[hpsdr] LO Source

[Philip Covington]

On 6/7/06, FRANCIS CARCIA <carcia at sbcglobal.net> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> I'm not a fan of DDS but I wonder if any of you guys have looked at the 9858
> as part of a pll. Check out the schematics of the eval board AD plans to
> sell.
> Drente did a QEX article a while back that used a DDS to generate a
> reference and the VCO ran with a fixed divide by N  back to the phase
> detector, so the tuning was via the DDS changing the reference.
> We should not settle for a source that has spurs 75 dB down and try for 100
> dB of dynamic range in the radio.
> Joining up with TAPR is like finding a new high yield oil field..good deal!
> frank wa1gfz

Hi Frank,

I am not sure that this approach would gain us anything for the HPSDR.
 I think the reason for the DDS as the reference is that it gives you
very small tuning steps (>> 1Hz).  In SDR we can deal with 10 kHz
tuning steps easily.

73 de Phil N8VB

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