Hi Eric
Congratulations, wow!! Great work.
73's
JC
N4IS
-----Original Message-----
From: Topband <topband-bounces+n4is=comcast.net@contesting.com> On Behalf Of
Eric NO3M
Sent: Friday, February 26, 2021 6:44 PM
To: topband@contesting.com
Subject: Re: Topband: Usable size of Flag antenna and FSM
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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