[WT-support] RFI and Wintest

[Stewart GM4AFF]

Just to close the loop on this issue, I think I have resolved the problem. I
use a large patch panel to terminate all my feeders and then use patch leads
to the antenna switch box, or radios as required. The 15m and 40m plugs on
the back of the panel, where the outdoor antenna feeders are terminated, had
pretty much begun to separate, probably with weight and age. It was not easy
to see, but the outer on 15m had almost separated from the coax plug, and
the one on 40m wasn't much better. I'm using crappy coax on 15m too, which
is not filling up the hole on the back of the PL259 plug. So, after a
remake, the problem appears to be resolved. So much so that my cross-talk
between 40m and other higher bands is negligible. I'd forgotten how good it
had been!

Bob - just to clarify - the 40m antenna is resonant on a compromise
frequency around 7.1, so it not a good match for lower end CW. Fixing the
plug reduced the SWR a good bit. Both antennas are fed with underground
feeders and have baluns on the feed point.

Thanks to Bob and Frank for your help on this.

73

Stewart

GM4AFF

 

From: support-bounces at f5mzn.org [mailto:support-bounces at f5mzn.org] On Behalf
Of Bob Wilson, N6TV
Sent: 25 March 2014 20:59
To: Win-Test Reflector
Subject: Re: [WT-support] RFI and Wintest

 

Try a different keyboard, maybe a wireless keyboard and mouse, or put
ferrite beads on all cables leading to the PC, as many turns as you can.
Mix #31 works well.

 

Of course make sure it's really RFI and not a configuration error.  Perhaps
the PTT and CW pins are reversed.  This will cause a key down carrier for
the duration of the message.




73,

Bob, N6TV

 

On Tue, Mar 25, 2014 at 1:53 PM, Stewart GM4AFF <stewart at gm4aff.net> wrote:

I am having some problems with RF getting into my PC and upsetting the
WIntest keying. I can do what I like with the paddles when I run power, but
as soon as I touch a WIntest function key to send CW it just locks
everything up with a solid transmitted carrier. I was able to eliminate this
on my last PC by grounding the case and using WiFi, but not on this PC. It's
only bad on 15 and 40m. The 15m antenna is quite near the shack and the 40m
antenna has a bad SWR at the moment - so I know the cause.

Does anyone have advice on what can be done to prevent this - practical
down-to-earth solutions (excuse the pun).

Thanks!

Stewart

GM4AFF

 


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