[time-nuts] Book by William Riley

[Ed Palmer]

I see that William Riley ( author of Stable32) has published a book on 
Rubidium Standards.  Has anyone seen a copy?  Any reviews?


http://www.lulu.com/product/paperback/rubidium-frequency-standard-primer/18171341

I don't have any connection to Mr. Riley or Lulu Marketplace.  Can't 
even afford his software!  :-(


Ed




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Re: [time-nuts] 0MHz distribution...NOT

[Mark Spencer]

Also the effect was not observed when the same gpsdo was fed directly into the 
5370 and the same equipment was power cycled.   Sorry it's been long day 
wrestling with network clocking issues at the office (:

Sent from my iPod

On 2012-03-12, at 7:37 PM, Mark Spencer  wrote:

> The attached file should give you an idea of what I have observed when using 
> daisy chained equipment.
> 
> The horizontal axis of the graph represents seconds (1 reading per second) 
> the vertical access represents the time difference in nano seconds between an 
> OCXO and a GPSDO that is daisy chained with other devices.  The blips are 
> associated with equipment being powered off and on that is daisy chained to 
> the GPSDO.  As a control I also repeated the experiment using another OCXO as 
> a signal source (in lieu of the GPSDO) and did not see the phase jump when 
> the same equipment was power cycled.  The GPSDO is located in another room 
> and fed from another circuit thru a UPS so I'm confident it's not being 
> somehow influenced via power fluctuations by the other equipment being turned 
> off and on.   I made the measurements with an HP5370B which is also powered 
> via a UPS.
> 
> If anyone would like more details or can't view the file please let me know.
> 
> Regards
> Mark Spencer
> 
> 
> --- On Mon, 3/12/12, Bob Bownes  wrote:
> 
>> From: Bob Bownes 
>> Subject: Re: [time-nuts] 0MHz distribution...NOT
>> To: "Discussion of precise time and frequency measurement" 
>> 
>> Received: Monday, March 12, 2012, 5:43 PM
>> What, if any, are the phase changes?
>> 
>> 
>> On Mon, Mar 12, 2012 at 5:39 PM, Chuck Forsberg WA7KGX
>> N2469R
>> wrote:
>> 
>>> 
>>> 
>>> On 03/10/2012 04:44 PM, Mark Spencer wrote:
>>> 
 I've done this as well.
 
 I daisy chained several pieces of hp and marconi
>> gear together that all
 had an approx 1k ohm input impedance for the
>> frequency reference and fed
 them from a single 10 Mhz source via t connectors
>> with a 50 ohm terminator
 at the end of the line.   Looking at
>> the signal with either a scope or a
 time interval counter I have seen noticeable phase
>> shifts when some of the
 equipment receiving this signal is turned off or
>> on.   That being said so
 long as the equipment was not turned off or on the
>> adev of the signal was
 as expected.   Your mileage may
>> vary.
 
 Sent from my iPad
 
 On 2012-03-10, at 4:24 PM, Michael Blazer 
>> wrote:
 
   You may want to take a look at the signal on
>> a scope.  Most instruments
> terminate their reference input.  You
>> might actually have 4 50 ohm loads on
> the Thunderbolt's output and the input voltage
>> might be marginal.  If your
> instruments have both reference input and
>> output, it's better to daisy
> chain the units.
> 
> 
> On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX
>> N2469R wrote:
> 
>> A month or two ago I had sketched out a
>> simple distribution amp
>> for my 10 MHz
>> reference.   In the meantime I became
>> somewhat
>> disillusioned about my FE-5680a
>> standards.   So I removed the
>> FE-5680a and disconnected its power supply
>> from the box that
>> holds the Thunderbolt, power supply, and
>> big line filter.
>> 
>> I decided to try daisy-chaining the
>> Thunderbolt's 10 MHz output.
>> I have plenty of hardware left over from
>> the days of 10BaseT networking.
>> 
>> So I have the Thunderbolt going to a BNC T
>> on the back of my FlexRadio
>> 1500,
>> hence to my Advantest U3641 spectrum
>> analyzer, and finally to the
>> external
>> reference on my Racal-Dana 1992 nanosecond
>> universal counter.  That end
>> has a 50 ohm termination on the other side
>> of its T connector.
>> 
>> All three devices seem happy with the 10
>> MHz they are receiving.
>> 
>>   I connected my Tek 2712 to the end of
>> the chain.  It reads +10dbm
>>> +-1db.
>>> 
>>> Switching units on/off/ext ref causes less than 1db
>> change in the 10 MHz.
>>> 
>>> 
>>> 
>>> --
>>> Chuck Forsberg WA7KGX N2469R c...@omen.com   www.omen.com
>>> Developer of Industrial ZMODEM(Tm) for Embedded
>> Applications
>>>   Omen Technology Inc  "The High
>> Reliability Software"
>>> 10255 NW Old Cornelius Pass Portland OR
>> 97231   503-614-0430
>>> 
>>> 
>>> __**_
>>> time-nuts mailing list -- time-nuts@febo.com
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>>> mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>> 
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Re: [time-nuts] 0MHz distribution...NOT

[Bob Bownes]

What, if any, are the phase changes?


On Mon, Mar 12, 2012 at 5:39 PM, Chuck Forsberg WA7KGX N2469R
wrote:

>
>
> On 03/10/2012 04:44 PM, Mark Spencer wrote:
>
>> I've done this as well.
>>
>> I daisy chained several pieces of hp and marconi gear together that all
>> had an approx 1k ohm input impedance for the frequency reference and fed
>> them from a single 10 Mhz source via t connectors with a 50 ohm terminator
>> at the end of the line.   Looking at the signal with either a scope or a
>> time interval counter I have seen noticeable phase shifts when some of the
>> equipment receiving this signal is turned off or on.   That being said so
>> long as the equipment was not turned off or on the adev of the signal was
>> as expected.   Your mileage may vary.
>>
>> Sent from my iPad
>>
>> On 2012-03-10, at 4:24 PM, Michael Blazer  wrote:
>>
>>  You may want to take a look at the signal on a scope.  Most instruments
>>> terminate their reference input.  You might actually have 4 50 ohm loads on
>>> the Thunderbolt's output and the input voltage might be marginal.  If your
>>> instruments have both reference input and output, it's better to daisy
>>> chain the units.
>>>
>>>
>>> On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote:
>>>
 A month or two ago I had sketched out a simple distribution amp
 for my 10 MHz reference.   In the meantime I became somewhat
 disillusioned about my FE-5680a standards.   So I removed the
 FE-5680a and disconnected its power supply from the box that
 holds the Thunderbolt, power supply, and big line filter.

 I decided to try daisy-chaining the Thunderbolt's 10 MHz output.
 I have plenty of hardware left over from the days of 10BaseT networking.

 So I have the Thunderbolt going to a BNC T on the back of my FlexRadio
 1500,
 hence to my Advantest U3641 spectrum analyzer, and finally to the
 external
 reference on my Racal-Dana 1992 nanosecond universal counter.  That end
 has a 50 ohm termination on the other side of its T connector.

 All three devices seem happy with the 10 MHz they are receiving.

  I connected my Tek 2712 to the end of the chain.  It reads +10dbm
> +-1db.
>
> Switching units on/off/ext ref causes less than 1db change in the 10 MHz.
>
>
>
> --
> Chuck Forsberg WA7KGX N2469R c...@omen.com   www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>  Omen Technology Inc  "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>
>
> __**_
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] 0MHz distribution...NOT

[Chuck Forsberg WA7KGX N2469R]

On 03/10/2012 04:44 PM, Mark Spencer wrote:

I've done this as well.

I daisy chained several pieces of hp and marconi gear together that all had an 
approx 1k ohm input impedance for the frequency reference and fed them from a 
single 10 Mhz source via t connectors with a 50 ohm terminator at the end of 
the line.   Looking at the signal with either a scope or a time interval 
counter I have seen noticeable phase shifts when some of the equipment 
receiving this signal is turned off or on.   That being said so long as the 
equipment was not turned off or on the adev of the signal was as expected.   
Your mileage may vary.

Sent from my iPad

On 2012-03-10, at 4:24 PM, Michael Blazer  wrote:


You may want to take a look at the signal on a scope.  Most instruments 
terminate their reference input.  You might actually have 4 50 ohm loads on the 
Thunderbolt's output and the input voltage might be marginal.  If your 
instruments have both reference input and output, it's better to daisy chain 
the units.


On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote:

A month or two ago I had sketched out a simple distribution amp
for my 10 MHz reference.   In the meantime I became somewhat
disillusioned about my FE-5680a standards.   So I removed the
FE-5680a and disconnected its power supply from the box that
holds the Thunderbolt, power supply, and big line filter.

I decided to try daisy-chaining the Thunderbolt's 10 MHz output.
I have plenty of hardware left over from the days of 10BaseT networking.

So I have the Thunderbolt going to a BNC T on the back of my FlexRadio 1500,
hence to my Advantest U3641 spectrum analyzer, and finally to the external
reference on my Racal-Dana 1992 nanosecond universal counter.  That end
has a 50 ohm termination on the other side of its T connector.

All three devices seem happy with the 10 MHz they are receiving.


I connected my Tek 2712 to the end of the chain.  It reads +10dbm +-1db.

Switching units on/off/ext ref causes less than 1db change in the 10 MHz.


--
Chuck Forsberg WA7KGX N2469R c...@omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
  Omen Technology Inc  "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430


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Re: [time-nuts] Three HP oldies

[Greg Broburg]

Comments

gif is much better than jpg

It is normal to calibrate the print driver so that the
accuracy is very good. If you put a ruler up on a
printed 1 inch line and see that it is significantly
off then the driver needs to be calibrated.

Greg


On 3/12/2012 1:23 PM, Hal Murray wrote:

semif...@comcast.net said:

Or if it is all text, the postscript file system is very good, it allows
control of the entire page formatting in preservation of accurate
alignments.

Postscript also does lines and circles and ...

Usually it gets (much) better results with text than you get from gif/jpg
when they are targeted for screen resolution.



  A laser printer with 600 dpi is a very good graphics machine

Keep in mind that the scale factor may be a bit off.  If you draw a 1 inch
line, it might be slightly more or less than an inch.

It's easy to scale postscript.  My linux system has a psresize command.  (I
haven't tried it, at least not recently.)  With a bit of trial and error, you
can get a very accurate result.

I used to print gerber layers for PCBs on mylar.  If you were doing
mechanical checks, it was worth the effort to get the scale right.  (Maybe we
just had a crappy printer.)

If you like low level hacking, you can write raw postscript by hand for
simple things.  I have the first 3 postscript books from many years ago.  I
pull them out every few years.





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Re: [time-nuts] Three HP oldies

[Pete Lancashire]

Do I know !! I've only been able to convince one Costco that the
equipment they have can take
tiff's and a few other formats. The other is to get them not to crop.
When critical there are other
shops but the price per print is much more. I guess consumer vs
commercial customer
and volume.


On Mon, Mar 12, 2012 at 10:13 AM, David J Taylor
 wrote:
>> Just a note about jpg files, they are intentionally
>> fuzzed as the Japanese Photo Experts Group
>> concept is in the interest of visual art.
>
>
> s/Japanese/Joint/
>
>
>> So if you
>> make a jpg of a schematic much of it will not be
>> readable. Try Graphics Interchange Format gif
>> to preserve computer generated details like lines
>> and text. Or if it is all text, the postscript file system
>> is very good, it allows control of the entire page
>> formatting in preservation of accurate alignments.
>
> []
>>
>> Greg
>
>
> Actually, there is a lossless version of JPEG but it is little used.
>
> PNG is a much better choice for graphics than GIF as it allows more than 256
> colours.  PNG has lossless compression.
>
> Cheers,
> David
> --
> SatSignal software - quality software written to your requirements
> Web:  http://www.satsignal.eu
> Email:  david-tay...@blueyonder.co.uk
>
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Re: [time-nuts] Three HP oldies

[Hal Murray]

semif...@comcast.net said:
> Or if it is all text, the postscript file system is very good, it allows
> control of the entire page formatting in preservation of accurate
> alignments.

Postscript also does lines and circles and ...

Usually it gets (much) better results with text than you get from gif/jpg 
when they are targeted for screen resolution.


>  A laser printer with 600 dpi is a very good graphics machine

Keep in mind that the scale factor may be a bit off.  If you draw a 1 inch 
line, it might be slightly more or less than an inch.

It's easy to scale postscript.  My linux system has a psresize command.  (I 
haven't tried it, at least not recently.)  With a bit of trial and error, you 
can get a very accurate result.

I used to print gerber layers for PCBs on mylar.  If you were doing 
mechanical checks, it was worth the effort to get the scale right.  (Maybe we 
just had a crappy printer.)

If you like low level hacking, you can write raw postscript by hand for 
simple things.  I have the first 3 postscript books from many years ago.  I 
pull them out every few years.


-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] Three HP oldies

[DaveH]

A minor nit...

It's Joint Photographic Experts Group -- not Japanese. Designed
__specifically__ for continuous tone color photographs.  It was never
intended for line drawings and will fail miserably with them.

http://en.wikipedia.org/wiki/JPEG

My local Costco can also handle TIFF files which is a lossless format and
perfect (as well as GIF) for line drawings.

http://en.wikipedia.org/wiki/Tagged_Image_File_Format

You can also buy self-adhesive full-page stickers from your local office
supply store. 
Use your laser to print the panel, apply the label and then overcoat with a
matte spray varnish.

Dave


> -Original Message-
> From: time-nuts-boun...@febo.com 
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Greg Broburg
> Sent: Monday, March 12, 2012 10:08 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Three HP oldies
> 
> Just a note about jpg files, they are intentionally
> fuzzed as the Japanese Photo Experts Group
> concept is in the interest of visual art. So if you
> make a jpg of a schematic much of it will not be
> readable. Try Graphics Interchange Format gif
> to preserve computer generated details like lines
> and text. Or if it is all text, the postscript file system
> is very good, it allows control of the entire page
> formatting in preservation of accurate alignments.
> 
> I have made a similar repair using clear sheets
> made for overhead projectors. My bet is that the
> photographic paper wont buy you very much
> improvement if any. A laser printer with 600 dpi
> is a very good graphics machine. If you want to
> try the mylar paper send me the file and a mail
> address to return to. There is also an option to
> use a material similar to photo paper for laser
> printing, my guess is that that is what the print
> shops are using to make photographic prints
> so they are laser images not photo images made
> from laser images.
> 
> Greg
> 
> On 3/12/2012 11:43 AM, Pete Lancashire wrote:
> > Other then the damage to the 1 rev per second wheel it 
> looks like will
> > not take much to clean up. My corrent idea
> > is to start off with making a replacement on a laser 
> printer and once
> > I'm comfortable with how it looks have a few scales made on
> > photographic paper. One discount retailer here in the US, 
> Costco will
> > do 8x10" prints from .jpg files for $1.50 USD each. Cheap
> > enough to experiment.
> >
> > The 116AR although totally impractical will still be fun to 
> bring back
> > to life, but will be some time. Will need to find a manual
> > first.
> >
> > -pete
> >
> >
> >
> >
> 
> 
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Re: [time-nuts] Possible replacement for FE5680A

[Azelio Boriani]

This is very interesting: I think you have a precision local clock source
to accept a slowly varying input frequency and "clean" it for the
transmission so that it is the clock source that ultimately dominates the
output stability.

On Mon, Mar 12, 2012 at 2:24 PM, Jim Lux  wrote:

> On 3/12/12 2:20 AM, Azelio Boriani wrote:
>
>> Yes, build three and compare them but your comparator has to have a very
>> low noise floor. I think that in addition to building new higher precision
>> clocks you need to build new lower noise TI counters.
>>
>>
> This is part of the thrill (or frustration) of working at the state of the
> art limit.
>
> At work we build state of the art deep space transponders with very low
> added Allan deviation (4E-16 at 1000 sec).  Figuring out a way to prove
> that they work is often harder than designing and building the actual
> article under test, particularly when you want to demonstrate that it will
> do it with a slowly varying input frequency.
>
>
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Re: [time-nuts] Three HP oldies

[Poul-Henning Kamp]

In message <4f5e2d68.4010...@comcast.net>, Greg Broburg writes:

>Just a note about jpg files, they are intentionally
>fuzzed as the Japanese Photo Experts Group
>concept is in the interest of visual art. So if you
>make a jpg of a schematic much of it will not be
>readable. Try Graphics Interchange Format gif
>to preserve computer generated details like lines
>and text.

PNG is also a good choice, both for pictures and
for graphics.


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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Re: [time-nuts] Three HP oldies

[David J Taylor]

Just a note about jpg files, they are intentionally
fuzzed as the Japanese Photo Experts Group
concept is in the interest of visual art.


s/Japanese/Joint/


So if you
make a jpg of a schematic much of it will not be
readable. Try Graphics Interchange Format gif
to preserve computer generated details like lines
and text. Or if it is all text, the postscript file system
is very good, it allows control of the entire page
formatting in preservation of accurate alignments.

[]

Greg


Actually, there is a lossless version of JPEG but it is little used.

PNG is a much better choice for graphics than GIF as it allows more than 
256 colours.  PNG has lossless compression.


Cheers,
David
--
SatSignal software - quality software written to your requirements
Web:  http://www.satsignal.eu
Email:  david-tay...@blueyonder.co.uk 



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Re: [time-nuts] Three HP oldies

[Greg Broburg]

Just a note about jpg files, they are intentionally
fuzzed as the Japanese Photo Experts Group
concept is in the interest of visual art. So if you
make a jpg of a schematic much of it will not be
readable. Try Graphics Interchange Format gif
to preserve computer generated details like lines
and text. Or if it is all text, the postscript file system
is very good, it allows control of the entire page
formatting in preservation of accurate alignments.

I have made a similar repair using clear sheets
made for overhead projectors. My bet is that the
photographic paper wont buy you very much
improvement if any. A laser printer with 600 dpi
is a very good graphics machine. If you want to
try the mylar paper send me the file and a mail
address to return to. There is also an option to
use a material similar to photo paper for laser
printing, my guess is that that is what the print
shops are using to make photographic prints
so they are laser images not photo images made
from laser images.

Greg

On 3/12/2012 11:43 AM, Pete Lancashire wrote:

Other then the damage to the 1 rev per second wheel it looks like will
not take much to clean up. My corrent idea
is to start off with making a replacement on a laser printer and once
I'm comfortable with how it looks have a few scales made on
photographic paper. One discount retailer here in the US, Costco will
do 8x10" prints from .jpg files for $1.50 USD each. Cheap
enough to experiment.

The 116AR although totally impractical will still be fun to bring back
to life, but will be some time. Will need to find a manual
first.

-pete







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Re: [time-nuts] Three HP oldies

[Pete Lancashire]

Other then the damage to the 1 rev per second wheel it looks like will
not take much to clean up. My corrent idea
is to start off with making a replacement on a laser printer and once
I'm comfortable with how it looks have a few scales made on
photographic paper. One discount retailer here in the US, Costco will
do 8x10" prints from .jpg files for $1.50 USD each. Cheap
enough to experiment.

The 116AR although totally impractical will still be fun to bring back
to life, but will be some time. Will need to find a manual
first.

-pete



On Mon, Mar 12, 2012 at 9:20 AM, John Howell  wrote:
> I'll second that Rob!
>
> I have the HP 115BR and, what I believe to be a British version made for the 
> Royal Navy by McMichael. Pictured here:
>
> http://www.flickr.com/photos/75ohm/6829984174/
> and here
> http://www.flickr.com/photos/75ohm/6976111697/
>
> Called a 'Clock Direct Reading' & carrying NSN 6645-99-972-5270 this 
> incredibly well made device requires a 100KHz input which is divided to 1KHz. 
> This powers a Muirhead motor with an armature speed of 10,000 RPM. This is 
> then geared down to drive a mechanical digital readout. The display can be 
> advanced or retarded using a handwheel which operates a differential gear in 
> the drivetrain. There is a 'pips' output which is 100mS of 1KHz every second.
>
> I would be most interested to hear from anyone with information about this 
> device, how and where it was used, circuitry etc.
>
> John Howell (in the UK).
>
>
> On 12 Mar 2012, at 10:36, Rob Kimberley wrote:
>
>> Lovely stuff!!
>> Rob
>>
>> -Original Message-
>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>> Behalf Of Pete Lancashire
>> Sent: 11 March 2012 17:56
>> To: Discussion of precise time and frequency measurement
>> Subject: [time-nuts] Three HP oldies
>>
>> 101A
>> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289
>> 0226481
>>
>> 115CR
>> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245
>> 1866241
>>
>> 116AR
>> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252
>> 1152657
>>
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and follow the instructions there.

Re: [time-nuts] Three HP oldies

[John Howell]

I'll second that Rob!

I have the HP 115BR and, what I believe to be a British version made for the 
Royal Navy by McMichael. Pictured here:

http://www.flickr.com/photos/75ohm/6829984174/ 
and here
http://www.flickr.com/photos/75ohm/6976111697/

Called a 'Clock Direct Reading' & carrying NSN 6645-99-972-5270 this incredibly 
well made device requires a 100KHz input which is divided to 1KHz. This powers 
a Muirhead motor with an armature speed of 10,000 RPM. This is then geared down 
to drive a mechanical digital readout. The display can be advanced or retarded 
using a handwheel which operates a differential gear in the drivetrain. There 
is a 'pips' output which is 100mS of 1KHz every second.

I would be most interested to hear from anyone with information about this 
device, how and where it was used, circuitry etc.

John Howell (in the UK).

 
On 12 Mar 2012, at 10:36, Rob Kimberley wrote:

> Lovely stuff!!
> Rob
> 
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Pete Lancashire
> Sent: 11 March 2012 17:56
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Three HP oldies
> 
> 101A
> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289
> 0226481
> 
> 115CR
> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245
> 1866241
> 
> 116AR
> https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252
> 1152657
> 
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Re: [time-nuts] Possible replacement for FE5680A

[Jim Lux]

On 3/12/12 2:20 AM, Azelio Boriani wrote:

Yes, build three and compare them but your comparator has to have a very
low noise floor. I think that in addition to building new higher precision
clocks you need to build new lower noise TI counters.



This is part of the thrill (or frustration) of working at the state of 
the art limit.


At work we build state of the art deep space transponders with very low 
added Allan deviation (4E-16 at 1000 sec).  Figuring out a way to prove 
that they work is often harder than designing and building the actual 
article under test, particularly when you want to demonstrate that it 
will do it with a slowly varying input frequency.



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Re: [time-nuts] Austron 1201A

[Rob Kimberley]

Hi Joe,

Just found this link:-
http://home.catv.ne.jp/ff/y226/1/1-12/PhaseCompalator/sub1-12-PhaseComparato
r.htm#1201B

1201A & B similar. I think it was only cosmetic changes.

Hope useful.

Rob

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joseph Gray
Sent: 12 March 2012 01:51
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Austron 1201A

Is an Austron 1201A of any use? I may be able to get one. What is a rational
price?

How difficult is it to get an analog output, so I don't have to use the
chart recorder?  I didn't see any output connectors on it.

Any chance of documentation? Googling found nothing.

Joe Gray
W5JG

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Re: [time-nuts] Three HP oldies

[Rob Kimberley]

Lovely stuff!!
Rob

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Pete Lancashire
Sent: 11 March 2012 17:56
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Three HP oldies

101A
https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289
0226481

115CR
https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245
1866241

116AR
https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252
1152657

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Re: [time-nuts] Possible replacement for FE5680A

[Azelio Boriani]

Yes, build three and compare them but your comparator has to have a very
low noise floor. I think that in addition to building new higher precision
clocks you need to build new lower noise TI counters.

On Sun, Mar 11, 2012 at 1:10 AM, Jim Lux  wrote:

> On 3/10/12 2:42 PM, Azelio Boriani wrote:
>
>> Amazing, 10 at -19... will it ever be measurable?
>>
>>
>>  build three and compare them?
>
>
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