My present 10' shielded loop is used only for the BCB and below so much of
this would likely not affect my system as much as if it were to be used on
higher frequencies,
But, this would be a bit difficult to construct, possibly using 1/2"
tubing for the outer element, 5/15" tubing for the inner element, and some
plastic tubing for the insulator. Not sure of the benefit of doing this
would be worth the effort.
yes...I agree. I believe Everett constructed a similar high efficiency
shielded element but not sure if he was able to compare it with RG8 or RG11
at low frequencies to measure the changes. In a system limited by
atmospheric noise levels I'm not sure there is much to be gained by
rebuilding my present RG58 shield element. At 10' diameter, anything heavier
would eventually suffer storm failure here on the ocean.
There may be an indirect advantage. With the bulk resistance reduced, the Q of a series-tuned loop would increase, which would result in a narrower tuned bandwidth and consequently lower received noise power.
Chris Trask
N7ZWY / WDX3HLB
Senior Member IEEE
