I'd recommend that fiber-optic transmission should be used where it has
definite advantages, such as long distance, for galvanic isolation, or
in serious EMC situations. It's fun to experiment with for all kinds of
things, but it has no advantage over traditional wiring/cable for signal
On 3/21/19 1:19 AM, Gerhard Hoffmann wrote:
BTW our modules for Cisco had special contents in some registers to make
sure
that nobody could use alien modules. There must have happened some
social engineering if I read the post above :-)
I suspect more that someone sued under the Magnuson
Hi
How low is low ? :)
Based on the plot that Bill provides in the write up you linked to, he measured
the insertion phase noise of the unit. His description is (as always) accurate:
“….this level of performance isn’t exceptionally good, it is quite adequate for
its intended purpose …”
=
The "personality" for these modules is stored in a bog standard 3.3V 256 byte
I2C EEPROM (address 0xA0). The I2C bus is n the connector. An Arduino can
reprogram that memory. For the simplest case you just change the vendor ID
info. I think the kilobuck level programmers is just a simple
To pull this back to time nuts territory, this brings up the idea of simply
using traditional ethernet infrastructure, be it 100M/1G/10G/whatever at
the PHY layer to achieve distribution of 1pps. The infrastructure is easily
enough interfaced to, even a simple microprocessor can do it, using
Hi
Good point. We tend to *assume* ADEV-ish concerns when there may
be other parameters that take precedence. You most certainly can mess
up phase noise (and spurs) in a GPSDO.
Bob
> On Mar 21, 2019, at 4:14 AM, Leo Bodnar wrote:
>
> Tobias,
> Have you measured resulting phase noise of the
Hi,
if it is of interest for someone:
I have made my own distribution amplifier for this exact purpose. Since I want
sine waves, not square, I used some OpAmps. Hamilton Technical Services has
published a design for a distributor here
On 3/20/19 11:42 PM, Warren Kumari wrote:
On Thu, Mar 21, 2019 at 7:05 AM Anders Wallin
wrote:
We've tinkered with SFP-to-SMA adapter boards like this:
https://github.com/aewallin/SFP2SMA_2018.03
http://www.anderswallin.net/2018/04/500-mhz-sfp-board-v4/
And if you want a "ready made"
Am 21.03.19 um 07:27 schrieb Hal Murray:
jim...@earthlink.net said:
It seems like you could probably figure out how to interface to these things
and use them to distribute timing signals.
The document is the "SFP MSA". I still have the XFP version somewhere here.
I don't know how well
Tobias,
Have you measured resulting phase noise of the finished unit?
Thanks
Leo
> From: Tobias Pluess
> sure, I believe you since my primary requirement was phase noise. This is
> because I'd like to use the OCXO as reference for my spectrum analyzer and
> also for my HP 8663 signal generator
On Thu, Mar 21, 2019 at 8:00 AM Hal Murray wrote:
>
> jim...@earthlink.net said:
> > It seems like you could probably figure out how to interface to these
> things
> > and use them to distribute timing signals.
>
> There are two big advantages of fibers:
> They work well for long distances.
>
In message <20190321062751.4c65b406...@ip-64-139-1-69.sjc.megapath.net>, Hal
Murray writes:
>I don't know how well they will work for something like a PPS. Somebody
>should try it. The signal pattern is mostly trying to be friendly to the PLL
>that does clock recovery and/or the AGC
On 21/3/19 5:27 pm, Hal Murray wrote:
>
> jim...@earthlink.net said:
>> It seems like you could probably figure out how to interface to these things
>> and use them to distribute timing signals.
>
> There are two big advantages of fibers:
> They work well for long distances.
> No ground
jim...@earthlink.net said:
> It seems like you could probably figure out how to interface to these things
> and use them to distribute timing signals.
There are two big advantages of fibers:
They work well for long distances.
No ground loops.
The target market for those contraptions is
On Thu, Mar 21, 2019 at 7:05 AM Anders Wallin
wrote:
> We've tinkered with SFP-to-SMA adapter boards like this:
> https://github.com/aewallin/SFP2SMA_2018.03
> http://www.anderswallin.net/2018/04/500-mhz-sfp-board-v4/
>
And if you want a "ready made" solution instead of making the board
We've tinkered with SFP-to-SMA adapter boards like this:
https://github.com/aewallin/SFP2SMA_2018.03
http://www.anderswallin.net/2018/04/500-mhz-sfp-board-v4/
although designed for 1 Gbit (1.25 GHz, or 800 ps 'bits') they work down to
10 MHz (and 5 MHz IIRC).
With a decent interface-board and a
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