At 12/2/2005 18:23, you wrote:
>You could use an AC RMS voltmeter to measure recovered
>audio on another receiver, but the deviation would
>only be meaningful if fed with a sinusoidal signal.
>
>Bob M.
Another problem with using a standard NBFM RX to measure deviation is the
IF filters, which chop off a portion of the received signal.
I was able to modify an old Regency scanner for deviation measurement by
removing the 455 kHz IF filter & adding a resistive load across the
discriminator coil. The former mod allows almost all of the received
signal through the IF to the discriminator, & the resistor across the
discriminator broadens the frequency response (though audio output is
reduced somewhat).
Bob NO6B
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