Topband: Usable size of Flag antenna and FSM

[n4is at comcast.net]

Hi Eric

Congratulations, wow!! Great work.

73's
JC
N4IS

-----Original Message-----
From: Topband <topband-bounces+n4is=comcast.net at contesting.com> On Behalf Of Eric NO3M
Sent: Friday, February 26, 2021 6:44 PM
To: topband at 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 at 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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