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

[Timeok]

see also:     

www.timeok.it/files/10_mhz_bandpass_filter.pdf


Luciano

Luciano P. S. Paramithiotti
IZ5JHJ


--------- Original Message --------
From: n1jez at burlingtontelecom.net
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] filtering a 10Mhz frequency standard?
Date: Dec 13, 2011 12:12 PM

> 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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