[time-nuts] Modern signal generators

[Bob kb8tq]

Hi

I don’t know if it’s expected / surprising / alarming, but a lot of pretty well respected 
amateur transceivers have the SiLabs parts buried in the heart of their “synthesizer”
section. Cost (obviously) is an issue in any design. That said, they seem to be “good
enough” that the designers don’t go much further. 

Bob

> On Dec 11, 2018, at 12:13 PM, djl <djl at montana.com> wrote:
> 
> 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
> PO Box 404, Frenchtown, MT, 59834
> VOX: 406-626-4304
> 
> 
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