My mast is down and all my new electronic is on a work bench with 2 batteries, one being used - one being charged, that I alternate on a regular basis. So power source shouldn't be the problem.

I took the cover off the dome (I'm using a snare drum stand to hold the dome outside my building) and the antenna hums softly in warm up period and goes in standby mode.

Now if you can hook up RS-422 output and inputs to single ended ports, I should be able to connect the Sitex MDS-1 radar on my new Standard Horizon CP300 chartplotter without going through a computer.