Question about Cobra 29 LTD CB Radio

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I can hear people talking, but they can't hear me, or they say I sound like an alien

I have replaced the Mic, 3 of them, I have replaced the antennas, also 3 of them, 2 different radios, different connections, and 1 other vehicle. What on earth is going on here? I can hear the people talking.... Sadly, I just have to listen, .............................or talk to myself! Please Help!?!
Susie

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Check to see if the meter needle is swinging backwards when you key up. If it does your final may be bad. If the needle goes forward and others say they see your keying up but no sound your audio chip may be bad; especially if you have tried so many mics and antennas. If your radio has a swr warning light and it comes on this could extremely limit your range and others may not hear you and contiued use will damage your radio. Good luck!!!

Posted on Aug 08, 2008

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Posted on Jan 02, 2017

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1 Answer

I pulled u uhf out of my vehicle and replaced it with a pro 520 xl uniden uhf but it won't work.


Check your electrical connections and your antenna set up first. Then if you still have a problem, check your mic/mic plug. Lastly, check your programming. If you have ignition sense programmed into the radio you will need to wire it accordingly, so it will sense the ignition of the vehicle.

Best regards.

Sep 13, 2013 | Motorola UHF 1-Watt, 1-channel Radio

1 Answer

It has a great dead key but when I key up you can barely hear me talk. even with he mic gain turned all the way up


  • Hi, I can help.

  • If you have confirmed your dead key being "great" the the two things that can be causing your problem is a faulty mic, mic wiring, mic connector (either on the CB i=or the mic connector itself.
  • Have you tried a different mic?

  • The other thing would be a bad antenna, antenna connection, SWR.
  • Have you tried a different antenna? Checked your SWR (with an inline meter)? Make sure the antenna connector (PL259) and the connector for the antenna on your CB (SO239) are in good condition and that there are no cold soldier joints.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thanks for using FixYa.

Regards, Tony

Sep 14, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have cobra cb that is connect to 2 whip antennas in the box of my pickup, and everytime i talk to someone they say im really fuzzy and cant understand me and i cant figure out the problem


First, determine if the sound is related to audio - or signal.

Have someone listen to your AM radio transmission nearby. With an un-modulated carrier, the signal should sound clear. If there is noise on the signal, try with a different mic. If no mic is available, key up the radio by shorting the PTT pins on the jack on the radio itself (this will remove the mic element from the circuit - effectively disabling any audio noise entering from the mic cable or element. If the noise disappears or is significantly reduced, the problem lies with the mic, cable or connections at the mic plug or the inside the hand help portion.

If there is no problem in the above test - then the trouble can be a result of the signal. Signal issues are more pronounced when there is more space between your transmitter and the other person's receiver. If they are close to each other, it will be difficult to hear problems. Things that can affect signal quality - and noise can be: 1) vehicle electrical systems. See if there is a noticeable difference with your signal compared when transmitting with the engine on and engine off. Fuel pumps can be a source of noise, as can ignition noise, alternator whine, etc. A "choke input" filter or a large value microfarad capacitor rated at more than 15 VDC installed between + and - wires can help mitigate these noise sources - but it is unlikely that either will eliminate it. 2) power wiring. Always get power directly from the battery. This is the cleanest source of power available in the truck. You can interrupt the 12+ line with a relay that is controlled by the accessory terminal if you want the radio to shut off when the ignition key is removed it you wish - but resist the urge to use the accessory terminal to power the radio directly. 3) Antenna issues. Dual antenna installations require 75 ohm coaxial cable (co-phase harness) to perform properly. These can be as simple as pinched coaxial cables to improperly tuned antennas. Damaged cables need to be replaced. High quality, low loss, 75 ohm coaxial cable is required for the demands placed on it in mobile situations. Tuning for the lowest SWR or VSWR is a necessity from effective power transfer from the radio and antenna coax to the radiator or antenna. A detailed description of how to can be found here. Be sure to keep in mind the last sentence in the article regarding co-phased antennas: Adjust BOTH antennas to keep them in balance.

Hopefully, one or more of these suggestions will help solve or reduce the problem you've got. Good luck!

Jun 21, 2011 | Cobra Radio Communications

1 Answer

Poor radio reception.I've tried a new aerial mast,no improvement. CD player sounds fine. Any ideas? (Passat Est.2003)


Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 1 Subject: Model(s): Group: Number: Date: AM Radio, Poor Reception 1999, 2000 91 99--07 New Golf, New Jetta, Aug. 2, 1999 New Beetle, Passat Condition AM reception is poor. May be caused by: ? An incorrect antenna mast installed for the antenna base equipped with the vehicle ? Poor ground at the antenna base or radio ? Poor battery ground to chassis or engine ? Poor antenna cable connection at Radio ? Corrosion at the antenna coaxial connectors at radio or antenna Service Vehicles are equipped with either a Bosch or a Clarion antenna base mounted on the roof and (for shipping purposes) the appropriate matching mast is located in the luggage compartment. If radio antenna masts are removed from vehicles and stored until vehicles are sold, there is a chance that an incorrect mast can be installed at the time of delivery. Note: Mismatched antenna mast and base will cause poor AM radio reception. The antenna base and mast can be identified visually as follows: (Cont. on Page 2)91-A260 requires gloss finish antenna mast 57mm 49mm Bosch 91-A261 requires matte finish antenna mast 61mm 41mm Clarion 91-A262 Technical Bulletin Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 2 Bosch antenna ? Base (although oval) is more circular in shape (approx. 57mm x 49mm). ? Made in Germany stamped on underside of base. ? Two screws on underside of base are unpainted. ? Requires gloss finish antenna mast. Clarion antenna ? Base is more oval in shape than Bosch (approx. 61mm x 41mm). ? Two screws on underside of base are painted. ? Requires matte finish antenna mast. If antenna mast matches the antenna base correctly: -- Check antenna coaxial cable connections --arrows-- for corrosion and clean if necessary (DO NOT apply stabilant). Passat coaxial cable connection for radio is under the carpet on right side of tunnel near shifter. -- Ensure that coaxial cable is firmly seated in radio (Passat cable connection, see previous step). -- Check ground at the antenna below roof Nut --4-- (torque = 7+1 Nm) must firmly secure antenna to roof). (Cont. on Page 3)Technical Bulletin Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 3 -- Check ground for radio behind radio on cross member (On Passat models as of Nov. 1998 beginning VIN: XE285000 ground for radio is on right side of center tunnel). -- Check engine compartment ground, left side, below battery tray; frombattery GND to body. -- Check engine/transmission ground on transmission, near engine block. -- If all grounds and antenna mast are OK. -- Replace antenna and coaxial cable assembly

May 06, 2011 | Car Audio & Video

1 Answer

I have a magnum s 3 was working fine comes on lights up recives great talk back and neddle swings but will not transmitt hears fine will not say a word whats wrong


There may be 3 solutions. First, is the "dynamic" or mic volume set too low? Also, there may be a problem with the SWR (Short Wave Radio) settings which is most likely an antenna problem. Also, but less likely is the mic plug is loose or corroded. Try buying a new set of antennas and checking the antenna connections all the way through the vehicle and changing the mic volume settings.

Dec 19, 2010 | Magnum Radio Communications

1 Answer

29 LTD CB Radio: Calibrate cb radio...


The CAL is to calibrate meter for reading SWR (standing wave ratio) which is reflected power when transmitting back to receiver(radio) from antenna system.
This CAL switch position when selected and mic keyed uses the CAL knob to align the meter needle with inverted red triangle next to cal on meter. Then when you select SWR switch position meter will display accurately when mic is keyed for that channel. Now notice the difference when you go between channels 1 and 40. The ant led light will act as idiot light if it is not lit then you are most likely safe to transmit.
I say system because your vehicle, antenna and coaxial cable are all part of this system. When you have a high reading and have to trim you antenna this is really calibrating the antenna to the vehicles body which acts as a ground plane.

May 16, 2010 | Cobra 29 LTD CB Radio

2 Answers

Tunning the antenna on radio shack cb trc-447


After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna
applications.

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

Oct 10, 2009 | Radio Shack TRC-447 CB Radio

2 Answers

When i key up the mike the tx/rx light and the ant


your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

1 Answer

Mic hum


Yes, the wiring is different. Reverse the wires on pins 1 & 2, then reverse the wires on pins 3 & 4.

The wiring for you radio's mike is:

1- Audio
2-Ground (Shield)
3-Receive
4-Transmit

Depending on the vintage of your mike, the colors Uniden uses for these functions are white or yellow for audio, red is transmit & black is receive.

Jul 31, 2008 | Superstar SS-121 120-Channels Base CB...

2 Answers

"squeak" when transmitting


Make sure you have a good ground for the radio and antenna. How long is the antenna coax if a little to long and you have extra what did you do with it coil it if so uncoil it and lay it out try it. If no luck I would shorten the coax and recheck your SWR.

Jun 22, 2007 | Midland 1001Z 40-Channels Base CB Radio

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