‰  NOW 35 WPM  ‰
THE AMPLIFIER IS SWITCHED OFF LINE ALL FAILURE MODES SWITCH TO DIRECT
TRANSCEIVER OPERATION SO YOURE STILL ON THE AIR, THE READY LIGHT IS
EXTINGUISHED AND THE FAULT LED IS ILLUMINATED.  THE AMPLIFIER PLATE CURRENT
IS MONITORED AND IF A SAFE VALUE IS EXCEEDED, THE POWER UP TIMER IS 
ACTIVATED LEAVING THE AMPLIFIER OFF LINE FOR ABOUT TWO MINUTES.  THE
AMPLIFIER SCREEN CURRENT IS LIMITED TO AVOID TUBE DAMAGE.  EVEN IF PLATE
VOLTAGE IS LOST, A CONDITION THAT USUALLY RESULTS IN VERY HIGH SCREEN
CURRENT, THE LIMITING IS SAID TO PROTECT THE TUBE FROM MELTDOWN FOR AN
EXTENDED PERIOD.  THE AMPLIFIER WILL SWITCH TO BYPASS IF THE SWR EXCEEDS
2.6 1.  THE AMPLIFIER IS SET TO FLIP TO BYPASS IF DRIVEN BEYOND THE POINT
AT WHICH DISTORTION WOULD OCCUR.  IT STAYS THAT WAY FOR 2 SECONDS AND THEN
WILL CHECK AGAIN, CONTINUING TO DROP OUT UNTIL THE CONDITION IS REMEDIED.
ANOTHER AUTOMATED FUNCTION IS PROVIDED, NOT EXACTLY A SAFETY FEATURE, BUT A
GOOD IDEA IN MY VIEW.  CIRCUITRY IS PROVIDED TO DETECT RF AT THE AMPLIFIER
INPUT.  IF THERE IS LESS THAN 0R5 W OF RF AT THE AMPLIFIER INPUT, IT
CHANGES THE TUBE BIAS TO CUT OFF PLATE CURRENT.  THIS SHOULD REDUCE AVERAGE
‰  FROM PAGE 91  ‰
2 3 1,100 NTX KA2BEO 222 2 12 1,076 SNJ Thomasvile ARC W4UCJ KG4SEA 136 2
32 1,072 GA Utica ARC K2IQ 329 2 5 1,072 WNY Amherstburg VA3ARG 233 2 12
1,066 ON 9 0 4 ARC K9IM 182 2 7 1,064 IL Laguna Beach KE6GFI 186 2 36 1,042
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ