20 Most Recent Cobra 29 Lx Full-featured Cb Radio Questions & Answers

pay and get it done right so the radio does not get destroyed.

Cobra 29 Lx... | Answered on Jan 17, 2019

i think it could be with the coax.try replacing the coax and the antenna and see what you get. make sure the antenna is adjustable with set screws.

Cobra 29 Lx... | Answered on Nov 25, 2014

your final could be blown,thus no transmit . if you change it make sure you change the driver also and retune that portion of the radio.

Cobra 29 Lx... | Answered on Nov 25, 2014

one of the few radios that won't allow you to turn up. the most you will get is 4.5 watts . if you want power buy yourself a 250 watt liner amp and leave the radio where it is . turn VR 4 up for max modulation and go for it.

Cobra 29 Lx... | Answered on Nov 25, 2014

variable inside radio not letting you.turn up the variable and the needle should come up also
check out vr 1 and set it for s-9 reading you may also try after to turn vr 2 and vr3 just a bit on both.

Cobra 29 Lx... | Answered on Nov 02, 2014

you cannot adjust the squelch without haveing a signal generator.Si vous plait.

Cobra 29 Lx... | Answered on Sep 11, 2014

you may have burnt the diode that a variable controls or you messed with it and burnt it out.

Cobra 29 Lx... | Answered on Aug 23, 2014

try a different mic.don't use a power mic,then use one see what happens then.

Cobra 29 Lx... | Answered on Jul 30, 2014

could be low modulation,low power,bad final any number of reasons. Look for it and you will find it.

Cobra 29 Lx... | Answered on Jul 30, 2014

first of all are you sure its a bad antenna. I can key the mic with no antenna hooked up and nothing will happen the the finals but you may key it down with a brand new antenna and burn them also.Lokk and see how they are connected in the radio before you take it out and replace it the same way.You may want to replace your driver also.

Cobra 29 Lx... | Answered on Jul 23, 2014

Sounds like bad SWR. Check antenna ground. If mag mount, make sure mag and whe you put it is very clean. Check antenna where whip comes in to coil or base. Check pl259 with vom for continuity, open or shorts. This will probably solve the problem. DO NOT TRANSMIT WITH HIGH SWR. YOU CAN BURN OUT POWER TRANSISTOR. HOPE IT HELPS.

Cobra 29 Lx... | Answered on Apr 27, 2014

There are plenty of places to run the ground wire to the board. The majority of the wide traces are ground traces. This can be repaired but you must know what is and is not a ground trace and how to connect broken traces if necessary. This is serious business when you talk about repairing the voltage input so be sure or get help if you don't know for certain what you are doing.

Cobra 29 Lx... | Answered on Nov 17, 2013

The SWR cannot be changed by rotating this knob. The SWR function allows you to determine the SWR or "match" of the antenna system and transmitter on a specific channel. The entire process must be performed whenever you want to know what the SWR is on a different channel. The SWR/CAL button toggles the meter between the CALIBRATE and SWR modes.
Set the radio to CH1. Press the SWR/CAL button. The radio CAL(ibrate) mode is now selected. Press and hold the mic PTT (or push to talk) button. Rotate the SWR knob as needed to adjust the meter indicator until it is on the SET mark on the dial. The meter is now calibrated for this channel.

While still holding down the mic PTT, press and release the S/RF SWR CAL button to the SWR setting to read the SWR on the meter.

This entire process should be done for Ch 20 and Ch 40. You must go through the CAL procedure for EACH channel before attempting to read the SWR.

Changing the SWR requires that the antenna be lengthened or shortened until such time that the SWR can be reduced no further. Typical SWR across the band may be:

CH1 - 1.5:1, CH20 - 1.1:1, CH40 1.5:1


CH1 - 2.2:1, CH20 - 1.7:1, CH40 2.3:1

The "dip" in SWR on CH20 is typical, as the antenna is the perfect length on only one channel - it will be come slightly too long or slightly too short as you tune up or down from CH20. The further away from CH20 you go, the poorer the SWR will be. You can "slide" the dip to any channel you prefer - say CH8. If you tune for lowest SWR on CH8, You might see CH1 with a 1.2:1 SWR, CH8 at 1.1:1 SWR and CH40 at 2.5:1. All are acceptable - sort of. Many manufacturers say up to 2.5:1 or even 3.0:1 matches are ok, There's no reason a quality antenna can't be tuned for optimum SWR in the middle of the band (CH20) to have less than a 2.0:1 SWR on CH1 or CH40, unless there is a ground issues or bad cable / antenna / connection somewhere.

You can view the manual here. I hope this helps & good luck!

Cobra 29 Lx... | Answered on Dec 03, 2012

That's a confusing question. Device id is the FCC device ID number and means it has been approved to transmit in the USA. It has nothing to do with model. So, in terms of a radio device, it means nothing to a tech or a way to get parts or even a battery. The device ID is typically located on the back of a radio or under the battery. Could you ask what you are looking for?

Cobra Radio... | Answered on Oct 04, 2019

Hi Anonymous, as you say, your batteries have little or almost no charge capacity
That's why the charger lights remain on
Simply replace the batteries.
I hope you can solve the problem
Greetings Franco Dosil

Hola Anonimo, por lo que comentas, tus baterias tienen poca o casi nula, capacidad de carga
Espor eso las luces del cargador permanecen prendidas
Simplemente, reemplaza las pilas
Espero puedas resolver el problema
Saludos Franco Dosil


Cobra Radio... | Answered on Sep 26, 2019

the issue is that this radio has an audio boost control function, Dynamike. That is likely the issue, the two are working against each other. You can see if the power mic you have will work if you dial the Dynamike all the way down, but you might have to live with the stock mike.

Cobra Radio... | Answered on Sep 24, 2019

What is the swr? This can impact the receiver. However, the tuning coils for receive and transmit are close to each other and someone most likely turned the receive coil instead of the transmit coil. The coils that are adjustable that affect receive are 13, 15 and 3. 3 is the coil that is close to the transmit section. You may want to have it realigned.

Cobra Radio... | Answered on Sep 13, 2019

If it "keys up" without a mic plugged in, try plugging the mic into the radio and see if it stops. Some radios require the mic to be plugged into it to operate properly. If it is keyed up with the mic plugged into it, try unplugging the mic and see if it stops. If it does stop when you unplug the mic, either the switch in the mic is stuck/went bad or there is a wire shorted in the mic cord to radio plug. Make sure pins 3 and 4 on the mic plug are not shorted. A continuity meter will tell you. If the mic is keyed, pins 3 and 4 will show a short, if the mic is not keyed, pins 3 and 4 should not show a short. If the mic is functioning normally but the radio is still keyed up then there is something in the radio that is shorted.

Cobra Radio... | Answered on Aug 29, 2019

Use scissors? .... please explain what you mean.

Cobra Radio... | Answered on Aug 25, 2019

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