Question about Cobra 29 LTD CB Radio

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SWR high on hi and low chanels. Checked all connections.

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You may need to shorten the antenna slightly. If it remains the same even after shortening a significant amount- replace coax.

Posted on Feb 25, 2012

  • Tribe Ningo Apr 23, 2014

    check the continuity of your coax detached from back panel.if it has no resistance,try an end to end test.

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RE Cobra 29 lx camo cb antenna warning


get a frequency counter and check to make sure you are on frequency.reset your SWR Recheck the pll section and the frequencymake sure everything is soldered good ,no cold solder joints.Could be a bad crystal or a bad IC .Check for power ratings on the PLL. If they are good your radio should be ok

May 10, 2016 | Cobra Radio Communications

1 Answer

Swr on meter high, swr on 2547 low- which to believe?


how high or low . As long as its not in the red basically you are ok but how high on the radio and how low on the meter? the one to believe is up to you but I would believe the meter.

Jan 30, 2014 | Radio Communications

1 Answer

Low rf output checked driver and final checked ok and amp transistors check ok to


Have you checked the aerial? (antenna) often a power loss is due to problems in the plugs cables etc or high swr.

Jan 25, 2014 | Ranger RCI-2995DX Base Scanner

2 Answers

When I key my mike my antenna light comes on


Hi, my name is John. ..On some radio,s that is normal, however, Have your SWR checked to be sure. They can do this at Radio Shack for free or some CB shack.... hope this was helpful...

Aug 31, 2010 | Cobra 29 LTD CB Radio

1 Answer

I can hear people fine,but my volume to them is very low. i have checked the swr. when i key up the needle goes to 3


On some radio's that are bone stock with a stock mic you have to speak directly into the mic and not mumble;as for your swr if it's high on channel 1 and low on channel 40 you need to shorten your antenna if it's low on 1 and high on 40 you need to lengthen your antenna.Good Luck. Dan

Nov 30, 2009 | Radio Communications

1 Answer

Setting SWR


hi ken, SWR has nothing to do with your power supply, Standing wave ratio, It is the amount of power which is reflected back to the radio when transmitting, If you have a SWR of 10 or over on a wilson 5000 I would imagine you have a short in your feed line[coax].
I would replace the pl259 connector and check the coax for damage.
Paul,.

Sep 21, 2009 | Wilson Electronics Cellular Magnet Mount...

1 Answer

The ant light and the other light light up red when i key the kic


the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Sep 14, 2009 | Cobra 29 LTD CB Radio

1 Answer

Low TX PWR/ATU won`t tune. No SWR and ALC metwr reading?


You've replaced the pre driver, the drivers and finals. Set bias and still low output. The pre driver is the same transistor used as the tx exciter transistor on other pcb chassis on bottom of radio. Follow the gray coaxial wire from the pre driver on the RF circuit board back to the tx/rx i.f. Circuit board. The gray coax cable plugs right next to the tx exciter transistor on this pcb. Again it's on a different pcb all together and on the bottom of the radio and also. Replace it! And check for open bias or emitter to ground chip resistor next to it. You will get your drive back. Very few rigs have I seen the actual Finals blown in the mosfet or the bipolar version. Just the driver stage with a week pre driver and the SMT "pre" pre driver on the same RF pcb. And the tx exciter on the other pcb.

Apr 24, 2009 | Computers & Internet

2 Answers

Fresh install SWR will not come down


have you checked the coax connectors? It's gotta be a bad connector,damaged coax or a defective antenna. Careful--don't test "too much" or you'll burnout the final amp!

Dec 27, 2008 | Connex 3300 240-Channels Base CB Radio

1 Answer

Cobra 132 recieves good poor send


Poor send? Is your modulation ok?
The biggest hurdle for good coms is the antenna, placement and proper tuning will make or break your CB.
Check your SWR, if you can't check it then another way to get an idea is to use your power meter.
It will show more power when the SWR is high, check you high and low channels for increased deflection. High on channel 40 and low on channel one would mean antenna needs to be shorter and the opposite for channel one. A balanced reading or slightly lower reading in the midband channels would indicate antenna working near optimum.

Dec 06, 2008 | Cobra 29 LTD CB Radio

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