That is a pretty poor SWR curve for a 4 element Yagi. Does it have two
driven elements? I have a couple of OptiBeam OB4-40's with dual driven
elements that I have not had time to put up. The modeled SWR is less than
1.5:1 across the whole band and with coax loss it might be less in the
shack. If I recall correctly, the linear loaded version of this antenna was
also resonant on 15m so you may need a lot of separation from your
tribanders.
John KK9A
K4XS wrote:
M2 has a new version of their 40 meter Yagi - 40M4CDD. unlike the one it
replaced, it covers 7.0 - 7.2 mHz, or 7.1- 7.3 mHz. Of course the
"adjustable" elements can be shortened to make the sweet spot up a little
higher than 7.0 - 7.2.
The brochure says SWR varies from 1.2- 2.0. However, when I asked M2 if
they could send me a print out of the graph they responded they couldn't,
which made me scratch my head. $3000 for an antenna and they can't do that?
Anyone out there who has this specific antenna, not the one it replaced, let
me know your experience with it...SWR, construction etc.
73 Bill K4XS/KH7XS/V31XX
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