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Re: [Discuss-gnuradio] external clock

From: John Ackermann N8UR
Subject: Re: [Discuss-gnuradio] external clock
Date: Fri, 19 Aug 2005 08:52:48 -0400
User-agent: Debian Thunderbird 1.0.6 (X11/20050802)

Bdale Garbee wrote:

>Looking at options for locking all the clocks that are part of the EME
>station I'm building to my HP 58503A GPS-synced clock.  Searching the
>list archives, I found this note from Matt regarding the external clock
>input on the USRP:
>Has anyone played with this?  
>Of particular interest is whether anyone has hacked the FPGA code to use
>the internal PLLs to retain a 64 Mhz sample clock using a 10 Mhz
>reference clock input to the board.

Hi Bdale --

Interesting idea about the FPGA hack.  If that doesn't work, TAPR is
just now releasing a product called the Reflock II that allows you to
lock just about any oscillator to a standard frequency, or to a 1pps
signal.  I'm going to use one to generate 64MHz locked to my house
standard -- haven't yet figured out just what the best choice of VCXO
will be, though.

We'll be showing the Reflock II off at the DCC (Santa Ana, CA --
September 23-25) and we'll have 'em for sale shortly thereafter.


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