[Elecraft] New Synth Observation...

[Eric Swartz - WA6HHQ, Elecraft]

Si570.

Eric
elecraft.com

On 4/16/2015 10:02 AM, Ian Wilson wrote:
> 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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