Re: ARLA/CLUSTER: O que necessita saber para contactar Arecibo no próximo fim-de-semana.

[António Matias]

Boas.
Da ultima vez que activaram, KP4AO, chegavam na minha estação com sinal real
de s5.
Estava com uma antena de  9 WL ( 9 comprimentos de onda)  apontada à lua.
Mesmo com a antena  de forma precária apontada à lua, com o reflector no
chão e apoiada num escadote, o sinal era magnifico.
Daí que lanço o desafio, aos colegas que tenham uma direccional de UHF na
garagem ou na caixa, que a montem e experimentem escutar Porto Rico em UHF
via Lua.

É uma experiência inesquecível.

73

Matias
CT1FFU-CR5A

www.dxpatrol.com


No dia 13 de Abril de 2010 13:59, João Gonçalves Costa
<joao.a.costa  ctt.pt>escreveu:

>   Arecibo Coverage Maps
>
> *Russ, K2TXB* has made available coverage maps for the Arecibo 432.045 MHz
> EME transmissions from Puerto Rico on April 16-18.
>
> He writes:
>
> It seems to me that there are a lot of guys asking questions about the
> Arecibo operation, wanting to know if and when they can work them. So I have
> put up three pages on my web site that show the ground coverage that the
> Arecibo dish will have on each of the days of operation.  Go to:
> http://www.k2txb.com/
>
> The first three links will show you the times and coverage for each of the
> three days. Generally the moon will be high in the sky when you can work
> them, so you should expect to build up some sort of temporary support
> structure that will allow you to aim your antenna up and manually position
> it to point at the moon. Ideally the support structure should be as low to
> the ground as possible and still allow the back of the antenna to clear the
> earth when pointed up.
>
> If you can see the Moon, all it will take is a visual aiming. Lay on your
> back under the antenna and sight along the boom to verify that the boom is
> pointed straight at the Moon. For short antennas this is not very critical
> and generally within 10-20 degrees will work.
>
> If you cannot see the Moon (due to cloud cover) then you need a program to
> tell you where the Moon is, from your location at the current time. Then you
> will need a way to measure and set the elevation and the azimuth of the
> antenna. Elevation can be measured easily with a level and a protractor, or
> a simple gravity operated inclinometer such as sold for a few dollars in
> most any hardware store.
>
> Azimuth can be measured with a compass, but make sure you take into account
> the offset in your area between true north and magnetic north. An easy way
> to determine how much offset you need for your compass headings is to see
> how much difference there is between your compass heading and the location
> of the Sun. Any Moon program will also show Sun locations so this is easy.
>
> The web pages that I put up are Q&D (Quick and Dirty). Maybe I will enhance
> them with a little more information in the coming days.
>
>  Very 73, *
> Russ K2TXB*
>
> FN20MB (MB for Moon Bounce)
>
> http://www.k2txb.com/
>
> Moon-Net Email reflector
> http://list-serv.davidv.net/mailman/listinfo/moon-net_list-serv.davidv.net
>
> Arecibo on 432 MHz Moon Bounce April 16-18
> http://www.southgatearc.org/news/april2010/arecibo_432_moonbounce.htm
>
> _______________________________________________
> CLUSTER mailing list
> CLUSTER  radio-amador.net
> http://radio-amador.net/cgi-bin/mailman/listinfo/cluster
>
>
-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20100413/0b58676d/attachment.html