On Tue, 07 Oct 2014 17:18:19 -0400, S. Jackson via time-nuts wrote:
> Hi Anders,
>
> in the absence of a true phase noise analyzer the next best thing is to
> use
> one of the Agilent 856x analyzers with the phase noise measurement
> software plug-in.
>
Wouldn't a used E4406A do it , they'r
On 10/7/2014 10:02 AM, Jim Lux wrote:
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I'm looking for something to serve as a source that I
can step quickly.
Possibly overkill, but Agilent has a very state of the art
arbitrary waveform generator that i
On Wed, Oct 8, 2014 at 3:52 AM, Hal Murray wrote:
>
> br...@ko4bb.com said:
> > Kratos (www.kratosepd.com) do fast switching synthesiser subsystems
> that
> > can be locked to a reference..
>
> What does "fast switching" mean in the context of a DDS?
>
> What does the spectrum of a DDS look lik
On 10/8/14, 7:21 AM, Bob Camp wrote:
Hi
On Oct 8, 2014, at 3:52 AM, Hal Murray wrote:
br...@ko4bb.com said:
Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that
can be locked to a reference..
What does "fast switching" mean in the context of a DDS?
Not much at all.
Hi
On Oct 8, 2014, at 3:52 AM, Hal Murray wrote:
>
> br...@ko4bb.com said:
>> Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that
>> can be locked to a reference..
>
> What does "fast switching" mean in the context of a DDS?
Not much at all. Your DDS clock will be some
> We've been using/testing an AD9912 eval-kit board. It can take 10MHz input
> and has an internal 66x PLL and VCO for a 660MHz DDS sample-clock (just out
> of spec actually, vco is min 700MHz if I read the datasheet correctly).
...
> Anders
> PS. I could be tempted to join in if someone wants to m
On 10/8/14, 12:52 AM, Hal Murray wrote:
br...@ko4bb.com said:
Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that
can be locked to a reference..
What does "fast switching" mean in the context of a DDS?
How long does it take to load the new phase increment in?
I supp
frequency measurement
Subject: [time-nuts] fast switching quiet synthesizer
Message-ID: <54341cbf.9080...@earthlink.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I&#x
Although the DDS settles rapidly there some filter settling time is required.
These systems are combinations of DDS and direct synthesis with microsecond or
sub microsecond settling.
Bruce.
> On October 8, 2014 at 3:52 AM Hal Murray wrote:
>
>
>
> br...@ko4bb.com said:
> > Kratos (www.kratos
br...@ko4bb.com said:
> Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that
> can be locked to a reference..
What does "fast switching" mean in the context of a DDS?
What does the spectrum of a DDS look like if I switch back and forth between
2 frequencies at 1 KHz? Or
On 10/7/14, 2:26 PM, Poul-Henning Kamp wrote:
In message <20141007200046.02aa9406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu
rray writes:
Timing on Ethernet is as good as RS-232 if you have a point to point link
rather than a huge network full of crappy software.
That is a "truth" w
http://gmcatalog.kratosepd.com/index.cfm?act=prodsforgroup&grp=45
http://ams.aeroflex.com/ASCS/micro-ASCS-prods-synthesizers.cfm
are the relevant webpages
Bruce
> On October 7, 2014 at 11:06 PM "br...@ko4bb.com" wrote:
>
>
> Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that
Kratos (www.kratosepd.com) do fast switching synthesiser subsystems that can
be locked to a reference..
Aeroflex (www.aeroflex.com/ASCS) do 250ns settling time synthesisers.
Bruce
> On October 7, 2014 at 7:52 PM Jim Lux wrote:
>
>
> On 10/7/14, 1:19 PM, Don Latham wrote:
> > I have two "vers
"Jim Lux"
To:
Sent: Wednesday, October 08, 2014 12:36 AM
Subject: Re: [time-nuts] fast switching quiet synthesizer
On 10/7/14, 10:32 AM, Magnus Danielson wrote:
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
On 10/7/14, 4:43 PM, Bob Camp wrote:
Hi
The output spectrum of some DDS’s is pretty rich. You may find that a 1 GHz DDS
can be filtered to operate directly over the 3.1 to 3.4 GHz.
Oh, clever idea.. Yes.. there is substantial harmonic content, and one
could easily arrange to have more. And
On 10/7/14, 1:19 PM, Don Latham wrote:
I have two "versions" of the ADF4351 dds. One is the AD eval board, and the
other the TPI synthesizer
(http://www.rf-consultant.com/calibrated-signal-generator/) at $280 that might
do the job. The latter device performs well. It will be as good as the 4351,
On 10/7/14, 12:43 PM, Anders Wallin wrote:
We've been using/testing an AD9912 eval-kit board. It can take 10MHz input
and has an internal 66x PLL and VCO for a 660MHz DDS sample-clock (just out
of spec actually, vco is min 700MHz if I read the datasheet correctly).
Output looks like so:
http://w
Hi
The output spectrum of some DDS’s is pretty rich. You may find that a 1 GHz DDS
can be filtered to operate directly over the 3.1 to 3.4 GHz.
Bob
On Oct 7, 2014, at 7:36 PM, Jim Lux wrote:
> On 10/7/14, 10:32 AM, Magnus Danielson wrote:
>> You should be able to use DDS test-boards and by t
On 10/7/14, 10:32 AM, Magnus Danielson wrote:
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
The STEL-1173 takes 6 bytes, but writing the last one latches all 6
bytes over to a single 48 bit word. I expect that other DDSes
On 10/7/14, 10:28 AM, Poul-Henning Kamp wrote:
In message <54341cbf.9080...@earthlink.net>, Jim Lux writes:
Maybe some DDS in a box product? That will take my nice clean 10 MHz
reference?
DDS is by far the easiest, but the question is if it is clean
enough.
Yes, probably clean en
(blame me for airing his ID
:-)) )
Alan
G3NYK
- Original Message -
From: "Don Latham"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, October 07, 2014 9:19 PM
Subject: Re: [time-nuts] fast switching quiet synthesizer
I have two "
Jim,
This reminds me of a project I did back in the early1990's. (Hopefully
we have advanced a bit since then.) It used a bunch of quad latches, some
74138's, a UART, and an RS232 converter. It drove a PTS 40. The UART used
the first 4 bits for BCD frequency and the last four bits to address
In message <20141007200046.02aa9406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu
rray writes:
>Timing on Ethernet is as good as RS-232 if you have a point to point link
>rather than a huge network full of crappy software.
That is a "truth" with an almost uncountable number of footnotes..
Hi Anders,
in the absence of a true phase noise analyzer the next best thing is to use
one of the Agilent 856x analyzers with the phase noise measurement
software plug-in.
By chance I had looked at Ebay over the weekend and those two can be had
for around $3500 these days (with an 8561E).
What is your definition of low noise / purity ?
DDS and low noise take some pretty good engineering.
What is the min frequency ?
What is the step size ?
As to PTS's it took me around an hour to make a cable write the C code to
convert to its interface needs. If I had
not lost the documentatio
On Tue, Oct 7, 2014 at 8:32 PM, Magnus Danielson wrote:
>
>
> Some of the modern DDSes can take 10 MHz directly and step it up
> internally before hitting the DDS core, but it may be that you need to
> synthesize a higher clock from the 10 MHz first.
>
We've been using/testing an AD9912 eval-kit
jim...@earthlink.net said:
> I could hook a Prologix on the back of a PTS with GPIB, and hit it over the
> ethernet, but I'm not sure I'd be able to get the steps to occur when I
> want them (ethernet and determinism do not go well together).
Timing on Ethernet is as good as RS-232 if you have
I have two "versions" of the ADF4351 dds. One is the AD eval board, and the
other the TPI synthesizer
(http://www.rf-consultant.com/calibrated-signal-generator/) at $280 that might
do the job. The latter device performs well. It will be as good as the 4351, I
think. It has a programmable attenuator
Hi
Consider that stepping every ms means settling in much less than that. If you
need < 100 us settling, a pair of synthesizers is probably the only way to go.
Use some sort of modulator / switch between them to keep the key clicks from
driving you nuts.
Bob
On Oct 7, 2014, at 1:02 PM, Jim L
ssion of precise time and frequency measurement"
Sent: Tuesday, October 07, 2014 6:02 PM
Subject: [time-nuts] fast switching quiet synthesizer
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I'm looking for something to serve as a source
In message <54341cbf.9080...@earthlink.net>, Jim Lux writes:
>Maybe some DDS in a box product? That will take my nice clean 10 MHz
>reference?
DDS is by far the easiest, but the question is if it is clean
enough.
Some of the HP generators which go cheap-ish in eBay are pretty
agile to
You should be able to use DDS test-boards and by timing your last write,
you should be able to time the frequency jump.
The STEL-1173 takes 6 bytes, but writing the last one latches all 6
bytes over to a single 48 bit word. I expect that other DDSes have the
same distinct transfer-phase if you
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I'm looking for something to serve as a source that I
can step quickly.
I'm looking at stepping every millisecond or so. Right now, I use a
Ardunino type microcontroller driving a serial DAC driving a VCO,
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