[time-nuts] 5 Mhz to 10 Mhz and 25 Mhz
Dave B
g8kbvdave at googlemail.com
Wed Sep 11 16:56:22 UTC 2019
Hi Paul.
PLL's of course can introduce phase-noise, as well as remove it.
Certainly if the reference 5 MHz is (phase)noisy then a PLL can clean
that up, but if you multiply it (before cleaning) it gets much worse.
The multipliers themselves as someone else may chime in, can add to that
I suspect too.
I missed your original question, so did not realise you wanted to
multiply up that far.
Do you subscribe to Dubus? There's a description of a 122 GHz system in
the current issue, using (from what I can gather) IC's used for
collision avoidance/adaptive-cruise control etc, in modern vehicles..
PL locked (sort-of) to a GPS PPS source too, phase noisy at 122 GHz, but
good enough for FM voice it seems!
http://www.marsport.org.uk/dubus/last.htm (Just the front cover.)
There is a sample full issue at
https://www.dropbox.com/s/6gusksmazh7wmyy/DUBUS412w.pdf?dl=0 (that
describes a 134 GHz transverter) If you've not come across that
publication before.
73 Paul.
Dave G0WBX
------------------------------------------------------------------------
> Subject: Re: [time-nuts] 5 Mhz to 10 Mhz and 25 Mhz
> Message-ID: <B66D51BC70084A0E8B4F9F5BCDB4C373 at precision380>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Dave I posted the question as I am not up to speed with the latest
> solutions
> But I want the lowest phase noise that is easily possible so you might be
> correct as it is to lock up a 10 Ghz receiver but later for a 120 Ghz
> receiver
>
> Regards Paul
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