> I am modeling a quarter-wave loop antenna typically referred to in the
> Ham radio literature as a DDRR or Halo antenna.
The DDRR and the Halo are not the same thing in the ham
radio literature!
The Halo is a 1/2 wave dipole bent to form a circle and
is fed independent from ground.
The Halo measures 1/2 wave circumference.
The DDRR is (typically--there were variations) a very
short vertical monopole with extensive top loading
that totals a 1/4 wave, and is mounted above a ground
plane and dependent on it.
The DDRR is 1/4 wave circumference.
Here are some sources.
Nr. Subject Publ. Year/Month Page
(not exact
title)
1 20M DDRR Disguised as 1 88/11 29
Car Roof Rack
2 (follow up) 1 89/08 40
3 2M DDRR 4 79/07 126
4 2M Mobile DDRR Ant. 6 80/06 626??
5 A 40M DDRR Ant. 1 71/12 28
6 A Practical DDRR 4 70/06 20
7 A Study of the DDRR Ant. 1 72/07 27
8 DDRR Ant. 2 64/06 28
9 DDRR for Mobile Install. 4 77/05 92
10 DDRR Ant. -- Comments 1 69/11 44
11 DDRR for Mobile Use 4 88/03 32
12 Half-Wave DDRR 2 67/09 12
13 Half-Wave DDRR 2 71/09 21
14 The DDRR p.1 4 76/08 28
15 The DDRR p.2 4 76/09 34
16 Xmission-Line Ant. (DDRR) 1 75/12 19
Publications
1 = QST
2 = CQ
4 = 73 Magazine
6 = Radio Communications (Radio Society of Great Brittain
Good luck, John W0UN
John Brosnahan
La Salle Research Corp 24115 WCR 40 La Salle, CO 80645 USA
voice 970-284-6602 fax 970-284-0979 email broz_at_csn.net
Received on Fri Mar 29 1996 - 22:17:00 EST
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