[hpsdr] Phoenix onboard 1GHz clock and project status

[Andrew]

Hi Richard,

Understood, I did wonder if that was the case as the DDS can accept a clock input up to 200MHz, however using the internal vco will degrade the potential phase noise performance but probably quite acceptable, and still better than typical black boxes! 

Heard about Cyclops, sounds very interesting, given software development its capabilities are fantastic!
How fast does Phil think it will do a 1GHz sweep?
Thanks,
Andrew


----- Original Message ----
From: Richard Hosking <richardh at iinet.net.au>
To: Andrew <irbsurfing at yahoo.co.uk>
Cc: hpsdr at lists.hpsdr.org
Sent: Thursday, 26 June, 2008 3:00:07 PM
Subject: Re: [hpsdr] Phoenix onboard 1GHz clock and project status

Thanks Andrew
We were planning to use the internal DDS PLL to multiply the 125MHz 
clock as the reference.
There may well be errors in the design  - it is only my eyes so far.
Kits of parts are still being collected - shouldnt be to long before an 
alpha board.
I was at Phil Harman';s house tonight - proof of concept for the Cyclops 
spectrum analyser is getting there - front end  as far as the 96MHz IF 
seems to work.

Richard
VK6BRO

Andrew wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>  
>
> ------------------------------------------------------------------------
>
> Hi All,
> Been looking at the Phoenix schematics and in particular the 1GHz clock.
> Looks like a very good board and I'm looking forward to seeing some 
> alpha results.
> However I'm a bit confused by the DDS clocking arrangement.
> There is a discrete crystal oscillator at 125MHz but the schematic 
> sheet is labelled 1GHz clock.
> One would therefore assume that the 8th harmonic from the mmic buffer 
> will be used to clock the DDS, if this is the case then there looks to 
> be a lot of filtering missing which would be needed to suppress the 
> lower harmonics??
> Am I missing something??? maybe someone could enlighten me?
>
> Many thanks,
> Andrew
>
> Bye the way, how is the project going, have boards been built yet?
> Any ideas about final populated board costs and target dates?
>
>
> ------------------------------------------------------------------------
> Not happy with your email address?
> Get the one you really want <http://uk.docs.yahoo.com/ymail/new.html> 
> - millions of new email addresses available now at Yahoo! 
> <http://uk.docs.yahoo.com/ymail/new.html>
> ------------------------------------------------------------------------
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/

________________________________
 Not happy with your email address? 
Get the one you  really want - millions of new email addresses available now at Yahoo!


      __________________________________________________________
Not happy with your email address?.
Get the one you really want - millions of new email addresses available now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20080627/40b572c8/attachment-0003.htm>