Question about CB Radios

1 Answer

Cobra 29 LTD CLASSIC C.B.

I'm looking to follow your directions in cutting the glass diode...I only see one that looks like glass. But, on the board it says D-12, not D-11. It's under a bunch of wires. and I don't see how to cut it. First, I need to know if that's it ?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 126 Answers

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

Posted on Nov 21, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How to change RF meter lite in cobra LTD 29 radio


It's a small bulb . There is a number on it. You may have to get a magnifying glass to read it. It is soldered in so removal will require a soldering iron of a low wattage.

Jun 20, 2015 | Cobra 29-LTD 29 LTD Classic CB Radio

1 Answer

Polarity protection diode d23 d28 classic


d-23,it should be the only diode in the area of the red and black wires

Jan 31, 2014 | Cobra ELECTRONICS 29-LTD Cb Radio - 29 Ltd...

1 Answer

How to check wiring inside a cobra 25 classic to determine if its made propperly


Yes, if you have a meter check resistance (like reading a fuse) with the radio off and power cord removed.

Only two of the three pins (look at power cord to see only two have metal in them) are used.

With power switch on front in off position there should be no reading across the + to - pins on the back of the radio.

If a short there the protect diode is shorted--likely first time it got hooked up backwards--easy to do.

Follow in this case the + pin on back just inside the radio and it goes directly to a diode. cut the diode if a short there and read again at the plug--if short gone replace the diode--radio will work without it but you will have no protection in that case.

6_3_2012_3_42_55_pm.jpg

Jun 02, 2012 | Cobra 29 LTD CB Radio

2 Answers

What type of diode was in d11 on the cobra 29 lts.. it was removed b4 i got the radio and id like to replace it


If it is the original 29 LTD, D11 is a IS2075K Diode. Attached is a section of the schematic showing the diode. Check the components connected to it to verify if they match those on the schematic section below. If they do, you should be fine installing the listed Diode. If they don't you may not have the model of Cobra 29 listed below.

11_24_2011_2_20_38_pm.jpg

Nov 24, 2011 | Cobra 29 LTD CB Radio

1 Answer

Radio cuts out occassionally...no transmit,no receive.if i tap bottom of it,it comes back for awhile.it's a cobra 29 ltd classic,has bigger finals and connex board installed.


Hi, my name is John. Welcome to FixYa. Take the cover off circuit board side, and with the eraser end of a pencil, touch around on the board trying to locate cold solder joints, have to look real closely and re-solder them....Thanks for choosing FixYa...John

Nov 21, 2010 | Cobra 29 LTD CB Radio

1 Answer

Not having aqny problems i am looking for


check this ....

http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm

Feb 16, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 nite watch hooked power wires up backwards witch diode is blown


there is a diode on the power line that blocks the dc to ground. follow pwr wires down to board. and the first diode on the + pwr is it. this is on all radios. and not just cbs. just put a new diode on the back side of the pwr plug. were the wires solder onto. but even better what we do @ our shop 254.718.4042 is use or make bridge rectifier install inline. and you will never have that problem either direction you plug it in. will work. no more worries about polarity.

Dec 15, 2009 | Cobra 29 LTD CB Radio

2 Answers

I have a Cobra 29 NW LTD Classic I have power going to radio but no power when i turn on knob. i have looked inside for a fuse but can not find one.


did you look for power comming out of your power switch....
dont tell me that you hooked it up backwards. if you did check the imput diodes

Aug 29, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 Ltd


Hi,

Appreciate the direct "Ask Me" again.

The initial posting would still hold true, best would be:
  • remove TR18;
  • replace 2SC2069 with 2SC1969; and
  • adjust L12, 13 & 14.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Sep 07, 2008 | Cobra 29 LTD CB Radio

Not finding what you are looking for?
CB Radios Logo

Related Topics:

456 people viewed this question

Ask a Question

Usually answered in minutes!

Top CB Radios Experts

AnyMHz.com
AnyMHz.com

Level 2 Expert

489 Answers

Iron
Iron

Level 3 Expert

3018 Answers

Steve

Level 3 Expert

3287 Answers

Are you a CB Radio Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...