Question about Cobra 29 LTD CB Radio

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I just purchased a Cobra 29 ltd classic. Trying to find the potentiometer vr4 but all pots are labeled r1, r2 ect. Which one is it on the newer radios. thanks

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Posted on Oct 03, 2010

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Cobra 29 LTD LX LE vr pots


vr1 "s" 9 setting on the tx meter vr2 voltage setting vr3 squelch vr4 amc vr5 p4 display on tx signal meter.

Mar 22, 2013 | Cobra 29 LTD CB Radio

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Unidenpc78elite modulation adjustment point


the uniden 78 series is like the COBRA 29 ltd not the cobra 25 . the pc 68xl is like the 25 ltd The Mod..adj point on the 78 is VR4 .

Jan 20, 2013 | Uniden PC78ELITE 40-Channels Base CB Radio

1 Answer

Cant find vr4 on my cobra 29 made in vietnam


With the covers removed and the front of the radio facing you with the component side up, You will see a transformer with yellow,blue or red colored tape around the center. VR4 is located to the left of that. If you still can't find it, then remove D11 to open up the audio.

Jun 20, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have installed a supermod on my radio clipped d11 and added varible pwr to the delta tune knob it worked fine for a couple of days the varible was touchy now it will key up but will not modulate. i...


  • Why would you cut d11 when you can adjust VR4 and have it sound so much better? When you cut d11 you put that modulation into overdrive. Put that diode back and adjust VR4 for 100% modulation. That is step one.
  • I assume you added variable power from J36. The problem with adding variable power and not switching the pot is that the wires not only have major loss, running to the pot. And two the stock potentiometer tend to burn up if not replaced with a potentiometer that adjust power by itself. Undo this so called "super mod."
  • Start with a 1969 final for better handling of power.
  • Adjust VR4 for 100% modulation.
  • You can pull the ferrite out of the pot next to the final transistor or you can remove j36 and add a 330uf capacitor (black stripe, negative) to the rear and bias the soldier side with a 33uf resistor. Soldier the resistor to the same soldier points of the Capacitor.
  • Adjust L14,L13 and L12 for power.

Regards, Tony

May 17, 2011 | Cobra 29 LTD CB Radio

1 Answer

Which way do i turn the VR4 pot on my cobra 29??


Clockwise FOR MAXIMUM AUDIO. Just turn it as far as it will go and there ya go!!!
"WILDCAT" IN LAURELVILLE OHIO
35 YEARS INTO THE CB WORLD!!!

Dec 29, 2010 | Cobra 29 LTD CB Radio

1 Answer

What is the number on the pot next to the final that i have to turn out?


Offhand the only "pot" near the final would be VR5, but that is used the S/RF meter. The other would be VR4 used to limit/increase modulation.

Jan 08, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 LTD CLASSIC C.B.


You should not cut the modulation diode, you should adjust the potentiometer VR-4 for full modulation. By cutting the diode, you risk over modulating. By turning up the pot, you can correct for an over modulation.

If you are still insistent on cutting the modulation limiter, it is D11, located directly in front of VR4 and C73. Looking at the radio from the front to back, it is in the right corner, apx 2 1/4" from the back and 2 3/8" from the right side.


Dean Pitts
Rollin CBs

Nov 17, 2008 | Radio Communications

2 Answers

Cobra 29 Ltd Classic


In most cases just turning up VR4 is more then enough. Replacing the final, tr14 with another transistor requires changing many more parts to get it to work.

With a new 29, there is no need to change the final. Just turn vr4 all the way up and you will see around 20 - 25 watts. L13 won't gain you a single watt. L12 will raise the dead key, and usually you want a lower dead key for good swing. L14 will gain you a few watts, but don't adjust this unless you have a watt meter. You turn it out to increase wattage, but too much will over bias the final and shorten its life.

You hook it to a watt meter with a dummy load. Then say a steady AHHHH into the mic while keyed. Turn the slug out until the needle stops going up, then back it down to where it stopped.

The easy thing to do, and you will be pleased is just to turn VR4 up. Now, Up is counter clockwise. Its a variable resistor, so the less resistance, the more modulation. So you want to turn the VR down.

that will be more then enough.

Sep 06, 2008 | Cobra 29 LTD CB Radio

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