| Author |
Message |
    
Drbob124
New member
Username: Drbob124
Post Number: 1
Registered: 11-2017
| | Posted on Sunday, November 12, 2017 - 11:59 pm: | 
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I have a Uniden pc66 40 channel am cb that when I key the mic I talk through the speaker. Keys up about 4 watts and transmits, but very annoying. Any Idea what would cause this problem? |
Charliebrown
Advanced Member
Username: Charliebrown
Post Number: 581
Registered: 10-2002
| | Posted on Monday, November 13, 2017 - 1:33 pm: |
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Have you made sure the radio is not close to the antenna? Also how is your SWR ? is it high? Is the radio and antenna grounded with a good frame ground? Any and all the above can be the cause. I have seen some mic be the problem. Have you tried another mic? |
Smitty42
New member
Username: Smitty42
Post Number: 5
Registered: 11-2017
| | Posted on Monday, November 13, 2017 - 6:10 pm: |
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I would try to flip each switch and each knob one at a time to see if it turns down or shuts off. I'm thinking someone might of installed talkback into the radio since it's acting like the talkback feature is installed.
http://cbradiomagazine.com/April%202007/Adding%20talkback%20to%20your%20radio.htm
Here's an artical of how to easliy install the feature in a few different ways. All you have to do is take the wires and/or parts out. If you have to remove the wires don't just clip wires and leave them hanging inside the radio as they could cause a short if they happen to touch something they aren't suppose to. So removing the wires completely is best.
When life hands you lemons find someone with volka.
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Charliebrown
Advanced Member
Username: Charliebrown
Post Number: 584
Registered: 10-2002
| | Posted on Wednesday, November 15, 2017 - 8:07 pm: |
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A lot of time's for example when a radio is mod to have past 100 percent modulation or it has any of the problem's mentioned above it will cause a lot of RF feed back until you correct the problem's. Sometimes even turning the mic gain down solves the issue if it has above 100% modulation. Yes Talk back is a big problem also . Smitty is right. When it come to radio's you can not ever have enough ground's. Base or mobile. |
Phantom5611
New member
Username: Phantom5611
Post Number: 1
Registered: 11-2017
| | Posted on Thursday, November 30, 2017 - 10:58 pm: |
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another cause could be that there is a short or pinched speaker wire touching the chassis or ground of the radio. this can create a talkback feature, or if someone installed a resistor around the external speaker jack to ground to attached it to the PA jack. if so remove it! |
