[Elecraft] [K3] PC Noise

[Mike Harris]

G'day,

Continuing my investigation into PC noise I tried for the first time
using the CAT interface of my microHAM CW Keyer.  Basically this
provides a USB to RS232 conversion CAT interface and a WinKey.  For 
more info on the other twiddly bits see the microHAM web site.

K3 on 6 metres, PR6 on, PRE OFF and the antenna port terminated with 
50 ohm load.

No noise.  Quieter than the CAT6 based RS232 cable I use because
with the cable I can just hear PC noise as I task switch and the CRT
monitor updates.

Previous measurements showed the directly connected KUSB to be 
approximately +10dB noisier than the RS232 cable.

No connection with microHAM other than buying a CW Keyer a couple of 
years ago.

Regards,

Mike VP8NO