Question about Cobra 29 LTD CB Radio

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Bought a super dog swing kit 4 a 29 sound tracker. how hard is it to wire up. radio has been pecked and tuned

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  • Don Reiman May 11, 2010

    you wasted your money on a resistor and a capacitor. But since you already have it you might as well put it in. I believe this thing you bought is something shrink wrapped with 2 wires coming out. All you have to do usually is remove a jumper, JP36 and put this in its place. Make sure you follow the instructions that came with it, because one of the wires is positive and they other negative. the negative on faces the back of the radio. If you reverse it you could blow your radio.

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Remove JP36 and install the kit (if colored wires are used, red goes in the hole close to the final)

Polarity is important

Posted on Jan 30, 2010

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Sorry, the above is the solution

Posted on Oct 17, 2009

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I recently bought a Connex CX366CE. I plan to install a SLMM-1 SUPER MOD AND SWING POWER MODULATION kit. I plan to hook it to a Viper 25,000 watt antenna. Is this going to work? Do I need an antenna tuner...


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Uniden grannt xl will not transmit


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near final(without proper discharge 100 ohm resistor). I turned back power to 1 1/2 watts to 4 swing a Tx tuning slug *redpaint on it. I let it talk on low key an when i speak it jumps to 4 or 5 watts on meter. When a mod has been done some people don't know that capacitors discharge and it will leak back current. Thats why on a Cobra/Uniden company radio the instruction properly call for a 100 ohm resistor to be placed in parallel with Capacitor near final on bottom of circuit w/ capacitor on top spkr side(i call it top its on spkr side bottom when radio is upright (super mod kit). Or replace jumper J1 to factory deadkey of 4 watts and see no swing in talk except to 4.5 watt slightly(factory tune)

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Is it possible to convert the cobra 29 wx nw st sound tracker cb to 10 meter amateur band?


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Set to dead key a watt or so with a 100 watt amp it would dead key low and swing to 80 to 100 watts pep.(peak envelope power)

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Yes It could be the timing belt because as your car ages and the belt gets worn it starts to stretch. If your timing belt stretches enough your car will come out of time and that will cause a peck or knock. Another thing that you may look into if you have not had a tune up recently is spark plugs and wires. If you have worn plugs or wires it can also cause this to happen on occasion. I hope this helps you out.

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I have a DX929,with after-market upgrades including super Mod/swing kit 2w dead key swing to 37,Turbo echo Board ( Pro-trucker TRB1) it has a Mosfet final,it has Receiving an Mod. upgrades.My radio has...


Check Q37 (2SA473) a large TO 220 case style Transistor on the right side of the board when looking at the component side with the front of the radio facing you.
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1 Answer

Cobra 29 modulation modification


did you make sure the caps stripe is facing the back of the radio? If not, its the wrong way.

Also, don't use a 1/4 watt resistor because it will get too hot for it to last. use 1/8th.

changing the cap size will not change output, however it will change the tone. Bigger the cap, the deeper the tone of audio.

to be honest with you, high output mods are worthless in these radios. they are fine with out them. mosfets are unstable and are very dirty transmit finals. As well if you are planning to use a linear you may hit it too hard unless its a high drive, in which case you will need more then 35 watts swing to drive it fully. A stock cobra 29 that has been peaked and tuned, then the swing mod put in, 220uf e cap and 100 ohm resistor, which should give you about 2 watts, should swing to about 27 watts, and kick an amp in the pants.

I run a cobra 29 in my blazer with a dave made 5 pill, and I key on 6 pills and I near keyed on a 2x8. very close. All that I have done to the radio is peak and tune, (of course I have a few tricks with that up my sleave which I don't usually share with just any one.) and variable power, wich will control the dead key, which is basically a varible swing kit. I run it just under 2 watts, just enoug to get a 125 watt dead key out of the amp. The amps swings over 920 watts.

any more swing from the radio will beat up the pills in the amp.

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1 Answer

Cobra 29 classic "swing kit" ?


A swing kit is nothing more then a Cap and a resistor. There really isn't a different way to do a swing kit, unless you do variable power, which you don't need unless you are going to run a linear, and even then you can just set the dead key with a swing kit.

you need a watt meter, preferably one that reads peak and average watts. If not, average will be find.

Open the bottom cover of the radio. Hook the radio up to the watt meter, use a dummy load or have it hooked to the antenna. Never key the radio with an antenna or a dummy load.

Find VR4. Its toward the back right of the radio. Turn it all the way to the left. That increases your modulation.

Next find L14. it is at the back in front of the final resistor. While making a steady sound into the radio, just make an ahhhhhhh noise. Back the slug out of the tank until the needle hits peak. Don't move it out any more or you will over bias the final.

Now you will need a 220 uf electrolytic cap, and a 100 ohm 1/2 watt resistor, both of which you can get from radio shack. (this is your swing kit.

To the right of the tank slug is a jumper maked JP36. Us soldering wick to remove the solder and pull out the jumper. Now put the cap in it with the stripe facing the back of the radio.(that is very important. the other way you will blow the radio.) Solder it in place and cut the extra leads off. Now on the back of the board were you soldered in the cap, solder the 100 ohm resistor in between the 2 points.

The amount of resistance determines you dead key. you will be at about a 2 watt dead key which is good for swing and if you want to run a linear. The higher the resistor the lower the dead key, and the lower the cap, the higher the dead key.

That is your basic peak and tune with a swing kit.


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2 Answers

ONLY 2 WATTS DEAD KEY AFTER BEING PEEKED/TUNED AND MOD KIT.


it sound that a can has been set of balance, or the output  transister has crashed. did you up grade the output before ajusting for more output.

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