Some of the HP OCXOs (the one in the HP856x SA) have a "oven ready" signal.
That could be used to force the switch. Some Rubidium standards (FEI
FE-5680A for sure) have a locked indicator that could do this function.
I think you could mute the 10 MHz where it is fed to the instrument and that
should default to the internal source.
Tom
----- Original Message -----
From: "Joseph Gray" <jg...@zianet.com>
To: <li...@lazygranch.com>; "Discussion of precise time and frequency
measurement" <time-nuts@febo.com>
Sent: Sunday, December 09, 2012 5:21 PM
Subject: Re: [time-nuts] Switching oscillators
My first thought is to simply wait a fixed time until the OCXO has
warmed up and then switch over. I thought that others here might
suggest a better method.
Joe Gray
W5JG
On Sun, Dec 9, 2012 at 3:04 PM, <li...@lazygranch.com> wrote:
You would probably want to see when the external oscillator frequency is
close to the internal oscillator. I suppose than could be done with a
mixer and glue circuitry. I don't think this is cheap though.
-----Original Message-----
From: Joseph Gray <jg...@zianet.com>
Sender: time-nuts-boun...@febo.com
Date: Sun, 9 Dec 2012 14:12:51
To: Discussion of precise time and frequency
measurement<time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: [time-nuts] Switching oscillators
I have a device that has an internal TCXO. I want to feed it with an
external OCXO, but I don't want to completely replace the TCXO.
Here is the scenario. On initial power on, or after a power loss, I
want the internal TCXO to be used. Once the OCXO is up, I want to
switch to it. How could this be done easily and cheaply?
Joe Gray
W5JG
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