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phkarmur

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Posts: 38
Reply with quote  #1801 
Hi,

I have some problems in my Linux server for TBS 6908 cards.
Here are my system information.

Code:

root@RF-Parbat-Test:~# uname -a
Linux RF-Parbat-Test 4.12.0-rc6+ #1 SMP Wed Jul 26 00:12:00 CDT 2017 x86_64 x86_64 x86_64 GNU/Linux
root@RF-Parbat-Test:~# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                32
On-line CPU(s) list:   0-31
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Model name:            Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz
Stepping:              7
CPU MHz:               1199.865
CPU max MHz:           3300.0000
CPU min MHz:           1200.0000
BogoMIPS:              5201.16
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              20480K
NUMA node0 CPU(s):     0-7,16-23
NUMA node1 CPU(s):     8-15,24-31


Problems:
  1. RF graph (spectrum scan) is not 100% same compare to Windows (CrazyScan) with same signal and same DVB card.
  2. In blind scan, I get plus 1 or 2 MHz freq in almost every transponder with compare to CrazyScan and LyngSat.
  3. I can not find SNR in tbs cards, I got 0 SNR but I can find SNR for Prof 7500
  4. And some time I can not get current constellation picture

1) RF Graph comparison: 
RF-issue.png 

RF graphs are identical to each other, technically its correct but in CrazyScan graph range is big while in here, range is too small.

For example here crazyscan's graph range is ~ -45 to -60 (total range is 15 dBm) but in Linux its ~ -40 to -45 (total range is 5 dBm).



2) Wrong Freq:
in Linux with TBS card:
wrongFreq.JPG 
In LyngSat:
WrongFreq2.JPG 

3) Can't find SNR:
Please check about picture (for wrong freq in Linux), you can see SNR = 0 there.

4) Constellation Picture:
I got wrong freq, its should be 3877 (reference from LyngSat.com) and still I can get TS stream but got bad constellation picture!

pic1.JPG 
Here is original picture:
pic2.JPG 



Thank you [smile]


majortom

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Posts: 4,937
Reply with quote  #1802 
Doesn't look like anything I have seen.
Are you going to publish your program and the fixes for your TBS 6908 Card?



__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
phkarmur

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Posts: 38
Reply with quote  #1803 
no, just for internal uses 
majortom

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Posts: 4,937
Reply with quote  #1804 
Ok, let us know when you have it fixed.
__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
phkarmur

Registered:
Posts: 38
Reply with quote  #1805 
ok, do you have any suggestions? 
majortom

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Posts: 4,937
Reply with quote  #1806 
No I do not have or use your program, nor do I have or use your hardware.basically, thinking you are on your own since you are the only one with your program and your hardware.


__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
DarkSky

Registered:
Posts: 2,247
Reply with quote  #1807 
They freq difference of a meg or 2 is normal between devices and you may not get the same the next time you scan with the same device and with the SR pretty much the same story.

Quoting Rick at the bottom of this forum's main page:

"Different receivers and LNB's will give you different Frequencies and Symbol Rates."

As far as the other since you refuse to post your code; no one has any clue what you have done and can not make any suggestions so I have to back up what majortom's response was above on the other matters.
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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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