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  2. Es Hail 2 LNB Antidrift

Re: Es Hail 2 LNB Antidrift

Mr VILLAIN Laurent
 

Hello Simon.

Sorry, I was answering two emails in the same time.

Yes thats why the satellite must be kept in the cube of 25 kms side.

A perfectly stable geostationary orbit is an ideal that can only be approximated. In practice the satellite drifts out of this orbit because of perturbations such as the solar wind, radiation pressure, variations in the Earth's gravitational field, and the gravitational effect of the Moon and Sun, and thrusters are used to maintain the orbit in a process known as station-keeping.

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On Fri, Dec 28, 2018 at 4:13 PM +0900, "Simon Brown" <simon@...> wrote:

Laurent,

 

Please read the Wikipedia page.

 

Simon Brown, G4ELI
www.sdr-radio.com

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Mr VILLAIN Laurent
Sent: 28 December 2018 00:57
To: main <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] Es Hail 2 LNB Antidrift

 

Hello Simon, good morning.

 

The GEO sat should stay inside a cube of 25 kms side, to be seen fixed at Earth level, if it's what you mean about "actually orbit".

 

73 Laurent / HL2/F4AAR.

 

De: "Simon Brown" <simon@...>
À: "main" <main@SDR-Radio.groups.io>
Envoyé: Vendredi 28 Décembre 2018 05:07:41
Objet: Re: [SDR-Radio] Es Hail 2 LNB Antidrift

 

Hi,

 

If you look at the Es’Hail 2 status (or status for any GEO satellite) you’ll see it does actually orbit. At 10GHz this can have as much as 50Hz offset I think, right now it’s 25Hz offset at 10GHz.

 

More info: https://en.wikipedia.org/wiki/Geosynchronous_orbit

 

Below is the latest Es’Hail 2 status.

 

 

 

Simon Brown, G4ELI
www.sdr-radio.com

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Mr VILLAIN Laurent
Sent: 27 December 2018 10:59
To: main@sdr-radio.groups.io; main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] Es Hail 2 LNB Antidrift

 

"There will be some Doppler even though Es’Hail 2 is a GEO satellite " => could you explain it ???

 

73 Laurent.

 

De : main@sdr-radio.groups.io de la part de Klaus Hutschenreuther <klaus.hutschenreuther@...>
Envoyé : jeudi, décembre 27, 2018 7:46 PM
À : main@sdr-radio.groups.io
Objet : Re: [SDR-Radio] Es Hail 2 LNB Antidrift

 

Hi,

 

You can take a look at the following:

 

https://loetlabor-jena.de/doku.php?id=projekte:3cmplllnb:start

 

http://www.dg0opk.darc.de/Octagon_LNB_mod_March2017.html

 

Klaus Hutschenreuther

 

Von: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] Im Auftrag von Simon Brown
Gesendet: Donnerstag, 27. Dezember 2018 09:55
An: main@SDR-Radio.groups.io
Betreff: Re: [SDR-Radio] Es Hail 2 LNB Antidrift

 

Hi,

 

The answer is no. I’ll be on Es’Hail 2 myself, so will look at the LNB issue once I have a dish and LNB organised. There will be some Doppler even though Es’Hail 2 is a GEO satellite.

 

As soon as Es’Hail 2 has been commissioned I’ll get a dish ordered and look at this issue.

 

Simon Brown, G4ELI
www.sdr-radio.com

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of floroy42@...
Sent: 26 December 2018 14:20
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Es Hail 2 LNB Antidrift

 

Hello OMs,

it is possible with SDR Radio to lock on a signal (like AFC with FM) and receive with an second VFO another signal in USB which follows the lock on the first signal?

The problem is that the used LNBs for reception of EsHail2 Sat often drift several 100Hz in a few minutes.

On the narrow band HAM transponder two frequency-stable beacons are planned on the lower and upper band edge.

If you can lock to one of these beacons und demodulate any SSB signal between those following the drift of the beacons you won't have to retune every few seconds.

Anyone an idea?

vy73 DB8TF

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