[time-nuts] filtering a 10Mhz frequency standard?

Bob Bownes bownes at gmail.com
Mon Dec 12 22:11:14 EST 2011


Paul Wade did a paper on 10Mhz GPSDO filtering for Microwave Update in
October. It is in the proceedings. I don't know if it is available
elsewhere.

Bob


On Mon, Dec 12, 2011 at 9:17 PM,  <lists at lazygranch.com> wrote:
> I think you would want to avoid crystal filters due to microphonics.
>
> I've found building good LCR filters harder in real life than on paper. (I've done plenty of leapfrog active filters from LCR based designs.) I've had to make a passive LCR for ADC testing and secondary (parasitic elements of nonideal component) come into play.  Nowadays I just buy COTS.
>
>
> ------Original Message------
> From: Chris Albertson
> Sender: time-nuts-bounces at febo.com
> To: Discussion of precise time and frequency measurement
> ReplyTo: Discussion of precise time and frequency measurement
> Subject: [time-nuts] filtering a 10Mhz frequency standard?
> Sent: Dec 12, 2011 5:54 PM
>
> What is the best practice for filtering a 10Mhz sine wave frequency
> standard?   I've read that you can do more harm than good. Filter
> parts  (caps, resistors and so on) are all temperature sensitive. But
> all those $40 Rb oscillators are putting out a pretty rough looking
> sine wave.
>
> Are some types of filters better.  I thought about a crystal filters.
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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