[R-390] Cosmos PTO end point adjustment

[rbethman]

Encoders in and of themselves, do NOT normally cause spurs.

One of the issues that IS directly a side effect of removing the PTO and 
replace with an encoder system - It *IS* a "Permeability Tuned 
Oscillator".  Therefore, you must ALSO create a "new" oscillator with 
oddball start point and endpoint since it WILL become a VFO, albeit a 
digital one.

Issues with digital encoders in HF (SS) equipment does turn up in 
YaeComWood receivers.  It is one of those I currently have that has the 
spurs.  They have now become MUCH worse since I performed an alignment 
and improved its sensitivity.

Everything has its good points and its bad points.

I'm "still" not leaving the "Blue Stripes"!

*MUST* be time to make another batch of Kielbasa and Pierogi!

Bob - N0DGN

On 4/21/2010 3:32 PM, 2002tii wrote:
> Bob wrote:
>
>    
>> I use encoders in VHF radios, I have one in an HF dedicated receiver.
>> (SS)  Birdies all over the place!
>>      
> There is no reason that encoders, or most digital circuitry, for that
> matter, must cause spurious emissions -- that is a matter of careful
> design.  I have a number of digital synthesizers and DSP projects,
> the spurious emissions from which are below the noise floor of all of
> my receivers.  In digital complexity/noise potential, some of these
> circuits rank up there with fully-spec'd four-processor PCs.
>
> I'm not recommending encoders or other digital solutions, just saying
> that the potential for generating spurious emissions can (and should)
> be handled in the design.
>
> Best regards,
>
> Don
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