CP-1 Compressor Now the same Top Gun Modulator MD-1 and Compressor CP-1 circuits used in the new Magnum radios are available for most other 10-meterand many CB radios. Full tone, clear, high swing audio (AM) modulation is achieved with the addition of these two fully assembled micro circuitboards. While the Top Gun Modulator works only in AM, the Top Gun Compressor works in AM, FM, and SSB keeping the modulation at peak performance in all these modes. Installation is accomplished with the removal of up to 3 resistors and the connection of 7 to 9 pre stripped and tinned wires. Instructions are included for current and past production compatible radios. Additional Web support is available at www.TopGunTec.com. These circuits work with or without the modulation limiter. For the purest, the limiter can be adjusted for excellent forward swing without any square wave audio. Without the limiter the compressor maintains high-level audio without severe squaring of the audio signal. It is the squaringof the audio peaks that create the distortion and splatter of adjacent frequencies. On 30-50 Watt radios, the dead-key or carrier can be set to 1 Watt or less with a modulation swing to the full output potential of the radio transmitter. The modulator can be switched to normal swing with the installation of an optional SPST or SPDT switch. Even in the normal swingmode, the Top Gun Modulator is still working to keep the audio clean at all power levels.