Subj : PSK31
To   : ROY WITT
From : JIM MUNDEN
Date : Tue Aug 08 2000 06:27 pm

Hello!  I think the base unit may have a parallel port.  The laptop
interfaces with it using a miniature SCSI port.  I don't use a printer
with it, so the port is available.
With regards to the Swan, I'm pretty sure the hum originates in the
power supply.  According to the schematic, the only AC output to the rig
is for the tube heater circuit.  I installed a rectifier to change it to
DC, and changed all the capacitors.  I also found the choke burned out,
but haven't replaced it yet.  When I do, I hope the hum will go away.
Otherwise I may try putting a filter in the audio circuit to eliminate
the hum.




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