Hi Ray Brown Kb0stn, hope you are having a nice day
>> you'll need a Hi-Z ceramic mic.
RB>  A service manual... hmm. Are you the one that mentioned a few months 
RB>ago that you worked on these critters? If you are, I'd like to tweak one 
RB>from 47.5 up to 52.525. :-) Actually, what'd be _really_ nice would be to
RB>convert this from a 301 to a 304 (4 channels instead of 1).
RB>   Can you help me out?
 Nope it wasn't me, but I'll help if I can.  I made a bit of a goof on the
manual I have though.  It's for the BTL-301/304, instead of the 301/302.
As for going to 4 channels, depending on what versions of the rcvr and 
xmtr boards are used, you can have upto 12 recieve and 12 transmit channels.
And based on the design used, there's no reason why you couldn't replace
them with a synthesizer.
 The reciever is tuned in 3 segments (29-35, 35-44, 44-50) and the 
transmitter in 7. (29-32, 32-35, 35-38, 38-41, 41-44, 44-47, 47-50)
 The reciever board in the s.m. is etched with the number 500-943.
It uses a diode matrix to select which crystal to use and has the
lands for up to 12 crystals.  And It appears to have been used at least
up to 4/75.
 The transmitter board was revised several times and by 4/75 included 
a swr-mismatch auto powerback, and a change to a different board layout.
If the board is marked 500-996 then is supports up to 12 crystals,
if it's marked 501-183, then it only supports 6.
From the looks of things you could possible get all of 6M out of it with
a few part changes, and there was a module put out in '77 that would let
you go from 30W to 100.
 The manual and additions would run 100 or so pages copied (half if done
doublesided) 
 
 -=> Yours sincerely, Paul Williams KB5IVG<=-
... "Oh, yes, it gets much worse."--Todd Sullivan
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