Question about Uniden PC78ELITE 40-Channels Base CB Radio

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The whip on my antenna came loose.

I Talked a lot on the CB, before I realised, what was wrong.the SWR, was'nt that far off. But after re-tuning the antenna, I noticed a couple day's later, that I had no squelch. Then it was intermitent. I checked my SWR again on ch1 & ch40. The SWR didd'nt change. But when I held the mic button down. The needle jumped back and forth. From 1 clear into the red..And both red light's came on, just every now and then. I checked the mic connection, even tried a different mic. Is my radio worth repairing?

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Considering the cost of a new one. repairing would be a good idea.

Posted on Oct 23, 2007

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Ok you have probly bernt your finals my friend because if your swr is jumping about then the radio is putting out diffrent power all the time check it with a power meter and get bk to us hope this helps my friend:):):)

Posted on Jun 05, 2007

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Posted on Jan 02, 2017

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How To Tune A Harley Davdson Frame Mount CB Antenna?


hi William.
if you go to this link you will see lots of forums you can go in to to see how its done.

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Doesnt transmit very good


First make sure your SWR is nice and low 1-1:5 is recommended and no higher than 2. You can loose up to 50% of transmission with a high SWR. Your set up is as only as good as your antenna. I like the Wilson model antennas myself but there are many good antennas out there. The radio you have may have never been peaked or tuned. Even new they are far from the legal limit or 4watts swing 12 watts PEP. Also, don't be discouraged by those saying you are not getting out. Most these days have a far more watts coming out of the back. So their standard may be different. You can take your radio to a licensed tech and have it peaked and tuned. With the radio you have, it may be more (in value) than the radio itself is worth. But you will get more power out of it. Good luck.

Jan 22, 2011 | Cobra 19 DX IV CB Radio

1 Answer

How far can I get this thing to reach,and how ?


With a good antenna, and the antenna tuned for best SWR, about 8 miles from mobile to mobile, and about 12 miles from mobile to base radio.

You can modify the radio and turn up the power, it will get you more range, and make the radio sound louder, but you will still be limited, because radio is line of sight. Hills and structures block RF signals. you go down a hill, you will loose distance.

With a cobra 29 that has been tuned up sitting on a hill about 1400 feet above sea level, I was able to talk to some one on a base radio about 50 miles away with out my amp on. I also have a very very good antenna. not something you normally see either.

With a clear on blocked line from antenna to antenna, you can talk really far on a stock radio. There is a saying for CB antenna's. "Height is might."

There are a lot of things that effect the distance a CB can reach.

If there is Skip active, you can possibly talk thousands of miles with a stock radio. Skip is when the ionosphere becomes charged by solar energy form a solar flair and causes the radio waves to bounce off them, making it seem like you have a straight line of sight to places that would normally be blocked by the natural curvature of the earth.

Then there are Linear amplifiers. They increase the power of the signal of the radio. They will increase the output range, but then you may be talking to people that don't have an amp, and that you will not be able to hear them because they do not have enough power to reach you.

So, get a really good antenna. Make sure it is tuned for the lowest possible SWR. Refer to the manual that came with your radio on how to find out your SWR, and how to lower it. There will also be instructions on how to tune the antenna that came with the antenna. Then bring the radio to a CB shop or a CB tech and have them tune it up. It will cost about $30.

With my radio barefoot, and can normally talk around 30 miles or more without worrying about hills and obstructions. (Barefoot means, without the amp on)

Sep 15, 2010 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

I have weak talk back signal


Did you tune the antenna??

The antenna needs to be tuned for best SWR.

If the antenna is not the right length, then you will get signal reflecting back into the radio. this is bad and it can damage a radio.

The 29 has a built in SWR meter.

The lower the SWR the better.

Here is how to check the swr.

Turn to ch 20. Put the sf swr cap switch to CAL. Key the radio. With the radio keyed, turn the cal knob up until the meter is all the way to the right on the cal mark. with the radio still keyed, flip the switch to SWR. Where ever the needle falls is your swr reading. The top line is SWR. If it is above 3 this is really bad, and your antenna is no tuned and you are hurting your radio. You need to adjust the antenna length.

Turn to ch 1 and take an SWR reading the way I explained. Then do the same on ch 40. IF the SWR is lower on ch 1 then 40, your antenna is too short, make it longer. The antenna has a way of adjusting it. Usually the whip slides up or down in a colar.

If the swr is higher on ch 40 then 1, it is too long, and you need to make it shorter.

Keep making adjustments until the reading on 1 and 40 get lower, and are about the same.

Then check ch 20 again. It should be low, 1.5 or under. Then you are good to go.

you will find people hear you a lot better, way better then ever.

Jun 30, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cb radio


As for me ,the Wilson 1000 or Wilson 2000 are the best mobile antenna for a mobile. I have out talked a lot of base antennas with them, just put it on the top of car in the center or trunk, or middle of cab of truck, with a good SWR and you are talking and receiving. great antenna. ...hope this helps..

Jun 01, 2010 | Cobra 29 LTD CB Radio

1 Answer

Need instructions on how to swr my cobra 29 ltd bluetooth


You insert an SWR meter in the antenna line, usually one end goes into the Antenna OUT socket, and the Antenna plugs into the SWR meter, you then tune you antenna coupler, inductor, & final PA, in the final stage, until you achieve a 1:1 SWR reading, this is however quite hard to achieve, so simply tune for the closest 1:1 SWR that you can achieve.

Feb 22, 2010 | Cobra 29 LTD CB Radio

2 Answers

I have a cb radio in the car and one at home if i got out in car i get about a mile and then no one at home can hear me but they can hear others can you help


radios are very picky beasts, the first thing you should do to get more range out of them is have them tuned by a cb dealer, from factory they rarely get out very far. also for the one that goes in your car antenna placement is very critical since your car body affects how the signal travels. even the length of antenna cable has a effect. when you have them "tuned" many times they will clip a resistor or "limiter" inside the unit. if you look up cb modding, youll find pages with 100s of makes of cb's and learn what modding them means. also look into high gain antenna for your units, if you want really long range buy a linear antenna "illegal in a lot of places" but you will be heard! people have used high gain antenna, and "skip" to talk to people in other states and countrys. skip is when the radio signal "skips" across the uppter atmosphere and uses it like a really big antenna. a lot of truck stops will have a good selection of antennas because cb is still very popular amongst truck drivers. i hope this helps you out and leads you in the right direction. cb is almost a lost art now and its nice to see people that are interested in it. take care and good luck!!

Jan 15, 2010 | Maxon MCB-30 40-Channels Base CB Radio

2 Answers

Tunning the antenna on radio shack cb trc-447


After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna
applications.

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

Oct 10, 2009 | Radio Shack TRC-447 CB Radio

3 Answers

ANT lite coming on for the first time when you key up and will it hurt radio


The type of coax and antenna should not matter in this case. What that light is telling you is your SWR is above a safe working level. You need to tune your antenna using an external SWR/power meter. It may also mean that there could be a bad ground or a bad connector. You probably just need to tune it up. Anything below a 2.0 SWR is acceptable.

Jul 07, 2009 | Cobra 29 LTD CB Radio

2 Answers

High swr ch. 1- 5 and ch. 40 - 5


This is a common problem in CB's. You can either get the radio tuned properly or tune the antenna. Sometimes the CB will put out more power on a channel than is needed and this could end up in a damaged radio. You can get the radio tuned to prevent the RADIO from high SWR, or you can tune the ANTENNA so tha antenna will better suit your CB's power.

Hope this helps!

Jun 06, 2008 | Cobra 29 LTD CB Radio

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