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Kermit

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Reply with quote  #16 
Quote:
Originally Posted by superhero55


Use this site:
https://satbeams.com/footprints

tells you suggested dish size. Most of Canada C band says 6.2 foot dish.

So you probably just need some fine tuning....
I have a 9' solid so I suspect things may be slightly off. My 1.2m is turned to perfection so almost every Ku signal comes in very well.

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Equipped with Azbox Me, 2 X Octagon SX88, Linkbox 9000i, Geosatpro microHD, Synoq SR1, Openbox S9, Monterrey 90, Uniden SQ560 + SQ360, General Instruments X 5 RECEIVERS, Motorola DSR6000
9' solid Dish C/KU, "Muzak" 1.2m Prodelin + legacy Prodelin 1.2 dish. 
Kermit

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Reply with quote  #17 
Quote:
Originally Posted by photoman76
Is SES 3 your southern most satellite?
If so, maybe a slight elevation adjustment is needed.
I'm at 104 degrees so it's a toss up between SES 3 and SES 11. In the past when we were learning to install systems here everyone recommended using one of the Anik satellites as the true south satellite but now it seems to me like their logic was flawed. I'll definitely try your suggestion & try some minor elevation adjustments & see if that doesn't pick the signal up a bit.

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Equipped with Azbox Me, 2 X Octagon SX88, Linkbox 9000i, Geosatpro microHD, Synoq SR1, Openbox S9, Monterrey 90, Uniden SQ560 + SQ360, General Instruments X 5 RECEIVERS, Motorola DSR6000
9' solid Dish C/KU, "Muzak" 1.2m Prodelin + legacy Prodelin 1.2 dish. 
Skip

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Reply with quote  #18 
Quote:
Originally Posted by bluzee
It seems low for me as well.  I can't pull in PBS  c band feed right now and I usually never have a problem with it.


Two weeks ago I had difficulty pulling in PBS.
Signal was last seen at a 26% on the Icecrypt.
Today I can not find it. I have watched it for decades with no problems.
I live 30 miles from the PBS uplink in Northern Va.
Montana station is viewable.

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photoman76

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Reply with quote  #19 
It's very weak.  Only 6.5 dB on my 10 foot Unimesh dish.
Minimum to lock would be 5.46 dB.
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Reply with quote  #20 
I guess they reduced the power to save money.
Been fiddling with my 10' all day.
Thank you much. 

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Arion

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Reply with quote  #21 
Interesting. No problems at all locking it on my 10’ dish in the U.P. Only qualifier is that if I bump it two steps away from the sweet spot in either direction it’s gone. With most signals even 8-psk you can go several steps in either direction before losing lock.

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10' Tek2000 mesh dish, 24" Venture actuator, ASC1 mover, Titanium LNB, Icecrypt CHD3750, Zgemma H7AC 4K, Octagon SF8008 4K, 1.2 meter motorized KU band dish.
majortom

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Reply with quote  #22 
I haven't checked yet today, but judging by what I see on satsignature expecting reception to be worse if not impossible vs the last observation two weeks ago in post #11. Back then it was about 3 to 4 dB below the strongest Vert TP. Today it looks to be ~ 6 dB below the strongest Vert TP. Remembering that they will never exceed the power shown in their footprint contour maps. That would say it's at least 6 dB down from the stated footprint contour. Probably more.
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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.
DB8E/VHF Yagi rotor FM Bandstop ap-8700 preamp 8way split LG lcd.
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  #23 
brushed 1/2" of slush from the dish. Just as I was thinkin, PBS 103W currently too weak here.
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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.
DB8E/VHF Yagi rotor FM Bandstop ap-8700 preamp 8way split LG lcd.
ricardo's geo-orbit archive: https://web.archive.org/web/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html

jimmypop

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Reply with quote  #24 
wow, what used to be a booming signal for years is now no longer so, sad day indeed!
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Scanning C Band 135º-43º on 10ft'er
& C Band 61º-40º on 7ft'er
from Central Mexico
Kermit

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Reply with quote  #25 
Quote:
Originally Posted by majortom
brushed 1/2" of slush from the dish. Just as I was thinkin, PBS 103W currently too weak here.
I'm glad I'm not alone - during the World Series I noticed that PBS was getting weaker and weaker to the point that I did get any signal at all on that TP. I get perplexed because both polarities come in perfectly on the Ku side. All of my PBS options are starting to disappear. My only choice might be PBS Detroit on our cable TV.

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Equipped with Azbox Me, 2 X Octagon SX88, Linkbox 9000i, Geosatpro microHD, Synoq SR1, Openbox S9, Monterrey 90, Uniden SQ560 + SQ360, General Instruments X 5 RECEIVERS, Motorola DSR6000
9' solid Dish C/KU, "Muzak" 1.2m Prodelin + legacy Prodelin 1.2 dish. 
Kermit

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Reply with quote  #26 
Quote:
Originally Posted by jimmypop
wow, what used to be a booming signal for years is now no longer so, sad day indeed!
my C band was out of commission for the past 2 years. Back in 2016 SES 3 C band was so consistent with a booming signal. All of the Ion's used to be a family favorite. When I moved my dish last month & got it aligned I thought some thing was wrong because the C band side of SES 3 came in so poorly. Even with my PLL LNB I never really had a decent lock on PBS. The only other satellite that comes in poorly for me is the V polarity on the Ku side of G16 with the CBS news feeds.
Sad! [frown]

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Equipped with Azbox Me, 2 X Octagon SX88, Linkbox 9000i, Geosatpro microHD, Synoq SR1, Openbox S9, Monterrey 90, Uniden SQ560 + SQ360, General Instruments X 5 RECEIVERS, Motorola DSR6000
9' solid Dish C/KU, "Muzak" 1.2m Prodelin + legacy Prodelin 1.2 dish. 
birdwatcher_ed

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Reply with quote  #27 
Quote:
It's very weak.  Only 6.5 dB on my 10 foot Unimesh dish.
Minimum to lock would be 5.46 dB.


4 dB on 7.5 dish with Polorotor/Norsat.  I've clicked East and West, and messed around with skew, and to no avail.  What's the minimum to lock on on a 7.5 footer? Is it the same as a 10 footer, 5.46 dB? 

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majortom

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Reply with quote  #28 
Min to lock is determined by the delivery system, modulation and amount of bits dedicated to Forward Error Correction (FEC) being used on a given transponder. While your dish size plays a huge role in the link budget, or what you can achieve CNR wise. It does not really set the minimum requirement.
The uplinker determines them parameters when setting up the link.
Consider DVB-S2 8PSK FEC 9/10 (CBS & ABC use that). The min required is 11 dB. So it goes without saying all other factors being equal, it will be a lot harder to achieve 11 dB on a 7.5' dish than say a 10 or 12 ft dish.
In this case, PBS is using DVB-S QPSK FEC 3/4, where photoman got the 5.5 dB min from.

http://www.satbroadcasts.com/news,81,Minimum_carrier_to_noise_ratio_values_CNR,_CN_for_DVB_S2_system.html


C/N     modcode
2.7,   S1 qpsk 1/2
4.4,   S1 qpsk 2/3
5.5,   S1 qpsk 3/4
6.5,   S1 qpsk 5/6
7.2,   S1 qpsk 7/8
1.0,   S2 qpsk 1/2
2.2,   S2 qpsk 3/5
3.1,   S2 qpsk 2/3
4.0,   S2 qpsk 3/4
4.6,   S2 qpsk 4/5
5.2,   S2 qpsk 5/6
6.2,   S2 qpsk 8/9
6.5,   S2 qpsk 9/10
5.5,   S2 8psk 3/5
6.6,   S2 8psk 2/3
7.9,   S2 8psk 3/4
9.45,  S2 8psk 5/6
10.7,  S2 8psk 8/9
11.0,  S2 8psk 9/10
9.0,   S2 16APSK 2/3
10.2,  S2 16APSK 3/4
11.0,  S2 16APSK 4/5
11.6,  S2 16APSK 5/6
12.9,  S2 16APSK 8/9
13.1,  S2 16APSk 9/10
12.6,  S2 32APSK 3/4
13.6,  S2 32APSK 4/5
14.3,  S2 32APSK 5/6
15.7,  S2 32APSK 8/9
16.1,  S2 32APSK 9/10



__________________
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.
DB8E/VHF Yagi rotor FM Bandstop ap-8700 preamp 8way split LG lcd.
ricardo's geo-orbit archive: https://web.archive.org/web/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html

birdwatcher_ed

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Reply with quote  #29 
Thanks a lot for that info!
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lapac

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Reply with quote  #30 
I'm in SE Michigan. Yep, the SES 3 PBS signal is really low ... it just started this last weekend. I normally record the 8-11pm block and the last solid recording was on 11/11. Thinking it was my setup, I tried changing the dish position but the dish was already at the peak. Every other channel I have programmed on SES 3 locks up normally. I think we should start a letter/email writing campaign. Maybe that will get their attention ...
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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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