[time-nuts] Re: 1 pps

[Andy Talbot]

You seem to have gone to extraordinary lengths to trap out each unwanted
product, yet  the final spectrum shows only -50dBc products.   That seems a
poor return for that effort in filter design.

I made a 5MHz doubler plus distribution for my HP5061. You can see the
design at http://g4jnt.com/10MHzDist.pdf  The doubler is a full wave
rectifier and the filter a three section top capacitor coupled LC
resonator.    I achieved better than -80dBc rejection of the 5MHz
fundamental and something like  -75dB at 15MHz but this far down,
measurement is quite a challenge.

For most practical purposes these levels are more than adequate, but I do
sometimes directly multiply up to 10GHz or higher, using this 10MHz source
as the reference input to a PLL synthesizer.   I think I've seen evidence
that even -80dBc at 5MHz can introduce spurii at this level of
multiplication, so really ought to be aiming at -100dBc - but that woul dbe
impossible to measure with any test equipment I have.   Even seeing -80dBc
was a challenge.

Andy
www.g4jnt.com



On Thu, 11 Nov 2021 at 00:53, Gerhard Hoffmann <ghf at hoffmann-hochfrequenz.de>
wrote:

>
>
> Am 10.11.21 um 23:56 schrieb B Riches via time-nuts:
> > Any ideas on how to get a useable 1 pps output sig out of a Lucent
> KS-24361 to use with SL sampling rate detector.
> > I am using the 1 pps output from a Jackson unit but would like to use
> the Lucent if I can since that is my gps standard.
> > 73
> > Bill, WA2DVUCape May, NJ
>
> There are some pics with red arrows herein:
>
> <   http://www.hoffmann-hochfrequenz.de/downloads/DoubDist.pdf  >
>
> The board I made was home-etched, so there are no left-overs,
> but you or whoever can get the Altium or Gerber files.
> Should be less than 20 bucks for 10 boards from JLCPCB,
> including postage.
>
> Cheers, Gerhard
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com -- To unsubscribe send
> an email to time-nuts-leave at lists.febo.com
> To unsubscribe, go to and follow the instructions there.
>