Hi Paul:
Could be any of the Amp stages in the RF chain, starting with the RF
Amp, then the IF amps,
But it could also be the AGC cutting the gain back..just like the rf
gain control does. If you measure the voltage on TP 2 on top of the
chassis, spec is -1.35VDC. if it is much more negative than this, with
the rf gain fully CW, then it is probably something in the AGC reducing
the gain.
What happens if you turn the AGC off on front panel. Also, what is
going on w/ the S meter? is it still sitting down around the left end
w/o signal?
Curt
KU8L
Paul Gerhardt wrote:
I must have asked this earlier but can some one tell me again which
tube might control the rcvr mute/rf gain in the R4B?
The radio worked fine for many months but then it is acting like the
RF gain is turned down or it is on mute. Some on the list suggested a
tube to check back in maybe '07 and I could not find it in the
Archives.
Thanks...
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
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