Hi Bryan,
Your approach as you say solves a lot of problems. I use someting similar
here using antennas each matched to 50 ohms, but a remote ATU would be a
better approach and would certainly add to a multiband capability. From a
remote coax multi-position antenna select switch, the main RG-213 feed about
80ft in length runs underground to the shack in a plastic pipe (with drain
holes) along with the control cable for the coax switch. When putting a
dummy load at the remote switch all that I can hear is receiver noise,
although I suppose that the noise generated by the coax itself and the dummy
load is in there as well. I had been worried that the rabbits, moles and
their friends might be interested, but seemingly they are not.
73,
Geoff
GM4ESD
On Tuesday, October 03, 2006 9:39 AM you wrote:
Hi All,
My solution, though not cheap, is to feed at the centre of the doublet with
450 ladder line, and tune at 5ft above ground to a SG230 auto tuner, and
then any length of 50 ohm coax, preferably double screened. I have no
troubles with any rfi etc from noise sources, pc's, switch mode psu's, and
don't cause any tvi/rfi myself.
Not the cheapest solution as I say, but solves a lot of problems. ATU's
should be close to the antenna, not in the shack or tranceiver.
73 Bryan GM3AKF
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