Many thanks to all who replied to my query regarding the RF problem.
the antenna has been in the same position for years and I never
experienced an RF problem when using SSB so putting a PC in the shack
changed that situation !
I do have a couple of toroids in the spares box and wrapped the LINE
IN and LINE OUT cables together around one at the rear of the PC, and
the noise from the computer soundcard was quite dramatic so perhaps I
should have done it on the individual cables.
It was interesting to know that the R7 uses a toroid core which acts
as a choke to prevent current flowing on the outside of the cable
which explains why I have never experienced this problem using SSB.
During the winter I did try the quick method to solve RF on the co-ax
by making an 8 inch coil of the cable about two feet from the
feedpoint. When I checked I found a strange thing had happened, the
resonant frequency at 14.070 had moved down to 14.010 so that was
removed immediatly !
During the weekend I moved all the cables and switches further away
from the PC and that gave me 10 metres which now tunes sweetly.
Previously the PC squealed very loudly at the very sniff of RF so the
situation is improving.
What is surprising is that I still have a problem with 12 metres, I
would have thought that solving the problem on 10 metres would have
solved it on 12 as well, but apparently not.
The next thing to try is a toroid on the individual lines in and out
and I can move the antenna further away from the shack and see if
that helps.
Kind regards, Mel G0GQK
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