Don, You don't mention what band/frequency the Micor is on, (I assume
UHF) and if you have a station monitor as you stated, it has a
wattmeter built in that can measure the power level from the low
level exciter board up through the output stage. Of course, you'll
need an "RF" RCA connector to connect to the low level exciter board
output. Not sure what you mean by the statement "What
difference should I see in exciter output from sitting in an no
receive, idle state, opposed to transmitting?" ???
George
--- In Repeater-Builder@yahoogroups.com, "donlspivey" <[EMAIL PROTECTED]>
wrote:
>
> 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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