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[Discuss-gnuradio] DTV reception with the FLEX400 board

From: Brent M. Ledvina
Subject: [Discuss-gnuradio] DTV reception with the FLEX400 board
Date: Tue, 21 Aug 2007 17:58:50 -0400


I have used the gr-atsc receiver and the TVRX to prove to track and decode DTV/HDTV signals. I am trying to do the same thing with the RFX400 board, although I am running into trouble. There is an available signal at 491 MHz, which works fine when I record data with the TVRX, but the RFX400 does not seem to produce data that the gr-atsc receiver can decode properly. Note that I've looked at the DTV spectrum using the RFX400, and it looks reasonable. Are there any considerations I've overlooking in terms of hardware differences between the RFX400 and the TVRX? I don't believe I have to change anything in the gr-atsc receiver, assuming I'm using the same decimation rate (10), properly setting the gain (which needs to be set to a lower value on the RFX400), and properly centering the signal. Is this assumption incorrect? Are there software modifications that are required for the gr-atsc receiver?


Brent M. Ledvina
Assistant Professor 
Bradley Department of Electrical and Computer Engineering
Virginia Tech
Blacksburg, VA 24061
ph: 540.231.0656
Office Hours: T 1-3, W 11-12 

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