Question about Cobra 29 LTD CB Radio

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

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  • j205 Dec 30, 2010

    clockwise......k ill notice a change in the meter when i do this anyway right? so if i turn it the wrong way i will get less movement in the meter on the radio???



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Clockwise FOR MAXIMUM AUDIO. Just turn it as far as it will go and there ya go!!!

Posted on Dec 30, 2010

  • j205 Dec 30, 2010

    man some people say clockwise some say counter clockwise head hurts



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SOURCE: I just purchased a Cobra 29 ltd classic. Trying

Some time ago I had need for info. for a 149GTL Cora and went to this Email ad..............http// Good luck with you're research.

Posted on Oct 03, 2010

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Some time ago I had need for info. for a 149GTL Cora and went to this Email ad..............http// Good luck with you're research.

Oct 03, 2010 | Cobra 29 LTD CB Radio

2 Answers

I went to adjust the V4 pot on my Cobra 29 LTD Classic, and when i turned it the plastic screw broke off. The radio transmits fine, and was curious if it will hinder performance later on?

Let's see you wanted more modulation, so you twisted the VR4 pot so hard that it broke off . First, if the radio has been clipped, VR4 is not in use . FYI, I think that full Counter Clockwise is wide open . VR4 is a 680 ohm pot, but can read to 800 ohm . Most folks defeat the AMC circuit by removing D11, C73 will do the same . You may actually be better off by leaving the circuit intact, and changing C71 from a 220uf 10v to a 33uf - 47uf at 16v, or 25v, to 50v . This will make the AMC transistor react faster for cleaner operation . Set VR4 so that it just prevents severe over-modulation . If you want modulation that bad, change C42 to a 3300uf 16v - 25v . That will increase available power for your audio amp . Make sure that R48 is 220K Ohm . For swing, remove Jumper JP36, and install a 18 ohm to 100 ohm 1 watt resistor(higher number = lower dead key) in parallel with a 47uf to 100uf 50v cap . I use axial caps, if you can find them, and piggyback the resistor . Outherwise, it can be mounted on the botton of the board . Make certain that the negative lead of the cap is in the rear hole . Without an amp, I use 18 ohm, and 47uf at 50v . I also add a "short" jumper on the bottom of the board from the audio transformer base ground to the center grounded area of the board to prevent feed back . You just have to jump a few small traces . The center area is grounded, follow skinny the traces . The jumper just beefs up the ground . Well, I hope that satisfies your lust for modulation ! J

Oct 31, 2009 | 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 modulation problen

You need to check the modulation on a modulation meter. Just because the meter doesn't peg, doesn't mean the modulation isn't working. Usally a meter pegging, means the swr's are too high or the meter is misadjusted. If in fact the modulation is low, their is a pot inside the radio (VR4) that will add gain to the modulation circuit. This setting is legally supose to be set by a qualified technician.
Good Luck
Ed Meshechek ( Radio Man )
NC Electronics
PO Box 1696
414 6th St.
Mills, Wyoming

Nov 24, 2008 | Cobra 29 LTD CB Radio

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