Re: Gaps in AVHRR images yesterday.
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Sorry for the delay in responding - just seen this 'way down the pile.'
My SNR is always around 13.00 dB in clear sky conditions, so I guess that is not the problem and disabling HVS-1 won't make much difference?
>- check both TelliCast for [ideally] zero packet loss, missed and recovered.
>There are some systems where there is steady stream of missed and recovered
>packets, but with the same count for each. Temporarily disable HVS-1 and
>check again. BAS should have zero packet loss.
This is a bit 'worrying' as I don't remember ever having zero MP's even before HVS-1.
And the old version of Tellicast.
Remember, I have an SR1 that regularly indicates minus (into the 1,000's) value of traffic for up to 5 seconds.
And, as Ernst and I think, we get missed packets when we 'switch on' (use) another quad LNB port on another receiver on the EUMETCast LNB.
At the moment my statistics from 2020-09-10 14:31 (13 days) are:
BS MPb4 FEC 2284. FEC RP 181.
HVS-1 MPb4 FEC 1763 FEC RP 14.
SR1 statistics for same period Bad Frame Count 139. Bad Packet Count 281.
I would not add too much weight to these figures, although through a clear sky period, as I've been moving around in front of the dish doing patio work and we had a period of heavy rain last night.
From: David J Taylor GM8ARV 🏴 🇪🇺 via groups.io <david-taylor@...>
Sent: Mon, 14 Sep 2020 10:14
Subject: Re: [MSG-1] Gaps in AVHRR images yesterday.
I meant to add:
- check your receiver for SNR [Es/No, Carrier-to-noise] unless it's at least
12 dB in clear conditions, I suggest disabling HVS-1 reception.
Unfortunately that means no GOES or Himawari.
Instructions for disabling HVS-1 are on page 16 of the Novra guide:
- check both TelliCast for [ideally] zero packet loss, missed and recovered.
There are some systems where there is steady stream of missed and recovered
packets, but with the same count for each. Temporarily disable HVS-1 and
check again. BAS should have zero packet loss.
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