[elecraft]135 ft top etc

[Geoffrey Mackenzie-Kennedy]

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