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EASY TO BUILD ON ONE LARGE CIRCUIT BOARD.  THEY WERE VERY POPULAR AND ARE
STILL HEARD OFTEN ON THE AIR MORE THAN 50 YEARS LATER.  MULTIBAND
TRANSCEIVERS FOLLOWED, WITH A NUMBER OF 80 40 20 METER RIGS PRODUCED BY
NATIONAL THE NCX 3, SWAN THE SW 240 AND OTHERS.  IN TIME, ALL BAND
TRANSCEIVERS BECAME THE NORM.  THE FIRST COMBO IN NOVEMBER 1958, TO GREAT
FANFARE, COLLINS INTRODUCED THE LEGENDARY S LINE, CONSISTING OF THE 75S1
RECEIVER AND 32S1 TRANSMITTER, AS WELL AS A POWER SUPPLY AND OTHER
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ACCESSORIES.  THIS EQUIPMENT WAS UNIQUE IN THAT THE PTO, THE FREQUENCY
DETERMINING CIRCUIT IN THE RECEIVER, COULD CONTROL THE TRANSMIT FREQUENCY
AS WELL.  WITH THE FLIP OF A SWITCH, THE TWO RADIOS COULD BE TUNED
SEPARATELY, MAKING SPLIT FREQUENCY OPERATION A REALITY EARLY TRANSCEIVERS
WERE STILL INCAPABLE OF THIS FEAT.  OF COURSE, THE S LINE WAS DESIGNED FOR
SSB AND CW ONLY, WITH NO PROVISION FOR AM, BUT IT OFFERED A COMPROMISE TO
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