[Elecraft] Possible phase noise question...

[Bayard Coolidge, N1HO via Elecraft]

One issue that someone obliquely mentioned in the various
replies that I feel requires greater emphasis, is that the
SignaLink USB box is, first and foremost, a sound "card"
and as such requires a great deal more current than a typical
USB device and should be plugged into a *powered* USB
hub. Granted, the power supplies for various powered USB
hubs are likely to be noisy (from the perspective of us hams,
anyway), and may need further treatment (chokes, bypass
capacitors, etc.). But if your SignaLink USB is plugged directly
into your laptop or desktop, know that it's drawing more current
than the USB (<3.0) spec allows, and that may be a significant
contributor to the noise problems being reported in this thread.

73 de N1HO