Today we try the Racal PRM4700A VHF transceiver.
It is a very compact radio yet effective. The frequency Range is from 30MHz to 88MHz FM (F3E) or Data (FID). It has a power output up to 4W. It has 9 programmable channels that that support separate TX/RX split & 1 VFO type All channels are front panel programmable. Channel Spacing is25KHz.
It will run at 10V so be careful not to connect it to a 13.8 or 24V power supply. I am looking for some ancillaries, so if you know a source for a battery, a whip or even a pouch, please drop me a line.
I added some reverse polarity and in overvoltage protection using a common diode (3AMP) and a TVS bipolar diode rated at 12V placing it in pararell with the power line. Remember that the power cord must have a fuse on the positive side.
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