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Re: [Discuss-gnuradio] changing the vctcxo

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] changing the vctcxo
Date: Thu, 08 Mar 2007 18:10:21 -0800
User-agent: Thunderbird (X11/20070302)

Roshan Baliga wrote:
Hans Glitsch wrote:
I just found this one on Digikey: http://www.abracon.com/Oscillators/ASVTX11.pdf

I'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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