Symmetry? The whole show with rhombics is beamwidth and elevation
angle, not really gain, which has been pointed out in much of the
literature. A "perfect" rhombic will have an extremely narrow beamwidth
in the 10 to 15 deg range at HF [and if large enough, at MF as well].
Asymmetry will distort that characteristic, and raise the amplitude of
side lobes. Effective rhombics for ham usage will require an "array' of
them with different headings. Lots of land, lots of property taxes.
Stacked, rotatable yagi's might be a better choice if your bank account
is sufficient. Trees growing inside a rhombic will slowly degrade its
performance, yet another cost. Of course, you might be able to sell the
lumber. [:-)
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 9/13/2019 5:01 PM, David Haines wrote:
Well, I'm not wealthy. But we do have 270 acres of forest-land
covered with nothing but trees. So a rhombic or two sounds really
good, which never occurred to me before. Thanks, Don!
Across the field from my shack, maybe 600', is a row of 90' pine
trees. More trees on either edge of the field for the vertices. And
the feed could be right at the shack. How important is symmetry?
I've been deciding how much Wireman #534 to buy, so it sounds like I
should go for at least 1000'! Still will need a lot of support line,
though.
david, in the forests of Maine
KC1DNY
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
