[time-nuts] 10 MHz oscillators vs 100 MHZ

[KA2WEU at aol.com]

Hi John,
 
thanks, I am more interested in the inner workings of the 10 MHz  
oscillators, and why they are about 10 db  shy in phase noise.
 
And yes I have build 100 MHz oscillators with -145 .
 
Thanks , Ulrich 
 
 
In a message dated 12/2/2014 6:29:10 P.M. Eastern Standard Time,  
john at miles.io writes:

NEL has  great OCXOs.  Also worth checking out Wenzel (they own Croven 
Crystals  and will sell them separately), Rakon, and Vectron.

I haven't seen any  100 MHz OCXOs rated for -145 at 100 Hz, but -135 can be 
had.

-- john,  KE5FX
Miles Design LLC


> -----Original Message-----
>  From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of  Ulrich
> Rhode via time-nuts
> Sent: Tuesday, December 02, 2014  10:27 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] 10  MHz oscillators vs 100 MHZ
> 
> Hi from NJ,
> 
> I am  more involved in 100 Mhz to 128 MHz crystal oscillators and their
>  measurements,  10 MHz design is new for me.
> 
> I have  analyzed and measured the famous HP 10 MHz SC based oscillator,
>  disassembled it, admired and measured the crystal. Does anyone still  
makes
> such
>  a large and good device.   Congratulations to the "inventor" of this
> oscillator !!
>  
> Looking at 100 MHz oscillators, they have 18 to 20 dBm output and  are
> advertised at -145 dBc/Hz at 100 Hz offset and - 187 dBc/Hz at 1  MHz, 
the 10
> MHz
>  oscillator just gets -165 dBc/Hz far off  with NEL looking as the  best.
> 
> Who can get me up to  speed ?
> 
> Thanks, Ulrich ,  N1UL