Each satellite transmission will have a footprint
- this is an area of optimal signal reception
try http://www.satbeams.com/footprints has a
nice graphic display of the information.
At 04:28 PM 11/27/2008 +0100, you wrote:
Dear John,
The manufacturer told me, that the sundial has
been calculated for the ASTRA-TV-satellite
system, which carries a lot of middle European
TV-stations, on 19.2° East in an geoorbital
position and the city of Frankfurt on the Main river.
Best regards
<?xml:namespace prefix = st1 ns =
"urn:schemas-microsoft-com:office:smarttags" />Josef Pastor
_______________________________________
-----Ursprüngliche Nachricht-----
Von: JOHN DAVIS [mailto:[EMAIL PROTECTED]
Gesendet: Donnerstag, 27. November 2008 14:34
An: 'Sonnenuhr (Uni Köln)'; Josef Pastor
Betreff: Re: Satellite Antenna Sundial
Dear Josef and dialling colleagues,
Thank you for this most interesting information.
I actually made a satellite dish sundial in
1999. The story was published in the British
Sundial Society Bulletin, 11(ii), pp.77-80 (June
1999). I even used the same motto - Carpe Diem
- as is on one of the two commercial
versions. I should have patented the idea!
I believe the commercial dials probably have
adjustable gnomons. Whilst the hourlines should
also change with the location of the dial and
which satellite it is aligned to, it probably is
not too inaccurate to have a fixed set of lines
for a small geographic area. One of the
advantages of the geostationary orbits of
broadcast satellites is that they are mainly in
quite a small portion of the sky.
I would be most interested in any further
information you can obtain from the manufacturers.
Regards,
John Davis
-----------------------------
Dr J Davis
Flowton Dials
--- On Thu, 27/11/08, Josef Pastor <[EMAIL PROTECTED]> wrote:
From: Josef Pastor <[EMAIL PROTECTED]>
Subject: Satellite Antenna Sundial
To: "'Sonnenuhr (Uni Köln)'" <[email protected]>
Date: Thursday, 27 November, 2008, 11:51 AM
Dear Dialists,
the "German Satellite TV Sets - producer" FUBA
from Muenster/Westphalia offers actually a
special edition of "parabolic sundial satellite
antennas". Two versions are available. These
have an diameter of 85 cm. For the technical details look at:
<http://shop.fuba.de/index.php?cat=c1816859_85-cm-Klasse.html>http://shop.fuba.de/index.php?cat=c1816859_85-cm-Klasse.html
Best regards
Josef Pastor
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