[Elecraft] PSK PTT doesn't work with USB to serial converter

[Tom W8JI]

> Heck a lot of the current quality DMM's will take this in stride...  One
> of the tests we do when demoing meters (and I've seen it done commonly
> from reviewers) is to run a meter through the different feature settings
> while connected to the mains.  Often we'll just dump the probes into the
> wall at 120VAC (or often 240VAC) then slowly turn the meters knob
> through all possible settings.  Then run the knob back to off, remove
> probes from the wall and power the unit back on.  If its not still
> working perfectly and within its calibration spec we won't buy them.
> Every Agilent and Fluke meter I've tried this with passed with flying
> colors.

Good on ohms and volts, but watch out if the meter passes that test when 
measuring current. We should at least have to change a fuse, otherwise any 
meter that would survive 120 volts in that test without opening a fuse would 
have significant burden when measuring current in a low voltage circuit.

73 Tom