[R-390] CV-591

Tom Warren [email protected]
Fri, 17 Jan 2003 17:48:13 -0500


There's also another possibility.  You know that the 455 kHz output of the
RF deck comes as a balanced pair.   Only one side of the balanced pair is
used for the 2, 4, 8, and 16 kHz positions of the bandwidth switch.  Thus
you can take the other mini-BNC connector (P518) and feed that to the IF
output jack.  Then if you have that connection loaded by a high impedance
input to the Eldico (if in fact the input impedance of the Eldico is high),
then everything works fine.  Depends on the sensitivity of the Eldico also.
This technique works just fine with my Siemens D2007 Frequency Selective
Voltmeter used in its high impedance mode and as a SSB IF strip and
demodulator.  Then you can compare the SSB performance of the R390A versus
the Frequency Selective Voltmeter  --  and the comparison isn't too bad.
Yep, my FSV sounds better just like 30-year-later technology should, but not
embarassingly better.

Tom, W4PG


>
> If Eldico has enough gain, you could tap R-390A IF ahead of filters and
feed
> to Eldico (involves mod to R-390A).
>