[TowerTalk] Slopers, half slopers, (using the tower)

[kk9a at arrl.net]

Since the tower is part of the 1/2 sloper antenna system, the radiation is
more omni directional than a full sloper.  It's radiation pattern is similar
to an inverted "L".  I'm not sure if you can gain much by having 1/2 slopers
in different directions.

John


----- Original Message -----
From: "Tower (K8RI)" <tower at rogerhalstead.com>
To: <towertalk at contesting.com>
Sent: Sunday, September 26, 2004 00:57
Subject: [TowerTalk] Slopers, half slopers, (using the tower)


Any one have experience with "half slopers"? (half of a half wave with
the tower serving as the other side)

Yesterday I installed a half sloper for 160 and am quite pleased with
the results.  The feed point is roughly 96 feet and the angle is close
to 45 degrees on the South side of the tower.

According to the "Antenna Handbook" there is some gain away from the
tower through the antenna.    I'm thinking of installing two more. One
to the NE and one to the NW.

Currently I have a half wave center fed sloper on 75 to the NE which
works quite well into Europe.

I have about zip for background on the half sloper and wonder how they
compare to the center fed half wave sloper.

If the performance of the half sloper on 160 is any indication I'd
expect it to compare favorably with the center fed half wave version.

What I'd really like to do is get half slopers up on 75 as well if they
perform well, but then I have concerns about interaction and what would
be the best height on the tower to anchor the ones for 75.  The added
bonus would be getting rid of those big loops of coax to the feed points
and the weight that causes the half wave center fed slopers to sag.

Any thoughts or suggestions?

Roger (K8RI)

_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.

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