Question about Cobra 29 LTD CB Radio

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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 looked and the only thing i saw out of ordinary was the trace on the solder side were i put the resistor for the super mod has raised a bit. any advice?

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  • 3,018 Answers

  • 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

Posted on May 18, 2011

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11_24_2011_2_20_38_pm.jpg

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Audi Delta CC Radio

tdisline_914.jpg
Please perform the following procedures while the car is parked. Otherwise you risk getting into an accident while your attention is not focused on the driving. Entering anti-theft code The following is the procedure to re-activate the radio if the display shows "SAFE". It is important that the procedure be followed in the correct order.
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Cobra 29 delta tune


For normal operation, set this control to the center position.
This feature has several uses and can help receiver operation.
If a received signal is slightly off frequency, the Delta-Tune control can be used to òfine-tuneó your receiver. Fine tuning is accomplished by listening for a more readable signal at the speaker or by noting the Smeter reading when the Delta-Tune control is operated. Another use of this control is eliminating adjacent interference (bleed over from other channels). If an exceptionally high level signal from an adjacent channel is creating interference on the channel being used, the Delta-Tune can be used to minimize or eliminate the interference. Rotate the control until you obtain minimum adjacent channel interference. NOTE: Delta-Tune is operable only in the receive mode.

It doesn't actually help receive any better, just can help kinda like a clairifier.

Dean Pitts
Rollin CBs
Mt. Vernon, TX

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