[Elecraft] Elecraft Digest, Vol 71, Issue 15

[Leigh L. Klotz Jr WA5ZNU]

I have a number of different USB RS232 interfaces, plus a four-port PCI
serial card (of which only two ports work under Linux).  

Recently I tracked down a broadband noise to one of the USB ones I'd been
using to control a rotor.  It didn't make noise when the device was in use,
but if a program opened the serial port for the rotor and left it open, it
would make noise.  So it was difficult for me to track down, because only
certain programs would open the rotor port and leave it open.

Leigh/WA5ZNU

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