[time-nuts] Modern signal generators

[Bob kb8tq]

Hi

There are I2C versions that can be set to “any frequency”. That’s what people are using 
for synthesizers in radios. Again - one can debate just how good an idea this all is. 

Bob

> On Dec 11, 2018, at 1:23 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> 
> 
> 
> On 12/11/2018 9:13 AM, djl 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.
> 
> I was talking about making a programmable frequency synthesizer
> with a DDS, to use as a general purpose signal generator.
> 
> A silabs part functions exactly the same as a crystal oscillator
> once it receives its one-time programming at the factory, AFAIK.
> 
> Of course a crystal oscillator has better spectral purity than
> a frequency synthesizer.  But it doesn't make a signal generator.
> 
> Am I missing something?
> 
> BTW, you can do even better than Silabs with an actual crystal
> oscillator such as those made by Crystek.
> 
> Rick
> 
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