Here is a schematic of a typical 3 transistor QRP AM transceiver for 49MHz that would easily work on 50MHz. Because the RX has a super-regen detector and no isolating RF amp, QRM could be caused to nearby weak signal band users, so any tests done should consider this. Simply replace the crystal and re-peak the tuned circuits to 50MHz. I have a couple of such rigs and should retune them into the 6m band. This schematic is from the YO3DAC/VA3IUL site at www.qsl.net/va3iul .
|49MHz 3 transistor transceiver - suitable for 50MHz conversion|