[hpsdr] Crystal Oscillator for AD9912

[brainerd at wildblue.net]

Chris:

  I am definitely interested in your design.  I just got the pre-production 
boards for my 9912 board.  It has provision for either an on-board can 
oscillator(CMOS, LVDS, or Si57X) as well as an external oscillator input.  
Also, by an accident in design, the can oscillator output is available via the 
ext osc input sma.

Dave - WB6DHW
<http://wb6dhw.com>

<
> Hello Richard
> 
> As I think you know, I've been working on a very low noise, 10MHz
> lockable, 1GHz clock for the AD9912 on behalf of the uWSDR group. To do it
> really well is surprisingly non-trivial. The design will also have
> implications for other amateur microwave applications.
> 
> My suggestion is that, even if you choose to use a packaged oscillator or
> a discrete crystal, you make the 1GHz input accessible via an SMA
> connector so that using an external clock module is reasonably easy!
> 
> As to cost, it's still difficult to give an estimate, particularly as good
> crystals can cost a lot of money. With a good, but not exceptional VHF
> crystal, ordered in 100s I guess that USD30 - USD50 would cover BOM cost
> of my design.
> 
> I hope to be able to post the very low noise VHF oscillator design (uWSDR
> project DISTAW) which forms the heart of the on the uWSDR web site in the
> not too distant future. I'll announce it on the hpsdr list when I do.
> 
> Vy 73
> 
> Chris
> GW4DGU
> 

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