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

n1jez at burlingtontelecom.net n1jez at burlingtontelecom.net
Tue Dec 13 06:08:40 EST 2011


Paul's simple filter:

http://www.w1ghz.org/small_proj/small_proj.htm

Mike

----- Original Message ----- 
From: "Bob Bownes" <bownes at gmail.com>
To: <lists at lazygranch.com>; "Discussion of precise time and frequency 
measurement" <time-nuts at febo.com>
Sent: Monday, December 12, 2011 10:11 PM
Subject: Re: [time-nuts] filtering a 10Mhz frequency standard?


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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