I am using a National NC-300 with my Drake T-4XC transmitter (using the Drake
muting and antenna changeover system).
When I key the transmitter in CW I get a rather loud "thump" in the receiver
along with a very brief squeal if I the receiver is not perfectly zero beat on
the transmitter. When I key the transmitter in SSB, I just get the thump.
Obviously I am getting a little RF into the receiver before it fully mutes. I
do NOT have this problem with a Drake R-4A receiver that I have tried.
The NC-300 was just recently fully restored (new caps and replacements for out
of spec resistors) and aligned. Voltages are all in spec and the receiver
appears to be working extremely well.
Have any of you run into this issue and if so, did you find a fix for the
problem? It does not stop me from using the rig, but it is certainly an
annoyance.
I know, some of you are going to tell me to dump the NC-300 and use a good
Drake receiver, and in the end, I may do that. But in the meantime, I would
like to use the National.
Hank
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