[Motorola] UHF MICOR Base

Sun, 20 Jan 2002 13:26:11 -0800

You most likely will need to tune the filter that is part of the low level
amplifier.

There is a thin metal cover soldered over the tuning screws and this is not
"field tunable".

You should use a tracking generator to look at the filter before you tune
it. Then tune for 440-450 range.

Do some logical troubleshooting before you assume that there is a bad part
in the low level amp section. They rarely fail.  BE SURE to check the power
control section! I have 20+ years working on the Micor UHF (and other
bands), the don't fail that often!

What frequency are you transmitting on ? When I was using a Micor and
transmitting on 444.725, you need to tune it!
Good luck!

73
Jim W7RY

----- Original Message -----
From: Glenn Little <[email protected]>
To: <[email protected]>
Sent: Sunday, January 20, 2002 12:43
Subject: [Motorola] UHF MICOR Base

| Our radio club has a UHF MICOR repeater that was donated to us. After a
lot
| of work, we got it on the air.  This only lasted a day.  After
| troubleshooting the transmitter problem, we feel that we have a
| Tripler/Amplifier (TLE1603B) problem. We have zero power out of this
| module, where we had 1.6W out when the repeater was working.  We have
about
| 400mw input at VHF into the tripler.
|
| Does anyone have any experience with repairing this module?  The manual
| lists it as not field repairable.  The module is currently inroute from
the
| site to my house for investigation as to repairability.
|
| Does anyone know where a spare might be obtained?
|
| Thanks
| 73
| Glenn
| WB4UIV
|
|
| --------------------------------------------------------------------------
-
| Glenn Little                         [email protected]   QCWA  LM 28417
| Amateur Callsign:  WB4UIV            [email protected]   AMSAT LM 2178
| QTH:  Goose Creek, SC USA (EM92xx)                      ARRL  TAPR
| --------------------------------------------------------------------------
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