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Talk back on Cobra 29LTD Classic

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Beachbum24
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Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Wednesday, 18 July 2018, 6:49 AM

Hey all, I have a Cobra 29LTD Classic SN:607316425 (Made in China) and have been trying to figure out why i have no sound. I do hear the speaker pop when i turn power on and off. So i know that works. Plus when i key the mic and speak, i can hear myself from the speaker. So i'm guessing it's in talk back mode. But there is NO talk back switch or knob. So how do i get out of this mode?


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Re: Talk back on Cobra 29LTD Classic

Post by jessejamesdallas » Wednesday, 18 July 2018, 7:06 AM

Unless someone added talk back, that radio does not have " talk-back" ...and even if it did, that's not how talk-back works...you should still be able to hear static and people talking even with talk-back turned on.

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Beachbum24
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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Wednesday, 18 July 2018, 7:13 AM

Well i guess i have a problem then, because i don't hear people or static. Needle does move when i key the mic. Would a bad swr keep me from hearing anything. Or is that mostly effect the tx side.


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Re: Talk back on Cobra 29LTD Classic

Post by 295 antenna » Wednesday, 18 July 2018, 7:15 AM

Talkback on the 29 ltd is done by connecting the external speaker to the pa via a resistor or potentiometer so start looking there. This should not affect your transmit except if its not done correctly your radio might squeal on transmit {feedback)


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Re: Talk back on Cobra 29LTD Classic

Post by 295 antenna » Wednesday, 18 July 2018, 7:16 AM

Swr is mostly tx you can recieve on a coat hanger


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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Wednesday, 18 July 2018, 7:34 AM

295 antenna wrote:
Wednesday, 18 July 2018, 7:16 AM
Swr is mostly tx you can recieve on a coat hanger
I guess i could try talking on my DX959 and see if i can hear myself on the 29ltd, and try the opposite


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Re: Talk back on Cobra 29LTD Classic

Post by 295 antenna » Wednesday, 18 July 2018, 7:40 AM

yep thats what i would do


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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Wednesday, 18 July 2018, 7:49 AM

295 antenna wrote:
Wednesday, 18 July 2018, 7:40 AM
yep thats what i would do
Now i'm really confused. I can tx on the 29 and hear myself on my 959, and tx on the 959 and hear on the 29. But i hear no static or anything on any channel.


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Re: Talk back on Cobra 29LTD Classic

Post by jessejamesdallas » Wednesday, 18 July 2018, 14:48 PM

Beachbum24 wrote:
Wednesday, 18 July 2018, 7:49 AM
295 antenna wrote:
Wednesday, 18 July 2018, 7:40 AM
yep thats what i would do
Now i'm really confused. I can tx on the 29 and hear myself on my 959, and tx on the 959 and hear on the 29. But i hear no static or anything on any channel.
Check your squelch knob and make sure it's turned all the way to the left.... :mrgreen:


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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Wednesday, 18 July 2018, 16:51 PM

jessejamesdallas wrote:
Wednesday, 18 July 2018, 14:48 PM
Beachbum24 wrote:
Wednesday, 18 July 2018, 7:49 AM
295 antenna wrote:
Wednesday, 18 July 2018, 7:40 AM
yep thats what i would do
Now i'm really confused. I can tx on the 29 and hear myself on my 959, and tx on the 959 and hear on the 29. But i hear no static or anything on any channel.
Check your squelch knob and make sure it's turned all the way to the left.... :mrgreen:
Trust me, that's one of the first things i checked.


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Re: Talk back on Cobra 29LTD Classic

Post by jessejamesdallas » Wednesday, 18 July 2018, 18:31 PM

Beachbum24 wrote:
Wednesday, 18 July 2018, 16:51 PM
jessejamesdallas wrote:
Wednesday, 18 July 2018, 14:48 PM
Beachbum24 wrote:
Wednesday, 18 July 2018, 7:49 AM
295 antenna wrote:
Wednesday, 18 July 2018, 7:40 AM
yep thats what i would do
Now i'm really confused. I can tx on the 29 and hear myself on my 959, and tx on the 959 and hear on the 29. But i hear no static or anything on any channel.
Check your squelch knob and make sure it's turned all the way to the left.... :mrgreen:
Trust me, that's one of the first things i checked.
Figured you did...But you would be surprised at how many people don't! :whistle:


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Beachbum24
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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Thursday, 19 July 2018, 9:36 AM

Think i found the problem. For some reason the RF Gain has to be turned all the way up. Which makes me want to check the swr. And the knobs them self seem sticky, or maybe dirty is more the word. All except the Delta tune knob, that i replaced with new. So i'll clean the knobs and see what happens. Just hope i don't have to change them all.


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Re: Talk back on Cobra 29LTD Classic

Post by sonoma » Thursday, 19 July 2018, 13:56 PM

the RF gain has to be turned to the right as far as it goes to receive as the radio was intended. the rf gain is mainly used to cut out close people talking or to help cut out some of the static noise. you said for some reason it has to be turned to the right as far as it goes. that tells me the RF gain is working as it should. there is not a problem with it.
you never did say what your swr is. if the coax is shorted it will kill your RX also.
when the radio is workin g right and you can hear people talking you can reach up and grab a hold of the antenna and kill your signal some.



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Beachbum24
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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Thursday, 19 July 2018, 15:16 PM

Thanks, that's good to know about the RF gain. On my DX959 i keep it right in the middle. If i remember the swr was around 1.5 When i get my on/off switch installed i'll give you a update. Changing the RF gain switch also. It needs it


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Re: Talk back on Cobra 29LTD Classic

Post by Blue Ox2 » Thursday, 19 July 2018, 16:46 PM

That was a great bunch of information in that last topic.
Sure a bunch of good stuff to know.

One of thre biggest things I see when getting any used radio is to a complete, nuts and bolts cleaning of the rig.
the dirts and spills and dust and cooties hurts any of dem older rigs to no end.

73 ya'll. Have a great weekend and prayers you can find some good bargins in the yard sales and auctions.

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Beachbum24
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Re: Talk back on Cobra 29LTD Classic

Post by Beachbum24 » Thursday, 19 July 2018, 18:15 PM

UPDATE


Ok guys, so I re-placed the volume control, RF gain and the Delta tune control. everything seems to be working fine. Now when i adjust the volume,there's no clicks or static. Now just have to clean up my desk a bit.


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