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Re: [Discuss-gnuradio] external clock
From: |
Bdale Garbee |
Subject: |
Re: [Discuss-gnuradio] external clock |
Date: |
Fri, 19 Aug 2005 11:16:37 -0600 |
On Fri, 2005-08-19 at 08:52 -0400, John Ackermann N8UR wrote:
> Reflock II that allows you to
> lock just about any oscillator to a standard frequency, or to a 1pps
> signal.
I'm aware of the Reflock designs, and in fact have some of VE1ALQ's
boards in hand (bare boards only).
> 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.
Aye, that's the rub. Bob's point about phase noise in the on-chip PLL
being a potential source of problem is a good one. Without digging in
to that, it suggests to me that this might be a better approach and thus
a suitable choice of VCXO is the problem we really need to address.
Meanwhile, I poked Matt for an updated delivery estimate on the USRP L
and S band daughter cards the other day but haven't heard back from him
yet. Does anyone else (Eric?) know enough about the design of those to
share the up/down conversion approach? Is there another oscillator to
tame, a PLL driven by a USRP reference clock, or what?
There's only two months until the first half of the ARRL EME contest,
which I'd love to be on the air for on 1296...
Bdale