Anti-phased double loops are also a good way to approach an RDF of 10dB
on 2200m (137kHz). 1/2lambda is nearly 3600ft.... so broadside arrays
and beverages are usually a non-starter... close spaced end-fire
vertical arrays get very touchy (amplitude/phase). A DHDL style system
spanning about 350ft works well here (quiet rural QTH):
http://no3m.net/2020/09/2200m-double-loop-receive-antenna/
The one I use is aimed west and hears VK4YB (and recently VK2AN) on
2200m most mornings starting a couple of hours prior to sunrise (and at
times has gone an hour or more past sunrise).
- Eric NO3M
On 2/26/21 12:57 PM, n4is@comcast.net wrote:
I would like to share some of my experience with small flags'.
The directivity is the same for a large chance in frequency but the gain
increase with size.
So a small loop is not thermal noise limited on 160m, and works very well on
80, 60 40 and 30m.
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