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EUMETCast comparison of transponders 1 & 2

Link Margin (some are calculated)
Transponder 2 - 10E 11387H
TBS6903
TP2
Ayecka SR1 #3
TP2
Transponder 1 - 10E 11263H
TBS6903
TP1
Ayecka SR1 #2
TP1
BS/HVS-1 link margin

TelliCast
- lost packets
Transponder 2 - 10E 11387H

HVS-2 lost packets
TP2
PC Lund TBS6903

HVS-2 lost packets
TP2
PC Stamsund Ayecka SR1
Transponder 1 - 10E 11263H

HVS-1 lost packets
TP1
PC Lund TBS6903

Traffic - all PIDs
Transponder 2 - 10E 11387H
TBS6903
TP2
Ayecka SR1 #3
TP2
Transponder 1 - 10E 11263H
TBS6903
TP1

SNR - signal-to-noise ratio
Transponder 2 - 10E 11387H
TBS6903
TP2
Ayecka SR1 #3
TP2
Transponder 1 - 10E 11263H
TBS6903
TP1
Ayecka SR1 #2
TP1

BER - bit error rate
Transponder 2 - 10E 11387H
TBS6903
TP2
Ayecka SR1 #3
TP2
Transponder 1 - 10E 11263H
TBS6903
TP1
Ayecka SR1 #2
TP1

RF level - higher plot means lower signal
Transponder 2 - 10E 11387H
TBS6903
TP2
Ayecka SR1 #3
TP2
Transponder 1 - 10E 11263H
TBS6903
TP1
Ayecka SR1 #2
TP1

Other periods: day week month year

This data is taken from PCs fed by Ayecka SR1 IP and TBS receivers.  The RF feeds are shown in red.  The antenna is pointed to the EUTELSAT 10A satellite at 10° E.  Readings are taken every five minutes, and X-axis times are in UTC.  From late September 2017 the main RF feed has been changed to have a 4-way splitter - there's enough signal to allow this, otherwise an in-line amplifier could have been added.  The four outputs are used to feed the three main receivers.  Output two from the LNB is used purely for HVS-1, three is used for HVS-1 and HVS-2 in a single-cable, dual-tuner arrangement, and output four allows direct access to the LNB for polarisation tests, which would otherwise interfere with routine reception.

Two receive PCs are fed from the Traffic LAN ports of the Ayecka SR 1 IP receivers on a private LANs (192.168.10.x/20.x) via GS605 Netgear switches, with 1 Gbps network cards added to the receiver PCs.  An Edimax USB2.0-Ethernet adapter is an alternative because of better drivers.  PC Stamsund is fed from a TBS5925 USB 2.0 box.  Ayecka SR1 #2 receiver takes only HVS, received and processed by PC Kiruna.  From Feb-2017 PC Lund monitors HVS-1 & HVS-2 with a single-cable TBS6903 dual-tuner PCIe card.

The Ayecka SR1 Management ports are connected to the existing 192.168.0.x house LAN, through which management access is possible from any local PC.

125 cm antenna with quad-output LNB pointed at 10A
                  

Output 1     Output 2   Output 3       Output 4
|| ||     || ||

4-way splitter

  || 2-way splitter     ||
DC-pass        RF only      RF only   RF only  || DC-pass   RF only  ||
||     ||     ||     || || || || ||
Ayecka
SR1 #1
BS only
TBS5925
USB
BS only
Ayecka
SR 1 #3
HVS-2 only
(spare)
 
 
Ayecka
SR1 #2
HVS-1 only
TBS6903
dual-tuner
PCIe
(spare) TBS5925
box
USB        pass-through
| | | ||
1 Gbps
Ethernet
USB 2.0
|
1 Gbps
Ethernet
1 Gbps
Ethernet
PCIe
card
USB 2.0
|
||
||
| | | Airspy SDR
Spectrum analyser
<==Private LAN==> | <=Private LAN=> | |
|     | | | |
i5-760 PC
Alta
Receive BS
 Process BS 
i5-4460 PC 
Harstad
 
 Receive BS 
i5-3330 PC
Stamsund
BS  RX & process
HVS-2 RX & delete
i7-4770K PC
Kiruna
 Process BS
 HVS rec. & proc.
 i5-6400 PC
Lund
 
 Receive HVS 1 & 2
 Tablet PC
Gavle

Tests

Transponder spectrum & constellation comparison

 
Copyright © David Taylor  Edinburgh SatSignal home page Last modified: 2017 Oct 19 at 13:32:31