We used the Pac units in Nevada and they were are pain in the metro area. You would have multiple units arrive and activate their units. Pretty soon someone would key up thier portable and several cars would transmit together. It drove the dispatchers crazy. These units were made using a standard HT-220 radio chassis with a PL board and components to accomplish the task. Very Low tech design that worked well. CHP had a better design by far.
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Charles
"my day mainly consists of masking my contempt for the idiots in charge"
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