Driscoll wrote a lot about oscillators over the years.
I couldn't find anything specific to discontinuous operation.
Do you have a titel of a paper related to this?
What Driscoll was talking about was self limiting in a
transistor. That is discontinuous operation, although
Driscoll doesn't c
Hoi Will,
On Mon, 09 Nov 2015 14:09:27 +1300
Will wrote:
> Ham Radio Magazine used to be available on archive.org but has been
> removed. 73 Magazine is still available.
>
> CD's of it are available (expensive).
>
> I'll look later and see which issue it was.
Thanks. I already got a copy of
Hi ,
Ham Radio Magazine used to be available on archive.org but has been
removed. 73 Magazine is still available.
CD's of it are available (expensive).
I'll look later and see which issue it was.
Cheers,
Will
On 09/11/15 11:19, Attila Kinali wrote:
> Salut,
>
> Thanks everyone for answering m
Salut,
Thanks everyone for answering my questions and englighting me on
the general topic.
Sorry for the late answer from my side. It took me some time to
read up on all the pointers and hints provided. I'll quickly add
some comments and questions to a few of the mails, that I find
noteworth, wh
On 10/28/15 4:29 PM, Adrian wrote:
That's chapter 6 of his book.
http://rubiola.org/indexx-oscillator-noise.html
Just scroll down for the phase noise plots.
The left hand column of plots contains the essentials.
Adrian
what would be nice is some similar simple analysis for lower performing
Hi
They do it pretty much the same way everybody else makes the same
sort of oscillators. Design, build, tune / select, test, re-tune/ select,
re-test.
The amount of test / tune depends enormously on what level of oscillator
is being made. > 80% of the volume shipped gets relatively less effort
Yes, more the termination Ulrich
In a message dated 10/28/2015 9:02:56 P.M. W. Europe Standard Time,
mag...@rubidium.dyndns.org writes:
Hi,
It is well worth mentioning that a crystal filter on the output can
become a challenge, as the source impedance can be far from 50 Ohm, and
t
Hi Rick,
any info on how Wenzel makes that low noise oscillators?
73
KJ6UHN
Alex
On 10/28/2015 3:04 PM, Richard (Rick) Karlquist wrote:
Do you have a specific URL for "hacking oscillators"? I can't
find it on Rubiola's web site.
Rick
On 10/28/2015 1:32 PM, Gerhard Hoffmann wrote:
Am 28.10.20
That's chapter 6 of his book.
http://rubiola.org/indexx-oscillator-noise.html
Just scroll down for the phase noise plots.
The left hand column of plots contains the essentials.
Adrian
Richard (Rick) Karlquist schrieb:
> Do you have a specific URL for "hacking oscillators"? I can't
> find it on
It's chapter 6 in his phase noise book.
Cheers,
Magnus
On 10/28/2015 11:04 PM, Richard (Rick) Karlquist wrote:
Do you have a specific URL for "hacking oscillators"? I can't
find it on Rubiola's web site.
Rick
On 10/28/2015 1:32 PM, Gerhard Hoffmann wrote:
Am 28.10.2015 um 19:22 schrieb KA2W
6 - Oscillator hacking pp. 150-191 -
http://ebooks.cambridge.org/chapter.jsf?bid=CBO9780511812798&cid=CBO9780511812798A053
2 Oscillator hacking - http://arxiv.org/pdf/physics/0502143.pdf
A weird example; The effect of the output buffer; Oscillator hacking -
http://rubiola.org/pdf-slides/2009T
Am 28.10.2015 um 23:04 schrieb Richard (Rick) Karlquist:
Do you have a specific URL for "hacking oscillators"? I can't
find it on Rubiola's web site.
It is a chapter in his book where he analyzes the form of the noise spectra.
___
time-nuts mailing li
Do you have a specific URL for "hacking oscillators"? I can't
find it on Rubiola's web site.
Rick
On 10/28/2015 1:32 PM, Gerhard Hoffmann wrote:
Am 28.10.2015 um 19:22 schrieb KA2WEU--- via time-nuts:
This oscillator seems to have been more a frequency standard then a noise
standard. Today's
On 10/28/2015 10:38 AM, Hal Murray wrote:
rich...@karlquist.com said:
The 2N5179 in the 10811 is selected for minimum beta and Ft at 20 mA, which
is the start up condition due to the ALC being at full gain. It has a
special HP part number, so you wouldn't know this just looking at the parts
li
Am 28.10.2015 um 19:22 schrieb KA2WEU--- via time-nuts:
This oscillator seems to have been more a frequency standard then a noise
standard. Today's 10 MHz oscillators are different/better, such a crystal is
no longer available/made.
Yes. Rubiola gives it the credit of being able to be mass-pr
This oscillator seems to have been more a frequency standard then a noise
standard. Today's 10 MHz oscillators are different/better, such a crystal is
no longer available/made.
I have more experience with 100 MHz, 125 and 128 MHz. Once I am back in the
USA I will send some measured results
Hi,
It is well worth mentioning that a crystal filter on the output can
become a challenge, as the source impedance can be far from 50 Ohm, and
thus a bit of a challenge depending on how you measure.
Cheers,
Magnus
On 10/28/2015 06:11 AM, Bruce Griffiths wrote:
Ulrich
Surely you meant to w
rich...@karlquist.com said:
> The 2N5179 in the 10811 is selected for minimum beta and Ft at 20 mA, which
> is the start up condition due to the ALC being at full gain. It has a
> special HP part number, so you wouldn't know this just looking at the parts
> list.
How much of a difference does t
On 10/27/2015 10:11 PM, Bruce Griffiths wrote:
The answer to this conundrum is surely that the equation for PN doesn't apply
directly in this case
for offset frequencies outside the crystal bandwidth.
The Crystal actually bandpass filters the signal and PN noise generated by
oscillator.
For of
Ulrich
Whilst I do have an original somewhere, a pdf version can be found here:
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf
Bruce
On Wednesday, 28 October 2015 7:07 PM, Bruce Griffiths
wrote:
Ulrich
Surely you meant to write
PN(SSB) = -177 -Pout + NF
If we attem
Ulrich
Surely you meant to write
PN(SSB) = -177 -Pout + NF
If we attempt to apply this equation to the 10811A for which you measured a PN
floor of -174dBc/Hz
this implies that
NF - Pout = 3dB
Best case (NF = 0dB - unlikely! Pout would need to be much higher for nonn zero
NF)
Pout =-3dBm or
I have bought and measured the hp10811 at about -174dBc/Hz. The
interesting thing is the feedback capacitor from collector to base which
changes
Rin=1/gm.
Unless the circuit has a hidden Q mulitplier the PN (SSB) can never be
better then 177 (kT) in dBm + Pout in dBm - NF of the oscil
On 10/26/2015 9:15 PM, Bruce Griffiths wrote:
The 10811A ocxo uses an oscillator of this type albeit with a lower crystal
current, an overtone crystal. However the output stages spoil the PN
floor..Cascaded transformer coupled CB stages are somewhat quieter.
Bruce
That's right. Burgoon (10
Hi
> On Oct 27, 2015, at 12:15 AM, Bruce Griffiths
> wrote:
>
> The 10811A ocxo uses an oscillator of this type albeit with a lower crystal
> current, an overtone crystal. However the output stages spoil the PN
> floor..Cascaded transformer coupled CB stages are somewhat quieter.
….. and sin
As Rick has pointed out numerous times when the output signal is extracted via
the crystal by a CB stage (or cascade thereof) the PN floor is determined by
the ratio of the amplifier equivalent input noise current to the crystal
current. That is the amplifier equivalent input noise current at fr
The oscillator transistor and buffer amplifier are basically
the same as the HP 10811, except for the absence of mode
suppressors. The difference here is that the oscillator
self limits in the oscillator transistor, whereas the 10811
has ALC. The discontinuous operation of the transistor,
as exp
The 10811A ocxo uses an oscillator of this type albeit with a lower crystal
current, an overtone crystal. However the output stages spoil the PN
floor..Cascaded transformer coupled CB stages are somewhat quieter.
Bruce
On Tuesday, 27 October 2015 2:31 PM, Bruce Griffiths
wrote:
V
Various versions of this oscillator circuit have been employed as high
stability OCXOs eg:
http://ri.search.yahoo.com/_ylt=AwrTcaxMzS5WgJIAMwk3QIpQ;_ylu=X3oDMTBzbW1zYXBzBHNlYwNzcgRwb3MDMjEEY29sbwNncTEEdnRpZAM-/RV=2/RE=1445936589/RO=10/RU=https%3a%2f%2fescies.org%2fdownload%2fwebDocumentFile%3fid%
On Tuesday, October 27, 2015 12:03:49 AM Attila Kinali wrote:
> Hi,
>
> I've been trying to read up on low noise crystal oscillators and had
> a closer look at the design by Bruce Griffiths[1]. There are explanations
> to how the circuit works, but I have some questions on the details.
> I would a
Hi
> On Oct 26, 2015, at 7:03 PM, Attila Kinali wrote:
>
> Hi,
>
> I've been trying to read up on low noise crystal oscillators and had
> a closer look at the design by Bruce Griffiths[1]. There are explanations
> to how the circuit works, but I have some questions on the details.
> I would app
Hi,
I've been trying to read up on low noise crystal oscillators and had
a closer look at the design by Bruce Griffiths[1]. There are explanations
to how the circuit works, but I have some questions on the details.
I would appreciate if someone could answer these questions.
[1] http://www.ko4bb.c
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