Low symbol rate receivers

The place to discuss reduced bandwidth fast scan amateur television on 70cms and below
F6DZP
Posts: 203
Joined: Fri May 27, 2011 9:59 am

Re: Low symbol rate receivers

Post by F6DZP » Wed Mar 18, 2015 5:02 am

I have tested again the 2 USB cards I was talking.

I have used their standard BDA driver and TransEdit and tried to find the lowest SR they can work:

==> TBS 5980 can lock down to 480 kS/s
==> Prof 7500 can lock down to 1000 kS/s

These cards have both STB6100+STV0903 that can work down to 105kS/s using Tutioune1600 version0.6 and the TT S2-1600 card (and not the BDA driver).

TransEdit (or DVBviewer) just ask the BDA driver to do the job. So it is the BDA driver (and firmware) that are not very well set for low SR.
I have not tried these cards under linux, but as I have seen, linux driver for these chips is not also optimized.

I continue to work on these cards to see if we can fix this setup to be able to use lower SR.

Jean Pierre F6DZP
Last edited by F6DZP on Thu Mar 19, 2015 6:03 am, edited 1 time in total.

G4GUO
Posts: 626
Joined: Tue Feb 16, 2010 12:51 pm

Re: Low symbol rate receivers

Post by G4GUO » Wed Mar 18, 2015 7:52 am

I can't speak for these cards but the TT connect S2-3600 (now obsolete) requires the Linux module
to be recompiled as the minimum symbol rate is hard coded into one of the files, this means that out of
the box it won't operate below 5 MS/s. As it uses a similar chipset to the ones Jean Pierre mentioned
the same will probably apply.

- Charles

G8DKC
Posts: 249
Joined: Thu Jun 28, 2012 9:39 am

Re: Low symbol rate receivers

Post by G8DKC » Fri Mar 20, 2015 2:59 pm

I see you can buy the TBS 5980 for under £72.00 from a French Ebay seller, also same sort of price from far east,
can't find the DVB-S2 7500 USB, lots of ads and talk, no sales, some of the talk goes back a few years?
As we are paying over £200.00 for a Tx it's not bad, esp if Jean Pierre gets Tutioune working with it.

Just a "quick" laptop for portable.

73

Peter

ON1AVO
Posts: 21
Joined: Sun Nov 20, 2011 2:35 pm

Re: Low symbol rate receivers

Post by ON1AVO » Fri Mar 20, 2015 8:28 pm

Look at http://www.satmultimedia.tv/prof-revolu ... 2-usb-7500 selling for 99 euros.

Freddy

G8DKC
Posts: 249
Joined: Thu Jun 28, 2012 9:39 am

Re: Low symbol rate receivers

Post by G8DKC » Sat Mar 21, 2015 5:34 am

Hi Freddy,

Thanks for the link, hard to find that one!

Gets a good review with the Satellite users,
might have a "look" at that and the TBS 5980 ;)

Peter

G8DKC
Posts: 249
Joined: Thu Jun 28, 2012 9:39 am

Re: Low symbol rate receivers Prof DVB-S2 USB 7500

Post by G8DKC » Sat Mar 21, 2015 9:14 am

Looks like the Prof Revolution USB 7500 is going to be hard to find, the only supplier found so far,

Satmultimedia emailed saying, "The item is no longer in stock and we do not have a delivery date!".

Looks like the TBS 5980 is the only one available at the moment ?

The 7500 in various versions has been around for some time.

73

Peter

F6DZP
Posts: 203
Joined: Fri May 27, 2011 9:59 am

Re: Low symbol rate receivers

Post by F6DZP » Tue Mar 31, 2015 2:29 pm

Hello,

I have a new solution: look athttp://www.batc.org.uk/forum/viewtopic.php?f=15&t=4102


73
Jean Pierre F6DZP
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