Question about Cobra 29 LTD CB Radio
It wil be the same for any 40 channel cb.. lower the bias and it will give it more swing. we make our own. for a cobra there are only 2 components. unless you want it a variable... and they only cost a few dollars to make. variables are little more because of the transistor and needing a way to control it. if you dont use an existing knob on the radio.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
SOURCE: 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.
Posted on Dec 23, 2009
Testimonial: "wow ! good info .......thnx"
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