it is a way to use a carrier fc to make one SSB signal with fm
modulation frequency, use just the side-band, , which have a frequency
of fc + fm = fR, [fR/fc is a function of the SSB modulator carrier
suppression capability,] fm could be from less than 1/2 fc any
frequency to zero, if it is
On Fri, 29 Jul 2016 00:26:07 + (UTC)
Bruce Griffiths wrote:
> Diophantine Frequency Synthesizer Design for Timekeeping Systems
I quickly went over the papers people have pointed me at. Without
having gone through all the math, the idea for choosing the PLL values
Diophantine Frequency Synthesizer Design for Timekeeping Systems
| |
| | | | | | | |
| Diophantine Frequency Synthesizer Design for Timekeepi...Abstract Diophantine
Frequency Synthesis (DFS), a number-theoretic approach to the design of very
high resolution frequency synthesizers,
On Thu, 28 Jul 2016 14:06:09 -0700
Alex Pummer wrote:
> On 7/28/2016 11:03 AM, Attila Kinali wrote:
> > On Fri, 22 Jul 2016 08:19:43 + (UTC)
> > Bruce Griffiths wrote:
> >
> >> No, the first one merely uses a pair of cascaded heterodyne PLLs
>
if you send the circuit to me Attila, I would try to help you
73
KJ6UHN
Alex
by the way aside of that ham license, I have some fifty years of
experience and also an MSEE
On 7/28/2016 11:03 AM, Attila Kinali wrote:
On Fri, 22 Jul 2016 08:19:43 + (UTC)
Bruce Griffiths
On Fri, 22 Jul 2016 08:19:43 + (UTC)
Bruce Griffiths wrote:
> No, the first one merely uses a pair of cascaded heterodyne PLLs
> as shown on p3 of the manual.
Ok. I tried to understand how this circuit works. While I can see
how a small and precise frequency
Hi
A typical double oven design runs about 10 mw or so in the circuitry
in the inner oven. The “stuff” inside the outer oven likely doubles that
number.
The rest of the circuit is put outside the outer oven to reduce heat rise. There
could be another 40 mw in that part of the circuit.
> 24 bit DAC
Which chip are you using? How many useful bits do you think you will get?
--
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Richard (Rick) Karlquist writes:
> The last thing you want in an oven is a lot of
> added thermal overhead, especially in a double oven
> where you already fighting against running out of
> temperature range. If you want to ovenize everything
> but the kitchen sink, put it in it's
On 7/24/2016 6:44 AM, James Flynn wrote:
Hal Murray writes:
Has anybody put the DAC and all of the analog stuff inside the oven?
Seems
like an obvious idea so somebody has probably patented it.
I am using a 5 MHz custom built design which has everything inside the
outer oven
Hal Murray writes:
> That still leaves the temperature quirks of the DAC and amplifiers.
>
> Has anybody put the DAC and all of the analog stuff inside the oven?
Seems
> like an obvious idea so somebody has probably patented it.
>
I am using a 5 MHz custom built design which
Hal wrote:
There are 2 markets for DACs and ADCs. I'll call them DC and RF, but the RF
goes down to audio.
In the DC market, the data sheet talks about linearity and usually covers
temperature stability.
* * *
In the RF market, nobody cares about temperature drift.
By far the
On Fri, July 22, 2016 2:15 pm, Hal Murray wrote:
> Has anybody put the DAC and all of the analog stuff inside the oven?
I ran across some OCXO's with a DAC inside the oven a few years back.
They were 5MHz instead of the 10MHz I was looking for so I didn't buy them
at the time. I have forgotten
att...@kinali.ch said:
> You can already get 24bit DAC's off the shelf from TI (DAC1282). I do not
> know how stable they are in reality. ...
There are 2 markets for DACs and ADCs. I'll call them DC and RF, but the RF
goes down to audio.
In the DC market, the data sheet talks about linearity
rich...@karlquist.com said:
> That's what we tried to do with the E1938A. A multiplying DAC is used based
> on a reference that is ovenized instead the crystal oven. That certainly
> eliminated the tempco issue with the reference, but then we discovered 1/f
> noise on the reference. We had to
In message <20160722113312.f1f292c42ba086aafd6d4...@kinali.ch>, Attila Kinali w
rites:
>You can already get 24bit DAC's off the shelf from TI (DAC1282).
Precisely(!) as stable as the voltage reference you feed them.
These are oversampling designs which *by definition* cannot attenuate
On 7/22/2016 10:15 AM, David wrote:
It is too bad voltage control of an oscillator cannot be made
ratiometric. Or can it? I have never heard of such a thing. That
would remove some of the demands on a low drift reference.
That's what we tried to do with the E1938A. A multiplying DAC
On Fri, 22 Jul 2016 11:33:12 +0200, you wrote:
>On Thu, 21 Jul 2016 22:22:14 -0500
>David wrote:
>
>> Increased integration has only helped insofar as you can attempt
>> designs which would have been prohibitive before.
>>
>> I keep trying to come up with a charge
Capacitor matching (Moore's law) has improved for switch-cap designs.
Also depends on the tuning gain, 10 ppm/V would be very demanding versus 10
ppb/V.
On Thu, Jul 21, 2016 at 9:47 PM, Richard (Rick) Karlquist <
rich...@karlquist.com> wrote:
>
>
> On 7/21/2016 4:56 PM, Nick Sayer via time-nuts
SpectraDynamics HROG 5/10
http://www.spectradynamics.com/products/hrog-10-high-resolution-phase-and-frequency-offset-generator/
On 22. jul. 2016, at 09.49, Anders Wallin wrote:
>> rich...@karlquist.com said:
>>> Also in 1996, phase microsteppers were already legacy
On 7/22/2016 2:22 AM, Attila Kinali wrote:
Hoi Rick,
On Thu, 21 Jul 2016 18:47:24 -0700
"Richard (Rick) Karlquist" wrote:
Also in 1996, phase microsteppers were already legacy
technology and didn't have a good reputation for spectral
purity. Another non-panacea.
If
On Thu, 21 Jul 2016 22:22:14 -0500
David wrote:
> Increased integration has only helped insofar as you can attempt
> designs which would have been prohibitive before.
>
> I keep trying to come up with a charge balancing design but what about
> Linear Technology's solution
quency measurement <time-nuts@febo.com>
Sent: Friday, 22 July 2016 7:49 PM
Subject: Re: [time-nuts] NCOCXO anyone?
> rich...@karlquist.com said:
> > Also in 1996, phase microsteppers were already legacy technology and
> didn't
> > have a good reputation for spectral purity.
> rich...@karlquist.com said:
> > Also in 1996, phase microsteppers were already legacy technology and
> didn't
> > have a good reputation for spectral purity. Another non-panacea.
>
> What is a phase microstepper and/or how does it compare to a DDS?
>
> (Google gets lots of hits, but they all
rich...@karlquist.com said:
> Also in 1996, phase microsteppers were already legacy technology and didn't
> have a good reputation for spectral purity. Another non-panacea.
What is a phase microstepper and/or how does it compare to a DDS?
(Google gets lots of hits, but they all refer to
On Thu, 21 Jul 2016 18:47:24 -0700, you wrote:
>On 7/21/2016 4:56 PM, Nick Sayer via time-nuts wrote:
>
>> Oh my. Thats a bit more than I was originally considering
What I had in
>> mind was adding a DAC front end to an OCXO so that you could tune the EFC
>> with serial commands rather than
On 7/21/2016 4:56 PM, Nick Sayer via time-nuts wrote:
Oh my. That’s a bit more than I was originally considering… What I had in mind
was adding a DAC front end to an OCXO so that you could tune the EFC with
serial commands rather than analog and calling that a product.
20 years ago when
esolution phase measurement
>> technique was confirmed with the PicoPak project:
>>
>> http://www.wriley.com/PicoPak%20App%20Notes%20Links.htm
>>
>> So, yes, please take the bait and play with all aspects of your NCOCXO idea.
>>
>> /tvb
>>
>>
Hi
> On Jul 21, 2016, at 7:17 PM, Poul-Henning Kamp wrote:
>
>
> In message <4763643485B04450A76F7C04BA8CFB63@pc52>, "Tom Van Baak" writes:
>
>> There are highly-prized commercial instruments that do this. But
>> no amateur has tried yet.
>
> It would be more
confirmed with the PicoPak project:
>
> http://www.wriley.com/PicoPak%20App%20Notes%20Links.htm
>
> So, yes, please take the bait and play with all aspects of your NCOCXO idea.
>
> /tvb
>
> - Original Message -
> From: "Nick Sayer via time-nuts"
In message <4763643485B04450A76F7C04BA8CFB63@pc52>, "Tom Van Baak" writes:
>There are highly-prized commercial instruments that do this. But
>no amateur has tried yet.
It would be more precise to say that no amateur has been willing to
talk about their results yet.
I personally know
-nuts@febo.com>
Sent: Thursday, July 21, 2016 10:05 AM
Subject: [time-nuts] NCOCXO anyone?
> Would anyone see any value in a board that had an OH300 with a serial
> interface for tuning?
>
> I had a thought perhaps to make one starting with my GPSDO and just ditching
> the GPS par
Would anyone see any value in a board that had an OH300 with a serial interface
for tuning?
I had a thought perhaps to make one starting with my GPSDO and just ditching
the GPS part and possibly adding an RS-232 level converter. I could
conceivably bring it all out to a DB9 and emulate an
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