[Motorola] MITREK questions

Thu, 7 Nov 2002 07:06:09 -0800

I've converted Mitreks for data-only.
I don't know the specific models and how much retuning you will have to do.
My model was 60-watts and approx 135-160 MHz split.
The way I modified mine was to remove the speaker and control head.
I set the TNC (AKA radio modem) so it would work without receiver squelch.
This improves sensitivity, and the setting also ignores non-data "junk"
on channel which may cause retry-outs.
If you are a squelch fan, then you can make a voltage divider (two
resistors)
to simulate the missing squelch (in the control head you threw away).
I completely rewired the connector with smaller gauge power,
control and audio cable.  This made a neat package no "dangles", control
heads or speakers.
Jay

-----Original Message-----
From: Ken Cechura [mailto:[email protected]]
Sent: Wednesday, November 06, 2002 10:54 PM
To: [email protected]
Subject: [Motorola] MITREK questions

Gosh the list has been quiet lately....

Well, among all my other projects, (getting some low band MASTR II's in
service, working on my truck, etc.), I decided that a MITREK might be a
good data radio, since it's relatively small, and I have one on hand.  

Radio Model Number: T83JJA3000BK, Chassis Number HUD1032B
What I know at the moment:

110W, PL, "one channel(? I see 4 slots...)", 146-174MHz chassis,
ummm....thats about it at the moment (it's tuned for 151MHz right now)

What would be required (can it be done?) to move this radio to
saaayyy....  144.390MHz, 145.010MHz, and maybe 2 other frequencies in
that range?  I'm sure someone's figgured out that I want to turn this
into a data radio....  My ultimate goal would be to turn it down to
about 50 watts, and run it as an APRS tracker, with the ability to do
regular packet sommunications in the area.... But in order to do so I
need it down at 144 MHz....

I'm not afraid of workign on it (I have some alumni who might be willing
to work with me on the project, right Mr. F?), I just need to be
educated first...I am lacking in a manual, or a place to start looking
for what I need to do to modify this radio!!

Thanks
Ken

       Kenneth R. Cechura, KC9UMR 
      University of Missouri-Rolla
  Department Of Electrical Engineering  
     President, 2002, W0EEE, UMR ARC
        email: [email protected] 

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