Maratrac Intermittent tx

fidel · Post by **fidel** » Thu Oct 06, 2005 4:49 pm

Hi there im having trouble with my maratrac It intermittly doesnt transmit im not sure why ive tried mics. and checked my conectors any help out here Guys Thanks Terry

wx4cbh · Post by **wx4cbh** » Thu Oct 06, 2005 5:39 pm

Does the red XMIT light come on, but no TX?

Is the green wire connected to the SAME voltage source point as the large red power wire? If not, the MaraTrac is famous for letting you know it doesn't like ANY voltage difference between the two, and it especially doesn't like noise on the green wire that comes from connecting it to anything in the vehicle's accessory (fuse panel) harness. Motorola is anal about the subject in their installation instructions.

What is the actual voltage available to the radio? MaraTracs don't like low voltages at all.

How good is the ground point?

Will · Post by **Will** » Fri Oct 07, 2005 12:12 am

wx4cbh is correct the Green lead, receiver and exciter supply voltage, HAS TO go DIRECT to the exact same spot the big Red lead does. This must be connected to the + terminal on the battery.

The problem is a voltage difference on the Green lead causes the TX power control circuit to shut down the TX.

fidel · Post by **fidel** » Fri Oct 07, 2005 12:05 pm

ok thannks guys ill try that it isnt connected that way ill change it

jistabout · Post by **jistabout** » Fri Oct 07, 2005 7:41 pm

I had a VHF-HI Maratrac that would always turn on the xmit indicator but not always transmit. Turned out to be a bad antenna relay......