ASI output

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PE5PVB
Posts: 22
Joined: Sun Sep 02, 2012 6:51 pm

ASI output

Post by PE5PVB » Sun Sep 02, 2012 6:52 pm

Hi,

Is it possible to get an ASI output of the transport stream with the Digilite device? I do have a perfect QPSK modulator from Philips, which only needs an ASI input signal. It works perfectly with an external MPEG2 encoder with build in multiplexer. But these encoders are very expensive.

G4EWJ
Posts: 748
Joined: Wed Feb 17, 2010 10:11 am

Re: ASI output

Post by G4EWJ » Mon Sep 03, 2012 10:40 am

How does the Philips modulator connect? Ethernet, USB?

I don't know much about ASI, but it seems to have a very high data rate and it seems to need the raw 188 packets before any DVB processing is done. DigiLite can't output raw 188 byte packets at the moment.

DigiLite FEC on Serialiser effectively outputs 204 byte packets, but that has all the processing, except the FEC, already done. It can send that to anything that appears like a COM port.

Brian

PE5PVB
Posts: 22
Joined: Sun Sep 02, 2012 6:51 pm

Re: ASI output

Post by PE5PVB » Mon Sep 03, 2012 7:49 pm

Brian,

ASI is a standard for digital signals, like transport streams. The generation of DVB-S, including the needed symbolrate and FEC is already done by the Philips modulator. I keep looking for a solution. It's working fine now, but the encoder is a bit expensive to buy.

My current setup: Philips DVB-S modulator, testpoint L-band output on 23cm's. This is about 0dBm.
Then a 3dB att, ADA4743, ADA4643, MGA31189, BFQ34, BFQ68, 2xM57702. Runs DVB-S on about 20 Watts.

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