Question about Radio Communications
Radio is a used Cobra 19 Ultra 2 wired into a 12v lighter plug, coax is 18' amazon grade, antenna is a firestik 4', and its mounted to the bed of my truck. I don't receive any static even with the volume on high and the squelch all the way down. I can receive transmission but it is quiet even when volume is cranked up. Transmitting just broadcasts a squeal to other radios. Best SWR I have gotten is 1.2 on 1 and 2.2 on 40 with the firestik tip adjusted as low as it will go. the closest I have gotten SWR to be is about 3.2 on 1 and 3.4 on 40 with the tip extended. I have checked ground between the cable sheath, mount, and truck bed and the continuity is great (0.001). Beyond upgrading to a new in box radio and/or upgrading all of the wiring I don't know what to do. Any thoughts? EDIT:(I drove around town last night with the cb on and sometimes when hitting a bump I would hear a blast of static. Tapping on the bottom of the radio while on resulted in the same static for a moment.)
Based on your post of no transmit, a couple of possibilities:
1. defective microphone or cord or PTT switch (the red TX light does not come on when pressed);
2. TX light comes on but no output, defective finals and/or drivers. These are the transistors screwed to the chassis of the radio very near the antenna terminal;
3. defective regulator IC that provides the TX B+;
5. insufficient amperage from you power supply;
6. too high SWR.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Feb 16, 2008
SOURCE: Have Cobra 29 LTD CB
Sounds like the PLL circuit....... no channel synthesizer will kill the transmit and receive...... bad crystal or IC could be at fault or if someone has attempted to add more channels could also be cause.
Posted on Dec 22, 2008
SOURCE: static noise in my cb radio
A lot of times the "static" Is actually a loos connection in the microphone or a dirty micke gain control. Radio shack sells a cheap tuner cleaner if you know how to take the covers of and find the mic gain control, spray it in the little slot in the control( be generous) move the knob back anf forth several times. Also if you have another mike wired for cobra, try it and see if it helps. Those two solutions fix 98 percent of the problems. If it doesn't, please let me know. I am very good with cobra radioes and am sure we can solve this problem.
Good Luck. If this so;ution helps, please rate me.
Posted on Jan 31, 2009
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Check your ground wire and by your post I gather that you are user some form of headphone device, I say this because normally the speaker is off when the microphone is keyed. I would also check the controls on the headset if you are using one.
I hope this helps,
Oct 16, 2007 | Cobra 19 DX IV CB Radio
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