Copper Talk » Ask The Tech » Modifications » Coba 29 LTD classic (old style) variable power mod « Previous Next »

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Cm3885
Posted on Monday, December 22, 2003 - 12:56 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Like to know how to,add a variable pot to my 29 so i can dial down my carrier?
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Cm3885
Posted on Monday, December 22, 2003 - 9:07 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Can anyone help me on this mod????
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Tech8541
Posted on Monday, December 22, 2003 - 10:04 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

cm3885,

if you go to any of the search engines and type this in, you'll find many sites that just don't tell you how to do it, but also show you. just follow the instructions carefully or you will burn up the variable pot that you use.

don't think that i don't want to tell you how, its just that this mod is in so many places in better ways than i can tell you.
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Inspector
Posted on Tuesday, December 23, 2003 - 3:41 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

To save the life of the potentiometer (usualy the delta tune or simmilar "useless" control) folow the instructions you find that add a new transistor. The transistor isolates the high current from the pot, thus saving it from a short life.
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Cm3885
Posted on Tuesday, December 23, 2003 - 7:57 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

OK will do..
Thanks guys!!!
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Boxcar
Posted on Thursday, January 08, 2004 - 10:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Cm3885, have you heard of a jp6 mod for a cobra 29ltd classic? I have the specs around here somewhere but what you do is throw in a capacitor and resistor by the back final and you can bring your carrier down to a 1/2 watt and it takes nothing away from the swing. Opens it up big time. It's also a lot nicer to run an amp with the carrier so low too. Let me know if you're interested and I'll try and find those specs in my books somewhere. I seen this on a website about 4 years ago and did the same mod on a cobra 25NW and it did the same thing.

Boxcar
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Crafter
Posted on Friday, January 09, 2004 - 1:04 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hey Boxcar I'm interested in the jp6 mod.
kc5djb@yahoo.com
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Johnhenre
Posted on Monday, January 12, 2004 - 12:42 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

BOX CAR IF THIS WILL WORK ON A 29LTD CLASSIC (NEW)I WOULD LIKE THE INFROMATION AISO, workmanb@bellsouth.net
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Boxcar
Posted on Tuesday, January 13, 2004 - 10:22 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Crafter, Johnhenre

I just sent you both an email on those mods.

-BoXCaR-
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Crafter
Posted on Wednesday, January 14, 2004 - 9:19 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks I got it.
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Cm3885
Posted on Friday, January 23, 2004 - 1:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Boxcar im interested...
heres my email addy.
eaz1993@hotmail.com
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Cm3885
Posted on Friday, January 23, 2004 - 1:37 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

In regards to that mod can you make the carrier say key up about 3 watts? I like to run my radios at 3 watts and let them swing from there.
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Boxcar
Posted on Wednesday, January 28, 2004 - 10:21 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hey Cm3885,
I'll send that email with those mods on it to you!! And yes you can change the resistor value for the desired dead key. I'll send............
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Cm3885
Intermediate Member
Username: Cm3885

Post Number: 241
Registered: 12-2003
Posted on Saturday, March 06, 2004 - 11:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Got the mods done!! TY they work well!!!

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