‰  NOW 35 WPM  ‰
THE RF POWER TRANSISTORS COOL DURING TYPICAL USE.  WITH 5 W INPUT, THE
OUTPUT CAN BE AS HIGH AS 100 W.  THE AMPLIFIER IS NOT INTENDED FOR 100 DUTY
CYCLE OPERATION, BUT WOULD TOLERATE THE EXTRA HEAT WITH AN ADDED FAN.  RF
COMING INTO THE SUPERPACKER GOES DIRECTLY TO THE CONTROL BOARD.  THE
CONTROL BOARD HAS A VERY SENSITIVE VOX CIRCUIT.  THE VOX CIRCUIT ACTIVATES
TR SWITCHING RELAYS ON THE RELAY BOARD AT THE START OF TRANSMISSION.  YOU
CAN, HOWEVER, USE THE PUSH TO TALK PTT INPUT INSTEAD.  JUST GROUND THE PTT
INPUT TO TRANSMIT.  THE PTT LINE DRAWS ABOUT 20 MA OF CURRENT.  PTT CONTROL
OF THE AMPLIFIER SPEEDS UP TR SWITCHING AND IS IDEALLY SUITED FOR CONTEST
OPERATION.  A JUMPER JP1 ON THE CONTROL BOARD CAN BE USED WITH PTT
OPERATION TO ELIMINATE THE VOX DELAY.  IN ADDITION TO DRIVING THE VOX
CIRCUITRY, THE INPUT RF PASSES THROUGH AN ATTENUATOR FORMED BY R5 THROUGH
R7 ON THE CONTROL BOARD.  ALMOST ANY QRP RIG CAN BE CONNECTED TO THE INPUT
S LONG AS ATTENUATOR R5 TO R7 IS SET TO PROVIDE A MAXIMUM OF 2R5 W OUTPUT
FROM THE ATTENUATOR.  THE VALUES SHOWN ON THE SCHEMATIC PROVIDE 3 DB OF
ATTENUATION, WHICH IS SUITABLE FOR A 5 W TRANSCEIVER LIKE THE YAESU FT 817.
‰  FROM PAGE 97  ‰
W0CUO 164 2 11 1,122 NE Lee DeForest ARC W6OB 209 2 10 1,084 ORG Tri Co ARC
VE9EWR 154 2 14 1,082 MAR Disney Emergency ARS WD4WDW 162 2 4 1,074 NFL
Morgan Co R L School Club KC0LZD N0AYI 69 2 35 1,056 MO C 5 KI7EL 200 2 3
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ