Topband: K9AY Loop Questions

[Jose_Carlos]

Sent from Mail for Windows

Hi Andrew

In this case it is very important to consider that both antennas are close to the ground. It means the reflection from the ground is different for vertical vectors, that see a image below the ground in the same phase and the horizontal vector that see a 180 degree image that cancel the horizontal components in opposite phase. The vertical components adds because they are in phase.

There are very few books about loaded loop receiver antennas, most because the WWII use.

https://wwrof.org/webinar-archive/high-performance-rx-antennas-for-a-small-lot/

See the slides download.

You will find a reference of the first loaded loop patent. 1938 Horizontal polarized.

Harold Beverage patents 1938 1941 ( 80 years ago) •US 2138134 A  Phasing antennas •US 2247743 A  Broad Band RX Antenna •

https://patentimages.storage.googleapis.com/73/83/00/14943032331cef/US2247743.pdf

and 1940 vertical polarized

1940. Nearly all the newly re-invented compact receive antennas derive from the terminated loop, the earliest
reference was in an appallingly mimeographed prewar training manual of W3EEE Dad‘s

1973 COMMUNICATIONS 74 CONFERENCE BRIGHTON Wednesday, June 5 1974 — Session 5 Equipment Design
Paper 5.3: Loop Antennas for HF Reception Contributed by: B.S.Collins, C & S Antennas Ltd.,

73’s
JC
N4IS