‰  NOW 13 WPM  ‰  TEXT IS FROM APRIL 2017 QST  PAGE 63  ‰

YOU MUST MAKE SURE THE COLLECTOR TAB DOESNT CREATE A SHORT CIRCUIT TO THE
HEATSINK.  IN ADDITION, THE DESIGN INCLUDES A TEMPERATURE FEEDBACK CIRCUIT
THAT RELIES UPON A DIODE THAT IS ATTACHED TO THE OPPOSITE SIDE OF THE
HEATSINK.  YOU HAVE TO PERFORM A BIT OF SURGERY ON A RING TERMINAL TO ALLOW
IT TO GRASP THE DIODE FIRMLY AND TRANSFER THE HEAT.  THE TRICK INVOLVES
OPENING THE TERMINALS WIRE HOLDER WITH A PAIR OF NEEDLE NOSE PLIERS,
INSERTING THE DIODE, AND THEN APPLYING JUST ENOUGH PRESSURE TO CLOSE THE
ƒ  QST DE W1AW  ‰
HOLDER AND SECURE THE DIODE IN PLACE WITHOUT CRUSHING IT.  I MANAGED TO DO
THIS WITH OUT SHATTERING THE DIODE, BUT THEY GIVE YOU AN EXTRA ONE JUST IN
CASE.  THE PACIFIC ANTENNA AMPLIFIER DESIGN INCLUDES THREE BIFILAR TOROIDAL
TRANSFORMERS.  THESE TRANSFORMERS WERE NOT DIFFICULT TO WIND 14 TURNS OF
RED AND GREEN ENAMEL WIRE IN PARALLEL ON EACH FERRITE CORE.  HOWEVER, SOME
EXTRA GUIDANCE IN THE MANUAL FOR LESS EXPERIENCED BUILDERS WOULD BE
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ