On 9/12/2019 12:48 PM, K9MA wrote:
I disagree, Jim. If trap losses were really significant, 1.5 kW would
burn them up very quickly.
AB7E response is right on. It is a combination of the loss in the traps
and the compromised dimensions that account for the difference in gain.
About 20 years ago, a team led by K7LXC and N0AX set up and measured a
dozen or so tri-banders under VERY carefully controlled conditions. A
year or two before or after they did the same for HF verticals. You can
buy their reports on the Champion Radio website. They are well worth the
money.
N6BT's Force 12 small and large trapless tribanders (C3 and C31XR), then
relatively new designs, had the greatest forward gain. Our team for FD,
and for 7QP and CQP county expeditions uses a C3S (two of them with
sunspots).
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|