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LF: RE: Measuring receivers

To: [email protected]
Subject: LF: RE: Measuring receivers
From: "Talbot Andrew" <[email protected]>
Date: Tue, 9 Jan 2001 09:50:07 -0000
Reply-to: [email protected]
Sender: <[email protected]>
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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