Thread: GME TX472D receiving, not sending..

Originally Posted by PhilipA

Happykid, we got a bit ahead of ourselves here.
AFAIR , I asked that you advise what the person receiving reported as the signal strength.
It may well be that the amplifier is crook, or the antenna lead is broken.
Maybe go to a specialist shop for them to check it.
I cannot see your location from this pane, but if in Sydney there is a shop at Roseville AFAIR.
Regards Philip A

I tested the signal only by using a handheld UHF only about 30m away.
Im not sure what you mean by signal strength of the person receiving because all they receive is a static noise when the mic button is released. however on my car unit (the problem one) the signal is loud and clear when receiving from the hand held at that distance. I have used both a largish fiberglass (i think) antenna and a small wire one and the symptoms were the same with each.
Im located near parramatta, I called that GME gladesville office to ask about a replacement mic and they were helpful so ill try again and ask about where a specialist shop might be closer to me.
If their diagnosis is a bad mic then ill replace it.
Thanks for the help so far, and if you think the test that i conducted wasn't sufficient then what would be a better way to do it?

A quick & simple test is to check your aerial connections with a multi meter.

Take the plug out of the back of the radio, and check between the outside & the centre pin. It should show that there is no connection between the two.

If there is any sort of connection, you have a wiring fault in the antenna.

Next, check for breaks in the cable with the multi meter. Centre to centre should show very little resistance.

At the range you are testing, it is possible that a signal will get into your radio, but if the antenna wiring is faulty, then you wont get one out.

Most in-car units AFAIK have a signal strength meter which is a number of climbing bars, just like the one on your mobile Phone. My Uniden does.

If the person receiving reasonably close to you is showing a good signal strength but no audio, then your microphone is probably stuffed.

If the person receiving shows a weak signal strength, then your antenna is not connected properly, your transmitter amplifier is stuffed , or there is something else wrong.
Regards Philip A

My radio was doing something like yours. I tracked the fault to being a poor earth (12v) connection to the radio. Obviously for reception the current draw is a lot less than transmission current so it was only during transmission that there was a problem. These partial faults are always a pain in the backside to sort, would have been easier for me if had died altogether.