Joe was right. I feel like an idiot! But this experience
served as a very effective reminder... I doubt I'll be
making this mistake again any time soon. :-)
Service monitors and spectrum analyzers don't live out here
in the sticks. So when I had reports of a spur I dragged
out my receivers to use as test equipment. I made sure I
had several diverse receivers (instead of relying on one)
but failed to check the IF schemes to be sure they were
really diverse. It turns out all of them use a 455 kHz
second IF with low side injection.
I did find one receiver with a 450 kHz IF... and the "spur"
magically moved 10 kHz. Oops!
So it turns out to be the best kind of problem: someone
else's. I'm not sure what we're going to do now... at
least one person will be adversely affected unless I change
repeater frequencies (AGAIN - long story) or he gets a
different radio. At least now I can get these Micors off
my test bench! There's other stuff in the queue waiting
for bench time.
Paul N1BUG
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