Copper Talk » Modifications » Radios » Cobra 25 and Cobra 29 Mod « Previous Next »

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Jubenjuld
New member
Username: Jubenjuld

Post Number: 2
Registered: 2-2005
Posted on Monday, February 14, 2005 - 12:19 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Can anyone tell me how to install the swing diode in either of these radios. I know its being done cause I have seen it work. The tech is installing them and there working just like the low key kit you would install with the cap and resistor. I did know which resistor to pull and add the diode, but forgot...any help would be great.
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Audiophile73
Member
Username: Audiophile73

Post Number: 54
Registered: 5-2004
Posted on Wednesday, February 16, 2005 - 4:53 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

just tune it how u want high or low dead key. Then open your modulation limiter up all the way. Copper has a list of modifications for both those radios.
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Bigbilly
New member
Username: Bigbilly

Post Number: 7
Registered: 2-2005
Posted on Friday, February 25, 2005 - 6:25 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Never trust a watt meter! Look at the modulation waveform on an O'scope with a "swing diode" installed. You will be dissapointed.

bigbilly
ke5bbc
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Inspector
Intermediate Member
Username: Inspector

Post Number: 132
Registered: 12-2001
Posted on Friday, February 25, 2005 - 7:29 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

These radios are different than the Galaxys, therefor a diode or NPC mod will not work. The best thing for these radios, is to replace the stock final with a 2sc1969 transistor and then add a variable output mod using a TIP120 darlington-transistor. You can then set the deadkey wherever you want and swing full power.

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