David

My Es/No is 9.0dB ok for BAS but not good enough for HVS-1. 
The 3 foot dish and LNB haven't been touched for approx.10 years. Certainly worth checking and a new LNB.
What is the favoured LNB at the moment?

Cheers,
Ian

On 17/01/2023 11:39, Ian Hanson wrote:

David, Ernst, John.
Thank you for the detailed explanations, I now have a better
understanding of how the system works. The first thing I will do
is to order a low noise LNB.
Your help appreciated.
Ian

... and, of course, ensure that there is nothing in view of the system which is at "ground" temperature rather than the very low "sky" temperature. From your other dishes I take it you are familiar with the terms.

But once your Es/No (which you didn't give) is adequate, once the system works leave it and enjoy the data!

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

On 16/01/2023 20:42, Ian Hanson wrote:

I am using rx1 for BAS and was hoping to use rx2 for HVS-1.
I didn't realise you can't have two separate settings for the MODCODs.
So if I understand your replys, I can receive BAS or HVS-1 on rx1 by
switching MODCODs but not receive both simultaneously.
For HVS-1 I would need a TBS card and a bigger dish. I have 5 foot and
a 6 foot dish but no mounts, I need to do some thinking.
Regards,
Ian

Ian,

The Ayecka SR1 allows reception of both BAS and HVS-1 by setting the MODCODs to allow both modulation schemes. This is documented in the EUMETSAT guide:

https://www.eumetsat.int/media/45995

in section 5.5.2.2.

What Es/No do you have? See section 5.5.2.4. If it's over 12 dB it's /just/ good enough for BAS and HVS-1 together. Ideally, 13 dB or more.

If you have an SR1, there's no need for an extra card to get both BAS and HVS-1.

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

Ian,

I am not sure we are talking about the same things. Maybe you understand rx1 and rx2 as two configurations that you can store internally? The fact is that the SR1 uses a first generation STV0900AAC chip that has two demodulators. This chip can be connected to two tuners in front and have two RF input plugs. In such a hardware configuration an SR1 can receive two independent DVB-S transponders at the same time. This is called "dual mode". BUT: This does not work with EUMETCast DVB-S2 VCM where you must use the STV0900AAC chip in "single mode" where both demodulators work in parallel for only one transponder. IIRC there were early SR1 models that had two RF (in) plugs and two tuners inside but this was of no help for EUMETCast reception at all. That's why Ayecka issued a cheaper model with only one RF (in) plug . This is similar to the TBS6925 PCIe card and TBS5925 USB box that both have the same STV0900AAC chip but only one RF (in) plug. These DVB-S2 receivers are always used in "single mode". Apparently you have one of these slimmed down SR1 models.

But as I said: The first EUMETCast transponder disseminates both BAS + HVS-1 in the same (8PSK 3/5, 16APSK 2/3, VCM) transport stream. With a big enough and well pointed antenna you need no MODCOD filters. All you have to do is make sure you have the PIDs for BAS + HVS-1 set and tune to transponder C4 (H). Then you can configure and start two Tellicast clients (one for BAS + one for HVS-1) on the PC connected to your SR1. Your PC should have two NICs though (one for the SR1 multicast data traffic, one for your LAN).

Hope this helps,
Ernst

I had to change the heading as I didn't receive my original message to the group
(password problems).