Hi Eric Congratulations, wow!! Great work.
73's JC N4IS -----Original Message----- From: Topband <[email protected]> On Behalf Of Eric NO3M Sent: Friday, February 26, 2021 6:44 PM To: [email protected] 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, [email protected] 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. _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
