Hi
As I said, just how rational using these parts in a radio …. not at all clear
to me.
Back when I went to school, stuff that was this noisy was not in the “greatest”
category.
That was a *very* long time ago.
Oddly enough best performance synthesizers have gotten better. (as the posted
prese
yes
In a message dated 12/11/2018 5:29:23 PM Eastern Standard Time,
k8yumdoo...@gmail.com writes:
Ulrich,
Is it OK for us to forward the URL for your "Noise" paper to others
outside the time-nuts group?
Thanks,
Dana K8YUM
On Tue, Dec 11, 2018 at 9:24 AM Ulrich Rohde via time-nuts <
tim
You can solve the spur problem by using the signal to lock an oscillator.
Some added phase noise but the oscillator can be very pure otherwise. Many
years ago I wrote an unsuccessful proposal for a synthesizer using that idea,
since the spectral purity spec was too tight to use synthesizer ou
Ulrich,
Is it OK for us to forward the URL for your "Noise" paper to others
outside the time-nuts group?
Thanks,
Dana K8YUM
On Tue, Dec 11, 2018 at 9:24 AM Ulrich Rohde via time-nuts <
time-nuts@lists.febo.com> wrote:
>
> https://badw.de/fileadmin/members/R/3685/6_4_18_UNI_BW_June18-safe.pd
Am 11.12.18 um 20:30 schrieb jimlux:
On 12/11/18 10:23 AM, Richard (Rick) Karlquist wrote:
On 12/11/2018 9:13 AM, djl wrote:
Rick: I've spent some time with the dds blocks. We found them to
generate lots of low level spurs, making lots of "birdies" when used
as local oscillators in receiver
On 12/11/2018 11:30 AM, jimlux wrote:
Most of the Silabs parts are available in an I2C programmable version
rather than the factory programmed flavor.
That's for clarifying that. The web site is hard
to navigate. I see that the phase noise is not
even close to an HP 8662 and the VCXO
On 12/11/18 10:23 AM, Richard (Rick) Karlquist wrote:
On 12/11/2018 9:13 AM, djl wrote:
Rick: I've spent some time with the dds blocks. We found them to
generate lots of low level spurs, making lots of "birdies" when used
as local oscillators in receivers.
We had better results using:
https:
Hi
There are I2C versions that can be set to “any frequency”. That’s what people
are using
for synthesizers in radios. Again - one can debate just how good an idea this
all is.
Bob
> On Dec 11, 2018, at 1:23 PM, Richard (Rick) Karlquist
> wrote:
>
>
>
> On 12/11/2018 9:13 AM, djl wrote:
On 12/11/2018 9:13 AM, djl wrote:
Rick: I've spent some time with the dds blocks. We found them to
generate lots of low level spurs, making lots of "birdies" when used as
local oscillators in receivers.
We had better results using:
https://www.silabs.com/products/timing/oscillators.
I was
Hi
I don’t know if it’s expected / surprising / alarming, but a lot of pretty well
respected
amateur transceivers have the SiLabs parts buried in the heart of their
“synthesizer”
section. Cost (obviously) is an issue in any design. That said, they seem to be
“good
enough” that the designers do
Rick: I've spent some time with the dds blocks. We found them to
generate lots of low level spurs, making lots of "birdies" when used as
local oscillators in receivers.
We had better results using:
https://www.silabs.com/products/timing/oscillators.
These may be used with GPSDO clocks for accur
This will be interesting to read. Around 15 years ago,
when I was working for Agilent, OEO was the "next big
thing" and they invested a lot of resources in it. Then
they abandoned it. I can't remember exactly what the
reason was.
Rick
On 12/11/2018 7:17 AM, Ulrich Rohde via time-nuts wrote:
Another gold mine. I used to work for Agilent/Keysight so I
am very familiar with their signal generators. It
will be interesting to see the R&S viewpoint. The DDS
stuff is very valuable. I have been considering using
a DDS eval board with a low noise 1 GHZ reference to
make a poor man's signa
https://badw.de/fileadmin/members/R/3685/6_4_18_UNI_BW_June18-safe.pdf
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Update :
https://badw.de/fileadmin/members/R/3685/Optoelectronic_Oscillators.pdf
73 de Ulrich
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