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cobra 29 variable power

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Old 10-21-2012, 03:06 PM
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Default cobra 29 variable power


Hello everyone. I just did this mod on my older radio. The mod with the tip 120 transistor hooked to the rf gain pot. I know i did the mod correctly. But it's not working.. (so maybe i didn't look) it almost seems like it's not modulating. It's it possible the transformer is melted? Or is there anything people make Mistakes on while doing this mod?


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Old 10-21-2012, 04:16 PM
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Did you forget about this post?

Cobra 29 LTD Variable Power Mod
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Old 10-24-2012, 06:11 AM
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Is this a hard mod to do? I hear it's very necessary if you're going to be running any additional power.

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Old 10-24-2012, 05:08 PM
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If you can solder and de solder it's not hard. You also have to mount the transistor, which you can find on at radio shack. Pretty simple. I'm still debating if ilike out or not With the ekl

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Old 10-25-2012, 12:28 AM
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i have my rf gain wires soldered together i did the cbradiomag site trick i used a 470 uf cap and a 100 ohm res i get 0- 12 watt deadkey. very easy to set on RF gain var knob
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Old 10-25-2012, 06:09 AM
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Quote:
Originally Posted by rockytopcummins View Post
I hear it's very necessary if you're going to be running any additional power.

Not really...the dead key can be turned down to match the amp internally, the variable just makes it easier to do, but I find it also makes it easy to bump the power up and overdrive the amp if you not paying attention (read: don't have a meter in line).

My first Cobra 29 didn't have a variable, I just had the DK turned down and matched for the amp I was running...did the same for a Uniden Grant because I didn't want to hack it up to add a variable.

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Old 10-25-2012, 02:25 PM
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When you say match the amp input, do you mean 3 watts or its there a way to figure what each amp needs? Mine is slamming my amp.

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Old 10-25-2012, 03:44 PM
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Quote:
Originally Posted by 6string View Post
i have my rf gain wires soldered together i did the cbradiomag site trick i used a 470 uf cap and a 100 ohm res i get 0- 12 watt deadkey. very easy to set on RF gain var knob
Ouch, a 12 watt dead key? Most Cobra 29's work best with a variable range of say 1-6 watts. Whatever tech set that up for 12 watts on Hi did not know what he was doing.

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