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ICOM1.ZIP
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IC22S.1
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1991-02-22
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2KB
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32 lines
IC22S.1
I have prepared information to modify the IC22S sythesizer to allow it to
have 5 KHZ steps in lieu of the original 15 KHZ steps. This will allow the
rig to go onto 145.01 MHZ for packet radio operation.
In short, the modification requires changing a crystal, making some copper
path cuts, adding some jumpers, and installing a new divide by N counter
which consists of three CMOS digital integrated circuits.
If you put it on a frequency as low as 145.01 you will also need to re-tune
the front end and you may need to re-tune the VCO free running frequency. I have
made the mod to my radio and am using it to up-load this file. I re-tuned the
front end to increase sensitivity back to the normal although it did work
without re-tuning. I did not have to adjust the VCO.
If you would like to receive the information which consists of a schematic
of new counter, old and new block diagrams and instructions to
incorporate and test the modifications, send an SASE (standard business
envelope, 22 cents postage) to:
Jon Reeves, WB9CNE
12125 Trolley Rd.
Oaklandon, In 46236-3056
NOTE: The information which will be mailed is being prepared for publication.
It is requested that the information be used only for modification of your
personal radio and not be passed on without this note or placed on any
bulletin board system. I am releasing the information now to assist packet
radio operators in their efforts to move to 145.01 MHz and would
appreciate consideration of this request.