| Author |
Message |
Graham Vincent
Guest
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 Posted:
Wed Aug 24, 2005 7:31 am Post subject:
Orbitron dish declination scale |
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Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate the
correct declination scale? I'm at 39 Deg South.
Thanks,
Graham |
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Craig Sutton
Guest
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| Posted:
Wed Aug 24, 2005 8:08 am Post subject:
Re: Orbitron dish declination scale |
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"Graham Vincent" <graham@spamtrap.co.nz> wrote in message
news:pan.2005.08.24.02.31.18.902547@spamtrap.co.nz...
| Quote: | Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate the
correct declination scale? I'm at 39 Deg South.
You may be able to find someone with the same make model dish at |
www.vetrun.com
They may be able to take a photo that will help. |
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bassett
Guest
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| Posted:
Wed Aug 24, 2005 8:08 am Post subject:
Re: Orbitron dish declination scale |
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As you have only given your latitude of 39 degrees South, and no Longitude,
it's a bit hard to work out your declenation off-set angle, But i would
think it's about
5.5 degrees.. according to my declenation table.
bassett
"Graham Vincent" <graham@spamtrap.co.nz> wrote in message
| Quote: | news:pan.2005.08.24.02.31.18.902547@spamtrap.co.nz...
Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and
the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate
the
correct declination scale? I'm at 39 Deg South.
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Bhai
Guest
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| Posted:
Tue Sep 06, 2005 2:43 pm Post subject:
Re: Orbitron dish declination scale |
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Graham Vincent wrote:
| Quote: | Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate the
correct declination scale? I'm at 39 Deg South.
Thanks,
Graham
Graham Good Day, I have exactly the same problem, have you resolved your |
problem yet? |
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Graham Vincent
Guest
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| Posted:
Wed Sep 07, 2005 12:08 am Post subject:
Re: Orbitron dish declination scale |
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On Tue, 06 Sep 2005 09:43:08 +0000, Bhai wrote:
| Quote: | Graham Vincent wrote:
Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate the
correct declination scale? I'm at 39 Deg South.
Thanks,
Graham
Graham Good Day, I have exactly the same problem, have you resolved your
problem yet?
|
A solution of sorts:
Declination data from www.telsat.com/declin.htm tells me I need about 6
degrees down angle.
A google search seems to indicate that the dish has a maximum declination
angle of 8 degrees.
Study the dish mount from the west so you can see the declination angle
that has been set on the main part of the mount (90 - 39 = 51 for me).
Rotate the dish until you have the dish mounting ring at 90 degrees to the
main mounting i.e. no extra declination. This is the zero declination
position so put a mark on the dish and mounting to this effect. Rotate the
dish 90 degrees so it is pointing down the maximum 8 degrees. Put a second
mark on the main mounting for this position. I want 6 degrees down so
rotate the dish back a quarter of the distance between the two marks.
Now perch on top of a step ladder and rotate the feed to get the
horizontal and vertical LNBs back to the right angle. Try not to fall off!
It's probably safer to disconnect the actuator arm and drop the dish down
to get at the feed from ground level. Make your own choice on this one.
I've got good feeds from PAS8 and can get signals in from PAS2 and I701
but the strength is too low to decode anything on the last two at present.
More work required...
Good luck.
Graham |
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Bhai
Guest
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| Posted:
Thu Sep 08, 2005 3:13 pm Post subject:
Re: Orbitron dish declination scale |
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Graham Vincent wrote:
| Quote: | On Tue, 06 Sep 2005 09:43:08 +0000, Bhai wrote:
Graham Vincent wrote:
Hello.
My 12 foot dish mounting has had a major corrosion problem. After
sandblasting and priming in a local workshop the declination scale and the
index mark on the dish have gone :-(
Can anyone tell me where the index mark should be and how to calculate the
correct declination scale? I'm at 39 Deg South.
Thanks,
Graham
Graham Good Day, I have exactly the same problem, have you resolved your
problem yet?
A solution of sorts:
Declination data from www.telsat.com/declin.htm tells me I need about 6
degrees down angle.
A google search seems to indicate that the dish has a maximum declination
angle of 8 degrees.
Study the dish mount from the west so you can see the declination angle
that has been set on the main part of the mount (90 - 39 = 51 for me).
Rotate the dish until you have the dish mounting ring at 90 degrees to the
main mounting i.e. no extra declination. This is the zero declination
position so put a mark on the dish and mounting to this effect. Rotate the
dish 90 degrees so it is pointing down the maximum 8 degrees. Put a second
mark on the main mounting for this position. I want 6 degrees down so
rotate the dish back a quarter of the distance between the two marks.
Now perch on top of a step ladder and rotate the feed to get the
horizontal and vertical LNBs back to the right angle. Try not to fall off!
It's probably safer to disconnect the actuator arm and drop the dish down
to get at the feed from ground level. Make your own choice on this one.
I've got good feeds from PAS8 and can get signals in from PAS2 and I701
but the strength is too low to decode anything on the last two at present.
More work required...
Good luck.
Graham
Thank You Kindly Graham |
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