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Kenwood TH- 25AT mods
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TH25AT.4
Subject: KENWOOD TH-25/45 OUT OF BANAD MODIFICATIONS
Here are some mods for the TH-25AT and the TH-45AT. Please
note that I do not encourage transmitting on a frequency for which you
do not have a license, nor do I encourage transmitting on a non-amateur
frequency without FCC type accepted equipment (in the United States).
First let me recommend that you buy the service manuals for these
radios. The service manual is not expensive (about $15 I think) and it
will greatly help you in performing these modifications.
Look at the schematic for your radio. In the lower left hand corner is
an IC labled IC2. This is an ASIC microprocessor. At the lower right
hand corner of this uP are several diodes and pull-up/pull-down
resistors. They are D4, D3, R19, R18, R28, R20, R21, R22, R25, R26, and
a couple of resistors that are not even on the schematic that attach to
B2 (pin 51 on IC2) and B3 (pin 50 on IC2). The TH-45AT schematic shows
R23 on the ASIC uP pin B2.
CONTINUED IN FILE TH25AT.10
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