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FROM BEHIND ENEMY LINES LUGGED COMPACT RADIO SETS THAT, WHILE CREATIVELY
CRAMMED INTO CONTAINERS THE SIZE OF A SMALL SUITCASE, MIGHT WEIGH MORE THAN
30 POUNDS.  BY AND LARGE, THESE PARASETS, WHICH OFTEN WERE DROPPED BY
PARACHUTE INTO ENEMY TERRITORY, EMPLOYED BULKY VACUUM TUBE TECHNOLOGY AND A
HIGH VOLTAGE POWER SUPPLY THAT REQUIRED POWER FROM THE AC MAINS, ALTHOUGH
SOME COULD BE POWERED FROM BATTERIES OR EVEN BY HAND CRANK OR BICYCLE
GENERATOR.  THE TRANSMITTERS WERE DEFINITELY IN THE QRP CATEGORY.
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FORTUNATELY, WORLD WAR II COINCIDED WITH A PERIOD OF RELATIVELY HIGH
SUNSPOT ACTIVITY.  THESE SETS WERE NOT TRANSCEIVERS, BUT SEPARATE RECEIVER
TRANSMITTER UNITS.  SOE OPERATIVES HAD TO AVOID DETECTION AT ALL COSTS THE
NAZIS ROUTINELY AND CAREFULLY MONITORED THE HF BANDS FOR ANY UNUSUAL
SIGNALS, AND HAD MOBILE TRACKING VEHICLES.  KATO NOT ONLY DESCRIBES THE
RADIO EQUIPMENT AND THE TACTICS OPERATORS USED, BUT HOW TO CONSTRUCT A
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