=  NOW 40 WPM  =  
TUNED FOR USE WITH ANTENNAS HAVING A VOLTAGE STANDING WAVE RATIO
VSWR ABOVE 1R5 1.  IF THE VSWR IS BELOW 1R5 1, A BROADBAND MODE,
WHICH REQUIRED NO OPERATOR TUNING, COULD BE USED.  THE BROADBAND
TUNING FOR VACUUM TUBE ELECTRONICS WAS FIRST SEEN ON THE MID 1950S
CENTRAL ELECTRONICS VACUUM TUBE 100 V AND 200 V SSB TRANSMITTERS AND
THE 600L LINEAR AMPLIFIER.  THE TRANSCEIVER CIRCUITRY ANALOG
INTEGRATED CIRCUITS ICS MADE BY RCA WERE USED IN MANY PLACES IN THE
RECEIVER AND TRANS CLASSIC RADIO THE SIGNAL ONE CX 7 COMPLETE
STATION THE SIGNAL ONE CX 7 SEE FIGURES 1 AND 2 ALL IN ONE
TRANSCEIVER HAD MANY ACCESSORIES THAT COULD BE USED WITH A
TRANSCEIVER IN A WELL EQUIPPED AMATEUR RADIO STATION.  THE ONLY
COMMONLY USED ACCESSORIES MISSING FROM THE SIGNAL ONE WERE A LINEAR
AMPLIFIER AND AN ANTENNA TUNER.  THE SIGNAL ONE WAS FIRST ADVERTISED
IN QST IN 1969 FOR 1,595, BUT MOST INITIAL UNITS WERE DELIVERED IN
1970.  SIGNAL ONE BACKGROUND RICHARD EHRHORN, W4EA EX W4ETO, AND DON
FOWLER, W4YET, CREATED SIGNAL ONE.  SIGNAL ONE WAS INITIALLY LOCATED
IN SAINT PETERSBURG, FLORIDA, AND WAS A PART OF ELECTRONIC COMPUTER
INTERNATIONAL, WHICH WAS OWNED BY NATIONAL CASH REGISTER NCR
COMPANY.  INITIALLY, THE DEVELOPERS OF THE SIGNAL ONE CX 7 THOUGHT
IT HAD A BIG FUTURE IN GOVERNMENT AND MILITARY SERVICE, BUT THAT
ASPECT OF THE CX 7S APPEAL DID NOT PAN OUT.  THE CX 7 WAS UPGRADED
SEVERAL TIMES.  IT BECAME THE CX 7A AND THEN THE CX 7B SEE FIGURE 3.
LATER, IT BECAME THE CX 11 AND CAME WITH SEVEN SEGMENT LED READOUT
DEVICES DESIGNED INTO THE FREQUENCY COUNTER.  THE CX 11 VERSION COST
2,600, THEN ROSE TO 5,900.  IT WAS DISTRIBUTED BY PAYNE RADIO IN
SEPTEMBER 1974, BUT THEY DID NOT YET OWN THE SIGNAL ONE COMPANY, AS
THEY LATER DID.  CX 7 OPERATION THE SIGNAL ONE CX 7 OPERATED ON 160,
80/75, 40, 20, 15, AND 10 METERS, PLUS THREE OPTIONAL BANDS COULD BE
ADDED BY SUPPLYING OPTIONAL CRYSTALS.  THE RANGES WERE 2 4 MHZ, 4 7
MHZ, AND 8 18 MHZ.  THE CX 7 PREDATED THE ADDITION OF THE WORLD
ADMINISTRATIVE RADIO CONFERENCE WARC BANDS, SO IT DID NOT COVER
THEM.  THE SIGNAL ONE RAN 300 W PEAK ENVELOPE POWER PEP ON SSB AND
CW.  A SPEAKER WAS INCLUDED IN THE RADIO, AS WAS AN AC POWER SUPPLY,
OPERATING FROM 120 OR 240 V AC.  THE SIGNAL ONE CX 7 HAD MANY BUILT
IN ACCESSORIES.  FOR TRANSMITTING, THE CX 7 HAD A CW KEYER VARIABLE
FROM 5 TO 60 WORDS PER MINUTE, FULL BREAK IN CW OPERATION, A
TRANSMIT SPEECH COMPRESSOR TO INCREASE TALK POWER, AND BROADBAND
TRANSMITTER OPERATION WITH NO TUNE UP.  FOR RECEIVE OPERATION, IT
HAD A NOISE BLANKER, PASSBAND TUNING, INTERMEDIATE FREQUENCY IF
SHIFT, DIGITAL FREQUENCY READOUT, AND THE ABILITY TO RECEIVE ON TWO
DIFFERENT FREQUENCIES IN THE SAME BAND AT THE SAME TIME.  SPLIT
FREQUENCY AND DUAL RECEIVE THE FIRST MAJOR INNOVATION IN THE SIGNAL
ONE WAS THE USE OF TWO VFO ASSEMBLIES, WHICH GAVE THE CX 7 THE
ABILITY TO RECEIVE AND TRANSMIT ON TWO DIFFERENT FREQUENCIES IN THE
SAME BAND OR TO TRANSCEIVE ON ONE FREQUENCY.  THE VFOS EACH COVERED
A FULL 1 MHZ, SO 10 METERS WAS THE ONLY BAND COVERED WHERE THE
=  END OF 40 WPM TEXT  =  QST DE W1AW  <