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aus+uk / uk.tech.digital-tv / Re: Satellite Dish Bearing

SubjectAuthor
* Satellite Dish BearingJeff Gaines
+- Re: Satellite Dish BearingIndy Jess John
+* Re: Satellite Dish BearingAndy Burns
|+- Re: Satellite Dish Bearingcharles
|+* Re: Satellite Dish BearingR. Mark Clayton
||+- Re: Satellite Dish Bearingcharles
||`* Re: Satellite Dish BearingPaul Ratcliffe
|| `* Re: Satellite Dish BearingBrian Gregory
||  `* Re: Satellite Dish BearingDavid Woolley
||   `* Re: Satellite Dish BearingR. Mark Clayton
||    `* Re: Satellite Dish BearingNY
||     +* Re: Satellite Dish BearingDavid Woolley
||     |+- Re: Satellite Dish Bearingwilliamwright
||     |`* Re: Satellite Dish BearingR. Mark Clayton
||     | `* Re: Satellite Dish BearingR. Mark Clayton
||     |  `- Re: Satellite Dish Bearingwilliamwright
||     +- Re: Satellite Dish BearingDavid Woolley
||     `- Re: Satellite Dish Bearingwilliamwright
|`- Re: Satellite Dish BearingMartin
+- Re: Satellite Dish Bearingcharles
+* Re: Satellite Dish BearingJeff Gaines
|+* Re: Satellite Dish Bearingcharles
||`- Re: Satellite Dish BearingAndy Burns
|+* Re: Satellite Dish BearingR. Mark Clayton
||`* Re: Satellite Dish BearingJava Jive
|| `- Re: Satellite Dish BearingR. Mark Clayton
|+* Re: Satellite Dish BearingDave W
||`* Re: Satellite Dish BearingBrian Gregory
|| `- Re: Satellite Dish Bearingwilliamwright
|`* Re: Satellite Dish Bearingtony sayer
| `* Re: Satellite Dish BearingDavid Woolley
|  `- Re: Satellite Dish Bearingtony sayer
+* Re: Satellite Dish Bearingwilliamwright
|+* Re: Satellite Dish BearingAndy Burns
||`- Re: Satellite Dish Bearingalan_m
|`* Re: Satellite Dish BearingDavid Woolley
| `* Re: Satellite Dish BearingR. Mark Clayton
|  `* Re: Satellite Dish BearingDavid Woolley
|   `- Re: Satellite Dish BearingR. Mark Clayton
+* Re: Satellite Dish Bearingalan_m
|+* Re: Satellite Dish BearingJeff Gaines
||+* Re: Satellite Dish BearingAndy Burns
|||`- Re: Satellite Dish BearingR. Mark Clayton
||`* Re: Satellite Dish Bearingalan_m
|| `* Re: Satellite Dish BearingJeff Gaines
||  `* Re: Satellite Dish BearingJava Jive
||   `* Re: Satellite Dish Bearingalan_m
||    `- Re: Satellite Dish BearingJava Jive
|`* Re: Satellite Dish BearingBrian Gregory
| +* Re: Satellite Dish BearingAndy Burns
| |`- Re: Satellite Dish Bearingalan_m
| `- Re: Satellite Dish Bearingalan_m
+* Re: Satellite Dish BearingRobin
|`- Re: Satellite Dish BearingR. Mark Clayton
`* Re: Satellite Dish BearingJeff Gaines
 `* Re: Satellite Dish Bearingwilliamwright
  `- Re: Satellite Dish BearingJeff Gaines

Pages:123
Re: Satellite Dish Bearing

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From: dav...@ex.djwhome.demon.invalid (David Woolley)
Newsgroups: uk.tech.digital-tv
Subject: Re: Satellite Dish Bearing
Date: Sun, 17 Apr 2022 19:23:26 +0100
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 by: David Woolley - Sun, 17 Apr 2022 18:23 UTC

On 17/04/2022 16:09, NY wrote:
> When a dish is installed, is one the adjustments the rotation of the
> dish so H and V on the dish are accurately aligned with the H and V
> signals (ie adjust for max H and min V on a known H-polarised frequency).

The skew adjustment is normally done on the LNB mounting, rather than on
the dish proper. E.g. <http://www.satcure.co.uk/tech/LNB_skew.htm>.

Re: Satellite Dish Bearing

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From: wrightsa...@f2s.com (williamwright)
Newsgroups: uk.tech.digital-tv
Subject: Re: Satellite Dish Bearing
Date: Mon, 18 Apr 2022 03:50:17 +0100
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 by: williamwright - Mon, 18 Apr 2022 02:50 UTC

On 17/04/2022 16:09, NY wrote:

> What about the frequencies where there is a service on both H and V. For
> example (for Astra 28.x): 11264H and 11264V, 11306H and 11306V, 11344H
> and 11344V, 11386H and 11386V, 11426H and 11426V. I presume the
> frequency figures are nominal and that 11264H and 11264V are actually on
> slightly different frequencies, but is it enough to avoid H versus V
> interference, when everywhere else in the spectrum there is a gap of at
> least 10 MHz between an H and a V.

When there are signals on opposing polarisations it just worsens the BER
a bit.
>
> When a dish is installed, is one the adjustments the rotation of the
> dish so H and V on the dish are accurately aligned with the H and V
> signals (ie adjust for max H and min V on a known H-polarised frequency).

No the dish stays still. You twist the LNB (it's called polarity offset)
and aim for the best BER. Then you have to remember to tighten the LNB
clamp.

There used to be a problem with the old magnetic polarisers. Any given
voltage to the coil produced different polarity twist depending on
frequency. But nowadays the LNBs have two probes at right angles so that
doesn't happen.

Bill

Re: Satellite Dish Bearing

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From: wrightsa...@f2s.com (williamwright)
Newsgroups: uk.tech.digital-tv
Subject: Re: Satellite Dish Bearing
Date: Mon, 18 Apr 2022 03:51:23 +0100
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 by: williamwright - Mon, 18 Apr 2022 02:51 UTC

On 17/04/2022 19:14, David Woolley wrote:
> On 17/04/2022 16:09, NY wrote:
>> I presume the frequency figures are nominal and that 11264H and 11264V
>> are actually on slightly different frequencies, but is it enough to
>> avoid H versus V interference,
>
> The signals are several MHz wide.  You can't fit in two multiplexes
> without most of them overlapping each other.

Each multiplex is err, I can't remember, about 12MHz wide I think. Very
wide anyway.

Bill

Re: Satellite Dish Bearing

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Subject: Re: Satellite Dish Bearing
From: notyalck...@gmail.com (R. Mark Clayton)
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 by: R. Mark Clayton - Mon, 18 Apr 2022 11:10 UTC

On Sunday, 17 April 2022 at 19:14:55 UTC+1, David Woolley wrote:
> On 17/04/2022 16:09, NY wrote:
> > I presume the frequency figures are nominal and that 11264H and 11264V
> > are actually on slightly different frequencies, but is it enough to
> > avoid H versus V interference,
> The signals are several MHz wide. You can't fit in two multiplexes
> without most of them overlapping each other.

Correct - Transponders with the same polarisation do not overlap, but the transponders with the other polarisation sit in between. As long as your LNB is accurately set up then the polarisation will mean that on frequency the polarisation of the adjacent channel will be nulled out.

Re: Satellite Dish Bearing

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Subject: Re: Satellite Dish Bearing
From: notyalck...@gmail.com (R. Mark Clayton)
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 by: R. Mark Clayton - Mon, 18 Apr 2022 11:15 UTC

On Monday, 18 April 2022 at 12:10:34 UTC+1, R. Mark Clayton wrote:
> On Sunday, 17 April 2022 at 19:14:55 UTC+1, David Woolley wrote:
> > On 17/04/2022 16:09, NY wrote:
> > > I presume the frequency figures are nominal and that 11264H and 11264V
> > > are actually on slightly different frequencies, but is it enough to
> > > avoid H versus V interference,
> > The signals are several MHz wide. You can't fit in two multiplexes
> > without most of them overlapping each other.
> Correct - Transponders with the same polarisation do not overlap, but the transponders with the other polarisation sit in between. As long as your LNB is accurately set up then the polarisation will mean that on frequency the polarisation of the adjacent channel will be nulled out.

Just double checked - for $ky on 28E they used H & V on the same frequency on a lot of transponders - you LNB skew will need to be very accurate in this case.

Re: Satellite Dish Bearing

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From: wrightsa...@f2s.com (williamwright)
Newsgroups: uk.tech.digital-tv
Subject: Re: Satellite Dish Bearing
Date: Mon, 18 Apr 2022 13:04:20 +0100
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 by: williamwright - Mon, 18 Apr 2022 12:04 UTC

On 18/04/2022 12:15, R. Mark Clayton wrote:
> Just double checked - for $ky on 28E they used H & V on the same frequency on a lot of transponders - you LNB skew will need to be very accurate in this case.

That's right. Strangely all that happens (if the offset is done right)
is that the BER is a bit worse; not enough to matter.

Bill

Re: Satellite Dish Bearing

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From: ton...@bancom.co.uk (tony sayer)
Newsgroups: uk.tech.digital-tv
Subject: Re: Satellite Dish Bearing
Date: Wed, 20 Apr 2022 12:37:12 +0100
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 by: tony sayer - Wed, 20 Apr 2022 11:37 UTC

In article <t3ekl6$8bu$1@dont-email.me>, David Woolley <david@ex.djwhome
..demon.invalid> scribeth thus
>On 16/04/2022 14:16, tony sayer wrote:
>> Satellites are marked in their position of degrees East and West of due
>> south thats 180 deg! so as near as dammit Astra 28.2 will be 180 Minus
>> 28.2 is 151.8
>
>No they are not. They are labelled by the longitude that they are over
>at the equator. In the extreme case, of someone on the equator, their
>azimuth is 90° or 270°. If you are at longitude 0, on the equator, the
>angle to them below the vertical will still be larger than their station
>position, because it is measured from the Earth's surface, whereas the
>satellite position is relative to the centre of the Earth.
>
>At the exact poles, the azimuth will be the nominal position, but due
>South will be indeterminate, so you will need to use the prime meridian
>as the reference. (More of a problem is that the elevation will be
>negative, by about 8.5°.)
>
>Elsewhere, on the prime meridian, azimuth, for most practical targets is
>likely to be larger than the nominal position, although, for 90° and
>270° positions it will be slightly smaller, because azimuths 90° and
>270° are along a parallel of latitude but the satellites are over a more
>southerly one (northern hemisphere).
>
>For the gory details of the maths, including corrections for the
>non-spherical Earth, see
><https://www.ngs.noaa.gov/CORS/Articles/SolerEisemannJSE.pdf>. The
>parameter used to specify positions is what the article calls
>sub-satellite point longitude.
>

Yes all quite right but i was opting for a simple explanation rather
than write a book;!
--
Tony Sayer

Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.

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