maratrac

Hi. I know this is pretty obscure information, but I'm looking to interface a Syntor X9000/Spectra handheld control head (HCN4027C) to a Radius M400 mobile (almost the same as a Maratrac). It looks like the Syntor/Spectra HHCH is the same as the Maratrac HHCH, but with a round connector...

I know this has been posted before but it has been awhile and I am a new member. I recently bought a Maratrac off ebay and need any instructions on installing it. If someone has a manual they are willing to share or install instructions I would appreciate it.

Being the one currently in charge of radios for my FD, I'm getting complaints from some members that the volume control for one of our first-out units is causing a problem. Reportedly the audio levels are changing on their own, and there is a notable lag/overrun in the intended volume control...