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rayman1366

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Reply with quote  #1 
hello

what is best 16/32 APSK ACM/VCM DVB?

in tbs cards 6983 is the best?

thanks

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TT-budget S2-1600.
Prof 7500 S2.
andyinyakima

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Reply with quote  #2 
I own a couple of TBS5925s and one TBS6983; the 6983 is more sensitive and faster to Lock then the 5925. In the field I use the 5925 because it is USB portable and works with my Laptop and Raspberry Pi2.

I use Linux with open source drivers of which the 6983 drivers are in the initial stages of development.
UDL has done a great job to date.

ACM/VCM is in my learning curve, the 5925 and 6983 I believe can handle ACM/VCM to some extent.

One of the biggest problems with 16/32APSK is collection of signal..... I just need to get a bigger dish[smile]


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andyinyakima
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Recs: TBS6983, TBS5925 __ Ant: 90cm on SG6100__OSes: Linux with v4l-updatelee drivers __ RPi2 with v4l-updatelee drivers

Open Book, Open Source, You have to Open it to Know what's in it!
wejones

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Reply with quote  #3 
I have a 6925 and 6983.
As mentioned above, the 6983 "seems" to be more sensitive than the 6925, however I think this is kind of misleading.  Both give me almost identical SNR on all signals.  I think that the gain may be set higher on the 6983, but that seldom results in any advantage re locking signals.
  There are occasions when one will lock a transponder and the other one won't, but this is rare, and usually if I change the freq a bit, I can get both to lock the signals. 
  As far as most normal 16/32 APSK and ACM/VCM, I think the two are pretty much identical.
  For some ACM/VCM, and for multi-stream transponders, the 6983 gives you more control over selecting only the modulation and stream that you are interested in.
  I prefer the 6925 for most viewing, but switch to the 6983 for investigating interesting more complicated transponders. 
  I also agree with the above that most 16/32 APSK transponders tend to be difficult because they require a better signal.  Most of them I can't lock, particularly ACM/VCM with 32APSK modes.  This is where the 6983 seems better as sometimes I can specify one of the less complex modes, and ignore the 32APSK contributions.







Unit54

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Reply with quote  #4 
   wejones, are you able to decode more ACM/VCM signals with the more capable TBS 6983, compared to the TBS 6925 ?   If so, what software are you using ?
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Windows 7 quadcore with TBS6925 PCI-e DVB-S2 tuner card.   Use mostly DVB Dream, Crazy Scan/VLC player and Smart DVB.   90 cm Ku dish.  Also Pansat 9500 HDX receiver
Stefan2k15

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Posts: 37
Reply with quote  #5 
Do you need ACM/VCM? Most of the ACM/VCM stuff is data feeds. If all you need is CCM the DVBsky S960 is pretty good and does 16 and 32apsk. Note your going to need a good dish for most of these type feeds.
updatelee

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Reply with quote  #6 
My 6983 is definitely a faster tuner / demod. It locks faster and scans faster. I haven't had time to give it a full test as I'm still working on the driver's so it wouldn't be fair. I did play with the gain and honestly didn't help me but I've got a 1.8m dish and can lock 32aspk no problem. In the summer I'll setup a 1m dish and see if I can tweak the gain settings and see if it helps. I'll also remove it from the powered multi switch because that has an inline amp as well. So I can get a better situation to what most users have.

UDL

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TBS6925/5980, Prof 7301/7500/8000, Genpix Skywalker-1, Skystar 2 Express HD
Hauppauge 950Q/Aero/Aero-m, Kworld 330U/435v3/445v3

I use Linux and support open source projects
Download my opensrc projects at http://updatelee.blogspot.com
Derrick

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Posts: 192
Reply with quote  #7 
Quote:
Originally Posted by Unit54
   wejones, are you able to decode more ACM/VCM signals with the more capable TBS 6983, compared to the TBS 6925 ?   If so, what software are you using ?

It's more a question of the stream type. TS is ok but continuous..
wejones

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Reply with quote  #8 
Quote:
Originally Posted by Unit54
   wejones, are you able to decode more ACM/VCM signals with the more capable TBS 6983, compared to the TBS 6925 ?   If so, what software are you using ?

My dish isn't big enough or good enough to get good locks on very many APSK signals, and as mentioned above, most of the ACM/VCM signals are data, and most of those are generic stream so we can't do anything with them anyway.
But no, I haven't noticed anything that the 6983 would lock that the 6925 wouldn't lock.  However, as I mentioned, I have noticed a few transponders that I got partial locks, ie it locked, but with continuity errors, and in some of those cases, witht the help of Crazyscan, I could specify a specific mode , and/or multistream with the 6983, allowing me to get error free reception on one of the modes/streams.
   I think the NOAAPORT transponder was one that this helped, but I'm not sure.  OH, and I think back when a few of those narrow race track channels were in APSK mode, the 6983 was better with them because it allowed you to specify frequency values to precision less than a MHz. 


Unit54

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Reply with quote  #9 
   wejones, thanks for the good info comparing the TBS 6983 to the TBS 6925.
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Windows 7 quadcore with TBS6925 PCI-e DVB-S2 tuner card.   Use mostly DVB Dream, Crazy Scan/VLC player and Smart DVB.   90 cm Ku dish.  Also Pansat 9500 HDX receiver
mansourselmy

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Posts: 50
Reply with quote  #10 
i use tbs 6908...untill now,i see them carry data channels..
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TBS 6908
Mounir

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Reply with quote  #11 
it is not only a Question of DVB card but  a question of Software that you are using with .  I had in the past  a videomate S300 that works perfectly with dvbdream although this card is not expensive but it did what the most cards did with dvbdream . Today i use Skystar 2 express HD running VDR so gut with (70 Cm Dish  in Morocco ) and all Transponders are inside .. no Problems . 

The Old Chinese Master said / a good hardware with a good software . Good Women need Good men ; That's it . [biggrin]

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Derrick

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Posts: 192
Reply with quote  #12 
Quote:
Today i use Skystar 2 express HD running VDR so gut with (70 Cm Dish  in Morocco ) and all Transponders are inside .. no Problems .

Good for you but this thread is about 16/32 APSK [wink]
updatelee

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Reply with quote  #13 
That card can tune and demodulate 16 and 32 apsk. It can even do ACM but with some conditions, only with long frames not short.

UDL

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TBS6925/5980, Prof 7301/7500/8000, Genpix Skywalker-1, Skystar 2 Express HD
Hauppauge 950Q/Aero/Aero-m, Kworld 330U/435v3/445v3

I use Linux and support open source projects
Download my opensrc projects at http://updatelee.blogspot.com
Tholex

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Posts: 58
Reply with quote  #14 
Now they only need to improve translation?

DD Cine S2 V7A:

Suitable for high resolution transponder thanks to the latest demodulator technology (STV0910A - Impoved Version compared to STV0910B ) 
How all Digital Devices products, also the Cine S2 V7A supports Singlecable Reception - UniCable to EN50494 and UniCable II / Jess to EN50607. 
DRCars

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Reply with quote  #15 
Quote:
Originally Posted by wejones
I have a 6925 and 6983.
As mentioned above, the 6983 "seems" to be more sensitive than the 6925, however I think this is kind of misleading.... snip ....
I'm a little confused here. Do you mean 5925 (USB) like andyinyakima was writing about? I don't think he was comparing 6925 to 6983, he appears to be comparing the 5925 to the 6983.
Quote:
Originally Posted by andyinyakima
I own a couple of TBS5925s and one TBS6983; the 6983 is more sensitive and faster to Lock then the 5925. In the field I use the 5925 because it is USB portable and works with my Laptop and Raspberry Pi2.


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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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