I finally pulled my R-4A out of its place on my operating desk and got the
covers off. As I was undoing the nuts in preparation for PTO removal, I
noticed that there was a 10V zener on the small board that the wires from the
PTO connect. I also noticed that one end was broken but still touching its
connection.
A couple of things come to mind. First, the schematic and comments I've heard
from others on this list strongly suggest that the zener should be inside the
enclosure. Second, if that's true, then a previous owner tried to correct my
"frequency-jumping" problem by installing the zener externally to the enclosure
to avoid the extra work. Could it be possible that the zener inside the
enclosure is still behaving erratically and intermittently conducting at some
voltage below that of the external zener? I haven't pulled the receiver back
off the desk (arggggh...) yet and wanted to get a general opinion.
Am I right in assuming that this zener - which was installed on the back-side
of the little board - was added on?
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
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