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Author Topic: Antenna's  (Read 235 times)
NX1G
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Posts: 6




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« on: June 18, 2003, 07:21:00 PM »

If you wanted to work 6-80 meter SSB and could put up no towers and had only medium height trees at 45-50'. What would you fellow hams recomend for the best bang for an antenna. Thanks, Steve, NX1G
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W6HB
Member

Posts: 38




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« Reply #1 on: June 18, 2003, 09:32:03 PM »

Look at L. B. Cebik's website by typing W4RNL into your browser search window to investigate your question in extreme detail. A couple very economical choices come to mind. For relatively onmidirectional performance, an 80 meter full wave horizontal loop with tuned feeders will give you surprisingly good results. Your trees are a big plus here that many of us do not have and despite those who believe this antenna is primarily a cloud warmer, most who have actually used it will tell you otherwise. If your want predictable broadside bi-directional patterns, an 88' doublet works well on 80 through 30 and a 44' doublet works well on 40 through 10. Running the 44' doublet in the vertical plane will give great low angle, onmidirectional results for DX. Most anything will function on 6 meters when the band is open. A small Yagi-Uda or quad could be homebrewed easily for your needs 50 mhz and up.
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RobertKoernerExAE7G
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Posts: 1435




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« Reply #2 on: June 19, 2003, 03:32:10 AM »

Why are you limited to one antenna?

Bob
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WB6BYU
Member

Posts: 13343




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« Reply #3 on: June 19, 2003, 04:15:47 PM »

I agree with AE7G - the most bang for your buck is a
number of different wire antennas for whatever bands/
modes are of interest to you.

A large horizontal loop or dipole fed with open wire
line will work all bands reasonably well, though the
pattern on 6m may have nulls in some desired directions.  On 80 it will be great for local contacts
(out to several hundred miles / 1000km) but for better
DX coverage on 80/40 or 160 a vertical loop or half-
square will usually be much better.  

If you have specific directions you want to work on the
higher bands you could try a bisquare, vee beam, quad,
Sterba curtain, rhombic, hentenna, or lazy-H, or many
other types.  Some of these will work on multiple bands,
some will be bidirectional, etc.

Even without a tower you can put up a rotatable quad
antenna supported by the trees - one of the early
volumes of the ARRL Antenna Compendium had plans for a
"Gossamer Quad" for 20m that was suspended from a rope
running between two trees.  And I've even seen yagis
mounted on the tops of pine trees, or on a mast lashed
to the trunk and sticking above the crown of a tree if
it isn't as straight as a pine.

If you just want to get started on the air, then a
center-fed dipole using twinlead or open wire line to a
tuner is probably the simplest.  Any length will work
somewhat, but a minimum 80 or 90' will improve the
performance on 80m.  Then, as you find what bands you
like to operate, and where you want better performance,
you can design additional wire antennas to suit those
specific needs.  This doesn't mean the back yard has
to be rigged like a frigate, and clearly the options
will depend on the placement of the trees.  But wire
antennas are cheap, and experimenting with them is IMHO
one of the most rewarding parts of ham radio.
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N6AJR
Member

Posts: 9910




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« Reply #4 on: June 21, 2003, 06:02:27 PM »

I would use a multiband , home made  dipole , or also called  a "fan dipole"  do a search for fan diopole on elmers here and see what you can do wit  a $10 piece of coax and $5 worth of insulated wire.  73  tom N6AJR
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