‰  NOW 40 WPM  ‰  TEXT IS FROM DECEMBER 2004 QST  PAGES 63, 64 AND 91  ‰

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
‰  QST DE W1AW  ƒ
DISSIPATION AND HEAT LOAD.  IT OPERATES QUICKLY ENOUGH TO SWITCH BETWEEN
SYLLABLES.  DOCUMENTATION THE AMPLIFIER COMES WITH A THOROUGH 40 PAGE
MANUAL.  FOLLOWING A DESCRIPTION AND SPECIFICATIONS, IT GUIDES YOU THROUGH
UNPACKING, INSTALLATION AND INTERCONNECTIONS.  NEXT, IT PROVIDES A
STRAIGHTFORWARD STEP BY STEP TURN UP AND TUNE UP SECTION, SPECIFYING
EXACTLY WHAT INDICATIONS ARE ANTICIPATED AND WHAT TO DO TO MAKE SURE THEY
HAPPEN.  NEXT ARE 12 PAGES DEVOTED TO FULL SIZE SCHEMATICS, BOARD LAYOUT
AND TIMING DIAGRAMS.  THE LAST SECTION CONSISTS OF 6 PAGES DEVOTED TO
TWEAKING THE INTERNAL ADJUSTMENTS, SHOULD THEY EVER NEED TO BE CHANGED.  A
NICE FEATURE IS A SET OF PHOTOS INDICATING THE LOCATION OF THE INTERNAL
CONTROLS.  INSIDE THE MANUAL FRONT COVER IS A TABLE OF INITIAL SETTINGS FOR
EACH BAND, HAND ENTERED FOR THIS UNIT, WITH THE SERIAL NUMBER AT THE TOP OF
THE SHEET.  ATTACHED TO THE BACK COVER IS A TEST DATA SHEET, AGAIN FOR THIS
UNIT, BY SERIAL NUMBER, WITH ALL THE CRITICAL VOLTAGE, CURRENT AND POWER
‰  FROM PAGE 91  ‰
ORG WorldRadio Staff ARC WR6WR 410 2 3 1,020 SV ARES D24 Franktown Fire
Group N0LP 403 2 12 1,006 CO KC7EMZ 176 2 3 902 OR Socorro Amateur W5AQA

DIFFERENT FEATURES, SUCH AS DIFFERENT CONNECTOR GENDERS OR TYPES SELECT
CAREFULLY SO YOU WONT NEED ADAPTERS OR EXTRA CABLES FOR YOUR INSTALLATION.
SOME OFFER TRIPLEXERS AS WELL AS DIPLEXERS WITH DIFFERENT BREAK
FREQUENCIES.  IN ADDITION, DCI OFFERS SI
‰  FROM PAGE 91  ‰
of W0YC 165 2 8 788 MN Pamlico ARC K4BCH 213 2 7 786 NC Shy Wy QCWA K7TFW
‰  END OF 40 WPM TEXT  ‚