Re: [time-nuts] Fast Rise/Fall Time Pulser

[Andrew E Mileski]

>From its creator's forum posts, it appears to be a high slew rate
comparator, that once "triggered" will pass the next pulse of an
asynchronous 10 MHz square wave clock (2.5 ppm).

The first version used a micro for setting the threshold voltage.  The
micro was removed in the following generation.

It is for generating fast edges for equipment (bandwidth) testing, not for
precision timing.

Feel free to correct me if I'm wrong.  I was disappointed with the limited
information I could dig-up.

~~
Andrew E. Mileski

On Oct 10, 2017 4:02 PM, "Brooke Clarke"  wrote:

> Hi Larry:
>
> How does it work.
> When I was working with microwave semis it was either a tunnel diode or a
> Step Recovery Diode.
>
> --
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
>
>  Original Message 
>
>> There has been discussion recently about generating fast rise/fall time
>> pulses by various means. Here is a link to a Leo Bodnar device that will
>> provide <40 ps rise/fall time, 50% duty cycle, 10 MHz pulses:
>>
>> http://www.leobodnar.com/shop/index.php?main_page=product_in
>> fo&cPath=124&products_id=295
>>
>> This is built on a small PWB with integral BNC connector, powered by 5
>> vdc through a USB B connector; a trigger output is provided. Price is US$68.
>>
>> I've ordered one of these for testing.
>>
>> Is anyone here using one of these?
>>
>>
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Re: [time-nuts] SA22.c and Lady Heather

[Dave Mallery]

hi

machine shop a flake.  retrieving my stuff on monday,

sorry...  now what?

73

dave


On Fri, Sep 8, 2017 at 3:11 PM, Dave Mallery  wrote:

> hi
>
> i got through the smoke to a machine shop today and should have an
> estimate for eight SA22.c sinks shortly.
>
> dave
>
> On Sat, Sep 2, 2017 at 2:48 PM, Dave Mallery 
> wrote:
>
>> hi
>>
>> on the 2011 or newer items, they include this link calibration data plot.
>> 
>>
>> i received a printed one with the unit.
>>
>> dave
>>
>> On Sat, Sep 2, 2017 at 6:55 AM, Mark Sims  wrote:
>>
>>> The data that RDR showed was from the SA22.c "w" command.  I think he
>>> was just using a terminal program.
>>>
>>> Attached is a screen dump of Heather doing a software disciplining
>>> algorithm on a SA22.c (using the dev board as an interface).  The 1PPS
>>> reference that I am using is the nosiest one that I had handy (LEA 5T,
>>> indoor antenna,  second 1PPS output... it has over +/- 66 ns of jitter).
>>>
>>> Heather can also calibrate the SA22 / X72 frequency output.  You apply a
>>> 1PPS input,  enter &a and a sample count (default 1800 seconds).  It then
>>> calculates the drift rate from a linear regression trend line and sets the
>>> device DDS tuning word.  The resolution of the DDS in the device is around
>>> 2.5E-12 / count.
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>>>
>>
>>
>>
>> --
>> Dave Mallery, K5EN (ubuntu linux 16-10)
>> PO Box 15  Ophir,  OR  97464
>>
>>   linux counter #64628 (since 1997)
>>
>>
>>
>>
>
>
> --
> Dave Mallery, K5EN (ubuntu linux 16-10)
> PO Box 15  Ophir,  OR  97464
>
>   linux counter #64628 (since 1997)
>
>
>
>


-- 
Dave Mallery, K5EN (ubuntu linux 16-10)
PO Box 15  Ophir,  OR  97464

  linux counter #64628 (since 1997)
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[time-nuts] The "atomic second" turns 50

[Martin Burnicki]

The "atomic second" turns 50
https://idw-online.de/de/news682346
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