Motorola actually sells the 'dummy mic plug' that has this jumper in it. 
I just use Ethernet tools and plugs and a piece of wire and make my own.

Joe M.

Mike Morris WA6ILQ wrote:
> At 12:45 PM 04/03/09, you wrote:
>> Motorola Maxtrac - Radius Mic Plug Pins to Enable CTCSS decode?
>>
>> Hello groovy guys and gals...
>>
>> The Motorola Maxtrac, GM-300, M120 and similar Radius Radios
>> enable the CTCSS/DCS decoder "on-hook, off hook" with a connection
>> through the mic jack/plug.
>>
>> These radios made/placed into repeater service are sold with
>> "jumper plugs" placed into the mic jacks. These plugs are simply
>> a single wire jumper looping two pins, which place the radio in
>> full time CTCSS decode.
>>
>> So... the 50 cent question is...  does one of you 100% know the
>> proper two pins used to enable the CTCSS decoder? I need to make
>> a few...
>>
>> thanks
>> skipp
>>
>> skipp025 at yahoo.com
> 
> As Moto numbers them (with pin 1 being on top), it's pins 3
> and 4 (3 is the hangup box lead, and 4 is ground).
> 
> As ethernet numbers the pins, it's backwards from Moto
> and is 6 and 5.
> 
> Years ago I saw a Maxtrac for sale at TRW that had a
> mess of Dymo labels on the speaker area of the front
> panel.
> A closer look revealed that someone had drilled a hole in
> the center of the speaker area, and mounted a mini-toggle
> switch.  It was labeled "PL" and up was labeled "ON",
> center was "OFF" and down was "HANGUP BOX".
> No comment.
> 
> Mike WA6ILQ
> 
> 
> 
> ------------------------------------
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