Question about Uniden Bearcat Pro PC78XL 40-Channels Base CB Radio

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Mic not Keying up

I was given this radio and got it calibrated and it recieves very well but the mic is like it is not keying up others say I sound like static to high pitch.

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Sounds like you are not modulating well. try adjusting your amp.also, test your antenna for wire breakage and, make sure that your mic has good wires as well.

Posted on Jan 28, 2009

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1 Answer

CB is in transmit mode with no mic connected


Got a short either at the mic socket or the keying circuit--try first to disconnect leads at the socket one at a time.

Jun 12, 2012 | Radio Communications

1 Answer

Im tying tom calibrate my cobr 29 nw ltd with firestik 2 antenas im putting the cal button and keying mic and making the neddle go to the left side of the metter where the number 3 is at because if put on...


I'm not sure I understand exactly what you're doing, but I can tell you how to do
an SWR calibration. You have a three-way switch on the left next to the meter.
From top to bottom they are: s/rf (signal/radio frequency), swr, and cal (calibrate).
Put the switch in the "cal" position. Key the mic and hold it. Turn the SWR calibration
knob one way or the other until it lines up with the triangular mark in the upper
right corner of the meter. Then put the switch in the middle (swr) position and key
the mic again. It will give you a reading on the swr band on the meter. The lower the
better: 1:1 is perfect, 1:2 is OK at best. Any higher (especially over 3:1), and you have a
problem that can't be fixed by tuning. You have a bad antenna, a bad coax or a
mismatched pair of antennae if you're running co-phase.Hope this helps.

Jan 15, 2011 | Cobra Radio Communications

1 Answer

When keying up i hear a ecko coming out of box click sound


This usualy says that there may be a break in the Mic. wiring. To find this out sometimes if the break is at one end or the other you can try while keying up und speaking into mic. wiggle the wires at the plug or where the cord comes out of the bottom of the mic.
Sometkimes the cord can be cut and re-soldered or, replace it regardless. The latter may save you the same problem down the road..........HAVE FUN ! !

Sep 22, 2010 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Superstar 121 with astatic power mic and texas star dx 500 power..when I key up to talk they say I sound like I'm a ways from the mic, but I have a loud roger beep...any ideas....mic?...


try a stock mike or a noise canceling one. Hard to run power on top of power. And see what your radio is dead keying into the radio...usally with a 500 it can take up to a 6 watt dead key.

Nov 10, 2009 | Superstar SS-121 120-Channels Base CB...

1 Answer

I have no sound, even when I key mic. The meter goes up one time and not the next.


This could one or more of the following problems. I'll start with the ones I feel are most likely the cause, but you can check them in which ever order you like.

When the mic is keyed, you should not hear anything from the reciever. The mic's PTT (push to talk) button switches the transciever from recieve mode to transmit mode, if it didn't all you would hear and transmit would be screaching feedback. Also, during the transmit mode, the radio's meter should switch from indicating relative signal strength (or "S" units) to power out where 4 watts AM should indicate full scale deflection of the meter.

This makes me believe that you've got a intermittent connection in the mic circuit. This can be anywhere from inside the mic, mic cord, mic connector and inside the radio - from the mic jack. The cord is supect as it is always being twisted, pulled, stretched and strained under extremes of temperatures and humidity.

You can check the cord by simply replacing it or with a dummy load connected to the antenna, see if keying the mic and shaking the cable makes the power meter jump or bounce. Twist and pull the cord over its entire length - but pay particular attention to the strain relief points near the mic body and connector as these are typical points of failure.

Check contacts inside the mic, between the mic cord and plug, mic plug and mic jack on the radio to be sure there is no oxidation or broken / shorted wires.

There may also be a problem with a blow speaker, which would explain the lack of audio on the reciever. Connect an external speaker to the external speaker jack (if provided) or open the radio to connect a speaker to the one under test.

Least likely - but still possible is a fault with the antenna coax cable, antenna and / or mount. Look for split, crushed, or otherwise damaged cable along the entire length. Pay attention to pinch points, etc. Repair or replace as needed. Look for oxidation build up between the antenna and mounting threads - clean as best you can or replace. Check the coil (if any) on the antenna. Broken, burnt, etc.insulators over coils are indicators of a problems. Again, repair or replace as needed.

I hope this helps you identify the source of the problem - good luck!

Oct 30, 2009 | Midland 1001Z 40-Channels Base CB Radio

2 Answers

Cb is Keying Down instead of keying up when trying to talk


if you are transmitting fine Don't worry about the meter. Get an external SWR meter, they are better anyway.

Also, make sure the the switch next to the meter is all the way up on s/rf setting. thats for signal power and receive strength.

Aug 30, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 132 recieves good poor send


i would take it in and get a new diamond thats what it sounds like to me..

Dec 02, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cant transmit


Hello Darren, Yes it sounds like the mic is wired bass ackwards,,! A cobra 25 mic wiring is
PIN #1- Shield or ground wire
PIN#2- Audio or Transmit modulation
PIN #3- Transmit or Dead Key
PIN #4- Receive Audio.
When your keying the mic, the RX wires are being connected to make the RX work,,,
*** Let me know how you get along with it. Either buy a new mic wired for your radio or you or someone comfortable with soldering needs to resolder the correct wires back on the mic plug,,,Like I said, let me know and have a great day,, Mechanic is back quiet!

Oct 21, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Midland squealing when talking


soundwas keying up at the same time.s like it could be one of two problems. a loose wire in the mic or some one near you keyed up the same time as you. if the wire in the mic is loose sodder it. If some one keyed up near you you might have blown the reciever chip.

Sep 15, 2008 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Microphone


Hi,

If the radio receives OK and the TX red LED will not lit up when keying the mic, then it is a mic or mic cord or mic connector problem (or pin configuration). Internally to the mic, there is a switch for keying the PTT. This should be check down to the coiled cord to the connector.

If all of the above checks OK, then you would need to check the TX/RX regulator/switching circuitry.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 08, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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