Batboard

How to activate PTT pin 13 on Motorola Astro Mobile t99dx J2 or J3 15pin rear connector

You will need to change a jumper on the command board. To configure the option connector PTT input remove JU518, place it in JU500.

If you also want external Mic Hi, remove JU521, place it in JU513.

These "jumpers" are actually zero ohm surface mount resistors. They are physically located on the underneath side of the command board. Changing them requires virtually complete disassembly of the radio - remove the control head [or remote mount front], the top cover, the PA, the vocon, and finally the command board.

You should have surface mount rework capability and a static safe work environment available.

You will need the basic and detailed service manuals - 68P81076C20 and 68P81076C25 respectively.

The basic manual shows the recommended disassembly and reassembly procedures. The detailed manual has the schematics and board layouts.

Hi there just wondering if anyone has the mods to gain External PTT and Mic Input for a Astro Spectra W9 HIGH POWER HOUSING

Thank you,