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TH25AT.MOD
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1980-01-01
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59 lines
TH25AT.3
TH-25AT MARS/CAP MODIFICATION
The following modifications will allow the TH-25AT to transmit from
141.000 to 162.995 MHz. Specifications are guaranteed for the Amateur
band only. The transceiver may require realignment of the PLL
circuits.
1. Disconnect battery pack and antenna.
2. Remove the volume, squelch and tuning control knobs by pulling
them straight up from the top panel.
3. Using a 7mm spanner wrench, remove the nut from the volume
control and the nut from the tuning control.
4. Remove one screw from the back of the radio, by the PTT switch.
5. Remove one screw near the speaker jack.
6. Remove two screws from the battery terminal plate:
--- remove ----
/ \
+---------------------+
[ 0 0 [
[ [
[ +------+ [
[ [ [ [
[ +------+ [
[ [
[ O O [
+---------------------+
7. Carefully pull the front panel up from the transceiver (do not
break the wires connected between the front panel and the body of
the transceiver). Lay the front panel to the side of the
transceiver (keep track of the PTT and F.LOCK covers if they come
off).
8. Gently lift the top panel from the transceiver by pulling it
forward and then up (the O-ring on the BNC connector will produce
some tension).
9. Rotate the top panel toward the front of the radio to expose the
3/4 x 3/4" board.
10. Using a 45 watt (or less) soldering iron that has an isolated or
grounded tip, unsolder and remove chip resistors R19, R20 and R21
from the control unit (X53-3080-02).
11. Carefully reassemble the transceiver by reversing steps 1-9.
Pull the BNC connector O-ring up a little before installing the
top panel.
12. Reset the microprocessor by following the procedure in the
instruction manual (p. 16) called CLEARING ALL MEMORY.
Disclaimers: The source of this information is unknown and not
personally verified. It is illegal to transmit outside the ham bands
with this equipment.