Question about Uniden PRO510XL 40-Channels Base CB Radio

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Can hear everyone but they can't here me

Is this an antenna problem the antenna is touching the tire carrier. I had no problems when the antenna was on the roof, but that was a magnet antenna, this one is a whip.

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First you need to check your swr it should be a max of 3 to 3 or the unit will shut down the amplifier. if the antana is touching any metal it will thow the swr off if it is running paralell to metal on the vehical will also thow the swr off your bes bet is get it as hi as you can and as far from the body and assories of the vehical as you can.

Posted on Feb 22, 2009

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I have a Cobra 29ltd CB with no sound coming from the internal or external speakers. So I went out and bought another Cobra 29ltd thinking that the old one was shot. Hooked up the new one and the same...

are you using the antennas that are installed thru the mirrors or the ones on the side of the truck. If you are using them you should make sure that they are connected to the coax. some just get thrown together ,antenna to mount then one end of coax to ??? so take a multi meter and set it on x1.Touch bottom of the antenna and the connector that come out of the dash. If you are connected you should get a reading. If you are not ,then you will have a problem hearing anyone because you are not connected to the antenna but the coax. If the connection is good to go then I would try running a ground wire to the chassie and maybe even a ground strap.

Mar 09, 2013 | Radio Communications

2 Answers

Hooking up new antenna on jeep spare tire carrier, with a stud mount. drilled tire carrier, installed antenna, turn on radio and nothing. discovered post on stud mount can't touch tire carrier. I then...

CB radios are AM radios operating in the 27Mhz band and are prone to noise even in home installation (though admittedly not as much). A signal on the meter that causes the indicator to move up to as much as 1/4 of the scale is actually pretty good for a mobile installation with the engine running. There are ways to minimize the noise, but none will eliminate it. Here are suggestions - in no particular order:

1) A well grounded antenna. Since you've got metal to metal contact with yours it shouldn't be a problem - the magnetic mounts are more prone to interference and noise that yours.

2) Locate the antenna on a large, flat, horizontal, metal surface. Mobile installs are always a compromise - but the more of these you can incorporate, the better the reception & transmission will be. There will still be noise - but when you receive better signals the "S/N" or "signal to noise ratio" increases - making the sound less noisy.

3) Tune the antenna for lowest SWR (standing wave ratio). You'll need an SWR meter to do this. Be sure to get one that will tune HF antennas - or at least one that works in the 27Mhz band. This is another method of improving the S/N ratio mentioned above. An untuned antenna can cause a transmitter to fail - so this is a must for any transmitter's antenna.

4) Obtain the power directly from the battery. Not the accessory terminal or battery terminal under the dash - but to the battery posts themselves. This is the cleanest (power-wise) source in the vehicle.

5) Install filter on the power lines feeding the radio. A rising and falling (with engine RPM) whine sound is usually alternator noise, and a popping sound is ignition noise. The whine sound can be helped by install a capacitor and the ignition noise by using an inductor or coil. So, if you have both noises, you'll need both filters.

6) Install resistor spark plugs and wires. Years ago, we had to get these as an aftermarket item. I don't know if those supplied by auto manufacturers are resistor types or not - so it may be worthwhile to check it out.

Some vehicles benefit greatly from one or more of these solutions, others - not so much. Some vehicles have noisy subsystems unrelated to ignition or alternator. Some tank mounted fuel pumps can be brutally loud and difficult to silence (check with radio on, and turn the key to run - the fuel pump usually runs for a few seconds - listen for static while the pump runs before starting). The vehicles that will probably have good luck are those that you see used as police, taxi and ambulance vehicles due to the radios and electronics in them.

I hope this helps and good luck! Please rate my reply - thank you.

Mar 04, 2011 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

I can't get the swr value close to 1 it's over 3 what am i mising

Several things are working against you.
1 Antenna location= Needs to be in CENTER of car or truck, and high. no grounded metal can be next to the element (the hot/positve part of the antenna)

2 the only way to really ground the antenna is by having a flat metal ground plane under the antenna. DC grounding does NOT do this, that is a misunderstanding.

3 make sure you use a tunable antenna. I have found the wilson's to be very easy to tune and performe very well, for a base loaded antenna.

4 in short a wilson or k40 magnet mount placed on the very top of the roof in the center will have a perfect ground plane. Then shorten or lengthen the steel whip to ajust your SWR's. You will get the best results this way. This is the ONLY way to achevie good performace.

5 I will say this the absoulte best antenna is the 102"steel whip, if you got the clearnce and dont mind it hitting tree limbs put it on a big magnet mount with a spring at the base and youll have a perfect antenna. But the wilson is shorter and easier to tune.

May 15, 2010 | Cobra 29 LTD CB Radio

1 Answer

Can't pick any body up

If you do not hear static DO NOT ATTEMPT TO TALK !!!! Check that the RF gain, RF power is turned up and the squelch is turned down. You may have a problem with your antenna or coax. Make sure the antenna is wired to the radio. Start at the rear of the radio working all way to tip of your antenna, make sure all connections are tight, and that the positive and grounded side of the coax and antenna are not touching one another. the connector that connects the coax to the antenna has a positive center and grounded outside, make sure the grounged outside is not touching the positve element of the antenna. If all this checks out make sure you have matched the antenna to your vechile by checking and ajusting the SWR's. Make sure you have the antenna installed on a flat ground plane ideally the top and cener of the roof. Make sure no metal of the car is close to the driven element of the antenna.

May 11, 2010 | Cobra 29 LTD CB Radio

1 Answer

I listen my self on my car sound system when i transmit

its a fact of life when it comes to CB. Some times you will hear it over the radio if it is on. Happens with mine. There really is no way to solve it unless you replace all the speaker wire in the car with shielded wire.

You are sending out RF. When the AM modulation hits the speaker wires, the act like an antenna a bit. If there is any electrical signal in the wires, from the radio being on, even if the volume is low, and some times even down all the way, the signal in the wire coming from the radio acts like a carrier signal and causes the speaker to resonate to the modulation, giving you your voice on the speakers.

You can try running the power wire right to the battery, but its most likely coming from the antenna.

You probably will not ever be able to get rid of it.

Some cars it doesn't effect depending on the speaker wires, some it does.

I can say that a lot of people have their radio modded so that they can hear them selves over the radio when they talk. its called talk back. This way you can know how your audio sounds.

Think of it this way. You don't have to pay a tech to add this feature.

Mar 18, 2010 | Midland 1001Z 40-Channels Base 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

Can recieve but not transmit

The mic wires are soldered incorrectly. Get another cobra mic for that radio or have a qualified radio tech correct the wiring.

Apr 15, 2009 | Cobra 29 LTD CB Radio

1 Answer

Help me!!!

SWR OK? Is it throwing a dead-key carrier? No carrier? Midlands many times will show what looks like a processed modulation signal but is not going out your finals on the radio, and out the antenna. Suggest an external in-line meter to see if there really is a transmitted signal. If there is a signal, look for a broken/bad wire at the mics plug-in end. If no signal on the add-on meter, suspect an audio chip or final that's defective. All three are fixable at a GOOD CB Shop.

Dec 14, 2008 | Midland 4001 40-Channels Base CB Radio

1 Answer

Cant hear anyone

Is the squelch off? Is there even a crackle from the speaker? Does it appear to go into transmit?
If you have a friend can listen in while you try transmitting, get him to let you know if voice can be heard, or a carrier appears (on AM). If TX OK, try sideband, if OK, look for faulty speaker/ socket/ wiring. If no audio on TX, suspect the audio amp is bad.

May 15, 2008 | Cobra 19 DX 40-Channels Base CB Radio

1 Answer

On rx , i have a low carrier , sometimes cannot hear someone vs another radio

Depends on how it was modded? Were both the TX and RX broadbanded and tetuned?? Possibly poor work..

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

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