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photoman76

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Reply with quote  #1 
There is a new satellite at 81 degrees West.
Arsat-2 is an Argentina satellite, but appears to have North American coverage.
http://satelitesarsat.com.ar/site/default/page/view/arsat2_cobertura

There is currently one signal on C band at 3788 H 6884, but I can't lock it.

Arsat2Constellatiion.jpg 

Arsat2BLSA.jpg

I'm not seeing any signals on ku at this time.

seaveysky

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Reply with quote  #2 
I have also noticed this.  Today it has been seen off and on indicating it might be some kind of test signal.  As of right now, looks like a beacon or a very narrow carrier has replaced it..

Edit:  Back to what it was before..
wmhj

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Reply with quote  #3 
information on arsat-2

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wmhj

wejones

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Quote:
Originally Posted by photoman76
There is a new satellite at 81 degrees West.
Arsat-2 is an Argentina satellite, but appears to have North American coverage.
http://satelitesarsat.com.ar/site/default/page/view/arsat2_cobertura

There is currently one signal on C band at 3788 V 6884, but I can't lock it. 


??  I'm seeing it on horizontal.  Maybe they were testing on V and now on H??
Similar results though, the same constellation, and I can't lock it. 


photoman76

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Quote:
Originally Posted by wejones


??  I'm seeing it on horizontal.  Maybe they were testing on V and now on H??
Similar results though, the same constellation, and I can't lock it. 




You are right, it's Horizontal.
The skew on the satellite tile I added to the 4dtv for the new satellite was set backwards.
lost_mesa

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Thanks for the heads up about Arsat-2. I'm also seeing the same constellation on horizontal.
boblop

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So this morning there is that single narrow tp at 3789. Horizontal with symbol rate at 6885 KS/s and fec 2/3 and DVB-S2 modulation 8PSK with bitrate 13.637 Mbit/s and carrier width of 9.294 MHZ. Clean at 17.5 db s/n.

I guess we still need "more stuff" cause I know nothing else at the moment.

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wejones

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Quote:
Originally Posted by boblop
So this morning there is that single narrow tp at 3789. Horizontal with symbol rate at 6885 KS/s and fec 2/3 and DVB-S2 modulation 8PSK with bitrate 13.637 Mbit/s and carrier width of 9.294 MHZ. Clean at 17.5 db s/n.

I guess we still need "more stuff" cause I know nothing else at the moment.


???  Does this mean you were able to lock it???
  If so, what receiver did you use to lock it?

Also, it's interesting that you're saying 8PSK, when the constellation is clearly QPSK. Also that bitrate corresponds to 8PSK, but it can't be putting out that many bits, so that must be a calculated rate.  That makes me think that the signal is ACM/VCM, but is spending 99.9% of it's time in QPSK and only a low % of it's time in 8PSK.  
But I'm still curious re why no lock.  Perhaps a proprietary format.  Perhaps because it obviously has little or no data on the stream since it spends most of it's time sending the same byte. 
 
Out of curiosity, I fed it into my old Broadlogic 1030, mainly because that receiver would often get a "signal lock" but no "data lock" on some non DVB-S modes.  Sure enough, it pops into signal lock, but then it drops out of signal lock, then back in.  I tried to watch the signal lock while switching over to see what FEC the program was trying at the time, and what SNR it was indicating.  It seemed to be somewhat random relative to when it was getting a signal lock, but seemed to most often correspond to 5/6, 3/4 ,   less often at 7/8, and almost never at 1/2 or 2/3.  However these observations were probably confused by the fact that the Broadlogic was trying to also vary the freq as well as the FEC, in an attempt to get a lock.  
   But anyway, I'm curious re how you determined the FEC and DVB-S2 8PSK and bitrate. 
   Also curious re how Photoman found the SR?  Did the BLSA give that info or was that obtained via the shortwave method?


cpsp0

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Reply with quote  #9 
A sat at 81W brings back lots of memories. I got my first BUD in 1989, before there was NFL Sunday Ticket. You could find just about every game on KU in those days. NBC had the AFC and had several feeds on 81W ( I think it was named K-1 or K-2, can't recall for sure), which was there home satellite like 72W is today. The CBS games of the NFL usually showed up on same satellites week after week. Monday Night Football was still on ABC then, not ESPN. With a bud back then you could catch just about every NFL game, every week. Those were the days!
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wejones

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OOPs.....
   Right after posting the above, I looked at the transponder again with Crazyscan, and the Constellation has changed a LOT.   Looks like now all 4 QPSK spots are active, and it looks like there could be some 8PSK or higher modulations too.  So maybe that was what BOBLOP was seeing.

However I still can't lock it.  


EDIT:  Now the QPSK appearance is gone.  Just a big fuzzy donut, then the whole thing filled in, like they're testing different modulations.

EDIT2:  It switched back to QPSK with 4 spots, then back to QPSK with mainly 1 spot again.  BTW, I'm about 3 dB lower SNR than yesterday.

wejones

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Quote:
Originally Posted by cpsp0
A sat at 81W brings back lots of memories. I got my first BUD in 1989, before there was NFL Sunday Ticket. You could find just about every game on KU in those days. NBC had the AFC and had several feeds on 81W ( I think it was named K-1 or K-2, can't recall for sure), which was there home satellite like 72W is today. The CBS games of the NFL usually showed up on same satellites week after week. Monday Night Football was still on ABC then, not ESPN. With a bud back then you could catch just about every NFL game, every week. Those were the days!


K2 was at 81.   K1 was at 85.

http://www.eskerridge.com/bj/sat/tvrosat2.html

I used those sats for NFL too. I upgraded to Ku in 1990.  Before that, NBC also usually had one game on C-band up at the west end of the ARC, like maybe F1r or C1??
boblop

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Reply with quote  #12 
Yes, I need more stuff!

I think that signal that I have now locked 6 times is likely not there "all" the time.

TBS 5925 and EBSpro of course here.

I think that vertical first taller pulse likely a marker beacon signal was not there earlier this morning. I need to take pictures more often.
I see by taking several repeated scans that it "appears" those marker beacon signals read in as perhaps a different peak level on different scans.
I can think of several reasons why this could be.
But with the spectrum analyzer it looks like several different freqs are there but as on and off signals. Thus they change too fast for the TBS 5925 and EBSpro software to report correctly what is really there.

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wejones

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Quote:
Originally Posted by boblop
Yes, I need more stuff!

I think that signal that I have now locked 3 times is likely not there "all" the time.

TBS 5925 and EBSpro of course here.

I think that vertical first taller pulse likely a marker beacon signal was not there earlier this morning. I need to take pictures more often.


The not there all the time comment made me try to just sit here and click the tune button over and over.  After about 30 attempts, I got it to lock twice with the 6925.  Haven't got it to lock yet with the 6983.
This constellation reminds me a lot of the old NOAAPORT transponder, except that one spent more time in 8PSK.

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seaveysky

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Reply with quote  #14 
I see they turned on the C band vertical beacon today (I believe AMC-2 [GE-2] is now off equator).

Since I don't have the accuracy required, both V and H beacons can be seen around the 3700 mark
if one flips the polarity.


boblop

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Reply with quote  #15 
I see my s/n has now fallen to around 10 db. Interesting to watch this fresh sat. Wonder what will be there in a few more days?

That brings up the question of does anyone know all there is to know about sat beacon signals?

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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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