"chuck" wrote in message
ink.net...
Good info, Owen. I think the EIA test procedures really have FM or AM in
mind, rather than SSB or, what is exactly the same for SINAD purposes, CW.
The 60% figure just doesn't apply to SSB or CW. You would simply use an
unmodulated signal generator with the frequency offset to produce a 1 kHz
tone in the receiver's audio output, preferrably centered in the
receiver's passband. Then a measure of rms af voltage at the receiver's
output with and without the 1 kHz filter would be made.

We don't hear much about SINAD testing procedures for SSB and CW. Even the
ARRL's test procedure manual glosses over the procedure for other than FM.

The old Canadian Department of Communications Document RSS 125 Issue 1,
Released August 1st, 1976, precisely describes the method of SINAD
measurements for SSB equipment. In the past 25 years or so, HP's distortion
analyzers (such as the HP8903B) were used for this measurement. In the late
60s and early 70s I have seen Heathkit distortion analyzers used for SINAD
measurements. The latest versions of RSS125 seem to be more in line with
FCC standards, where receiver specifications are not required for
certification purposes (See
http://www.agiletestgroup.com/ICCertifications.html).

73,

Frank