Re: [time-nuts] Hp5061 Cesium Zeeman adjustment

2017-02-25 Thread paul swed 
Thanks Corby.
Well didn't find the zeeman peaks but using a GPSDO it was very apparent
what the peaks are. Its now set and the real issue is that the base unit
was a option 004 now with a standard tube in it. Changing the C field
resistor moved it into the correct offset range. 300 ohms down to 235 ohms
for a standard tube per the manual.
I did swap the synthesizer module but I do not believe thats actually an
issue.
Regards
Paul
WB8TSL

On Sat, Feb 25, 2017 at 12:32 PM,  wrote:

> Paul,
>
> The Zeeman frequency you use depends on what synthesizer frequency your
> unit is set for.
>
> Either 48.82Khz or 53.53Khz.
>
> See: https://www.febo.com/pipermail/time-nuts/2008-July/032378.html
>
> The Zeeman coil is close to a short. You set the amplitude to the spot
> that gives you the best look at the peaks.
>
> Adjust the C-field to land on the central peak.
>
> Cheers,
>
> Corby
>
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Re: [time-nuts] My TICC came in the mail yesterday

2017-02-25 Thread Orin Eman 
FWIW, here is a quick test I ran on my TICC, assuming the attachment makes
it.

"TICC base" was a Trimble Thunderbolt reference and PPS.

The reference for the other traces was an FE-5680A with an LTE Lite on ChA
and Trimble PPS on ChB.

The GPS antennas are indoors and entirely sub-optimal.  The LTE Lite is in
a Hammond enclosure and using the antenna supplied with the eval kit
sitting on top of a metal file cabinet.

The result seems to be about as expected for the LTE Lite.  The Trimble
typically doesn't track many satellites so I'm not expecting great results.



On Fri, Feb 24, 2017 at 11:58 PM, Andrew Rodland 
wrote:

> On Fri, Feb 24, 2017 at 7:08 PM, John Ackermann N8UR  wrote:
> > Hi Andrew --
> >
> > There seems to be more than a little magic involved in getting sane
> > three-corner measurements.  I've gotten best results when the run is long
> > enough to have many data points per tau, and also that results when
> you're
> > noise limited tend to go imaginary.  Finally, I think things work best
> when
> > the three sources have similar noise processes, e.g., looking at 3x OCXO
> or
> > 3x Rb or whatever.
> >
>
> Thanks. I'm not even complaining here, like I said, this is more
> visibility than I've had in the past, and the TICC is looking pretty
> good. As for more points, that was just the first 9 or so hours of a
> 24-hour run, which is now completed. At the end of that, it's more
> reasonable: http://i.imgur.com/7v3obqy.png — although I'm certainly
> not putting much faith in anything past 1000s. And the non-hat plot:
> http://i.imgur.com/xWTsqCX.png .
>
> Andrew
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[time-nuts] Hp5061 Cesium Zeeman adjustment

2017-02-25 Thread cdelect 
Paul,

The Zeeman frequency you use depends on what synthesizer frequency your
unit is set for.

Either 48.82Khz or 53.53Khz.

See: https://www.febo.com/pipermail/time-nuts/2008-July/032378.html

The Zeeman coil is close to a short. You set the amplitude to the spot
that gives you the best look at the peaks.

Adjust the C-field to land on the central peak.

Cheers,

Corby

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[time-nuts] Hp5061 Cesium Zeeman adjustment

2017-02-25 Thread paul swed 
Working on a 5061 that I can actually see the beam current on. Looking at
the manual it says to inject a frequency and there are several possible in
the 50 KHz range. But it never says the drive level of the signal to use.
Since this was fairly vintage equipment I might assume the coil was driven
heavily.
When I drive the coil at 3 or more dbm. I see the beam current go down.
Is the adjustment done by actually driving the beam current down then
adjusting the frequency for a slight rise?
Or is it as the book says it should just be a rise from the steady state
current?
Just my luck the tek gen I am using has a band switch at 50 KHz splitting
the possible Zeeman frequencies of interest.
Lastly I stumbled into a document on C-field adjustment from HP vol 21_34
must be 1967. It suggests the better Zeeman frequency is something like 38
KHz instead of 53.53KHz. If I use 38 Khz I do see the rise.
Thanks
Paul
WB8TSL
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Re: [time-nuts] HP 5060A training manual

2017-02-25 Thread Artek Manuals 

Frans

We have it ..contact me off list

Dave

manu...@artekmanuals.com


On 2/25/2017 7:13 AM, Electronics and Books via time-nuts wrote:

is there a pdf of

Hewlett Packard 5060A Cesium Beam Frequency Standard Training Manual
02127-2 Feb 1967

Met vriendelijke groeten
Regards
Frans

i...@electronicsandbooks.com
http://ElectronicsAndBooks.com

Discere ne cesses
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--
Dave
manu...@artekmanuals.com
www.ArtekManuals.com


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

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[time-nuts] HP 5060A training manual

2017-02-25 Thread Electronics and Books via time-nuts 
is there a pdf of

Hewlett Packard 5060A Cesium Beam Frequency Standard Training Manual
02127-2 Feb 1967

Met vriendelijke groeten
Regards
Frans

i...@electronicsandbooks.com
http://ElectronicsAndBooks.com

Discere ne cesses
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Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs.PPSdecoding cards

2017-02-25 Thread Peter Monta 
Hi Tom,

> [ USB time transfer ]
>
> It seems to me that if the read path and the write path are different it
breaks down.
>
> ... But turning that into precise time requires some kind of calibration
of the actual code path delays. In other words, it sounds to me like your
method is valid for frequency transfer but not time transfer.

Yes, but I think the same could be said of other I/O mechanisms.  Even a
nominally symmetric physical layer, such as Ethernet, becomes a little
asymmetric once the general-purpose CPU, software, drivers, interrupts are
added in to the Tx and Rx paths.  Same for PCIe, although those paths are
nearly all hardware.

I'm sure USB is somewhat worse than PCIe.  Let me dig up the old code and
try a one-way calibration against a PCIe GPIO signal.  The PCIe write
should get out to the wire in 500 ns or so, and the Teensy (or a TIC) can
measure that against the USB event that comes along later.  Should allow a
reasonable estimate of the fixed delay (better than measuring the
round-trip total USB transaction time at the CPU and dividing by 2).  The
fixed delay will be system-specific, though, requiring a calibration for
each unique hardware platform, unless the USB round-trip time is small
enough to be ignored by the application.

Certainly PCI, or better, a CPU GPIO pin, is vastly preferable to USB; but
USB is very convenient and available.  If USB can be coaxed into good
performance, so much the better.

Cheers,
Peter
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Re: [time-nuts] My TICC came in the mail yesterday

2017-02-25 Thread Andrew Rodland 
On Fri, Feb 24, 2017 at 7:08 PM, John Ackermann N8UR  wrote:
> Hi Andrew --
>
> There seems to be more than a little magic involved in getting sane
> three-corner measurements.  I've gotten best results when the run is long
> enough to have many data points per tau, and also that results when you're
> noise limited tend to go imaginary.  Finally, I think things work best when
> the three sources have similar noise processes, e.g., looking at 3x OCXO or
> 3x Rb or whatever.
>

Thanks. I'm not even complaining here, like I said, this is more
visibility than I've had in the past, and the TICC is looking pretty
good. As for more points, that was just the first 9 or so hours of a
24-hour run, which is now completed. At the end of that, it's more
reasonable: http://i.imgur.com/7v3obqy.png — although I'm certainly
not putting much faith in anything past 1000s. And the non-hat plot:
http://i.imgur.com/xWTsqCX.png .

Andrew
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