[time-nuts] Re: DIY Low offset Phase Noise Analyzer (Erik, Kaashoek)

[Bob kb8tq]

Hi

There are a very small number of signal generators that *might* 
help when measuring phase noise on a good source. The “rest 
of them” are very much in the “don’t bother” category. Just which
one is in the “maybe” category depends a lot on your frequency
of interest. None of them seem to be very affordable …. wonder
why :) :) :)

Do useful ones pop up from time to time? Sure they do. They might
require a bit of work to get going. Thanks very much to those who
make them available. 

Bob

> On Jul 11, 2022, at 6:41 PM, Alex Pummer via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> yes there are much better signal generators out there, that frequency doubler tuning circuit is for religious people only -- you need to be able to believe, that it could work
> 73
> KJ6UHN
> Alex
> 
> On 7/11/2022 12:24 PM, Dave B via time-nuts wrote:
>> On 11/07/2022 08:30, time-nuts-request at lists.febo.com wrote:
>>> I also measured a Marconi 2022 signal generator and it was possible to
>>> lock but the phase noise was terrible with strong factional PLL spurs.
>> 
>> Indeed, those signal generators are renown for having "some rather interesting" spectral content...
>> Around, above and often well below the "desired" signal!
>> 
>> Not entirely surprising though, if you look at the block diagram of one such.
>> 
>> Regards to All.
>> 
>> Dave G0WBX(G8KBV)
>> 
>> 
>> 
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