Rick: I've spent some time with the dds blocks. We found them to
generate lots of low level spurs, making lots of "birdies" when used as
local oscillators in receivers.
We had better results using:
https://www.silabs.com/products/timing/oscillators.
These may be used with GPSDO clocks for accuracy, and generate less
noise. Cost is about the same; there are two or three sources for
breakout units. The clock sources do have to be 25/27 MHz, those from
Leo Bodnar, or use an OCXO. Digital attenuators are also available; all
this can be run from an Arduino with oled or other readouts, libraries
abound. And for quick and fancy GUI, on a pc, use MakerPlot.
Just $.02
Don
On 2018-12-11 09:46, Richard (Rick) Karlquist wrote:
Another gold mine. I used to work for Agilent/Keysight so I
am very familiar with their signal generators. It
will be interesting to see the R&S viewpoint. The DDS
stuff is very valuable. I have been considering using
a DDS eval board with a low noise 1 GHZ reference to
make a poor man's signal generator for my home lab.
Your paper will be required reading. I suspect a lot
of time nuts are in a similar situation as me.
Thanks.
Rick
On 12/11/2018 7:23 AM, Ulrich Rohde via time-nuts wrote:
https://badw.de/fileadmin/members/R/3685/6_4_18_UNI_BW_June18-safe.pdf
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Dr. Don Latham AJ7LL
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