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Re: [Discuss-gnuradio] Mux settings...
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Mux settings... |
Date: |
Tue, 23 Oct 2007 09:30:25 -0700 |
User-agent: |
Mutt/1.5.9i |
On Tue, Oct 23, 2007 at 08:42:59AM -0700, Hans Glitsch wrote:
> >
> >For the Basic Rx, 0xf3f2f1f0 is the correct setting to feed 4 separate
> >signals into the I inputs of 4 DDCs, with zeros fed to the Q inputs.
> >
> >To use 4 channels, you must use the std_4rx_0tx.rbf fpga image.
> >If you use the std_4rx_0tx.rbf image, the decimation rate must be <= 128.
> >If you need more decimation, you must do it in software.
> >
> >Eric
> >
>
> I wasn't aware that I couldn't use a decimation of 250. 250 seemed to work
> fine with release 3.0.
This is the problem that was reported last week. Without the halfband
in the FPGA, the CIC sections aren't wide enough to support decimation
> 128 without losing information.
> Are odd numbers ok? Can I use a decimation of 125?
With the std_4rx_0tx.rbf image, I believe odd numbers will work.
They will not work with std_2rxhb_2tx.rbf
> Thanks,
> Hans
Eric