On Apr 25, 2007, at 23:38, Dave Brown wrote:
Henk
Do any of the spurious signals show on the SA with a search antenna
(located in your lab environment)connected instead of the PRS10?
DaveB
No, they are not. I can see spurious if and only if the PRS10 is
powered. When I open the PRS10 and
Henk ten Pierick wrote:
On Apr 25, 2007, at 23:38, Dave Brown wrote:
Henk
Do any of the spurious signals show on the SA with a search antenna
(located in your lab environment)connected instead of the PRS10?
DaveB
No, they are not. I can see spurious if and only if the PRS10 is
In a message dated 4/24/2007 15:14:11 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
It is unclear to me if the spurious is normal or not. The spurious of
my PRS10 is 60dB down the 10MHz so it is strange that you see no
spurious.
Hi Henk,
try running your PRS10 from a Pb
[EMAIL PROTECTED] wrote:
Also, try making the sine wave of the PRS10 into a nice, fast edge rate
square-wave with a Fairchild NC7SZ04 driver inverter for example. The
Wavecrest
units don't work as well with sine waves as with square waves. On the SZ04,
put
a 10nF cap in series to
In a message dated 4/25/2007 11:55:53 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
And on the opposite front, the TSC-5120 isn't very happy with a square
wave input, particularly if harmonics fall within its input range. The
symptom is lots of spurs showing up in the phase noise
Hi,
Thank you all for the frequency plots of the PRS10. It is very
interesting to see these and find the differences.
In the mean time I have restarted my PRS10 and have seen that some
spurious signals are large at start up and reduce after that. I have
attached a screen shot of the hp8590
I'm going to ask a seemingly stupid question, but bear with me:
Are you sure those signals are really present on the output ?
The reason why I ask is that you are in a frequency territory where
EMI is both radiated and conducted so you have to be really careful
with your setup, grounding in
Hi Poul-Henning,
1. It is not a stupid question but a very valid one.
2. I was aware of the EMI possibility and tried ferrites on the
supply and signal wires with no result.
3. I will try batteries but have to find enough of them.
4. On the spectrum analyzer, I checked the amplitude setting
In a message dated 4/25/2007 12:49:47 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
spurious. The spurious seem to be harmonics of the 357MHz
synthesizer, we see the 1st, 2nd, 3rd and 4th harmonic. (The marker
is on the 3rd harmonic). The spurious between 500MHz and 700MHz are
not
In message [EMAIL PROTECTED], Henk ten Pi
erick writes:
2. I was aware of the EMI possibility and tried ferrites on the
supply and signal wires with no result.
If your powersupply is not very high quality, you are almost certain
to create a ground-loop through the power-cords of the
: Thursday, April 26, 2007 8:42 AM
Subject: Re: [time-nuts] retry: PRS10 has spurious frequencies
Hi Poul-Henning,
1. It is not a stupid question but a very valid one.
2. I was aware of the EMI possibility and tried ferrites on the
supply and signal wires with no result.
3. I will try
Hi Said,
Thanks for the picture.
I have inserted a 100MHz lowpass between the PRS10 and the Wavecrest
tot remove the spurious signals.
There is a large difference in phase noise close to the carrier as
calculated by the Wavecrest.
It is unclear to me if the spurious is normal or not. The
Hi Henk:
Here is a spectrum plot from my PRS10. But it's also connected to the SR620 so
I'm not sure where the spurs are coming from.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Henk ten Pierick wrote:
Hi
Brooke Clarke wrote:
Hi Henk:
Here is a spectrum plot from my PRS10. But it's also connected to the
SR620 so I'm not sure where the spurs are coming from.
Have Fun,
Brooke Clarke
Brooke
60Hz spur - mains related?
70Hz spur from internal phase modulation frequency used in PRS10?
Bruce
Brooke Clarke wrote:
Hi:
Sorry. That was a phase plot in the same folder on my computer.
Here's my spectrum plot.
Have Fun,
Brooke
http://www.PRC68.com
http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Brooke
The 15MHz, 25MHz and 35MHz spurs are
On Apr 22, 2007, at 23:47, [EMAIL PROTECTED] wrote:
Hi Henk,
great to hear that you got a Wavecrest DTS-2075!! That machine can
detect
spurs that phase noise measurements are oblivious too. Spurs cause
nasty
deterministic jitter of course.
That DTS2075 is at my employers lab.
That
In a message dated 4/23/2007 10:51:38 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Hi Henk,
The $900 unit on ebay was a DTS2070.
Yes, I have bought that unit for my home lab but it has not yet arrived.
Same OCXO as the DTS2075...
Attached is a PRS-10 phase noise plot I measured
On Apr 23, 2007, at 20:13, [EMAIL PROTECTED] wrote:
Your nice picture shows a -95dBc phase noise at 10Hz.
The SRS spec for PRS10 is -130dBc at 10Hz. Can you explain that
difference of 35dBc?
The X axis is labeled in exponential form by the TSC instrument, it's
actually -95dBc/Hz at 1Hz
In a message dated 4/23/2007 11:27:39 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I will zip and send off list.
Thanks!!
Do you have the Vectron OCXO specs?
No, but someone on this list mentioned some time ago that they sold
these
units to Vectron (Bruce?) and posted some
Hello,
Sorry for the reply, hit the wrong button. But:
The output spectrum of my just bought PRS10 has spurious frequencies
from 580MHz in steps of 10MHz up to 680MHz. The 580MHz and 680MHz
signals just above the noise. The 630MHz amplitude 60dB down the
10MHz. Does anyone know if this a normal
John,
The PRS10 has a phase noise spec of -130dBc at 10Hz distance. The
only way for me to measure this is with a Wavecrest 2075 and the
PRS10 was not a expected. It was not better than my RS SMX. Trying
to find out why I found the spurious which also are seen by the
Wavecrest. I will
In a message dated 4/22/2007 12:55:08 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
John,
The PRS10 has a phase noise spec of -130dBc at 10Hz distance. The
only way for me to measure this is with a Wavecrest 2075 and the
PRS10 was not a expected. It was not better than my RS SMX.
Said
[EMAIL PROTECTED] wrote:
Hi Henk,
I have a expensive 10MHz ultra-low-noise Wenzel oscillator that we bought
some months ago that has similar very nasty noise on it's output.
See the attached HP8563E plot, you can see the worst spur at 280MHz at
-56dBm, which is about
Said
[EMAIL PROTECTED] wrote:
Spurs cause nasty deterministic jitter of course.
Only if the spurs are not harmonics.
Bruce
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In a message dated 4/22/2007 15:55:37 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Causes
Resonance in bypass/filter/coupling network coupled with slight non
linearity in an amplifier or AGC detector diode?
Bruce
Hi Bruce,
yeah sounds probable, I wonder why Wenzel and SRS don't use
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