QRP Labs new 5W HF PA kit for Ultimate3S QRSS/WSPR transmitter

QRP Labs new 5W HF PA kit has been released, price $20, see http://qrp-labs.com/pa . This is suitable for use with the QRP Labs Ultimate3S WSPR transmitter see http://qrp-labs.com/ultimate3/u3s and this is described in App Note AN004 see http://qrp-labs.com/appnotes .


+ Approx 16dB of gain at HF
+ IRF510 MOSFET PA stage providing 5W or more RF output from 200mW drive (varies by band)
+ Raised-cosine keying envelope generation
+ Option for standalone envelope shaping, without external microprocessor control
+ 80 x 37mm PCB, compatible with Ultimate3S transmitter kit
+ Discrete component power modulator with foldback current limiting
+ Designed for typically 12V or 13.8V operation
+ Large heatsink
+ Supports RD15HVF1 transistor substitution for VHF/UHF operation

73 Hans G0UPL

Image icon PA kit473.77 KB
Image icon Power output17.03 KB
Image icon Raised Cosine envelope shaping100.54 KB