[time-nuts] HP3325B as LO for a transceiver or receiver? Phase noise?

[Jeff Blaine]

Another option is to use an OCXO.  You have to go pretty nuts to get a 
modern frequency agile gadget to beat the spectral purity of a decent 
oscillator.  And here pretty nuts is probably an understatement.  If you 
only need frequency stability, the OCXO is a solid option assuming you 
can get one with the proper freq.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 01-Jan-19 6:05 PM, Mark Goldberg wrote:
> On Tue, Jan 1, 2019 at 4:40 PM Jeff Blaine <KeepWalking188 at ac0c.com> wrote:
>
>> Take a look at the plots at the bottom of this page.
>>
>> http://hpmemoryproject.org/technics/bench/3048/hp_sources_02.htm
>>
>> Note the 8642b vs the 3325B.  The '42b has much lower ultimate noise far
>> out but see how decent the 3325B is in comparison.  HP really made great
>> stuff back in the day!!!
>>
>>
> Thanks for pointing out that page. My measurements of my 8642A looked
> better than that far out, but are pretty similar close in. Comparing the
> 3325B to my measurements of TCXOs and transmit Phase noise of the TS-590,
> I'm not sure it will be good enough far out to meet the 590's original
> performance.
>
> On Tue, Jan 1, 2019 at 4:29 PM Brooke Clarke <brooke at pacific.net> wrote:
>
>> Hi Mark:
>>
>> It's not clear to me why pager testing requires such good phase noise.  I
>> wonder if some of the amateur modes also have
>> that need?
>> Maybe WSPR?
>> https://prc68.com/I/DRM.shtml#WSPR
>>
>>
> The reason for good phase noise in amateur gear is if you operate in close
> proximity to another strong station while trying to receive a weak one. The
> phase noise will cause far out noise from the strong signal to overwhelm
> the weak one. There are lots of examples on the web, explained better than
> I could.
>
> Regards,
>
> Mark
> W7MLG
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