[time-nuts] Early WWV Oscillator

Ron Ward n6idlron at comcast.net
Thu Aug 16 06:05:02 EDT 2012


Hi:
Thanks for the information. I an considering what to do.
Ron

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of David
Sent: Tuesday, August 14, 2012 3:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Early WWV Oscillator

Switched bridge or sensor excitation is an old technique used to gain
greater sensitivity for a given power without undue power dissipation
in the sensor itself.  The later can be important to prevent self
heating in a temperature sensor.

I suspect you could get most if not all of the benefit by using a
lock-in amplifier which relies on synchronous demodulation to lower
the noise level.  Linear Technology application note 43 page 24 shows
a good example.  There are also several switched bridge examples in
the same application note.

http://cds.linear.com/docs/Application%20Note/an43f.pdf

On Tue, 14 Aug 2012 13:42:49 -0700, "Ron Ward" <n6idlron at comcast.net>
wrote:

>HI Robert:
>WOW! Thanks.
>I need to build a double oven for my thunderbolt and set it to about 50
>Degrees C.
>
>I am really just trying to reduce the 24 hour temperature range.
>
>I am looking at an application note from National Semiconductor, AN 266,
>for a precision oven. It claims .001 degree C!
>
>The internal oven for the Trimble Oscillator is most likely not as good
>as the one featured in the application note.
>
>Any ideas?
>
>Thanks again,
>Ron
>
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>Behalf Of Robert Atkinson
>Sent: Tuesday, August 14, 2012 1:21 PM
>To: Time Nuts
>Subject: [time-nuts] Early WWV Oscillator
>
>Came across this when browsing 
>
>\http://nistdigitalarchives.contentdm.oclc.org/cdm/singleitem/collection
>/p16009coll3/id/34
>
>Robert G8RPI.

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