Question about Uniden PC78ELITE 40-Channels Base CB Radio

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Uniden pc 78 elite cb

Get no reception or transmission on cb.even the weather channels are silent.swr is at 3 bought new fiberglass antenna and coax but have not tried an external speaker.do not get any movement on meter while on 19 so am assuming im not receiving at all. the squelch does not static even all the way down.keying mic does make a sound in internal speaker . problems started after switching to cal to check swr but not sure if just coincidental.not sure if im calibrating correctly what do u suggest.

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I have receive but will not transmitt

Posted on Apr 18, 2008

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Hi, This is a link to your old post re SWR 3....http://www.fixya.com/support/t180697-pc78_elite_cb As stated SWR 3 is too high, it should be 1.5 or lower. Fiberglass antenna are kinda notorious in setup and experience wise have not performed well or at all. Maybe you should try a different antenna (metal rod). Some good brands/models I have tried with very good results are K40, Hokushin, Comet, Oscar, Maldol, Daiwa. To check if you can receive, stick an ordinay length of wire ('bout 9' long) at the center of your radio's connector. RX should work (pls don't key the mic or TX).

Posted on Aug 12, 2007

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1 Answer

Adjusted mag mount antenna w/a swr meter. When checked it w/the meter on the '06 uniden pc78 elite, ch 40 was a lot higher. Which is correct ?


The coax jumpers between the meter and the radio can change the SWR a little bit. It is very unlikely the the antenna can be that low on 1 and 40. Set it for the lowest on 20 via the radio and as long as you are under a 2 on 1 and 40 then it should be OK.

Oct 10, 2016 | Uniden Radio Communications

1 Answer

What antenna


If you cannot use a magnet mount antenna on the roof then a fiberglass antenna (top loaded) about 4 ft. tall mounted behind the cab on the bed rail.You can usually run the coax thru a rain drain hole in one corner of the bed. The antenna should be tall enough to where the top third of the antenna is above the roof. The taller the ant.is the better the SWR will tune.

Jan 20, 2014 | Uniden PRO520XL 40-Channels Base CB Radio

1 Answer

Uniden PC76XL and a 4' Firestik fiberglass weak respetion


above the rear window should be a tubular hold down handletry mounting it there.does this truck have a fiberglass body as others do? If it does try grounding the antenna to the chassis with some heavy duty wire maybe like 12 or 14 guage. I drive a ch650 and to switch trucks I have to check my SWR constantly and ground the antenna. you could turn the volume up a little too. SQuelch all the to the left and RF gain all the way to the right.

Feb 17, 2013 | Uniden Pc76xlw 40 Channel Cb

1 Answer

I have a Uniden PRO510XL radio and a 48" single


then the antenna needs to be moved. antennas have to have a ground plane to get correct swr below 3... or there may be a bad ground. try moving antenna @ different angles to see if it changes swr's or even opening the door away or closer to the body will make it change. also check the insulator it should be on top. call if you need help

Dec 22, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

2 Answers

Got it peaked and tuned and hooked up a new coax and mirror bracket and my swr is at 4. Before I did all this I had the stock coax and swr was under 2. What do I need to do to get the swr down?


The antenna needs to be tuned. The reason all of a sudden your SWR is a 4 when it used to be a 2 is, after a peak and tune, the radio is putting out more power, there for more RF energy is being reflected back into the radio. That is why the antenna has to be tuned.

It is important to tune your CB radio antenna to the proper length. The length must exactly match the wavelength of the frequency you transmit on. Or be really really close.

All Cb antenna's have a way to adjust the length of the antenna. If it's a mag mount, the metal whip can be slid in and out of a metal collar. Usually a set screw. If its a fiberglass whip, the way to tune it is on top. It either has a small metal rod with a set screw to adjust the length, or it threads in and out to adjust length.

Either type you have it will need to be adjusted for proper length. Here is how to tune the antenna to lowest SWR.

Some radios have a built in SWR meter. Some do not. If yours doesn't have an SWR meter, then you have to use an external SWR meter. Radio shack carries one, and you can find them cheap on ebay.

If you have a built in SWR meter or external, the procedure is the same:

1. Turn the radio to CH 20.(This is the center of the band.)
2. Switch the meter switch to CAL. (CAL stand for calibrate.
3. Key the radio. (Important. Do not talk while keying the radio.)
4. turn the CAL knob up until the meter hits the CAL mark.
5. Now while still keying the radio flip the meter switch to SWR.

Where the meter falls after that point is you SWR reading. If its above 3, that is real bad. 2 is not gonna kill your radio but its not the greatest. 1.5 and under is a good place to be, but the lower the better.

If your SWR is high, Here is how to find out if your antenna is too long or too short.

1. Turn to CH 1
2. Repeat SWR procedure. You must calibrate every time you do it.
3. Remember the SWR reading.
4. Turn to CH 40.
5. Again repeat SWR procedure.
6. Compare the reading between CH 1 and CH 40.

Now if the SWR is higher on channel 1 then channel 40 your antenna is too short. You must make it longer.

If the SWR is longer on channel 40 then on channel 1, then the antenna is too long, you need to make it shorter.

Make height adjustments about an eight inch at a time, and take reading each time.

once the SWR is significantly lower and the reading on channel 1 and 40 are about the same, you a about matched. At this point turn the radio to the center of the band, channel 20 and take an SWR reading.

You should now have a low SWR reading, 1.5 or under. If you are 1.5 or under, you are good to go.

If you cannot get the SWR to an appropriate level, there may be an antenna problem.

Nov 17, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cant get SWR below 3.5


A ground wire will not replace the lack of ground plane. Try a different antenna altogether (possibly one with a magnet mount) and mount it on some metal surface like even the front hood and retest.

I am sure the problem you will find is with the lack of a proper ground plane.

May 31, 2009 | Cobra 29 LTD CB Radio

2 Answers

Swr to hi and can t get it down


I hope this will help you on setting your swr put the radio on channel 1 check your swr.
now go to channel 40 check the swr. If the swr is lower on 1 than it is on 40 the antenna must be shortened buy 1/4 inch.until you reach your desired swr.if the swr is lower on 40 than it is on 1 the antenna must be lenthened by 1/4 inch until desired swr.

Mar 28, 2009 | Cobra 29 LTD CB Radio

2 Answers

Galaxy DX959 CB radio reception and broadcast


You Need to check and set you SWR on the antenna system. You may also have a bad coax or the ant studs ( mounting hardward ) for the antennas may be bad. It definally sounds like an ant/coax problem Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 08, 2007 | Cobra 18 WX ST II 40-Channels Base CB...

5 Answers

Matching Antenna, or ??????


If the antenna is tunable, you definitely need to start out by having the swr set properly on the antenna. Also, make sure the plastic ferrel, (the small round white piece) is between the top of the antenna bracked and the antenna itself. It is there to make sure the antenna does not ground out to the vehicle. If the antenna is grounding out, it will be like no antenna at all. I have also had a few customers that have had broken coaxes straight out of the factory package on cheaper antenna setups.

Dean
Rollin CBs

Feb 08, 2007 | Uniden Bearcat Pro PC78LTW 40-Channels...

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