Page 27 of the manual indicates the temperature sensor is fixed at 30
deg C. I'm not sure what exactly it means to have a sensor at a fixed
temperature. I could see the setting being fixed, but not the sensor itself.
Temperature Sensor
¨ STARLOC II – Value fixed at 30 oC
__
Opening the case, here is the info:
GPS
Motorola copyright 1996
TM-AB TC-AB
Oscillator
Datum P/N 105766-002
for
Symmetricom
Part Number 107090-001
Starloc II
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Hej Bruce,
On 12/28/2010 03:43 AM, Bruce Griffiths wrote:
Magnus Danielson wrote:
Actually, I ended up feeding a 10 kHz signal into the ARM1 input and
then let the 5 MHz sines hit the Ch1 and Ch2 inputs.
The 5 MHz + 7 dBm sine signal has a limited slew-rate, so this puts
some extra stress on t
Magnus Danielson wrote:
On 12/28/2010 01:37 AM, John Miles wrote:
What GPIB data rate did you actually get for the 10 kHz trace?
When JohnM ran the same test on my 2070C it was closer to
0.74 s instead of 1.0 s. I'm wondering if you found a way to
get your DTS pacing more accurately.
Note th
On 12/28/2010 01:37 AM, John Miles wrote:
What GPIB data rate did you actually get for the 10 kHz trace?
When JohnM ran the same test on my 2070C it was closer to
0.74 s instead of 1.0 s. I'm wondering if you found a way to
get your DTS pacing more accurately.
Note that Magnus is running a ve
> > What GPIB data rate did you actually get for the 10 kHz trace?
> > When JohnM ran the same test on my 2070C it was closer to
> > 0.74 s instead of 1.0 s. I'm wondering if you found a way to
> > get your DTS pacing more accurately.
Note that Magnus is running a very different test -- I was sel
On 12/27/2010 11:49 PM, Bruce Griffiths wrote:
Then add an isolation amplifier with at least 40dB reverse isolation
between each OCXO and the measurement system and repeat.
If the shielding is adequate (and coupling via power supplies or other
stray paths is sufficiently small) any injection lock
In your case the choice of a phase detector with high port to port
isolation probably accounts for your results.
Others have seen injection locking effects with 10811A OCXOs which
vanish when an a buffer amplifier with 40dB of reverse isolation is
added between the OCXO and the measurement syste
Thanks Bruce, your feedback is always helpful and welcomed.
The TPLL is not a cure all for everything. It has it's own set of problems
and trade-offs,
but I have found it to be simple, viable alternative that can achieve good
results with a minimum of parts and cost.
As far as injection locki
Then add an isolation amplifier with at least 40dB reverse isolation
between each OCXO and the measurement system and repeat.
If the shielding is adequate (and coupling via power supplies or other
stray paths is sufficiently small) any injection locking effects should
be significantly reduced.
Hi Magnus,
Another test that's really fun to do is to measure what effect
DUT frequency differences have on stability measurements.
Let me explain. Say you measure the ADEV of DUT1 using
DUT2 as the reference. Theoretically this measurement is
independent of the relative frequency offset between
I'm looking for rack mounting ears for Spectracom WWVB units, like the
8164 or 8170. If anyone has any they can spare, please contact me
off-list. (They're no longer available from Spectracom.)
Thanks!
John
j...@febo.com
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The tight PLL isn't a cure all for injection locking which creates a
frequency offset despite the PLL (see p102 of Wolaver).
If the isolation is inadequate instability in the injection level and
phase shift due to environmental fluctuations will cause a measurable
effect.
The isolation achieved
Others said:
There is a downside to this approach which should be understood, it will
also averaging out the white noise of the DUTs.
The time interval counter method severely undersamples the phase noise
spectrum leading to aliasing effects.
The measured ADEV depends on the associated filter b
Hej Bruce,
On 12/27/2010 08:13 PM, Bruce Griffiths wrote:
Tom Van Baak wrote:
There is a downside to this approach which should be understood, it
will also averaging out the white noise of the DUTs.
Correct. A similar white noise effect can happen if you average
the raw data itself. See the p
Hi Tom,
On 12/27/2010 06:29 PM, Tom Van Baak wrote:
I've used various arming rates to the DTS-2070C from 1 Hz to 10 kHz
and also varied the averaging block size accordingly such that I will
get one reading every second.
That's a very nice plot; textbook perfect. Thanks for posting it.
Thanks
Tom Van Baak wrote:
I've used various arming rates to the DTS-2070C from 1 Hz to 10 kHz
and also varied the averaging block size accordingly such that I will
get one reading every second.
That's a very nice plot; textbook perfect. Thanks for posting it.
What GPIB data rate did you actually ge
Magnus Danielson wrote:
Hi!
On 12/27/2010 06:35 AM, Bruce Griffiths wrote:
Considering that:
1) I've measured the same signals on similar or higher performance
counters and not seen it with those units.
2) The frequency difference is so low that I do not experience a
phase-wrap for the 2476 s
I've used various arming rates to the DTS-2070C from 1 Hz to 10 kHz and
also varied the averaging block size accordingly such that I will get
one reading every second.
That's a very nice plot; textbook perfect. Thanks for posting it.
What GPIB data rate did you actually get for the 10 kHz trac
Hi!
On 12/27/2010 06:35 AM, Bruce Griffiths wrote:
Considering that:
1) I've measured the same signals on similar or higher performance
counters and not seen it with those units.
2) The frequency difference is so low that I do not experience a
phase-wrap for the 2476 s long measurement run.
3
Alma #511 has an interesting trick for phase comparison: two counters, an adder
and a DAC...
http://science.nrao.edu/alma/aboutALMA/Technology/ALMA_Memo_Series/alma511/abs511.shtml
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD
Luciano,
Great they are 10.7 MC IF xformers then.
Thanks
On Mon, Dec 27, 2010 at 11:09 AM, Paramithiotti, Luciano Paolo S <
luciano.paramithio...@hp.com> wrote:
>
> Hi Stan,Alan,
>
> ++
> Could you suggest a part number/source for the T2, T3, T4 10.7 MHz IF
> transformers ?
> +++
Orange is the colour you can see on the top of the transformer see the picture
in the doubler's description. The FM radio use different type of colours to
mark different couplig and Q of the transformers used in.
Luciano IZ5JHJ
Luciano P. S. Paramithiotti
-Original Message-
From: tim
Hi Stan,Alan,
++
Could you suggest a part number/source for the T2, T3, T4 10.7 MHz IF
transformers ?
+
R: I have a little stock at home for my use.
There is a seller http://www.rfmicrowave.it/catalogue.php?lang=ita have the
green type I think is usable. The pa
Luciano,
Thanks. But what is a 0range Coil?
Particular make?
Thanks
On Mon, Dec 27, 2010 at 5:02 AM, Paramithiotti, Luciano Paolo S <
luciano.paramithio...@hp.com> wrote:
> Here you can find a 10MHz LC filer with vna measurements.
>
> http://www.timeok.it/files/10_mhz_bandpass_filter.pdf
>
> Hop
On Mon 27/12/10 3:28 PM , "Alan Melia" alan.me...@btinternet.com sent:
Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16
DIL
filter/isolating transformers ( identified as a 10F434 from YCL) and
the
spec an pin-out was still available on the YCL web site.worth a loo
Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16 DIL
filter/isolating transformers ( identified as a 10F434 from YCL) and the
spec an pin-out was still available on the YCL web site.worth a look for
10MHz distribution??
I am concerned that a narrow 10MHz filter might
Hello Luciano,
Thanks for the info.
The swept performance plots say it all.
Could you suggest a part number/source for the T2, T3, T4 10.7 MHz IF
transformers ?
I hope you and yours are having then very best of this holiday season.
Thanks Stan, W1LE Cape Cod
On 12/27/2010 9:37 AM,
Here you can find a 10MHz LC filer with vna measurements.
http://www.timeok.it/files/5to10doubler.pdf
I hope to help someone.
Luciano IZ5JHJ
Luciano P. S. Paramithiotti
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In a message dated 27/12/2010 11:45:03 GMT Standard Time,
li...@lazygranch.com writes:
I hope there are no top posting rules on the forum.
Here is the manual.
http://www.symmetricom.com/media/files/support/productmanual/man-starloc2.pd
f
I will pull the cover and look for markings on t
I hope there are no top posting rules on the forum.
Here is the manual.
http://www.symmetricom.com/media/files/support/productmanual/man-starloc2.pdf
I will pull the cover and look for markings on the gps later.
-Original Message-
From: gandal...@aol.com
Sender: time-nuts-boun...@feb
In a message dated 27/12/2010 05:11:06 GMT Standard Time,
li...@lazygranch.com writes:
Sorry to bug the list, but I don't see a way to search the archives.
I have a Datum Starloc II. It seems to run under the Thunderbolt Monitor
and Lady Heather, but the oven temperature isn't sensed corr
Here you can find a 10MHz LC filer with vna measurements.
http://www.timeok.it/files/10_mhz_bandpass_filter.pdf
Hope to help someone.
Luciano IZ5JHJ
Luciano P. S. Paramithiotti
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In message <4d180d2e.9080...@rubidium.dyndns.org>, Magnus Danielson writes:
>When measuring a pair of OSA 8600 oscillators with a HP5370B I see an
>oscillating behaviour. It's a stable variation of about 5,5 s.
>I have tried different settings but no luck. I've used the PPS as start
>and as Exte
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