Once you have a receiver whose gain can be set precisely, feed the audio
output into an FFT spectrum display (not a waterfall plot) and that will
give you the carrier amplitude - you should be able to accurately
determine signal level for any narrow signal whether on/off keyed or
whatever. For BPSK the energy falls in a defined bandwidth so once
again easily seen on a spectrum display. Spectrogram gives enough
flexibility on bin size and centre frequency to allow measurement of any
signal that comes in at audio.
Andy G4JNT
how to get a sensible reading with on/off keyed signals and
significant levels of QRN. A strong carrier or QRSS signal is easily
measured with any old AC voltmeter on the audio or IF output - but
it is not always possible to arrange such a signal. However, with
manual CW (and presumably modes like BPSK), the varying signal
level makes it difficult to get a steady reading. I have
tried using a >
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