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Re: [Discuss-gnuradio] Failed to set TX frequency!!

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Failed to set TX frequency!!
Date: Wed, 04 Jul 2007 12:29:39 -0700
User-agent: Thunderbird (X11/20070326)

Eng. Firas wrote:
> Hi Johnathan,
> Sorry for not being clear. I was making a new usrp_source.py & usrp_sink.py
> files (attached below) to be posted to gunradio. Testing the new
> usrp_source.py code was ok for all frequencies and daughter boards. However,
> testing usrp_sink.py code, with TX frequencies between 44MHz and 83 MHz gave
> me the tuning function failing indication which I use it to print the
> message "Failed to set TX frequency". This is strangely happening to the
> Basic TX daughter board only in this frequency range.

The digital upconverters in the AD9862 don't allow you to set the
frequency to values close to the nyquist frequencies.  Since it samples
at 128 MHz, the prohibited ranges are around multiples of 64 MHz.


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