Question about Cobra 29 LTD CB Radio

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Got a 29 ltd works fine but i put a mod kit in it works fine and took the the to wires off the rf gain and put tham to the mod kit so i would have v pwr it works good the only thing now is its got a hum i can put my habd on it and it stops i tight the board idk what to can u help

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It shouldn't hum... all it is, is a resistor and capacitor. if you need it to be variable,, use a transistor in place of the resistor.. there are no power connections to it, to cause a hum.. there must have been a wire you moved or not installed correctly..

Posted on Mar 29, 2011

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1 Answer

Cobra 29 ltd classic year 2004. rf gain problems.


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try it on a base station antenna and see if it still happens. If it does it should be under warrenty so send it back and get another .

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Rf gain on a cobra 29 is the same as on any other radio. When you turn the knob all the way to the right the RF increases to draw in signals that are far away nut if you turn it to the left only the nearest stations will be picked up.

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How to adjust the rf gain on a cobra 29


there is a knob on the front of the radio the says RF GAIN. Turn it all the way to the right and you RF GAIN is at its max

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1 Answer

I have expanded my 25 ltd and want a rx/tx fine tune possibly using the rf gain control?


look at a schematic of a 29ltd to do that.. the 25 does'nt have it in there easily.. the 29 can be fixed to change tx/rx freq. with the delta tune

Feb 11, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

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I turn on my cobra 29LTD BT and theres is no RF gain nose what so ever. I put a new coax on and still nothing. The RF gain is alll the way up.The RF gain comes and gose.


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Jan 03, 2011 | Cobra 29 LTD CB Radio

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This is a complicated modification. I have never done it to a 1000 GTL, but its done basically the same in all radio's.

I don't recommend doing it, especially since I am not 100% sure on how exactly to do it. I have never been in a 1000 gtl. If I had one in front of me I could tell you for sure how to do it.

If the reason for Variable power is a linear, just a swing kit in for the dead key you need, most likely 2 watts, and leave it.

Here is how to do a variable power mod. this is assuming the swing mod is done the same to this as a cobra 25/29 or uniden 68/76 etc.

If you would like to try it, here it is.

You get a TIP31 transistor, Radioshack has them.

Where you put the swing mod in the radio, which is a cap and a resistor, you put the TIP31 and cap. A 47uf cap works fine.

With the resistor facing you, and the tab in the back away, solder the cap to the transistor. the leg with the black stripe goes on the right most leg. then the other goes to the center leg of the transistor.

Solder a wire on the left most leg, long enough to reach the front of the radio. Now solder the 2 legs that don't have the wire on it, in the place where you would put the swing kit, with the black stripe on the cap facing the back of the radio usually.

Remove the wires from the RF gain and solder them together.

Now solder the wire from the transistor to the center tab.

Remove VR6 and solder a wire from the top tag of the RF gain to the top connection of VR6 that you removed.

Then connect a wire from the bottom tag to a ground point. The side of a tuning can works fine.

Take a piece of shrink tube and put it over the TIP31 so it does not ground against the heat sink, that would be bad.

This is done basically the same in all cb radio's.


Apr 07, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 29 ltd classic


make shure that the rf gain on the front of the radio is turned up. if you have another mike that you can use on the radio.If the mike has a wire that has broke at the mike connector the speaker will not turn on when you unkey the radio.

Mar 12, 2009 | Cobra 29 LTD CB Radio

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