[Hallicrafters] SX-117 "S" Meter Readings?

[Ross Stenberg]

Bill, my SX-117 behaves the exact same way and I believe the cause would be
due to a higher 50kHz stage gain with the increasingly narrower LC filter
bandwidth and higher Q. I am not for sure, but other than the higher S meter
reading the operation seems entirely normal.

	73 Ross K9COX

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Bill Gerhold
Sent: Sunday, May 22, 2005 9:22 AM
To: 'hallicrafters-mailman.qth.net'
Subject: [Hallicrafters] SX-117 "S" Meter Readings?




While I just posted the SX-117 restoration has gone well with the BFO
adjustments, a new and puzzling item
has reared its head.

The selectivity control, which is connected to the 2nd conversion 50 kHz IF
section, is affecting the received (observed)
"S" meter level.  That is, in the 5 kHz setting, I get a certain "S" meter
indication, in the 2.5 kHz setting I get higher readings
and in the .5 kHz setting, I get even higher "S" meter readings.  All on the
same signal.

Looking at  the schematic, I do not see how narrowing the selectivity of the
receiver at the 2nd IF level would affect the "S"
meter readings in the 1st IF section where the "S" meter is connected!
While it matters little to me what the received signal
strength is, I am left wondering why this would happen as I see no direct
correlation between the 1st and 2nd IF operation that
would affect the "S" meter.

K2WH