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newsy

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Posts: 68
Reply with quote  #16 
Linux drivers for most DVB-S/S2 cards limit minimal symbolrate to 1 MSymbol/s, so if you want to go below you have to modify the driver first.
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85cm motorized dish 31.5°E - 15.0°W
majortom

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Reply with quote  #17 
not really feed hunting related. But it can be useful for sweeping the Sat IF too.
grabbed this from one of the links merkin posted earlier in this thread...
https://github.com/pavels/spektrum

It sweeps pretty fast, and adding the external noise source, you basically have a  poor man's spectrum analyser with tracking generator.
Connected a noise source to a VHF Hi High Pass Filter I designed for my TV antenna several years ago. Output of the filter to the RTL dongle input.,
and let it sweep.
The filter design was from QUCS, if anyone has ever used that.
At the time I built it, I wanted to kill everything below TV VHF High.

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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/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html

majortom

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Reply with quote  #18 
Only takes about 8 or 9 seconds to plot the entire L-band spectrum.
That's not bad at all for a poor man...

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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/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html

midwestmac

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Posts: 2,287
Reply with quote  #19 
Was looking for a place to post this signal I found blind scanning with blindscan-s2 using Prof 7301 . I don't have the RTL sdr.
11830 V 290   SIG -55.4 dBm SNR  13.1 dB DVB-S  QPSK FEC_2_3  INV_ON  PIL_OFF ROL_35

I was able to lock it once but now can't get Tune-s2 to show these same results below again.
If anyone wants to try it I think the SR# is correct.
Its at 95W G3c KU Vertical, Also my LNBF reads 2 mhz high so it might be 11828 V ?
Tuned specs:
System:     DVB-S 5
Frequency:  11830 V 290
22khz:      ON
Modulation: QPSK 0
FEC:        2/3 6
Inversion:  ON 1
Rolloff:    35 0
Pilot:      ON 1
MIS:        -1
Bandwidth:  0.3915 MHz
Data Rate:  0.3563 Mbps
status Unlocked | signal 806514.1 dBm | snr  13.1 dB | ber 0|
status Locked | signal  50.1 dBm | snr  13.1 dB | ber 0| FE_HAS_LOCK




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Azbox Ultra, Pansat 2500, Prof7301,Tbs 6925,5980, Genpix 8psk card, Dektec 2137c, Hauppauge 950q
majortom

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Reply with quote  #20 
DVB-S does not have a 'PILOT'.
Even if it were DVB-S2 where pilots are sometimes used, on a signal that skinny,
I don't think the bandwidth consumption of a Pilot would be tolerable.
could be wrong there, but just sayin..
I do see a signal there on satsignature though.

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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/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html
midwestmac

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Posts: 2,287
Reply with quote  #21 
Quote:
Originally Posted by majortom
DVB-S does not have a 'PILOT'.
Even if it were DVB-S2 where pilots are sometimes used, on a signal that skinny,
I don't think the bandwidth consumption of a Pilot would be tolerable.
could be wrong there, but just sayin..
I do see a signal there on satsignature though.

Thanks you're right I think I need to work on the pilot on tune-s2.. make sure it reads right.
I can't believe you caught that [smile] blindscan-s2 reads it pilot off?


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Azbox Ultra, Pansat 2500, Prof7301,Tbs 6925,5980, Genpix 8psk card, Dektec 2137c, Hauppauge 950q
majortom

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Reply with quote  #22 
all good, wasn't even sure what the tune-s2 fork does with that until I just looked..
what I see reported from the 101W V Heroes TP.

Code:
Tuned specs: 
System:     DVB-S 5
Frequency:  3954 N 2733
22khz:      OFF
Modulation: QPSK 0
FEC:        5/6 5
Inversion:  OFF 0
Rolloff:    35 0
Pilot:      OFF 0
MIS:        -1
FRAME_LEN:  LONG 0
Bandwidth:  3.6896 MHz
Data Rate:  4.1977 Mbps
CN Failure: 6.5 dB



__________________
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/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html
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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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