<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt">Hi Richard,<br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">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! <br><br>Heard about Cyclops, sounds very interesting, given software development its capabilities are fantastic!<br>How fast does Phil think it will do a 1GHz sweep?<br>Thanks,<br>Andrew<br><br><div
style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ----<br>From: Richard Hosking <richardh@iinet.net.au><br>To: Andrew <irbsurfing@yahoo.co.uk><br>Cc: hpsdr@lists.hpsdr.org<br>Sent: Thursday, 26
June, 2008 3:00:07 PM<br>Subject: Re: [hpsdr] Phoenix onboard 1GHz clock and project status<br><br>Thanks Andrew<br>We were planning to use the internal DDS PLL to multiply the 125MHz <br>clock as the reference.<br>There may well be errors in the design - it is only my eyes so far.<br>Kits of parts are still being collected - shouldnt be to long before an <br>alpha board.<br>I was at Phil Harman';s house tonight - proof of concept for the Cyclops <br>spectrum analyser is getting there - front end as far as the 96MHz IF <br>seems to work.<br><br>Richard<br>VK6BRO<br><br>Andrew wrote:<br>> ***** High Performance Software Defined Radio Discussion List *****<br>><br>> <br>><br>> ------------------------------------------------------------------------<br>><br>> Hi All,<br>> Been looking at the Phoenix schematics and in particular the 1GHz clock.<br>> Looks like a very good board and I'm looking forward to seeing
some <br>> alpha results.<br>> However I'm a bit confused by the DDS clocking arrangement.<br>> There is a discrete crystal oscillator at 125MHz but the schematic <br>> sheet is labelled 1GHz clock.<br>> One would therefore assume that the 8th harmonic from the mmic buffer <br>> will be used to clock the DDS, if this is the case then there looks to <br>> be a lot of filtering missing which would be needed to suppress the <br>> lower harmonics??<br>> Am I missing something??? maybe someone could enlighten me?<br>><br>> Many thanks,<br>> Andrew<br>><br>> Bye the way, how is the project going, have boards been built yet?<br>> Any ideas about final populated board costs and target dates?<br>><br>><br>> ------------------------------------------------------------------------<br>> Not happy with your email address?<br>> Get the one you really want <<a rel="nofollow" target="_blank"
href="http://uk.docs.yahoo.com/ymail/new.html">http://uk.docs.yahoo.com/ymail/new.html</a>> <br>> - millions of new email addresses available now at Yahoo! <br>> <<a rel="nofollow" target="_blank" href="http://uk.docs.yahoo.com/ymail/new.html">http://uk.docs.yahoo.com/ymail/new.html</a>><br>> ------------------------------------------------------------------------<br>><br>> _______________________________________________<br>> HPSDR Discussion List<br>> To post msg: <a rel="nofollow" ymailto="mailto:hpsdr@hpsdr.org" target="_blank" href="mailto:hpsdr@hpsdr.org">hpsdr@hpsdr.org</a><br>> Subscription help: <a rel="nofollow" target="_blank" href="http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org">http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org</a><br>> HPSDR web page: <a rel="nofollow" target="_blank" href="http://hpsdr.org">http://hpsdr.org</a><br>> Archives: <a rel="nofollow" target="_blank"
href="http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/">http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/</a><br></div></div></div><br><hr size="1">
Not happy with your email address?
<br><a rel="nofollow" target="_blank" href="http://uk.docs.yahoo.com/ymail/new.html"> Get the one you
really want</a> - millions of new email addresses available now at <a rel="nofollow" target="_blank" href="http://uk.docs.yahoo.com/ymail/new.html"> Yahoo!</a></div></div></div><br>
<hr size=1>
Not happy with your email address?
<br> <a href="http://uk.docs.yahoo.com/ymail/new.html"> Get the one you
really want</a> - millions of new email addresses available now at <a
href="http://uk.docs.yahoo.com/ymail/new.html"> Yahoo!</a></body></html>