[time-nuts] FE 5680A "new version" - Filtering the 10 MHz

Alan Melia alan.melia at btinternet.com
Tue Nov 15 18:06:56 EST 2011


I may be mistaken but that does not look like harmonic distortion to me.....
the frequency "imposed" on the 10MHz sine-wave is around 140MHz, this sounds
like the VCO frequency in the Rb loop. The corner frequency of the filter
could be a long way away from 10MHz in that case ....with maybe minimal
phase shift tempco at 10MHz ?? Butterworth?

Alan G3NYK

----- Original Message ----- 
From: "David VanHorn" <D.VanHorn at elec-solutions.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, November 15, 2011 10:31 PM
Subject: Re: [time-nuts] FE 5680A "new version" - Filtering the 10 MHz


>
>
>  * This is at the RF connector : http://i.imgur.com/Bg3SK.png
>     That's just nasty and indescriptible.
>
>
> Close in impedance discontinuity?
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