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Cobra 19 DX IV CB Radio - Page 6 Questions & Answers
Truck almost dies when mic is keyed
Hello stews78bronc,
First I want you to do one thing; disconnect the antenna cable and measure the resistance from the antenna connector center conductor of the cable to ground using the Rx1 setting on an Ohmmeter, you should have infinite resistance (no meter deflection). If you do have some deflection you have a shorted antenna and you have to have it replaced or repaired. There should be no connectivity of the center conductor to ground. This is what this problem sounds like. Don't key the mic with the antenna disconnected because this can damage the final stage RF power amplifier.
The antenna should be installed with a non-conductive washer between the antenna and the ground plane screw.
I hope this helps,
Thank you,
Shuttle83
http://www.electron-age-technologies-llc.com
My radio is down...
First check the fuse if it is blown replace it.If the new fuse blows then you will have to replace a diode. which is located just inside of the radio where the power leads solder to the board.Replace the diode and that should fix your radio.
Receiving fine but transmitting bad??
First off, that radio will not transmit very well anyways. but for just off roading it should suffice. You really should adjust your antenna's both of you. First off this is almost definitely the problem if you can recieve but not send. Also if you use the radio without a properly adjusted antenna it will destroy the radio over time, sometimes instantly. pick up a cheap SWR meter and follow these steps:
Plug the SWR meter into the radio, and the antenna.
Start on channel 1, the meter should have a switch with 2 settings, one for adjustments and one for reading. Key up (hold down talk button on mic) with the switch in adjust mode and adjust the knob until it reaches the adjustment marker.
flip the switch to reading and key up again.
Your goal is to get this reading as close to 1.1 as possible, anything above a 2.0 will damage your radio.
if the reading is within range repeat for channels 20 and 40.
good luck!
Static and Recieving Problem
make sure people are talking on the channel it may be no one is talking . the static tells you it is receiving something. the cobra 19 and sister radio magnum sold at wallyworld are notorious for having bad solder joints on their boards.
Turning it up
Make sure your antenna is hooked up properly.Find a friend who has a cb radio and see if you are getting out on your radio to him if not get repair center to check the finals or micaphone
Coax ends
Hello kewball,
You can buy the PL-259 connector at radio shack (Here is a link to the instruction on how to put a PL-259 connector back on):
http://www.stu-offroad.com/misc/rfconn.htm
I hope this helps
Thank you,
Shuttle83
Cobra 19 DX IV CB Radio Gets no signal at all
my only idea is the frequency that Canadians transmit/recieve on is different than us down south (in the USA). I know Europe and the UK use a different frequency range so my guess is that Canada uses a different radio frequency range than the U.S. making you unable to communicate with fellow radio users. You may be able to search the frequency range for Canada vs. the U.S. and see if there's a difference. Hope this helps...and again, it's just a thought.
Montana, USA
Cobra 19 DX IV
No, those radios are good radios. I have one just for setting swrs on antennas.
First, I went back and read your last question. You said you have a nylon washer on top AND bottom? Did you mean one under on the top and bottom side of the antenna mount? You only need theone on the top of the antenna mount, which stops the antenna itself from being grounded out. Having one on the underside stops the outter part of the stud, the one that touches the outer screw on part of the coax from being grounded. Without that getting a good ground, you have no groundplane, which will cut your tx/rx to a max of 2 miles. Also, how close is the two setups. Many times, if two vehicles are setting next to each other, you will not receive or transmit properly, just get a nasty garbled with a hint of a squeal.
If this doesn't help, please reply here or shoot me an email at:
[email protected]
Dean Pitts
Rollin CBs
Mt. Vernon, TX
CB transmission
Hello 64driver,
Make sure the radio is grounded properly and that the SWR is around 1.2:1, 1.3:1 is good but try to get it to 1.2:1. Also take a power output reading while keying the mic. To do this with your power meter put it in-line with the CB and your antenna and key the mic you should get about 4 to 5 watts PEP. If this is the case your unit is putting out the proper power level, if not have the power amplifier checked by a qualified repair shop.
I hope this helps
Shuttle83
Cobra 19 dx lv
Sounds as though you may have a poor or bad antennas system. I would suggest to check the antenna match ( SWR, Standing Wave Ratio) and if it's good, you might think about a better antenna. Good Luck
Ed
NC Electronic
Mills, Wyoming
I have a Cobra classic 29zLtd.. When you key the mic needle moves a little to the right. When ur close to someone they can hear you when a few links apart they can't .
A manual link is at the bottom of this entry. Troubleshoot the problems you've described:
Meter Not Working:
The needle moving slightly to the right when you key the mic could be due to incorrect calibration. Make sure to recalibrate the meter according to the manual instructions. If you calibrated it differently, that might cause the needle to go against the right side of the meter.
Recalibrating the meter should resolve this issue.
Meter Light Problems:
If the meter light isn't working, consider replacing the LED. Sometimes, a burnt signal meter light can occur. Replacing the LED should fix this.
SWR Meter Not Working:
Incorrect SWR calibration or bumping the calibrated knob might cause the SWR meter to malfunction.
To check the SWR meter:
Turn on the SWR calibrate knob until it keys up all the way at the end.
Switch to SWR mode and key the mic.
If the needle barely moves, turn down the Dynamike knob.
Finally, switch back to S/RF mode.
No Receiving Audio:
If you're not receiving audio, check the following:
Ensure the squelch knob is adjusted correctly. Start with the knob counterclockwise and turn it slowly clockwise until white noise stops.
Verify that the microphone is working properly. You can try a different mic to rule out any mic-related issues.
Make sure the radio is on the correct channel for transmitting and receiving.
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Calibrating the SWR (Standing Wave Ratio) meter on your Cobra Classic 29zLtd CB radio is essential for optimal antenna performance. Follow these steps to calibrate it properly:
Prepare the Setup:
Park your vehicle at least 20 feet away from trees and buildings.
Close all doors, hood, and trunk.
Choose the Channel:
Select the channel you want to check. It's recommended to test on channels 1, 20, and 40.
SWR Calibration:
On the radio, press the SWR/CAL button until the display shows "CAL."
While pressing the transmit button on the microphone, turn the SWR CAL knob (the last knob on the right) until the meter needle aligns with the "CAL" mark.
Release the transmit button.
Switch to SWR Mode:
Push the SWR/CAL button again until the display shows "SWR."
Read the SWR:
Press the transmit button on the microphone.
Observe the SWR reading on the top scale of the meter.
Ideally, the SWR should be below 3. Lower values are better.
Remember that SWR is a measure of antenna performance, and poor SWR can be caused by the antenna, antenna cable, or installation. Adjust the antenna length to achieve similar SWR readings on channels 1 and 40 while keeping it below 3. Most antennas are adjustable; refer to the manufacturer's instructions for specific adjustments.
cobra-29ltdclassic-cb-radio-user-manual.pdf (roadtrucker.com) MANUAL
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