On Sun, 24 Jun 2018 14:05:52 -0700
Hal Murray wrote:
> Does anybody have a handy formula for the spurs given the parameters for a
> DDS?
I think, you are looking for [1] and [2].
But please note, that both phase truncation and DAC non-linearity
spurs can be reduced by the right use of
In principle DDS spurs due to phase truncation can be largely suppressed using
well known techniques when an FPGA is used just leaving spurs due to the DAC.
Bruce
> On 25 June 2018 at 06:00 Attila Kinali mailto:att...@kinali.ch > wrote:
>
>
> On Sun, 24 Jun 2018 17:29:43 +
>
Poul-Henning Kamp said:
> That's one of the reason I went with Bo's DDS (32bit0 instead of the eBay
> modules (20-24 bit). Higher resolution mitigates the spur problem at least a
> little bit.
I think it also moves the spurs closer in. But maybe if they are small enough
they get lost in the
This summer, somewhat coincidentally, I got to take a tour of some of the NIST
Time and Frequency Division, rode my motorcycle up to Fort Collins to see the
WWVB antennas, and attended the NIST 43rd Annual Time & Frequency Seminar. I
wrote a couple of blog articles with my notes and
In message , Bob kb8tq writes:
>The result can be a very close in spur ( like << 1 Hz) that really rips up
>your ADEV since it passes through all the cleanup PLL’s ….
Indeed.
That's one of the reason I went with Bo's DDS (32bit0 instead of
the eBay modules (20-24 bit). Higher
Hi
You can indeed do this, the question is - do you *really* want to?
Depending a bit on your GPS module, the 1 pps output can jump around a few
nanoseconds
on a second to second basis. Keeping the 100 MH edge locked implies modulating
the 100 MHz
by at least a few ppb at some rate faster
Hi
One of the things I’ve run into doing Rb’s this way is that the spurs out of
the DDS
are not always the same device to device. They also change a lot with small
tuning
changes. The result can be a very close in spur ( like << 1 Hz) that really
rips up
your ADEV since it passes through all
On Sun, 24 Jun 2018 20:06:17 +0200
Attila Kinali wrote:
> Oops... I just realized that the mixer part number is wrong.
> it should be LTC5599 instead of LTC5598.
Or not... please ignore me.. I seem to be confused.
Attila Kinalie
--
It is upon moral qualities that a
On Sun, 24 Jun 2018 20:00:22 +0200
Attila Kinali wrote:
> Attached is the page of my notebook with the schematic of the idea.
Oops... I just realized that the mixer part number is wrong.
it should be LTC5599 instead of LTC5598.
Attila Kinali
--
It is upon moral
In message , cdel...@juno.com writes:
>I've repaired a few 5065A A1 synthesizer modules recently and lets just
>say that they are not my favorite repair!
None of my two 5065A's have particular good A1's, so I don't know
what the baseline performance should be like.
I have been playing
Does anyone recall off hand the GPS EPOCH startup fix for the DC-XL
I’m away from lab and notes trying to get one running for a friend.
As I recall it was on the order of func 12. F96
But with these units you dont want to be entering random data via keypad
Content by Scott
Typos by Siri
11 matches
Mail list logo
