I'm currently in the process of converting a Micor (unified type
chassis) base station to repeater duty. I have all factory docs, a
service monitor and a Motorola test set, unfortunately I don't have a
low wattage slug for my wattmeter.
I was fortunate (dumb luck, I guess) to find two Micor Unified chassis
with ALL ham band split components, (one is missing the PA and power
control boards, but it has the "good" receiver). I've got it up and
running using the original squelch gate card and station control
module for now. It receives great, the COR is tripping but it's not
yet transmitting.
Not having a means of measuring the 400mw output of the exciter, I'm
depending on the "ball park" readings the manual and various articles
I've found say the test set should be displaying.
I tuned the exciter as per the manual, however, when plugging the test
set into the PA and switched to position 1, the manual says there
should be a reading of 15uA which is drive from the exciter, I'm only
seeing 3 or 4uA. I tuned up the second exciter and see the same
reading. I swapped the exciter filter and no change. I even took a
TFD6112APR filter, drilled holes to allow retuning and tuned it under
operating conditions, same reading.
I'm either seeing a false reading from the test set or there's a
problem with the PA/power control board (if it's not an issue with the
exciter(s), of course).
I did not have the luxury of testing the base station first, the
crystals were removed from the channel elements. Yes weird, but I
believe these base stations were used by the FBI at one time.
Also, I currently have the xmit channel element running all the time.
I may not leave it this way, but this machine is going to a site of
limited accessibility and I want to age the crystal. What difference
should I see in exciter output from sitting in an no receive, idle
state, opposed to transmitting?
I could be missing something simple and obvious here, but I would
appreciate a "push" in the right direction as well as any tips and
tricks you guys may have to help me finish this project. Thanks.....
Don
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