[hpsdr] Crystal Oscillator for AD9912

[Chris Bartram]

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