Batboard

I have programmed up 3 GTX portables. They all work just fine except that two of them transmit a low level popping sound that I can best describe as "motorboating". Looking at the service monitor, it looks like there are very low deviation spikes on the carrier, maybe in the PL encode signal. Has anyone else seen this? Maybe I have accidently programmed the radio in some kind of lame configuration.
Thanks
George

Not exactly, but I have seen low / bad batteries cause that on other radios. See if swapping batteries has any effect.

Also, the GTX deviation adjustments allow you to balance the low and high frequency values. These could be way off. Check them out. The balance should be near the center of its range; the overall deviation about 3/4 of the way up.

All of the GTX 900 MHz radios I've touched had low deviation, around 1.75 kHz. I've bumped them all up to 2.5 since, in my area, we're using a 5 kHz-wide MaxTrac as a repeater receiver.

Bob M.

Hrm. One of my portables is doing this too. I will check it out.

I bought a GTX handheld at Dayton last year and mine did the same. I found that if I squeezed the case just righ the noise went away. Taking the radio apart I found one of the metal shields was loose, I think it was the one over the keypad. Radio plays fine now. good luck

I thought I'd replied already but I guess I haven't. My motorboating problem doesn't follow the battery. It's one radio specific.