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New Synth Observation...

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NK7Z

New Synth Observation...

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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Ian Wilson

Re: New Synth Observation...

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 <[hidden email]> 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
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Eric Swartz - WA6HHQ

Re: New Synth Observation...

Administrator

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 <[hidden email]> 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
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]