[Elecraft] New Synth Observation...

[Ian Wilson]

Does the new synthesizer use the same approach as the
previous one (DDS-steered PLL), or does it use something
like the Si5351A?

73, ian K3IMW

On Thu, Apr 16, 2015 at 8:47 AM, David Cole <dave at nk7z.net> wrote:

> Hello all,
> I noticed something about the new synthesizers...
>
> I like to monitor the Ionosphere changes, using a program called
> SBSpectrum.  This allows very, very, small changes in frequency to be
> shown graphically.  Changes on the order of only a few parts of a HZ.
>
> In the past, (Icom 756 PROIII), I had no issues...  Very smooth lines on
> the graph, no steps, all very somooth.
>
> With the old synthesizers, no issue, same thing, smooth lines.
>
> With the new synthesizers, I now see a saw tooth stepped shape to the
> trace.  As if the synthesizer is detecting a change in frequency, then
> correcting for it in a single "largish" step.  Largish being a few
> tenths of a HZ.
>
> Could someone comment on this change, either form Elecraft, or
> elsewhere?  Is there a way to reduce the step size?
>
>
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
> for MixW support see;
> http://groups.yahoo.com/neo/groups/mixw/info
> for Dopplergram information see:
> http://groups.yahoo.com/neo/groups/dopplergram/info
> for MM-SSTV see:
> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>
>
>
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