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Conversion of Motorola Mitrek Mobile to 6 Meters by Wes Nicholas KD3IJ This page was developed by Mike Morris WA6ILQ from an email posted by Wes Nicholas KD3IJ on the Repeater-Builder web group Thanks go to Wes for permission to present his work.

Notes from the Editor (WA6ILQ):
The model number mentioned in the email below is for a carrier squelch radio with the extender option.   The modfication below should work on all high-range low band Mitreks.
For information on the various model numbers and chassis numbers please look at the Mitrek Model and Chassis Numbers web page.

This is a simple modification that consists of moving the top end of the RF circuits from 50 MHz to 54 MHz.   No changes are made in the audio or control circuits.

From: Wes Nicholas KD3IJ Date: Mon, 22 Sep 2003 Subject [Repeater-Builder] Mitrek 6 meter mods Hi all, there was a request for some info on converting a Motorola Mitrek to 6 meters,and after I volunteered I had done it I got lots of requests for some info. So here is what I did to "move" mine up the band. First I have a Mitrek model number T51JJA2900AK 4 channel 60 watt mobile with KXN1085A RX channel elements and KXN1087A TX channel elements. All capacitor values below are in pf (picofarads). RX Preselector changes: C104 was 22PF now 10PF C106 was 22PF now 10PF C108 was 22PF now 10PF C110 was 22PF now 10PF Local oscillator/multiplier changes: C152 was 16PF now 8PF C153 was 68PF now 33PF C155 was 13PF now 7PF C157 was 14PF now 7PF TX Exciter changes: C701 was 16PF now 8PF C703 was 24PF now 12PF C707 was 33PF now 18PF C710 was 22PF now 12PF There was a "hidden" adjustment in the channel elements, a "tank" coarse setting possibly? that needed to be adjusted to get enough signal to the injection amplifier.The elements were tuned to operate at 46 MHz and had to now operate at 53 MHz. My radio was the high-split 39-50 MHz version. When I was finished the RX sensitivity was 0.16uv for 12DB sinad and 60 watts output. RX specifications call for 0.3uv. These mods were made by trial and error, but turned out very well. I basically went about half of the cap values and had lots of adjustment range in the tuning cans. I hope that this helps! Oh, by the way, I do have a real Mitrek manual (60 watt version). 73, Wes KD3IJ

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Original text (the white background) © Copyright Wes Nicholas KD3IJ
HTML by Mike Morris WA6ILQ
this page last updated 23-September-2003

Mitrek® is a registered trademark of Motorola Inc.

The information presented in and on these conversion pages is © Copyrighted 1995 - 2003 by Kevin Custer W3KKC and multiple originating authors.