Question about Uniden Bearcat Pro PC78LTW 40-Channels Base CB Radio

1 Answer

Can not transmit

My radio recieves, but when I push the key down to check my SWR or talk, the needle does not move. Every now and then the sound goes down where you can't hear, and then comes back on.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 22 Answers

You'd be suprised how much a bad mic can affect your radio. Start by trying a friends 4-pin mic, or grab a cheapo one and try it. If its not the mic, then its time for some SWR tuning, the manual tells you how to do that. Its a very simple process to do, and once you learn the steps you'll go right through it like you've been doing it forever. If your mic is good, First I'd check my coax for any kinks or breakage. Problem is a lot of times you may have a bad coax and there isn't even a kink or bend anywhere, I've seen brand new ones that were bad. Then the ground where the antenna is mounted. Can you tell me if your using a mag mount antenna or a bracket?

Posted on Mar 19, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

NEEDLE MOVES ON RECIEVE LIGHT BURNT OUT AND NEEDLE DOES NOT MOVE ON TRANSMIT IN S/RF,SWR OR CALIBRATE BUT RADIO TRANSMITS GREAT..


try blowing some canned air on the knob and switch to remove dust , also try a dash of electrical component spray on them , then see if it works.

May 06, 2015 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

Receives fine, needle does not move on transmit, transmit light lights


Needle on the meter might have went out . Is it stuck in one spot? If it moves during receive and goes to zero when keyed it most likely the final.

Mar 08, 2015 | Radio Communications

2 Answers

Cobra 29 now Ltd classic Cobra 29 nw.ltd classic receives not well but does not transmit don't even move the swr./power meter any ideas


High SWR on antenna system.. may have mess up your RF final transistors. if you were talking on it for a long time. have someone check the SWR on the antenna system... should be a FREE service.

Jul 13, 2014 | Radio Communications

1 Answer

NEEDLE IS TO LOOSE TRANSMIT AND RECIEVE


turn the SWR/CAL/S-RF switch and set it back to S-RF

Nov 17, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Radio transmits and recieves but is like squelch is turned way up and needle doesnt move at all


Check your antenna. Make sure it is getting a proper ground. If mag mount; make sure base of antenna and where you put it are both super clean. Check where whip goes into coil or base. Make sure all allen screws are tight and whip is not either all the way down to the base or up to the top. If antenna is mounted; make sure that it has a good ground. You might have to remove some paint around the base to get a good connection. DO NOT TRANSMIT WITH A HIGH SWR. YOU CAN BURN OUT THE EXPENSIVE POWER OUTPUT TRANSISTOR. Hope it helps.
Tom

Aug 16, 2011 | Cobra 29 LTD CB Radio

3 Answers

My radio is recieving a signal from other cber's but i don't think they can hear me


Go on a channel where people are talking and when some one stops transmitting key up and say, "breaker breaker, can I have a radio check please?"

that is how you call for a radio check to see if people can hear you.

breaker breaker, or break break means kind of like, "excuse me, I would like to talk on the channel please."

If they hear you the will most likey say, "its working." or "Checks in the mail." You can then ask them after that how the radio sounds.

Also make sure your mic gain is up.

If you get no response then there may be another problem. Make sure you followed the instructions that came with the radio on how to tune your antenna for best SWR. This is important.

Dec 08, 2009 | Cobra 19 DX IV CB Radio

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

2 Answers

Midland alan 48 plus transmit scale not moving


Sorted now, soldered a new output transistor into the board and all working.

Dec 11, 2008 | Midland Radio Communications

Not finding what you are looking for?
Uniden Bearcat Pro PC78LTW 40-Channels Base CB Radio Logo

112 people viewed this question

Ask a Question

Usually answered in minutes!

Top Uniden Radio Communications Experts

Iron
Iron

Level 3 Expert

3018 Answers

Robert McClure

Level 2 Expert

160 Answers

John
John

Level 2 Expert

509 Answers

Are you an Uniden Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...