PK232SAT.1
  
If you have an HF RTTY modem you can use this with the PK-232 to improve
copy of AO-13, (as well as greatly improve terrestrial HF operation of
the PK-232) as the lack of individual tone filters and 200 Hz shift of
the PK-232 results in less than optimum decoding.  I found that with my HF
modem's 170 Hz shift (which is AO-13's RTTY tone shift) and separate tone
filters I can copy AO-13 RTTY telemetry from horizon to horizon error free,
while the PK-232's internal modem will return occasional errors until the
signal reaches a high enough strength to overcome the PK-232's modem's
bandpass (not separate tone) filtering and 200 Hz shift limitations.
Also on HF RTTY I can copy weak signals with a greatly reduced error rate.
CONTINUED IN FILE PK232SAT.5