MD0CCE - 2667km (Isle of Man), R70SRC - 2634km (Russia).
My last contest with this QRP transceiver from locator KN32SN:
"His Majesty The King of Spain CW Contest 2017"
https://concursos.ure.es/en/contests-search/?qrz=lz1dpn
Homebrew copies of Small Wonder Labs SW20, and EK1A in my shack.
LZAFA ACTIVITY WITH THIS QRP - Summer 2017
SOME OLD PICTURES:
73 ES MNI DX'es!LZ7DP
