[time-nuts] Yet another GPSDO project.

[Tobias Pluess]

Sure. However my OCXO has around -155 dBc/Hz, almost 20dB worse than your -170.
One channel of my distributor can be seen here

https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/ad9631-10MHz-driver.png

they have 200 Ohms input impedance and 4 of them are in parallel, so in total the input impedance to the distributor is 50 Ohms again for the OCXO.

Tobias
HB9FSX

________________________________________
From: time-nuts [time-nuts-bounces at lists.febo.com] on behalf of Bob kb8tq [kb8tq at n1k.org]
Sent: Thursday, March 28, 2019 02:01
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Yet another GPSDO project.

Hi

How much impact your distribution setup has on the OCXO phase noise depends a *lot* on how quiet the
OCXO is. If it is in the -170 dbc/ Hz range, then pretty much anything can mess up the phase noise ….

Bob

> On Mar 27, 2019, at 5:05 PM, Tobias Pluess <tobias.pluess at xwmail.ch> wrote:
>
> Hi Leo,
>
> sorry for my late reply.
> I have not yet measured the phase noise of my finished unit, since I am still waiting to complete my phase noise measurement equipment.
> However, I have a decent test report for my OCXO, where the phase noise spectrum is also plotted. I don't expect my distributor circuit which I connected to the OCXO to degrade the phase noise too much since it is just a bunch of OpAmps and resistors.
> I have a HP 8663A here for comparison, but I still lack a proper phase noise test set.
>
> Tobias
>
>
> ________________________________________
> From: time-nuts [time-nuts-bounces at lists.febo.com] on behalf of Leo Bodnar [leo at leobodnar.com]
> Sent: Thursday, March 21, 2019 09:14
> To: time-nuts at lists.febo.com
> Subject: Re: [time-nuts] Yet another GPSDO project.
>
> Tobias,
> Have you measured resulting phase noise of the finished unit?
> Thanks
> Leo
>
>> From: Tobias Pluess <tobias.pluess at xwmail.ch>
>> sure, I believe you since my primary requirement was phase noise. This is because I'd like to use the OCXO as reference for my spectrum analyzer and also for my HP 8663 signal generator to do phase noise measurements
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