tm-261

tm-261
KB2LJJ Radio Mods Database and Manuals
TM-261 Mods
www.r6-ru4montesecchieta.it
IZ5CCV
TM-261a Extended frequency
If you want to modify your radio from 142 to 152 Mhz cut green wire closest to the face of the radio.
If you want full coverage cut the one farthest from the face there both very close together and green.
TM-261 Mike Button
The Kenwood TM-261 2Mtr xcvr microphone displays an annoying feature: After you've had it for a while, the Mike Button must be
pressed harder and harder in order to keep it transmitting. Eventually, the button is so intermittent that you want to strangle it with its own
cord. The fix is simple.
Open up the Mike case (three screws) and carefully lift the back off, so small parts don't fall out onto the floor, such as the clear plastic
piece, and the spring. Look at the mike button lever inside, and you will see that pressing the mike button causes a little red piece of
rubber to press a micro switch, which actually keys the rig.
As this little piece of rubber gets old, it gets soft, and won't reliably press the micro switch, causing the transmitter to turn off frequently.
This little piece of sponge rubber is a little bit smaller than a pencil eraser, so i removed it, and replaced it with a trimmed pencil eraser,
which is not quite as thick as the original piece of ! sponge rubber. It has to be a bit thinner, so you don't apply too much pressure to the
micro switch when you key the mike, causing the micro switch to bend or break off the PC board.
I used a dab of rubber cement to hold the eraser in place, and let it dry for a couple of hours before reassembling the microphone. Now it
works fine, and my fingers aren't hurting from having to grip the mike button in a death grip to make it work!.
73 de Mike W8RY
Naming Memory on tm-261
Select MR
Power OFF
Press: MN + Power ON
Press: REV button
Choose the characters with UP/DOWN. Where VFO button is cursor to left and MN button to right.
Press MHZ to save.
Kenwood TM-261a 136-174 MHz transmit modification
Take off top cover cut two green wires only two there i think called w1 w2.
Transmit from om 136 to 174.
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KB2LJJ Radio Mods Database and Manuals
THE KENWOOD TM-261 MARS/CAP MODIFICATION INFORMATION TX-142-152 MHZ
1.DISCONNECT THE POWER CORD AND ANTENNA COAX FROM TRANSCEIVER
2.REMOVE THE TOP COVER (2 SCREWS)
3.LOCATE A GREEN JUMPER WIRE LABELED W2
4.CUT THE GREEN WIRE IN HALF AND INSULATE BOTH ENDS
5.INSTALL THE TOP COVER AND RECONNECT THE POWER CORD AND ANTENNA
6.RESET THE MICROPROCESSOR BY HOLDING THE MR KEY DEPRESSED AS POWER IS TURNED ON
7.MODIFICATION IS COMPLETED
|
| The modulation that is set on the TM-261A from the factory isn't always up
| to snuff. After having to repeat myself for about the
| 50th time in a month, I decide it was time to "turn it up".
|
| 1) Open the top of radio by removing to 2 screws and pulling up from
| the back of the lid.
|
| 2) Find VR3 and adjust clockwise until desired audio level is reached.
| (Mine is set to about > up)
|
| 3) Put the lid back on and stop repeating yourself.
|
|
| 73,
| KC8EVB
ATTENTION
The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.
http://www.kb2ljj.com/data/kenwood/TM-261.htm (2 di 2)30/08/2009 18.03.07
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