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maxtrac9.p
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1994-10-26
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copied from packet:
From: dbm@cats.njit.edu (Dean McDermott - WB2CMN)
Newsgroups: rec.radio.amateur.misc
Subject: Re: Any info on Moto gear for 902mhz FM?
Keywords: Motorola FM 900 902
Yes the Maxtrac will work on the 900 ham band.
I have one Maxtrac converted and while getting to work took quite some
time the final mod is not that bad.
Conversion:
Start with a 900 Mhz Maxtrac. If is is conventional then fine, if not then
order FVN4019A conventional firmware. You will also need to order two Murata
filters (# DFC3R915PO25BTD) from a Murata Erie dist in your area. Locate two
chip caps with a value of 1.1 pf.
Install firmware if not already conventional. Remove the two Murata filters in
the front end and replace with the above so that the radio will pass 915 +- 12.5
freqs. Locate the VCO and using a LARGE solder iron heat the top cover and pry
it off. Now looking into VCO you will see that the small board has components on
left and right halfs and they are a mirror of each other (the left and right).
Looking in two corners you will see chips with chip diode directly under it. It
is very very tight in this area.
Remove these two chip caps that are next to the chip diodes. Replace with the
1.1 pf caps *** NOTE: The value of these caps might vary -- you may have to put
anything from 1.1 to 1.9 pf in -- DO NOT use too much solder when installing
caps. It is very easy to damage the VCO!!!!
Now put everything back together. I have mine operating with a RX area of 920
to 921 and TX of 907 - 909. Programming of the radio will require Maxtrac
conventional software and when the program tells you the frq you entered is out
of band disregard it and continue.
Dean
dbm@cats.njit.edu
===============================================================================
Note: I haven't tried or verified this, proceed at your own risk. WA2ISE
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