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Re: [Discuss-gnuradio] Suggestions regarding a frequency reference
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] Suggestions regarding a frequency reference |
Date: |
Tue, 14 Jun 2005 16:11:45 -0700 |
User-agent: |
Mozilla Thunderbird 1.0 (X11/20041206) |
David P. Reed wrote:
> In interfacing a new 5 GHz up/downconverter to the USRP (my summer
> project), I find that I need a 40 MHz frequency reference to drive a PLL
> in the chip. My first prototype will interface using the Basic Rx/Tx
> daughterboards, and it occurs to me that I can probably use one of the
> DAC clocks for that.
>
> Should this work? Any other suggestions (at this stage I'd prefer to use
> an existing, programmable source on the USRP, rather than another chip
> and crystal)?
Does it need to be 40 MHz? 40 is going to be hard to produce cleanly on
the board. 128 divided by any integer is much easier.
Matt