I had similar problems.

The AD9513 has 2 clock inputs, and I think I killed one :/

Now I can only use the original / internal clock input.

I use dipswitches, to switch between original and external oscillator...works too.

Did you check with 2 inputs?

> Date: Wed, 22 Sep 2010 09:51:23 +0200
> From: paolinunzia@libero.it
> To: openbts-discuss@lists.sourceforge.net
> Subject: Re: [Openbts-discuss] USRP 52 MHz clock
>
> Hi,
>
> >And what output voltage swing did you configure ?
> >AC/DC coupling ?
>
> I'm using a signal generator. the parameters that I set are:
> 1) frequency 52MHz
> 2)Amplitude: low level =0 V high level=1.5V
>
>
>
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