[time-nuts] Switching oscillators

[shalimr9 at gmail.com]

If they don't get close, which is right?

If you only have 2 references, you cannot tell which is right.

Didier KO4BB

Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: lists at lazygranch.com
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sun, 09 Dec 2012 4:04 PM
Subject: Re: [time-nuts] Switching oscillators

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 <jgray at zianet.com>
Sender: time-nuts-bounces at febo.com
Date: Sun, 9 Dec 2012 14:12:51 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at 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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