11007V on 28E

N

NoviceSat

Member
My Satellite Setup
Technomate 5300D M2 + 2600 + 80cm mesh dish
My Location
SW England
According to TBS Blindscan on my TBS 5925 there is a transponder at 28E that uses 16APSK. Crazyscan shows a spike at this frequency (11007 V), but it is not as strong as the main channels. Blindscan from Crazyscan just shows a diffuse circle - so is my TBS card on the blink? I've checked online and the site I looked at had nothing about 11007V. Can somebody check as I only have a badly aligned Sky zone1 dish to use for 28E...

Full details I have are 11007 V 22500 DVBS2-16APSK 3/4
 
Nothing wrong with your USB Tuner, am a bit puzzled at the cost of the tuner just to be scanning 28.2e though?
 
Hi remlap - thanks for the quick response. Yes it would be overkill just for 28E (and no way of watching Sky channels on it either!) However the card was watching 13E a couple of weeks back and was looking at the BBC high-symbol-rate backup feed before that. The western sky is easy for me to look at, the eastern sky past 20E is very difficult due to trees. After buying a tuner that couldn't even do DVB-S2 I've now gone the other way and got a tuner that can do a bit more than average.

The problem I have is that the card struggles to lock onto this signal. I am lucky to get one lock per minute. Do you get a 16 dot picture in Crazyscan?

Does anybody know what this signal does / is for?
 
You won't keep lock because its ACM which means it's changing modulation.
 
Full details I have are 11007 V 22500 DVBS2-16APSK 3/4
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That's only partly correct cos with ACM the modulation is constantly changing due to feedback from the earth stations. Just check -> "update modulation info"

Does anybody know what this signal does / is for?
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not really. It's a continuous data stream without transport stream encapsulation. The pci-e card 6926 you can record this stream with the tbs-tsreorder. Later you can examine the recording with any tool or browser. I have now the usb version 5925 which apparently can't record non-ts. But I can remember that the content was partly readable (can't rember 11008V) ;)
 
Hi BlindFaith - thanks for the info. So as there is no MPEG TS there's nothing to see :-(
But as I'm still learning about all things satellite can I ask a few questions? (Especially as this website won't let you search for 3-letter items like "ACM")
If it changes modulation am I right in thinking it goes from 16APSK to 32APSK or QPSK?
I take it the changes are entirely random and not just following a pattern? If somebody had a dual tuner then they could have the 2nd tuner on "stand-by" waiting with the next modulation setting.
Are there any unecrypted ACM feeds out there with a MPEG TS? (ie: something to watch)
 
Are there any unecrypted ACM feeds out there with a MPEG TS?
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possibly

Don't search on this board but look for articles in the www :) e.g. _http://www.advantechwireless.com/wp-content/uploads/DVB-S2-theory.pdf
The exact information can be found the standard EN 302 307 from ETSI.

btw. there's a 2nd ACM transponder on 28.2E at 11186V
 
I had this ACM feed on 8W 12529H a few months ago. Of course you had to catch it when the phase shift was stabilised at 16APSK to resolve the video.

Post #822 http://www.satellites.co.uk/forums/topic/138910-tbs-6925-pci-card-with-hardware-blind-scan-in-dvb-s2-and-dvb-s/page__st__810

Service 1 TC 8W 12529H.webp

service 1 TC.webp
 
Llew said:
I had this ACM feed on 8W 12529H a few months ago. Of course you had to catch it when the phase shift was stabilised at 16APSK to resolve the video.

Post #822 http://www.satellite...s/page__st__810

View attachment 50502

View attachment 50503
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Well, in this case I think that the BBHEADER was wrong and misleading. It had to be transport and not continuous. ACM/VCM is signaled by the same bit. It doesn't mean that the modulation has to change. The modulation checkbox is missing in your screen shot ?
 
Yes, that was the earlier version of Crazyscan without the extra enhancements (PLS etc)
 
BlindFaith - that DVBS2 theory link was really good. Thank you very much! I shall let some of the information sink in and try and read it again later...

But from those powerpoint slides I now know that ACM can work because DVB-S2 transmits the modulation used in the "rugged" header of each frame.
From the manufacturer's website (TBS) I know my card can support ACM/VCM as well as CCM. So in theory shouldn't my card be able to read the header and adapt modulation as required?

I have been using the TBS Blindscan program this afternoon to try and catch what modulations are used. So far I've seen "8PSK 3/4", "16 APSK 4/5", "16 APSK 3/4", "QPSK 1/2" and an odd one "FE_SAT_DUMMY_PLF" (whatever that means!)

I am using the USB variant TBS 5925 instead of the more common TBS 6925 and some of CrazyCat's posts suggest that the USB bridge will not pass all streams. I was hoping that the functionality between PCIe and USB variants would be the same.

I have updated Crazyscan to v1.0.1.57 (website suggested v58 is out, but the download I got still shows v57). I have even installed some "trial" drivers offered on the TBS forum so I am now at v1.0.1.6 dated October 2012. Crazyscan/Blindscan seems inconsistent in greying out the lower half of the Blindscan window. Half the time I cannot tick the "update modulation" tickbox. Despite all of this I cannot record any data from this transponder.

I am aware this topic is becoming more of a TBS 5925/6925 topic than one about 28E - ao I apologise!
 
Yes, you had a screengrab up at the time in the section the link points to. Unfortunately we lost a lot of grabs during the forum changeover; I had to root around in my Recycle bin to find my grabs and post them there today!

I think that Top Secret headline and my pics were in a review of newspapers by the Italian channel Sky TG24 - I have another grab with that logo on it.
 
Yeah I know, just making a mention of it, had a scan today and sadly it's gone. Would of been interesting if update modulation was implemented then.
 
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