|Subject:||Re: [Discuss-gnuradio] changing the vctcxo|
|Date:||Thu, 08 Mar 2007 18:10:21 -0800|
|User-agent:||Thunderbird 126.96.36.199 (X11/20070302)|
Roshan Baliga wrote:
Hans Glitsch wrote:I just found this one on Digikey: http://www.abracon.com/Oscillators/ASVTX11.pdfI'm not an experienced hardware guy, but it looks like it would work in the usrp. Please tell me if I'm wrong.I believe the USRP needs a 3 Vpp clock in, and this TCXO only outputs 0.8 Vpp. Plus, it's a clipped sine. So you may want to throw it through a squarer that will bump it up to 0 -> 3V before putting it into J2001. Is this right Matt?
The rev 4 and newer USRPs have a clock generator chip that is spec'ed to take a signal as low as 150 mV p-p. However in my testing I found I needed a voltage as high as 8 or 9dBm. 8dBm is about .8V, so that should still work.
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