Vipersan
Emmett Browns Ghost
- Joined
- Jun 29, 2009
- Messages
- 10,918
- Reaction score
- 6,663
- Points
- 113
- Age
- 66
- My Satellite Setup
-
IP9000HD +
TD110 Dish and TD88 Dish in Tandem
66°East to 60°West.
AZbox PrmHD + OpnbxS9HD + Skybox + DrHD F15
2x VboxII AZ-EL
2 m+ Alcoa PF + BSC421 C-Band lnbf...
+SS2/TwHnS2-3200 pci/TBS6925 pci
1.5 Fortec Star -Gbox - HtoH Ku/Ka/C
- My Location
- UK
Hmmm ..
This is just a theory ...but I couldn't help noticing that when the BER was at it's worst ...and the Newsroom unlockable but the adjacent channel carry ACM VCM data was wildly varying QPSK 8PSK 16PSK ..etc
But am getting a more stable almost lockable signal now ...and the adjacent channel is steady-ish at 32PSK..
Now this data channel is very close frequency wise...possibly too close...and digital data as we know can cause bleed over and interference ..
I'm wondering if the modulation type (ACM/VCM) when Q or 8PSK is causing trouble for the close proximity newsroom channel when large quantities of data are being transmitted...and less so when in a steady 32PSK mode.
This would not cause issues for the intended recipients if their receivers used narrow band filtering..
One for the experts perhaps ?
your thoughts please ...or am I just barking...
Our commercial receivers are designed to accommodate wide band signals used in DBS muxes ..
maybe theirs are not ..
after all they Always use the same narrow bandwitdth and low SR 3629.
maybe this is not the case with the data channel.
This is just a theory ...but I couldn't help noticing that when the BER was at it's worst ...and the Newsroom unlockable but the adjacent channel carry ACM VCM data was wildly varying QPSK 8PSK 16PSK ..etc
But am getting a more stable almost lockable signal now ...and the adjacent channel is steady-ish at 32PSK..
Now this data channel is very close frequency wise...possibly too close...and digital data as we know can cause bleed over and interference ..
I'm wondering if the modulation type (ACM/VCM) when Q or 8PSK is causing trouble for the close proximity newsroom channel when large quantities of data are being transmitted...and less so when in a steady 32PSK mode.
This would not cause issues for the intended recipients if their receivers used narrow band filtering..
One for the experts perhaps ?
your thoughts please ...or am I just barking...
Our commercial receivers are designed to accommodate wide band signals used in DBS muxes ..
maybe theirs are not ..
after all they Always use the same narrow bandwitdth and low SR 3629.
maybe this is not the case with the data channel.
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