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PROTECTED AGAINST OUTPUT TRANSISTOR FAILURE IF THE ANTENNA VOLTAGE STANDING
WAVE RATIO VSWR WAS TOO HIGH.  IT USED A DIRECTIONAL COUPLER TO DETECT
EXCESSIVE REFLECTED POWER AND CIRCUITRY TO CUT DOWN THE DRIVE POWER TO
PREVENT DAMAGE TO THE MOTOROLA FINAL POWER OUTPUT TRANSISTOR.
MODIFICATIONS REGENCY MADE MANY VARIATIONS OF THE BASIC HR 2 DESIGN.  THEY
MADE VERY SIMILAR PRODUCTS FOR THE 220 MHZ AND 440 MHZ BANDS.  THE HR 6, A
SIMILAR RADIO IN A LARGER CABINET, WAS OFFERED FOR SALE AS A 6 METER FM
TRANSCEIVER.  REGENCY MADE RADIOS FOR A BASE STATION WITH THE ABILITY TO
SWITCH CRYSTAL FREQUENCIES FOR THE RECEIVER AND TRANSMITTER SEPARATELY, AS
THE HR 6 HAD.  THIS SEEMED LIKE AN IMPORTANT ABILITY BEFORE THE CHANNEL
ARRANGEMENTS FOR 2 METER AND 6 METER FM BECAME MUCH BETTER DEFINED.
REGENCY COMBINED THE IDEA OF A 2 METER FM TRANSCEIVER TRANSMITTER RECEIVER
IN REALITY AND THE SCANNING RECEIVER FOR PUBLIC SERVICE MONITORING TO
CREATE A 2 METER RADIO THAT SCANNED FOR ACTIVITY ON THE SELECTED CHANNELS.
TODAY, TRANSMITTING ON 146R16 MHZ AND RECEIVING ON 146R88 MHZ IS NOT VERY
POPULAR, BUT MANUFACTURERS IN THE EARLY 1970S WANTED TO OFFER THE OPTION.
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