[time-nuts] Odd-order multiplication of CMOS-output OCXO

[jimlux]

On 1/20/20 11:44 AM, Bob kb8tq wrote:
> Hi
> 
>> On Jan 20, 2020, at 2:38 PM, jimlux <jimlux at earthlink.net> wrote:
>>
>> On 1/20/20 10:01 AM, Mark Haun wrote:
>>
>>> A fair question... in fact I was initially planning to use the ABLNO +
>>> a PLL.  The OCXOs I found, however, are CTS VFOV405's with phase noise
>>> claimed to be just as good as the ABLNO or CVHD VCXOs:
>>> https://www.ctscorp.com/wp-content/uploads/VFOV405.pdf
>>> They are reasonably low power, small[-ish], and have adequate stability
>>> for my needs.  You can see why it is tempting to make the multiplier
>>> scheme work, as it should save on both power and board area. (The
>>> target application is a battery-powered SDR.)  So far there don't seem
>>> to be any show-stopper issues with the plan, except that I am going to
>>> have to put together a phase-noise measurement system, or find a friend
>>> with one.
>>
>> Have you checked delivery times? - Just because it's listed in the catalog does not mean you can get it in the next few weeks or months. If the online sources (Digikey, mouser, Newark, etc.) have them in stock, then you're good to go, but otherwise you could be looking at 6 months or more.
> 
> …. and maybe nasty stuff like minimum order quantities in the range of 10 or 20 pieces ( or prices below that which work out to the same thing).
> 
> 


Been there, done that.  I have a few extra 100 MHz tiny Vectron EX-421 
OCXOs at work because I had to order more than the 3 I needed. I need to 
find a project at work to use them.

These are 100MHz units, ran about $262 each (in qty 6) (I'm going to 
guess that Vectron has a minimum order of $1500 or something like that)

The PN performance is better than either of the other two, but it's also 
not a VCXO. It's probably "representative" of the performance that's 
achievable in a small package at low power, though.

FWIW, they seem to work fine in space, although they're not space 
qualified - over 6 months or so, I didn't see any particular changes in 
frequency compared to GPS or a CSAC that wouldn't just be aging.


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