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TH75A.2
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1992-09-15
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TH75A.2
From: WA6TKV@N6IIU
The Kenwood approeed MARS mod for the TH-75A is very
simple. Remove the 3 exterior screws. There are 4 screws
where the battery pack slides on. Remove the 2 screws toward
the face of the radio. You now have access behind the front
panel. You will see a green wire near a square chip. Cut the
wire. You will now have transmit from 142-152 and receive from
136-174. Transceive from 420-450. Although you can actually
key in 385-512.
This is truly a fantastic radio! You can take the mod two
steps further. You wyll definitely need a service manual and a
very delicate touch. (Not for the weak!) Locate and remove D4.
It is in the same vicinity of the green wire. The radio will
now transceive from 136-174, some VCO adjustment may be required
for the entire range. It is also now capable of transceiving
from 385-512. The UHF VCO's have approximately a 50 MHz band-
width so you will only get a 50 MHz wide portion of 385-512.
The second step is adjusting the VCO's. There are separate
adjustments for transmit and receive for both VHF and UHF.
This calls for complete dis-assembly of the radio. Refer to
your service manual.
I have found these mods extremely valuable. Now I have
a dual band ham rig and a police scanner in one. Have fun and
please use EXTREME caution in transmitting only on your amateur
and MARS frequencies.