I've definitely verified that it's the polling from the two laptops. Increasing
the polling interval correspondingly decreases the cycling frequency. It's
quite tolerable with the polling set at 50, but it would be nicer not to have
the problem at all. I'm still open to any advice from anyone who's dealt with
this in the past.
--Jeff, K6JW
----- Original Message -----
From: J. Wolf
To: [email protected]
Sent: Tuesday, July 06, 2010 1:13 PM
Subject: Computer RFI in K2
Recently, I made up the cable to connect my K2/100 to both the KAT100 ATU
and my laptop. Everything works just fine...except for RFI from the computer to
the radio when any of several logging programs is loaded (N1MM and CommCat
being my two main programs). It sounds like a rapidly cycling change in the
radio's noise level, and the S-meter reflects this, going from a baseline band
noise level up to S9 with a period of just under a second. I've tried ferrite
beads on everything, better grounding of the radio, and just connecting to the
computer without the ATU, but nothing seems to have worked. The RFI isn't
getting in via the coax feedline, since disconnecting it has no effect. In
desperation, I tried a different laptop but got the same problem. The
connection is via a serial to USB converter, and I've tried two different ones
with no resolution of the problem. There's NO problem when the computer is
running without either of the logging programs booted, so I'm guessing
this might have something to do with polling. Does anyone have any experience
with this and, if so, any suggestions?
Jeff, K6JW
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
