List,
Wrote: Your simple idea is a non-workable concept.
Now how do you actually know that? It’s an opinion that would have to be
proved or disproved by actually doing it. I based my opinion on the graph that
showed the HP crystal frequency change verses temperature which was IIRC, quite
s
Perry,
The bad part of your "solution", that you seem to be missing is the
BFO will not be locked or referenced to any standard but itself. If
that is acceptable to you, then there is no need to reference your 3586
to anything but itself rendering the entire subject void to you.
The DDS sol
On Sat, Apr 02, 2011 at 04:13:55PM -0400, Chuck Harris wrote:
> Unlike simply stabilizing the BFO crystal as you propose.
Has anyone given any thought to an alternative - phase locking
the original BFO Xtals with a very narrow bandwidth loop to something
derived from the 10 Mhz standard i
On Mon, Apr 04, 2011 at 02:00:14AM -0400, David I. Emery wrote:
> On Sat, Apr 02, 2011 at 04:13:55PM -0400, Chuck Harris wrote:
>
> > Unlike simply stabilizing the BFO crystal as you propose.
>
> Has anyone given any thought to an alternative - phase locking
> the original BFO Xtals with a
Basically, the higher the division ratio in a PLL synthesizer,
which is what you are describing, the greater the phase noise.
You can think of it this way: Both the reference, and the oscillator
being controlled, need to be divided down to some common frequency
that you feed to the phase detector
---
From: Chuck Harris
Sender: time-nuts-boun...@febo.com
Date: Mon, 04 Apr 2011 07:19:38
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 3586 entirely referenced to 10MHz: A solution II
Hi Didier,
If you want to convert the Xtal to a VCO, you will have to adjust the parallel
capacitance so that the crystal can get above the desired frequency, and then
design the varactor circuit so that it can pull from there to below the desired
frequency...which should be possible if the cryst
Hello Didier;
I don't have a copy of the schematic however I was
wondering if there are trim caps installed for these
crystals?? If so, then a varactor can tune above and
below in place of the mechanical cap if you remove it.
Undoubtedly there is some loading cap in the circuit
that could be twea
On Mon, Apr 04, 2011 at 07:19:38AM -0400, Chuck Harris wrote:
> Basically, the higher the division ratio in a PLL synthesizer,
> which is what you are describing, the greater the phase noise.
No question about that, indeed.
But I am talking about a very low bandwidth loop (presuma
I am thinking the answer is not the interesting thread.
Its yes, that approach was considered.
I can't speak for Bert but the issue has been understood for a long time
actually. At least 10 years since my first purchase.
When I consider a problem I tend to look at the trade offs trade offs. The
ab
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