REGEN HAM RECEIVER VIEWED ON SDR "WATERFALL" 

TEN-TEC T1253 regenerative shortwave radio kit monitoring 80 CW amateur radio. Signals are heard on the regen receiver and viewed on the "waterfall" display of SDRPlay RSP-1A with SDR UNO software. Received signals from fan-dipole antenna coax transmission line are split 50/50 by an MFJ-1708B-SDR switch into both the SDR receiver and the REGEN receiver (3dB signal loss to both due to splitter). We are listening to the signal audio on the TEN-TEC radio and viewing BOTH the received signal and the regen receiver's oscillator signal on the SDRplay screen. To demonstrate, we tune-in hams on several different frequencies. Listen to hams in Illinois, Iowa and Wisconsin on 3.552, 3.554 and 3.560 MHz. There was also a Michigan station on 3.560 but I moved the regen receiver off that frequency before he transmitted so you can only see a trace of his signal on the waterfall. Multiple signals can be viewed simultaneously, and with the regen receiver's wide bandwidth a few signals can be heard at the same time. The difference between the regen radio oscillator signal and the received signal equals the audio frequency pitch in our ears.
73 Lynn NG9D