here what it states on site=
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.
