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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:
>
>http://lists.gnu.org/archive/html/discuss-gnuradio/2005-03/msg00030.html
>
>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.
John