No rf signal between mic and reciever - Shure Audio Players & Recorders

If you're still getting loud squelch noise but do not receive on any channel, you must check the RF from the antenna to the audio stage(not included). There must be more than just one RF stage in this radio. Let me know what you find.

Is this new mic wired for your radio? just because it fits the socket doesnt mean its right. Did the old mic do the same thing reason why you got the new one? just sounds more like a loose wire at the jack where the mic plugs in? has that connector ever been loose or needed tightened at any time?

Have you checked the mic

Assuming you don't have the manual,basic controls for receive are to make sure the switch next to the meter is set to s/rf,switch for cb/pa is set cb,knob for rf gain is at max, squelch knob is fully counterclockwise..squelch can be adjusted if ya don't want to hear static but will start cutting out weaker signals.If none of the above works,try plugging in an external speaker to the jack on the back of the radio,if ya still don't hear anything,check that antenna coax is screwed in tightly in back of the radio.Next step after all that would be the microphone,is the stock mic,power mic..if it is the original stock mic that has not been rewired in any,then I would suggest taking radio to qualified cb repair shop,bring mic with you to shop so they can check it too,in fact I would bring the truck also so they can check antenna and adjust it if needed...Good luck

Adj VR1 next to VR2 they are in the center of the main motherboard. VR1 will allow you to adj the S meter in AM mode only.

the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Hi kb

That is an odd encounter, and most probably one of the R.F.I. kind. Radio Frequency Inference can be caused by many things. Sometimes it can be a nearby piece of equipment creating that much interference, that the mics could not operate. It may have been a spurious mobile radio transmitter as used with two way radio for the cops, ambo's, firies,or even a nearby Cab!! Some times faulty light dimmers can also spray RF.
To what ever end, the fact that 4 mics went down together is indicative of an external problem, and being radio mics, it would have been radio interference.
The only other thing to check is that they are UHF. there are many VHF mic systems still about, but these frequencies are now being used as part of the soon to be introduced digital TV transmission. Best check that they are UHF, The VHF type have actually been illegal for a number of years Hope this info has helped you understand your problem. I am happy to answer any questions you may have. Cheers

regards
robotek

yes try going to raidio shack and asking if they could fix it

I don't know what you've tried already to improve the signal level, so i'll list a few things that migt help.

It might help to put new batteries in (with the right voltage) You probably did that already.

There is a GAIN pot on the mic, in the battery compartment under the ring that is screwed onto the mic. When you adjust the GAIN, there will probably be better SN-ratio, but it does'nt change the RF signal

You could also adjust the antennas of the receiver, or try to set a different frequency (depends on which country you live in, in some countries it is illegal to change frequencies) or turn off the SQUELCH on the receiver

If this does'nt help, you could look for a user manual and try to find a solution in it.

There are some other solutions to improve RF signal, but those are quite expensive.

Receiver maybe out of adjustment for mic frequency band