20 Most Recent Cobra 29 LTD CB Radio Questions & Answers

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

d23 a 1n4004 diode second component from pa speaker port inside radio has failed. It is most likely that neg/pos polarity has been switched shorting this diode. It is there to protect your radio from reverse polarity as so it is names the "protection diode." 2 solutions first not recommended.

1. Cut the diode this will stop the directed grounding that is continuing to blow your fuse.
2. Go get a pack of 1n4004 and rosin core silver solder from radio shack and replace it paying attention to the direction it is installed.

just a side note the solder trace often burns in this area so a jumper wire soldered in around this bad area solder side maybe needed.

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!!!

This is not a user-accessible function. You would need to take the radio to a qualified repair person, i.e., a CB repair shop If the radio power output is 4-watts or less, as measured by an accurate wattmeter connected to a dummy load, then there is no need (from a legal perspective) for reducing it.

YOU CAN ORDER THAT PART FROM COBRA ELECTRONICS ON THE INTERNET YOU HAVE TO REMOVE THE FACEPLATE AND UN HOOK THE DRIVET INSIDE THE RADIO IT LOOKS LIKE A SMALL RIBBON CABLE THAT GOES TO THE FACEPLATE. SOME TIMES THE DRIVER ITSELF IS THE PROBLEM. MANY SHOPS JUST DO NOT WANT TO FIX THEM BUT I DO.

simple,just chech the input resistance and out put...they should have even small resistance always example .5ohms .3 ohms it counts...

1) violet 2) blue 3 ) shield 4) yellow 5) grnd Violet inside the mic is the power wire . Blue and yellow are the internal and external speakers. the other wires are to the antenna

You said that you can hear everybody and then you said all you can hear is static. Which is it?

If you can hear everybody and you have switched to a known good mike, then you either have a bad antenna or you have a bad final amplifier caused by a bad antenna or by having transmitted at sometime without an antenna at all.

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Check speaker and plug external one in if you have it.

swap mic could be a broke wire or bad switch in handset.

check antenna and coax connections.

i know checks sound basic but they could save you a lot of headaches later

would need to know the mic wire code you going to use. but half moon cut out at top as you look at it is top left 1-4 next row left side 2-3. 1 is cable/ unshield (common). 2 is MOD 3 is TX 4is RX... 1 is wire with no cover 2 is with cover rapped round wire RX is received TX is transmit, hope this helps. newer mic have different code wires so check with meter, red green and blue and shield is on some of the new wiring.

Try a hand mic with the set, there may be a short within the radio.If not your problem is with the audio amp in the radio itself.Repair should be about $15.00.

not sure what the numbers are but you change out the detector diodes.

First, make sure that the CAL/SWR/RF switch is set to CAL. If you still can't move the needle, check the RF output. If the needle moves to the far right, you at least have output power, and something is wrong with the SWR circuitry. Does the needle move with incoming signals?? If the needle doesn't move, then you either have a damaged meter. If the needle moves on rec eived signals but not when you transmit and the switch is set to RF, then you most likely have a damaged transmitter output stage.

Look , I don't speak a forign language but I can get what you are saying . ford rangers from 1993 to 2003 should all have interchangeable parts ,Mine does.

The problem may be in the audio output chip mounted on the chassis, also! there is also a small capacitor located next to the audio chip that has known to be a problem, finally sub the speaker for another, often a source of trouble.

if the antenna warning indicator is lighting during transmission then the antenna is either located and.or installed improperly or a defect exists in the antenna mount or the feedline itself, including connectors.