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.