Newsgroups: rec.radio.amateur.homebrew
From: rwilcox@newton.cacky.com (Gary Wilcox)
Subject: Old GE UHF HT 
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Keywords: HT Convert  
Reply-To: rwilcox@newton.cacky.com (Gary Wilcox)
Organization: Commonwealth Aluminum
Date: Wed, 2 Aug 1995 13:14:55 GMT


All

	I have aquired an old GE UHF HT. It doesnt have a model number
but it has the number 121A MP1 Series. It has 2 channels in the 450 Mhz
range. Can this be converted to Amateur use? Is it as simple as changing 
crystals. How hard would it be to build a VFO to replace the crystal.


Gary Wilcox
KE4VUN
rwilcox@newton.cacky.com 


From: Jim Devenport <jdevenport@lanl.gov>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Old GE UHF HT
Date: 2 Aug 1995 16:06:35 GMT
Organization: Los Alamos National Laboratory
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To: rwilcox@newton.cacky.com


Yes, it is as easy as changing crystals.... but you will 
have to align the transmitter and receiver RF & 
oascillator/driver stages for best sensitivity and output. 
 If the original frequency is between 450 and 460 MHZ this 
is likely all you'll have to do.  If it is much above 460 
MHZ you may well not be able to align it to specs without 
modifying it by changing capacitance values in various 
stages in which case you'll certainly want a repair manual 
for it.  Depending on what model GE it is, it may be one of 
the series that employs a completely separate receiver and 
transmitter, that might make it easily made into a low 
power repeater.
VFO's of course are possible but very hard to keep stable 
enough for satisfactory operation at these frequencies.  
The necessary VFO output might be as low as 36 MHZ but 
since it is multiplied in frequency by subsequent stages 
whatever instability or error occurs is also multiplied by 
a like amount.
-- 
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
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