[ARC5] [Milsurplus] AD9850 DDS Freq. Syth Module

[mstangelo at comcast.net]

The spurs generated by the AD9850 abd AD9851 are not that objectionable.

If you're concerned about spurs and phase noise I would use a DDS which has more resolution (more bits) in the D to A converter such as the AD9951. Check out WA1FFL's kit:

<http://www.wa1ffl.com/>

I believe the concern about DDS spurs is overblown. ICOM uses the AD9951 in their IC-7000 and IC-7200 for their synthesizer and I haven't heard complaints about spurs.

<http://www.ab4oj.com/icom/trend.html>

Mike N2MS
----- Original Message -----
From: Bruce Long <coolbrucelong at yahoo.com>
To: George at MaierGroup.com, arc5 at mailman.qth.net
Sent: Fri, 22 Mar 2013 23:44:54 -0000 (UTC)
Subject: Re: [ARC5] [Milsurplus] AD9850 DDS Freq. Syth Module

George. I don&#x27;t know anything about the product you refered to but years ago as part of my day job I freq locked a ocxo quartz osc to a gps receiver using that general approach   It worked great with no big problems 

As an ex high performance receiver designer at wj I am uncomfortable with the spurs generated bu Dds sources although I admit the dds spur level is too low to worry about in most ham applications.  I like the idea of a good lc vfo stabilized wIth a non PLL approach 
bruce