Re: HVS-1 data


Ernst Lobsiger
 

On Tue, Nov 9, 2021 at 06:56 AM, Terence O'Hanlon Smith wrote:
The Snr, sadly, is 8.2
Terence,

as you said you had HVS-1 reception with your SR1 this sounds like a pointing problem of your antenna (or maybe a bad LNB or HF connector?).

As mentionned a couple of times on this list, you must have a minimum SNR per MODCOD. If your SNR is above, you have some Link Margin (LM):

Basic Service  MODCOD     8psk 3/5 --> LM = SNR - 5.9  [dB]
HVS-1, HVS-2 MODCOD 16apsk 2/3 --> LM = SNR - 9.3 [dB]

EUMETSAT recommends a LM of 4 dB (!) but your LM for HVS-1 is below 0. No chance to receive HVS-1 that way. As I said you need SNR>=12 dB.

Cheers,
Ernst

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