Supplied bu GB7AAA BBS Northampton
THE FOLLOWING FILE DOWNLOADED FROM NW5K (NAPOLEONVILLE,LOUISIANA)

DURING AN AMTOR QSO ON 28 MHZ BAND ON 02-12-1989 :-


PK232 MODS  FOR OP AMPS  10-03-89
THERE IS A LOT OF RUBBISH BETWEEN THE PINS 4 AND 11 OF U23, 26, 28,
30, 32 AND 34. SO I PLACED SOME 1UF CAPS ACROSS THEM AND MY
RECEIVE NOISE (MEASURED ON A MARK-SPACE SCOPE CROSS-DISPLAY) IS MUCH
MUCH LESS. IN FACT, I CAN NOW EVEN COPY SOME STEADY SIGNALS THAT
DONT EVEN RAISE THE S-METER NEEDLE. CONSEQUENTLY I BOUGHT FROM RADIO
SHACK 6- 1UF TANTALUM CAPACITORS
AND MOUNTED THEM ON THE BOTTOM OF THE BOARD, WITH THE SHORTEST POSSIBLE
LEADS IN THE POSITIONS DESCRIBED ABOVE. THE RESULTS ARE OUTSTANDING.
RTTY SIGNALS I COULD NOT COPY BEFORE ,NOW COPY PERFECTLY, EVEN WHEN
YOU CAN BARELY SEE THE TRACES ON THE SCOPE. ARQ LINKS WHICH COULD
NOT BE MADE BEFORE ,NOW FLOW SMOOTH.
THE ONLY THING I DONT KNOW IS IF THE MOD WILL WORK IF THE LATEST VERSION
OF THE PK232 FIRMWARE UPGRADE IS NOT INSTALLED, BUT I WOULD THINK
THAT IT WILL.

P. S. THE PART NUMBER FOR THE REFERENCED CAPACITORS:
      RADIO SHACK PART NO 272-1434

                          1UF 35 VOLTS (TANTALUM)
                          COST .59 CENTS EACH

THE MOST DIFFICULT PART IS IDENTIFYING THE OP-AMPS AND THE PINS
BUT HERE IS A HINT... THE PINS 4 AND 11 ARE THE MIDDLEMOST 
PINS ON BOTH THE TOP AND BOTTOM ROWS OF THE CHIP, SO ITS REALLY
HARD TO MAKE A MISTAKE.
===================================================================