Jay
Good point!
Any thoughts on where in the rf input => demodulated audio chain the DR-limitation is in the R-4C?
My R-4C came with most of the Sherwood mods... but those won't have any impact on the signal at the 50kHz i.f. [I did notice that the stock AM demodulator (per the schematic and the actual performance) in the R-4C is really poorly designed. The top end started to roll off at around 1500 Hz, and the bottom end started to roll off at around 1000 Hz (
) I had to increase the value of the AM envelope detector's output DC-blocking capacitor to open up the bottom end, and I had to add a resistor in parallel with the capacitor in the AM envelope detector in the to open up the top end. It sounds much better (when I use it) now]
Separate question...
Can I change the total number of samples used to calculate each sweep of the spectral display in Power SDR? With a 192 ksps sampling rate, I need 4x as many samples in each FFT computation in order to keep the same spectral display resolution.
Best regards
Stu