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Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver)
From: |
Douglas Geiger |
Subject: |
Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver) |
Date: |
Thu, 19 Feb 2009 16:20:01 -0600 |
User-agent: |
Thunderbird 2.0.0.19 (Windows/20081209) |
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Matt Ettus wrote:
> Douglas Geiger wrote:
>>
>> Is the test clock supposed to be running at 5kHz? I've just tested this
>> on one of my USRP2 - it does appear to be locked with my external clock
>> - - i.e. the 5kHz signal on the pin doesn't drift w.r.t my 10Mhz external
>
>
> No, the test clock runs as 100MHz/div where div is the 2nd argument to
> the function. The maximum value of div is 32.
>
> I think you are using a digital oscilloscope to view this, and you are
> seeing it alias because you turned the time per division up way too
> high. Change it to 100ns per division.
>
> Matt
Ah - that's was the problem. Unfortunately my scope can only handle a
single channel at 100MHz, so setting the divisor >2 helps.
Unfortunately it appears the clock is not synchronized with my external
10MHz clock - any suggestions on further steps to debug why I'm having
trouble?
Thanks,
Doug
- --
Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University
http://cspl.okstate.edu
address@hidden
address@hidden
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- Re: [Discuss-gnuradio] Re: USRP2 and external clock (from GPS receiver), (continued)
- Re: [Discuss-gnuradio] Re: USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/19
- Re: [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), Johnathan Corgan, 2009/02/19
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/19
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/20
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/20
- Re: [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Eric Blossom, 2009/02/20
Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver),
Douglas Geiger <=
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Eric Blossom, 2009/02/20