Cannot hear any noise at all, when you turn the radio on, even when you turn the squelch wide open. Made sure the unit is on the CB and not PA mode. I know it transmits , because I can hear him talking to me on my base station but he cannot hear me talking to him. ANY IDEAS ?
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make sure the RF GAIN is wide open and the squelch is turned all the way to the left . Make sure its on CB not PA ,now turn the radio on and you should at least hear something. If not ,take it to a tech and have them adjust the receive .
It is most likely picking the noise up from the power source even if you have a filter on that---not too many things that can be done about that but some radios react more to this than others..........
No it is NOT a bad Pot, what is happening is that with the Squelch "Open" The "Trigger" for that circuit, is getting "Swamped" by signal, and is shorting out, the MCU, senses this and tells the Power Supply it is drawing too much current, and shuts it down. You will need to troubleshoot this area. It may be a very difficult to find. First you need a service manual.
www.midlandradio.com/Resource_/Product/787/.../75-785.pdf Above is a USER manual.
Try this. While with the engine running and radio on, while you hear the noise, disconnect the antenna wire from the radio. (DO NOT KEY IT).
If the noise is gone, then the noise is coming in from the antenna. A new location may be needed.
If the noise is still there then its coming in from the power line. You need to get a ground loop isolator. Make sure its not one for RCA cables. You need one for the power line. It connects to your power source, and then your radio connects to it. this will take most of the noise out.
turn the RF gain all the way up and leave it there. Also turn the squelch down until you hear white noise, then turn it up just until it goes away.
RF gain is how sensitive your receive is. The higher it is, the more range you have. There really is no need to turn it down ever, unless you are trying to not hear some one out in the distance. Normal operation, RF gain should be all the way up.
Now squelch is used to quiet non signal noise. Like white noise or interference noise, Or other radios with a really weak signal that you can't hear completely any way.
You just want it so it just quiets the fuzz noise. Depending on background interference and the amount of radio traffic, the may have to be adjusted to silence the noise you don't want to hear. When a strong audio signal is received, it will break the squelch, the higher the squelch is set, the stronger the signal needs to be to break it, otherwise it will silence it.