Dear Ulrich,
Thanks for that additional information. I simply didn't know, and would
probably find out if I had dug out all the papers. I haven't done that
for this part of the field. Rather, it is only through discussions like
this that we get the accumulated knowledge, so no worries.
OK, good, more nice material to read. One learn things as one goes
along, and it is only through exchanges that one can learn more, love to
learn more! :)
The reference to Dieter Scherer is on page 5 already.
It would be handy if references to Dieter's contribution back in the day
could be located. Always good to bring forward some hard evidence to add
to the anecdotal part of insight. I could only find some HP seminiar
notes on http://hparchive.com/seminar_notes.htm
It is covered here from 1978:
http://hparchive.com/seminar_notes/Scherer_Low_noise_source_design_and_test.pdf
which on page 17 also have the same breakup of the modified Leeson model
as you have on page 9
Cheers,
Magnus
On 08/08/2016 01:24 AM, [email protected] wrote:
Good evening Magnus
Nice hearing again from you and I hate to disagree with you but you
are wrong , Leeson did not add the flicker effect , this was done by
my friend Dieter Scherer of HP, I added the neglected VCO term
(pushing) and Everett the important effect of unloaded vs loaded Q.
Please take a look at the complete modern liner noise equation to be
found in
https://www-docs.tu-cottbus.de/mikrowellentechnik/public/rohde/rohde2011ulr_habil_presentation.pdf
see page 9 !
A complete up to date non-linear noise model for LC oscillators and
its general validation can be found in
https://depositonce.tu-berlin.de/bitstream/11303/1306/1/Dokument_16.pdf
73 de Ulrich
In a message dated 8/7/2016 6:30:58 P.M. Eastern Daylight Time,
[email protected] writes:
Well, it is nothing but his personal recollection of the events, so
that
is expected. It represents one voice of several. Better have that on
record than it being lost. But it is not the complete story. That would
have to be collected over a much larger set of people.
BTW. Ref 44 in this paper is one of Edson's articles.
I've read Chapter 15 of Edson's book, and it provides a model, but fail
to include flicker noise, *which is in Leesons model*. It is a
straight-forward extension thought. I don't have access to any of his
articles, except the one-page letter that Rick linked.
There is surely more work to be done to build a more comprehensive
detail of events, show where ideas came up, was re-invented,
incorporated and extended. Edson clearly contributed.
Cheers,
Magnus
On 08/07/2016 06:32 PM, KA2WEU--- via time-nuts wrote:
> Here is another comment ;
>
>
> this paper is too self-centered for it to be the reliable historical
> report which we would like.
> It seems that Edson did some great work before,
>
>
> 73 de Ulrich , and I agree with the statement
>
>
>
>
>
> http://www.tubebooks.org/Books/vto.pdf
>
> Vacuum tube oscillators
>
>
>
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> xxxxxxxxxx
>
>
> In a message dated 8/6/2016 9:02:43 A.M. Eastern Daylight Time,
> [email protected] writes:
>
> Good morning,
>
> yes I saw the reference but he did not point out what it was or
> function,
> This paper is more about people and events and very little since
.......
>
> Ulrich
>
>
> In a message dated 8/6/2016 2:26:54 A.M. Eastern Daylight Time,
> [email protected] writes:
>
> On Sat, Aug 6, 2016 at 9:34 AM, KA2WEU--- via time-nuts
> <[email protected]> wrote:
>
>> Leeson produced a somewhat random selection of papers , omitting
> important
>> things like the sapphire based best in the word . This was not even
>> referenced .
>
> The reference [145] at the end of the sentence that mentions
sapphire
> oscillators also discusses a hybrid photonic-microwave
oscillator that
> incorporates a room-temperature sapphire oscillator so I think he
> tried to cover both subjects with that single reference.
>
> The paper has a misleading title. It suggests that it is a
history of
> the last 50 years, when it is about events roughly 50 years ago. The
> abstract makes this clear though. So I didn't really expect to read
> much about developments past 1970.
>
> Cheers
> Michael
>
>
> On Sat, Aug 6, 2016 at 9:34 AM, KA2WEU--- via time-nuts
> <[email protected]> wrote:
>> Some of the cited references are poor, modern non-linear
mathematic is
>
> kind
>> of omitted . After all the oscillator phase noise
speculation, I would
>> have really liked to see at last a reference about the most modern
>> measurements techniques and it validation. How do you calibrate a
> phase
> noise test
>> system.
>>
>> Leeson produced a somewhat random selection of papers , omitting
> important
>> things like the sapphire based best in the word . This was not even
>> referenced .
>>
>> I think he is really out of it .
>>
>> 73 de N1UL
>>
>>
>>
>> In a message dated 8/5/2016 7:11:18 P.M. Eastern Daylight Time,
>> [email protected] writes:
>>
>>>
>>> Very selected and incomplete references and the equally
important
>>> question
>>> of measurements strangely not covered
>>>
>>> 73 de N 1 UL
>>>
>>
>> I suppose he could write an equally-lengthy article on
measurements
> alone,
>> but leaving out the post-1970s history entirely was a little
>> disappointing. It was strange to hit "ctrl-f Rohde" and see
only one
> reference in the
>> bibliography. Same for "Hewlett." "Rubiola" brings up one
hit (but no
>> citations) and "Stein" brings up none at all.
>>
>> -- john, KE5FX
>> Miles Design LLC
>>
>>
>> _______________________________________________
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