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wejones

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Reply with quote  #31 
  Just moved the dish back to the Arsat-2 position.
I just found a signal at 1449.13 {=3700.87)on the SDR.  It does go away on moving the dish, particularly if I moved it east, but if I moved it west, it stayed around longer, almost as if it were maxed around 81.5 or so. I thought that maybe it could really be coming from the AMC-2 sat, however according to the FCC it should be at 80.85 W, so that's in the wrong direction.  FCC doesn't list anything between 81 and 83.  So I'm not sure why it seems to peak west of 81W.


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Click image for larger version - Name: ARSAT-V-7.jpg, Views: 10, Size: 109.99 KB 

seaveysky

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Reply with quote  #32 
Maybe because N2YO shows Arsat 2 @ 81.12 right now.

Note: They shut down the 3790 H at this time. Both H & V beacons still there.
wejones

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Reply with quote  #33 
Quote:
Originally Posted by seaveysky
Maybe because N2YO shows Arsat 2 @ 81.12 right now.

Note: They shut down the 3790 H at this time. Both H & V beacons still there.


Thanks.  I just came on line to post the same thing.  I looked up the most recent keps, and they show ARSAT just where you said, at 81.12.  They also show AMC-2's inclined orbit varying from 80.76-80.91, so maybe they moved it over a bit to keep it away from AMC-2.
I'm also seeing more than just the ARSAT beacons, so I'm guessing the other signals are from AMC-2.


 


lost_mesa

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Reply with quote  #34 
While looking for the Arsat-2 beacons the other day, I saw the 4199.5 Mhz beacon from AMC-2 come into view for a few hours. It had noticeable modulation on it, similar to AMC-9. I didn't notice any beacon at 3700.5, but I wasn't really looking for it either.
wejones

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Reply with quote  #35 
Looking at Arsat-2 today, not including those bleeding from AMC9,  I'm seeing the following:

949.8 {4200.2} strong  hor  car&sidebands   {note this shouldn't be below 950, but probably LO drift}
949.9 [4200.1}  weak  vert ? several peaks   {note this shouldn't be below 950, but probably LO drift}


1449.15  strong unmod vert
1448.15   weak  unmod  vert

1449.06   weak   unmod  hor
1448.06  strong  unmod  hor

Since there really should only be 4 signals there, 2 from ARSAT2, and 2 from AMC2, I'm starting to think that the "weak" peaks are actually from cross polarization, and that there are really only 3 peaks there. I didn't think this was likely with a Bullzeye feed, as it's pretty obvious which direction is up, but maybe somehow my feed got twisted. But it's strange I don't see this on other sats.  I
   Re the signals being below 950, probably LO drift. I checked with Icom, and they were the same, ie 949.8 and 949.9 .  Also while watching it once, it gave me the impression that it suddenly started showing more modulation.





photoman76

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Reply with quote  #36 
I'm now able to lock it:

Arsat2.jpg 

wejones

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Reply with quote  #37 
Looks like there are 4 strong AOL (?Hughesnet?) transponders on the Ku-H side of this sat.


Modulated beacon at 1448.67 (12198.67)


EDIT: 951.68 (11701.68)   on V side

EDIT2:  ??? 4 AOL signals seem to be gone now???  Beacon still there.

EDIT3:  It just occurred to me that when I observed the 4 AOL transponders, it was almost exactly at one of the twice a day equator crossings of AMC-2.  I'm starting to think that the 4 strong Ku signals were from AMC-2.


wejones

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Reply with quote  #38 
It looks like the 4 strong AOL signals were in fact on AMC-2.  Yesterday, I saw them sometime after 8 AM. I think the EQX time should have been around 8:17 AM if I remember right.  So I checked yesterday evening about 8 PM (the EQX would have been around 8:20 PM) and the signals were there again.  So I'm watching now....  the EQX this morning should be around 8:22 AM.   Sure enough, at first there was no trace of the signals, but about a half hour before the EQX, I started to notice them, and they have grown and grown.
  I'll continue to monitor them, but I'm attaching some images now.


EDIT:   Looks like the signals peaked for me about 5 to 10 minutes after the predicted EQX, which if the calculated times are correct, would equate to an alignment error of 0.07 to 0.15 degrees for my dish, which is likely, since I haven't touched the alignment for a year or two.  But also possible is that the programs are a bit off or that the KEPs are getting a bit old.  I used 2 programs, one that I wrote and one written by T.S.Kelso, which both agreed to within a couple minutes (after I remembered that I still had the programs set to daylight savings time and that leap year hadn't occurred yet).   Anyway, if the calculations are correct, this technique can be used as an aid in alignment.  Since the sat is moving north to south this pass, it indicates that my dish is aimed about 0.1 degree low, ie toward the south horizon, and I need to raise it a tad (not sure declination or elevation or a combination at this point).

Attached Images
Click image for larger version - Name: amc2-H-1.jpg, Views: 24, Size: 152.00 KB  Click image for larger version - Name: amc2-H-2.jpg, Views: 24, Size: 152.64 KB  Click image for larger version - Name: amc2-H-3.jpg, Views: 21, Size: 154.50 KB  Click image for larger version - Name: amc2-H-4.jpg, Views: 20, Size: 158.42 KB  Click image for larger version - Name: amc2-H-5.jpg, Views: 19, Size: 161.87 KB  Click image for larger version - Name: amc2-H-6.jpg, Views: 18, Size: 152.77 KB  Click image for larger version - Name: amc2-H-7.jpg, Views: 21, Size: 158.35 KB  Click image for larger version - Name: amc2-H-8.jpg, Views: 19, Size: 152.34 KB 

seaveysky

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Reply with quote  #39 
Nice detective work wejones!

This proves there's life on inclined sats.
boblop

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Reply with quote  #40 
It could be time to get that 2 or 3 motor dish setup. Chase down those wobblers. $$$$ Gotta spend it all some place.
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Never throw it away--almost never!

TheSatBible

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Reply with quote  #41 
after researching ARSAT-2, based on the coverage and transponder mhz, I say it's likely this satellite is using extended c and ku-band frequencies.  It would make no sense to clobber AMC-2 otherwise if they were the same frequency range as AMC-2.

search results pulling up nothing on its transponder layout to confirm my suspicions.

as for hughesnet, definitely coming from amc-2 - it makes it easy to identify where I am in that part of the arc when I see the multiple hughesnet transponders that change signal strength or go away over the course of a few hours.


TheSatBible

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Reply with quote  #42 
Still have not found any arsat-2 transponder layout but i'm getting more convinced it shares the same freqs as amc-2. I see a satellite from Argentina is coordinated for 3700-4200 MHz cband and 11700-22200 MHz ku band. I waited tonight until amc-2 was at its maximum inclination away from its equator crossing. Nothing observed on ku-band but I did find lots of data carriers occupying about 25 MHz of bandwidth on cband. I'm very sure that is not coming from amc2 and I'll followup when amc2 makes an equator crossing soon to verify those data carriers have not increased in signal strength.

I suppose arsat and ses are coordinating with each other and ses has given arsat permission to light up some of their operating frequencies in an area where amc2 does not have any current activity.

lost_mesa

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Reply with quote  #43 
Here is a link to the transponder layout for Arsat 2:

http://frequencyplansatellites.altervista.org/ARSAT/Arsat_2.pdf

Also they have an application in at the FCC to put Arsat 2 on the "Permitted Space Station List". That would allow uplinkers in the U.S. to use it without having to apply for specific permission. Details here, along with frequencies, footprints, and lots of other info:

http://licensing.fcc.gov/myibfs/download.do?attachment_key=1129152

It also mentions that AMC-2 is going to be repositioned in June 2016, but doesn't say were.

TheSatBible

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Reply with quote  #44 
the fcc filing slipped by my goalie!  [wink]  That's the best and easiest way I know of to get frequency plans and such (and in fact ARSAT's frequency plan is included in the filing that was posted).

I'll have to go dig up the FCC call sign for ARSAT-2 to get more good tech info on the bird beyond what is disclosed in the "cover letter" whose link was posted.

as for the transmissions I reported last night, things are not making sense.  They strengthen and weaken as AMC-2 comes/goes from its equator crossing so that makes it seem like it's coming from AMC-2.  The fact the signals are not gone or that weak when AMC-2 is furthest from its equator crossing makes me think it's ARSAT-2.   Bottom line - until AMC-2 moves, I don't know what to believe about where those 25-MHz worth of data carriers are coming from.








photoman76

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Reply with quote  #45 
Here is what I see on the BLSA on Arsat 2 C band at this time:

Arsat2.jpg 
There seems to be a number of narrow signals between 3800 and 3822 Horizontal.

I can't lock anything.  It appears to be there 24/7.

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