Right. The gain shortfall is the result of a design that causes the
elements to be shorter, which reduces their radiation resistance, and
the inductive loading provided by the traps. It also modifies the
current distribution in the elements. This is directly analogous to what
happens in a mobile antenna with a base- or center-loading coil.
There was an excellent two-part piece of research on this published in
QEX 4-5 years ago, and included careful measurements of field strength
resulting from various positions of the loading coil and the the use of
top (capacitive) loading.
73, Jim K9YC
On 11/22/2019 2:22 PM, Joe Subich, W4TV wrote:
The K7LXC and N0AX test protocols have been independently
verified and only the Mosley tribanders showed significant
gain shortfalls.
Believe what you like but the Mosely shortfall is most
obvious on 15 meters where the element shortening is the
most pronounced. If you want to discount the K7LXC/N0AX
results, you need to provide a verifiable hypothesis to
explain the "Mosley anomaly."
73,
... Joe, W4TV
On 2019-11-22 3:39 PM, Glenn Pritchard wrote:
That false narrative about high loss is just not true.
I’ve been working with traps for over 30 years and have never seen the
losses that those two claimed.
Glenn, VA7UO
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