Hi Don, The quick answer is no yes no. The long answer is, On the low band Compa-Station the output power control Board samples the VSWR on the output and folds back, the gain of the pre-driver in the power amplifier when the VSWR gets too high compared to the current draw of the final transistors. On a low bay and mobile. The antenna matching board is used to adjust the VSWR on the output and there is a directional coupler that you can attach a test set meter to. But there is no feedback to the power amplifier. The power amplifier has a thermocouple which is located on the heatsink, that is connected to a relay that shorts out a winding in the coupling transformer between the driver and a final transistors. Thus reducing the drive to the final transistors when the heatsink gets too hot.
The VHF Compa-Station and mobile radios use the same circuitry. Which is a directional coupler on a power control Board that samples VSWR on the output port and folds back the gain of the pre-driver in the power amplifier when the VSWR compared to the current draw of the final transistors gets to high. UHF Compa station and mobile radios use the same system, but wired a little differently. They sample the return of loss on the isolation port of the circulator and compare it to the current draw of the final transistors of power amplifier. If the return loss on the isolation port of the circulator gets too high compared to the current draw of the finals. The power control Board, folds back the gain on the predriver of the power amplifier chain. Gregory AC6VJ --- In Repeater-Builder@yahoogroups.com, "Don" <[EMAIL PROTECTED]> wrote: > > On the Motorola Micor Unified Chassis type repeater can anyone please > tell me if the Power Control Module is the same thing I would also find > in a Micor Mobile Radio? > > Thanks Don > > KA9QJG >
