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TM941A.MOD
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1991-03-23
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Mods for Kenwood TM941A Triple band radio
CAP mod---cut green wire behind control panel next to speaker jack.
TX 142-152 420-450 1100-1400
RX 117-174* 400-490 1100-1400
* AM detector is switched on for aircraft band
Crossband mod
Open bottom cover of radio and set the radio with control head facing you. 2
inches over from the left side of case and on back of first board is unlabeled
blue chip resistor R58. Remove resistor.
Select one band with PTT indicator and the other with green indicator
for crossband repeat or
Select one band with both PTT and green indicator. (Once activated whatever
is received on the two non-selected bands will be transmitted on the
selected band.
To activate, press F for 2 seconds and then push Mute. Once activated all
functions are disabled, including the PTT key. (In cross band repeat the
non-active band can be selected with control select and its frequency change.)
To deactivate, repeat the same as above--if activity happens during
crossband deactivation you must start over--or you can use control select
to select inactive band and then deactivate.
When the unit is transmitting any noise heard by the microphone will also be
transmitted.
Wide band frequency mod.
Reconnect green wire behind control panel
Remove R19 and R20 in control head. (remove the two screws on the back
of the control head and remove back. Four Blue resistors will be found
on lower left side. The are labeled R19, R20, R21, R22.)
RX 135-174 400-500 1100-1400
TX 135-174 400-500 1100-1400
actual operation over the entire span was not verified.
The radio wakes up in European mode, therefore frequency steps will need to
be reset.
No aircraft VFO control with this mod--When the green wire is cut,
aircraft frequency can be entered and stored into memory.
Note: When the green wire is cut, the shift key no longer works and odd
splits can not be entered into memory. The state of the wire only
seams to mater when power is turned on.
-------------------------------------------------------------------------
Other information found along the way to the above mods.
remove 19 in control head (green wire doesn't matter)
RX 1??-174 400-500 1100-1400
TX 135-174 420-450 1100-1400
remove R20 in control head. (Green wire cut)
RX 1??-174 400-500 1100-1400
TX 135-174 400-500 1100-1400
The shift key no longer works--displays the Co bell
special tx frequency input doesn't work--causes memory scan
instead of offset input.
2-meter stops receiving or transmitting but looks like it does anyway--
possibly receives in AM only
frequency steps sizes are cleared to 10 mhz in UHF--must be reset
remove R21 in control head. Tested with green wire cute
TX 144-146 430-440 1240-1300
RX 130-174 400-470 1100-1400
remove R22 in control head. Tested with green wire cut.
TX 144-146 430-440 1240-1300
RX 144-146 430-440 1240-1300 not verified
remove R19, R20 and R21 and/or R22 (green wire doesn't mater)
same symptoms as above with R20 removed and green wire cut.
TX and RX frequencies not noted
I am told that removing R56 (I'm fairly sure that's the blue resistor 3 7/8
inches over and 1 inch up on same board as cross band mod resistor) results in
only high and low power (no medium) control on all bands.
Please let me know if you find out any other mod or find errors in this doc.
Thanks to Mike wa7rps for crossband and CAP mods.
Mike Hugo ka6oij@wa6ybn.#cenca.ca.na.usa
1313 Autumn Ave.
Ridgecrest, CA 93555
... ...-.... 1200 N81N