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Silver eagle desk mic wired for cobra 29 ltd clasic

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  • 126 Answers

Straight from the Astatic wiring handbook:

WH - 2
SH & BL - 1
RED - 3
BK - 4
YEL - N/C


If you need anymore help, you can email me anytime.

Dean Pitts
Rollin CBs
dean@rollincb.com

Posted on Mar 06, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: cobra 29 ltd classic antenna calibration ??

Wow. That's not at all a solution to what this guy is asking. And why all the caps??

The one point jm77437 has that is correct is that you do not set the radio, you set the antenna. The rest is blah blah.

Here is how you tune your antenna for you radio. First off it depends on what kind of antenna you have. most fiberglass antennas have a tunable tip to adjust the height of the antenna. Metal whips either have a collar at the base that the whip will either slide up or down in to adjust the height. The other type of metal whip's you have to physically clip to shorten the antenna, you must be careful with this type because once its clipped, that's it. You cannot add what you cut off.

I am going to give this example using a metal whip with an adjustable collar.

First after your radio is hooked up in the vehicle, drive to an open lot. Buildings and other structures can cause extra reflection. turn to channel 1. Flip the meter to CAL. Key the mic without talking. Now turn the CAL knob up until the needle reaches the little upside down triangle all the way to the right marked CAL. Now you have just celebrated your radio for your setup to measure you SWR. Now while still holding the key, flip the meter switch to SWR. The needle will move, and where it stops is your SWR reading. The lower the better. Anything under 1.5 is considered really good. But still, the lower the better.

Make note of what your SWR was on ch 1.

Now flip to channel 40. Repeat the SWR process. You must recalabrate each time you take a reading.

Now like jm77437 said. If your SWR reading is higher on 40 then 1, then your antenna is too long, and you must make it shorter. Loosen the collar and lower the antenna in the collar 1/4 inch at a time. check the swr each time you adjust the antenna.

If your SWR reading is higher on channel 1, then your antenna is too short. You must make your antenna longer. Do this by loossening the collar and pulling the antenna upward in the collar 1/4 inch at a time, again checking the swr each time you adjust the antenna.

What you want to achieve is having the same SWR reading on channel 1 and 40. then you have the best match you are going to get with that antenna.

If your swr is under 1.5 on all channels, you don't need to fuss unless you are a perfectionist. then by all means go ahead.

If your reading is higher then 3, or your ant light comes on, something is really wrong. Make sure your antenna is connected all the way, and the coax is not damaged.

Its important to have an appropriate SWR because if you do not, you are reflecting too much signal back into the radio, and eventually you will burn out your final transistor, and your radio will be toast.

Some tips: make sure you check the swr with the doors and windows shut. Make sure you are in an open lot. Remember to calabrate ecah time you take a reading. If you have had your radio peaked by a radio shop, and they have lowered your dead key, or have done a swing modification, then the meter in your radio will not work when taking an SWR reading and you will have to use an external meter.

Posted on Apr 24, 2009

highspeedsan
  • 61 Answers

SOURCE: how to wire a power echo mic up theres 5 wires and 4 oins

I suggest buying a 5 pin to 4 pin adapter. Ebay has them for $6. I would go chopping wires on the mic. Cobra 29 ltd is a nice radio. Have one myself.

Posted on Apr 25, 2009

  • 22 Answers

SOURCE: I have a deisel 4-7 echo mic ineedcolor to pin to

cobra:black--ground
yellow--mic
red--tx
blue--rx
the wiring for the echo mic is identical

Posted on Sep 16, 2009

  • 219 Answers

SOURCE: 29 LTD CB Radio: whats the color to number wiring for cobra mic...

This is for a cobra CA50 mic
1-sheild
2-white
3-red
4-black

Posted on May 09, 2010

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Service manual 1990 American LTD by Cobra


  • Hi, I can help.

  • 1990 was still a front mic. Even the side mic cobra LTD from 1988 and before are the same exact wiring set up except the mic input is on the side.
  • Go to this link to download the manual free. http://www.mediafire.com/?bip1205nozcpu3o and click on "Click here to start download from MediaFire.." and the PDF will drop onto your PC.

  • If you have any questions about that 29 let me know.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

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29 LTD CB Radio: whats the color to number wiring for cobra mic...


This is for a cobra CA50 mic
1-sheild
2-white
3-red
4-black

May 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

29 ltd classic wont transmit


Hi,
Great radio when it works.
If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected.
If CB -is selected and still nothing - be sure you have a working mic. These wires are fragile and can break internally. One easy way to check is to borrow a cobra mic or even drop by a CB repair shop and ask them to do a mic check with the mic - it is free.

If you have a bad mic replace it and all should be well.
If your mic is good and it still doesn't transmit you will need to replace the finals in the unit. It is common that these burn out of you got too close to someone with too powerful a radio. The CB shop will need to look at it further and repairs should not be over about 40.00.

Good luck with your Cobra.

Mar 31, 2010 | Cobra 29 LTD CB Radio

1 Answer

My Cobra 29 LTD sometimes does not work even though the lights remain on. In other words I can't talk on it or hear anyone even though it appears to be operational


Your mic or mic jack is faulty. Try a different mic. In cobra 29's and some other variants, when you disconnect the mic, the audio is disabled. It will still receive, and transmit(possibly) but you will hear nothing from the radio.

It could be,
  • Broken wire on the back of the mic jack in the radio.
  • Broken wire in the mic cord.
  • Disconnected wires in the mic for the switch.
  • Dirty mic connection pins.
Most likely the problem is with the mic, and not the radio.

Oct 21, 2009 | Cobra 29 LTD CB Radio

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Where does the pin on a mic go to on a cobra 29 ltd


1/ shield 2/ audio (usually white,it's the wire the shield is wrapped around) 3/ red 4/ black if the radio transmits without keying the mic. switch # 3 and # 4.Good Luck

Apr 25, 2009 | Cobra 29 LTD CB Radio

1 Answer

How to wire a power echo mic up theres 5 wires and 4 oins


I suggest buying a 5 pin to 4 pin adapter. Ebay has them for $6. I would go chopping wires on the mic. Cobra 29 ltd is a nice radio. Have one myself.

Apr 25, 2009 | Cobra 29 LTD CB Radio

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