‰  NOW 30 WPM  ‰  TEXT IS FROM JANUARY 2016 QST  PAGE 39‰

MODIFIED BY REMOVING THE ANTENNA INDUCTOR AND INSTALLING A LOADING
CAPACITOR.  THERE IS A SIMPLER WAY.  WE CAN CONNECT A FIXED CAPACITANCE IN
PARALLEL WITH THE 50 ANTENNA LOAD, AS SEEN IN FIGURE 4, WHICH WILL
TRANSFORM THE LOAD INTO A LOWER RESISTANCE.  FOR EXAMPLE, 900 PF FOR 7 MHZ
AND 1800 PF FOR 3R5 MHZ WILL MAKE THE TRANSMITTER SEE ABOUT 10 IN SERIES
WITH ABOUT 1000 PF.  THIS IS A LOAD THE TRANSMITTER CAN FEED PROPERLY.  WE
NEED ONLY USE A FEW TURNS OF THE ANTENNA INDUCTANCE AND ADJUST THE ANTENNA
COUPLING FOR THE DESIRED POWER OUTPUT.  KEYING THE TRANSMITTER  WE MUST
DEVISE A SAFE WAY OF KEYING THE FINAL STAGE OF THE TRANSMITTER TO OPERATE
CW.  THE ORIGINAL METHOD KEYED THE HIGH VOLTAGES COMING FROM THE DYNAMOTOR
VIA A RELAY.  ITS SAFER TO KEY THE INTERNAL RELAYS VIA THE KEY CONNECTION
WHICH WORKS FOR RELATIVELY SLOW CW OPERATION.  OTHER OPTIONS INCLUDE USING
GRID BLOCK KEYING, BY APPLYING A HIGH BIAS TO THE GRID OF THE FINAL TUBE
AND KEYING IT ON AND OFF.  THE BC SERIES TRANSMITTERS BRING OUT A GRID
CONNECTION TO THE REAR PLUG THAT CAN BE USED, HOWEVER, THE ARC 5
TRANSMITTERS DO NOT.  BE AWARE OF THE SOCKET DIFFERENCES BETWEEN ARC AND BC
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ