Accessory plug, there is an option to disable TX PL with a jumper or RSS 
option.

f...@fitzharris.com wrote:
>  
>
> Hi All,
>
> I have a Maxtrac with no Tx PL. I've checked the programming several
> times, even cloned another radio. I've tried both TPL and DPL. I've
> checked the Tx output on the service monitor and there just isn't any
> TPL/DPL there. Mic audio is there and deviating at the proper level.
>
> What else should I be looking at?
>
> Thanks,
> Sean
>
> 

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