Question about CB Radios

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Not receiving properly

My CB picks up better is the PL259 is only inserted, not screwed onto the back securely. The antenna is a trunk mount K-40. I have pulled the antenna off again, there is no broken coax. I also ran a ground wire from the mount to the chassis, but this did not help either.

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Pitcrew, does the noise go away when you screw the pl259 down tight? Find someone talking on a channel and do the PL test again and see if their signal disappears when you screw down the PL. Have you done an SWR test yet? Is this a fairly new antenna? If this problem came into my store, the first thing I'd do would be an swr test, the second would be to test with a volt/ohmeter from the center pin on the PL to the metal stinger to make sure there is a connection.Then check from the trunk mt to the outer ring of the PL for connection. Now, if you check from the center pin to the outer ring of the PL you should not have connection! If you do, the coax has a short in it,,,
Is this mounted on a trunk of a car? Sorry for all the questions, but there are so many different things it could be, and I'm just trying to narrow it down for you. Hope this helps some, let me know,,, Mechanic

Posted on Jan 31, 2008

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Sounds like high swr. If using a mag mount antenna; check for a proper ground by cleaning the antenna base and the place where you put the antenna. Any other antenna; check the place where the whip goes into the coil at base of the antenna. Make sure that antenna has good ground. Check continuity of the pl259. Make sure there is a good connection and no opens or shorts. Hope it helps.
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Sounds like bad SWR. Check antenna ground. If mag mount, make sure mag and whe you put it is very clean. Check antenna where whip comes in to coil or base. Check pl259 with vom for continuity, open or shorts. This will probably solve the problem. DO NOT TRANSMIT WITH HIGH SWR. YOU CAN BURN OUT POWER TRANSISTOR. HOPE IT HELPS.
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Swr on channel 1 and 40 are over 3, what can I do?


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.
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You cannot lower the SWR via the radio. it has to do with the antenna. The length of the antenna is essential to transmitting properly. It must match the transmitting frequency.

To check SWR tune to ch 20. Flip the meter switch to CAL. Key the radio without talking into the radio. Turn the CAL knob up until the meter needle is at the CAL mark. Unkey the mic. Flip the meter switch to SWR. key the radio again, and the meter will show your SWR. We already know it is high because you are getting antenna warning, but we will have a base line now to work on.

What you did was calibrate the meter for that channel. that is necessary to check the SWR. So you must calibrate for each channel you check.

You should at least be under 2 swr. Ideal is 1.5 or under. the lower the better.

If your SWR is high, your antenna is either too long or too short. To find out here is what you do:

Check the SWR on ch 1 and ch 40 calibrating for each channel. Compare the difference of the SWR between 1 and 40. If the SWR is higher on 40 then 1, your antenna is too long. If your SWR is higher on 1 then 40 your antenna is too short. All CB antennas have a way to adjust the length.

If its a mag mount, its usually a set screw you loosen to raise or lower the whip. Fiberglass antenna's usually have something under the cap at the tip to adjust. It will either be like the mag mount, with a set screw and a small rod to raise or lower it, or a screw, that you screw in or out to make it longer or shorter.

make small adjustments. 1/8th or a 1/4 of an inch at a time. Each time you make a change, take an SWR reading on 1 and 40 again and compare the difference. The difference should be getting less. Do this until there is very little or no difference between 1 and 40.

Then you go back to 20, because it is the center channel and check the SWR there. It should now be low. If you did a good job it will be under 1.5 and you are good to go.

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this could be alot of things but you never say what antenna you are using ,please check coax with multimetre for short,check pl259,it might just be the pl259 but check it out also if you are using a coil loaded antenna check for breakage along the coil goodluck

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with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

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