I got a bunch of 25's and 29's from a small trucking company owner that retired and parts were missing in every...single...one.... They still "worked" (using that term loosely here) but man someone butchered the radios, like a CB horror movie.
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Negative Peak Compression boards for Cobra 29
- Thread starter FredTx63
- Start date
I got a bunch of 25's and 29's from a small trucking company owner that retired and parts were missing in every...single...one.... They still "worked" (using that term loosely here) but man someone butchered the radios, like a CB horror movie.
Shadetree Mechanic
Delaware Base Station 808
Found it, the real NPC for the 29.
https://www.worldwidedx.com/threads...ubed-solid-state-etc-any-high-level-tx.86832/
https://www.worldwidedx.com/threads...ubed-solid-state-etc-any-high-level-tx.86832/
Shadetree Mechanic
Delaware Base Station 808
This is from the listing, just putting it here for reference.
Cobra 29 Variable Power Control Negative Peak Compression
This listing is for 2 boards.
Simple SMD (Surface Mount Device) board, boosts peak and average power compared to old super modulator kits.
Adjustable board mounted variable resistor allows Dead key adjustment.
Prevents/Reduces Over modulation negative peaks. Old school Super Modulator kits would allow Negative Peaks to drop to ZERO watts output. This causes a loss of average power, and higher distortion levels of your transmitting modulation.
NO electrolytic capacitor that could result in power loss because of ESR (Equivalent Series Resistance). This is how other variable power kits can cause you to loose peak power once installed.
Uses Power Metal Oxide Technology to give the highest possible peak power output.
Bonus: Instructions on how to use variable control in front of radio, for adjustable dead key. It's designed into the SMD board!
Simple three wire hook up.
Drill a mounting hole, hook up three wires, and it works.
This may be a less expensive modification that has similarities to asymmetrical modulation. You may even consider it negative peak compression.
Although this board may adapt to multiple AM model CB radios, instructions only included for Cobra 29 CB radios.
Comes with Mounting screws and brass stand off.
Cobra 29 Variable Power Control Negative Peak Compression
This listing is for 2 boards.
Simple SMD (Surface Mount Device) board, boosts peak and average power compared to old super modulator kits.
Adjustable board mounted variable resistor allows Dead key adjustment.
Prevents/Reduces Over modulation negative peaks. Old school Super Modulator kits would allow Negative Peaks to drop to ZERO watts output. This causes a loss of average power, and higher distortion levels of your transmitting modulation.
NO electrolytic capacitor that could result in power loss because of ESR (Equivalent Series Resistance). This is how other variable power kits can cause you to loose peak power once installed.
Uses Power Metal Oxide Technology to give the highest possible peak power output.
Bonus: Instructions on how to use variable control in front of radio, for adjustable dead key. It's designed into the SMD board!
Simple three wire hook up.
Drill a mounting hole, hook up three wires, and it works.
This may be a less expensive modification that has similarities to asymmetrical modulation. You may even consider it negative peak compression.
Although this board may adapt to multiple AM model CB radios, instructions only included for Cobra 29 CB radios.
Comes with Mounting screws and brass stand off.
Dollars to Doughnuts, those "Q's" are not transistors
More like power routing, current steering devices - can be used as clippers and switches...
Including Audio...
Only need one power device to route the Variable Carrier power.
Barrier diodes are another term they use...
More like power routing, current steering devices - can be used as clippers and switches...
Including Audio...
Only need one power device to route the Variable Carrier power.
Barrier diodes are another term they use...
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I guess the pre-scratched ones are best. Probably tested by quality control at the plant in China. Like getting the test target and once fired brass with your new rifle.
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Shadetree Mechanic
Delaware Base Station 808
Just relisted with this update in the description:
This may be the last time these are listed. After review, of fees and rule changes more intrusive demands, I would like to refrain from listing here in the future. Contact information will be provided with order. I suggest buying only one unit.
This may be the last time these are listed. After review, of fees and rule changes more intrusive demands, I would like to refrain from listing here in the future. Contact information will be provided with order. I suggest buying only one unit.
Shadetree Mechanic
Delaware Base Station 808
Even though all the knocks on it here, it's good to see someone trying to produce something. I went ahead and got one to try out.
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Shadetree Mechanic
Delaware Base Station 808
Looks like there is a ground wire pad next to the mounting hole that wasn't on the earlier version.
A bit expensive to hook up to my Cobra 29 LOL.