Force 12's own website says their more recent coil-loaded Delta 240 is
intended to replace the older linear loaded EF-240S, their explanation
being:
"The most difficult aspect of the antenna was tuning the elements to the
proper frequencies for maximum performance. This is because the linear
loading had variances during assembly." see
http://force12inc.com/F12-Delta-240-140-Info-1.htm
Several reviews on eHam.net additionally report problems with the stiff
Alum-O-Weld loading wires/**/ breaking, so I suspect that also had some
impact on F12's decision to create the Delta 240. In theory, the Delta
240 is similar to the OptiBeam OB2-40 (the choice I made as well), but
the Delta 240 elements are a bit shorter and I'm sure the OptiBeam is
more ruggedly built.
Dave AB7E
john@kk9a.com wrote:
> I'm not sure that linear loading is as efficient as some manufactures claim
> and some models require a lot of adjusting of the linear loading wires for
> the antenna to perform properly. I personally prefer a loading coil and
> when looking for a small 2el beam for P40A, I choose the OptiBeam OB2-40.
> The coils are massive, the antenna is well constructed and easy to put
> together. My second choice (actually first choice if budget ruled out the
> OptiBeam) would be the Cushcraft XM240.
>
> John KK9A
>
>
>
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