=  NOW 40 WPM  =

OPERATING FREQUENCY/MODE COMBINATION AS THE INITIAL SETTING FOR EACH
BAND.  PRESSING DOWN ON THIS SWITCH AUX POSITION ACTIVATES THE
INTERNAL MEMORY KEYER RECORD AND PLAYBACK FUNCTIONS.  THE TWO
MEMORIES CAN STORE UP TO 125 CHARACTERS EACH, WITH THE MEMORY TO USE
SELECTED BY TAPPING THE DIT OR DAH PADDLE.  THE IAMBIC KEYER RANGE
IS ABOUT 5 45 WPM, ADJUSTED WITH THE KEYER NOB.  ACCORDING TO THE
MANUAL, THE TR 35 IS DESIGNED FOR CW DUTY CYCLE USE AND CAUTIONS
AGAINST TRANSMITTING CONTIN FLUSH WITH THE BOARD, SOME ARE BENT
OVER, AND OTHERS REQUIRE CLOSELY TRIMMED LEADS.  THE LOWER BOARD
CARRIES MOST OF THE RECEIVER AND TRANSMITTER RF CIRCUITRY SEE FIGURE
11.  THE IRF510 FINAL AMPLIFER IS MOUNTED WITH A SMALL HEATSINK,
MICA INSULATOR, AND PLASTIC WASHER.  MOUNTING THE FINAL AMPLIFER AND
HEATSINK REQUIRES SOME CARE.  THE IRF510 LEADS HAVE TO BE BENT
CORRECTLY BEFORE SOLDERING SO THAT THE INSULATING MATERIAL LINES UP.
THERE ARE SEVEN TOROID INDUCTORS AND A BIFILAR WOUND TRANSFORMER,
AND THESE ARE ALL SUPPLIED PREWOUND WITH TINNED LEADS.  THEY INSTALL
JUST LIKE ANY OTHER PART.  A CRYSTAL FLTER FOLLOWING THE MIXER USES
FOUR MATCHED CRYSTALS IN SERIES.  THE CRYSTALS ARE LABELED 1 4 AND
ARE INSTALLED IN THE CORRESPONDING SPOT ON THE PC BOARD.  ONE OF THE
THINGS I REALLY LIKE ABOUT THIS KIT IS THAT ALL OF THE CONNECTIONS
BETWEEN THE UPPER AND LOWER BOARDS ARE MADE USING TWO 16 PIN
CONNECTORS.  ALL OF THE SWITCHES AND CONTROLS MOUNT TO THE BOARDS,
SO THERE ARE NO INTERCONNECTING WIRES AT ALL.  THE UPPER AND LOWER
BOARDS SIMPLY PLUG TOGETHER USING THE TWO CONNECTORS AND ARE SECURED
WITH MACHINE SCREWS AND SPACERS.  ADJUSTMENTS AND FINAL ASSEMBLY AT
THIS POINT, THE RADIO IS FULLY ASSEMBLED BUT NOT PLACED IN THE CASE
UNTIL YOU PERFORM SOME CHECKS AND ADJUSTMENTS.  BEFORE APPLYING
POWER TO THE BOARDS, THE INSTRUCTIONS SHOW A FEW SIMPLE OHMMETER
CHECKS FOR POWER BUS SHORTS.  THEN CONNECT AN ANTENNA AND SPEAKER OR
HEADPHONES, APPLY POWER, AND LISTEN FOR SIGNALS ON THE FOUR BANDS
WHILE CHECKING OPERATION OF THE DISPLAY AND CONTROLS.  AT THIS
POINT, THE RECEIVER SOUNDED DEAF, SO I STOPPED THERE TO RECHECK MY
WORK.  BECAUSE OF THE WAY THE BOARD INTERCONNECTIONS ARE DONE WITH
THE TWO 16 PIN CONNECTORS, IT WAS EASY TO POP THE BOARDS APART AND
INSPECT EVERYTHING WITH A MAGNIFER, REVEALING A BAD SOLDER JOINT ON
THE FILTER SWITCH.  WITH THAT FIXED, THE RECEIVER SOUNDED FINE ON
ALL BANDS, SO I MOVED ON TO THE FINAL ADJUSTMENTS WITH THE RADIO
CONNECTED TO A WATT METER AND DUMMY LOAD.  SEVERAL TRIMMER
POTENTIOMETERS NEED TO BE ADJUSTED.  THE FIRST TRIMMER IS SET TO
JUST BARELY LIGHT THE BLUE SIG LED WITH NO SIGNAL PRESENT.  IT GLOWS
BRIGHTLY WITH STRONG RECEIVED SIGNALS.  THE NEXT STEP REQUIRES A
MULTIMETER IN SERIES WITH THE POWER SUPPLY THAT CAN MEASURE CURRENT
OF AROUND 100 MA WITH A RESOLUTION OF A FEW MILLIAMPS MOST DIGITAL
MULTIMETERS WILL WORK HERE.  IN THIS MULTISTEP PROCESS, WATCH THE
CURRENT DRAW WHILE ADJUSTING THE BIAS TRIMMER TO SET THE OPERATING
POINT FOR THE FINAL AMPLIFER FET.  THIS SHOULD
=  END OF 40 WPM TEXT  =  QST DE W1AW  <