my previous PC picked up a little interference when I was using CW on 10m with my G5RV 1/2 size.
just a slight ripple on the monitor.
well, new PC and new monitor and the whole thing freezes when I use 10m. then takes 5 seconds or so to come back to life afterwards.
so I asked those wise people over at Hamradiodeals what to do about it.
Naturally, as this was Hams there were a whole range of ideas!!
as always the old chestnut of "ditch the coax and go twin feeder came up, and while I accept that it may well work, I have three antennae, all connected by coax, and I have no experience of twin feeder other than as a part of a G5RV, so I'll respectfully pass on that.
other ideas were ferrite sleeves at the antenna end, a 1:1 balun and an ugly balun.
my ebay empire has been passable recently so I jumped on and ordered the bits to do all the above.
except the twin feeder thing!
first to arrive was the FT240-43 ferrite toroid (£7.99 inc post). Google provided me with this diagram from VK6YSF
OK, seems straight forward enough......
a rummage in my scraps box produces the wire, a plug and a socket......
as many turns as would fit on the ring.....
a few solder joints....
and a quick test before I bother to find a case.....
now, as some point I WILL case it up nicely.... but right now, the RF in the shack is gone, and on a pretty much dead 10m band I had a 10m QSO with UY5BO in Ukraine within seconds, and a couple of 20m contacts to make sure all was well there too.
so, problem solved for a total cost of £7.99, a few scraps and about 1/2 an hour's tinkering.