This is a different beast than a sloper. The antenna is comprised of 3
elements. The "driven" elements (the ones connected to the coax) start at 15
feet high on the tower. They are set so that they are together at the tower and
8' apart at the ends (52') away at about 12' high. The third element is
grounded to the tower at the top and ends approximately between the other
elements at about 11' high (not grounded at this end).
The author of the article claims an almost omnidirectional pattern at about 30
to 60 degrees. The mininec charts are in the book.
Clint - W5CPT
----- Original Message -----
From: Richards
To: W5CPT
Cc: Marinus Loewensteijn ; TowerTalk
Sent: Wednesday, August 20, 2008 11:50 PM
Subject: Re: [TowerTalk] Broadband Sloper
My understanding is that those slopers (kinda like the AlphaDelta
DX-A and DX-B sloper antennas) need to be hung off a high tower,
where the tower and, maybe, a yagi beam comprises a capacity hat,
and work even better with a few radials and a good ground. Otherwise,
it is just an odd sort of inverted V dipole and if it is trapped, you
are better
off with a broadband doublet fed with window or ladder line.
Just MY take. (My AlphaDelta DX-B sloper sucks without a tower, yagi
capacity hat, and good ground system.) A service tech at TenTec
company agrees as he had one and says they suck if not properly
installed as described above. ARRL Antenna Handbook has a nice
short write up on them that covers the essentials well.
================ K8JHR ==============
W5CPT wrote:
> In the ARRL Antenna Book, 17th edition, the antenna you are interested
is explained on pages 4-16 to 4-18. It is called the K0EOU Broadband
Sloper.
=====================================================
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|