No problem Jean Marc.

It is an easy mistake to make.  The first live TV transmission between The USA and the UK via the Telstar satellite in 1962 gave very poor results. - The UK station was running the wrong sense of circular polarisation.
The same transmission was received in France with much better quality.

Regarding Almical-Sat:    Unfortunately this mornings pass was only 12 degrees above the horizon for me, so I decided not to dust off the AO-40 downconverter on this occasion.  I hope somebody had some success.

73

David


-----Original Message-----
From: Jean Marc Momple <jean.marc.momple@gmail.com>
To: Julien NICOLAS <contact@juliennicolas.com>
CC: amsat-bb@amsat.org <amsat-bb@amsat.org>
Sent: Sun, 6 Jun 2021 11:26
Subject: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission

Dear All,

I made a major error in my statement about polarization (see highlighted text in mail below).

I guess I was confused by my 3cm EME experiments as these days building feeds and a polarization control (with a stepper motor) as Dpol is quite variable between 3B8 and Europe with sudden changes. And for the past weeks always thinking the reverse automatically.

To correct IF THE SATELLITE IS TXing RHCP the ground station must be RHCP.

Thanks to Mathias DD1US to point this out to me.

Please accept my apologies for possibly misleading some.

73


Jean Marc (3B8DU)


On Jun 5, 2021, at 7:06 PM, Jean Marc Momple <jean.marc.momple@gmail.com> wrote:

Julien,

Is it RHCP at the satellite? if so it means that we need LHCP at the station. Please confirm.

I intended to change my 10GHz feed to 2GHz on my 3M dish but only have RHCP 2GHz feeds, thus in case LHCP required no point of doing so.

Please advise

73

Jean Marc (3B8DU)

On Jun 5, 2021, at 6:49 PM, Julien NICOLAS <contact@juliennicolas.com> wrote:

The downlink signal is RHCP.


Le 5 juin 2021 à 15:12, Matthias Bopp <matthias.bopp@dd1us.de> a écrit :

Hello Julien,

what is the polarization of the downlink signal ?

Regards

Matthias

www.dd1us.de


-----Ursprüngliche Nachricht-----
Von: Julien NICOLAS <contact@juliennicolas.com>
Gesendet: Samstag, 5. Juni 2021 11:33
An: amsat-bb@amsat.org
Betreff: [AMSAT-BB] Re: Amicalsat : 6 June S-band Transmission

Hello David,

The modulation of the S-band downlink is GFSK 1Mbps.
A picture transmission is about 3-5 minutes long.

Happy receiving !

Julien F4HVX

Le 5 juin 2021 à 11:14, David G0MRF via AMSAT-BB <amsat-bb@amsat.org> a écrit :

Hi Christophe.

What mode / duration is the picture transmission?

Many thanks

David   G0MRF


-----Original Message-----
From: christophe.mcr <christophe.mcr@gmail.com>
To: Amsat-BB <amsat-bb@amsat.org>
Sent: Sat, 5 Jun 2021 6:23
Subject: [AMSAT-BB] Amicalsat : 6 June S-band Transmission

The 6 June amicalsat will transmit a picture above Europe, US and Asia.
Here is when a transmission will start :
• 09:35 UTC
• 05:58 UTC
• 3:18 UTC
First CW is transmitted during one second, and then the frames follow.
The RTC onboard is not very accurate due to high temperature change, allow up to two minutes drift on the time given. (because this is a planned task in the satellite) The transmission will occur on the S-band coordinated frequency : 2415.300 MHz Due to temperature and hardware limitation the frequency might be a little lower.
For help, and reports please contact us.
Happy receiving !

Garanti sans virus. www.avast.com

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