Hello Community,
thank you all for your hints concerning the HP59309A Clock
and your kind assistance with making available the Operating and
Service Manual.
My HP 59309A had a real problem: One of the input protection diodes
of the EXT FREQ STD input was shot. Suspect the
If no one stepped up yet, let me see what connectors I
have. I know I got LMR-100 but not sure if I have the
connectors, but this will be the excuse I need to run
to the supply house and stock up...
Jamie
--- Jason Rabel [EMAIL PROTECTED] wrote:
I figured I would make the request to you guys
For details of the next run see:
http://pages.suddenlink.net/k5cm/
Connie
K5CM
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I have to show my ignorance here, because this has been bothering me for a
while, and, I wonder if there is a relatively simple answer. This question
has to do with frequency accuracy and stability only. Also, let's talk of
long term like 24 hours or more, so let's ignore phase noise and just
Mike,
I just so happened to be reading through my TS2100 manual and came across a
bit of info that might be applicable to your question:
The info below is for the various oscillator options you can get, and while
the number can vary based on the exact oscillator used (and its age), it
should
In a message dated 4/25/2007 09:50:38 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
So, to
reiterate the question, if I was clear enough, what kind of frequency
excursions should I anticipate to see amongst my three disciplined
oscillators in lets say 24 hours, or in a month. Assume GPS
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
As an aside, how do the Wavecrest machines work? Do they just run the
signal into a low-jitter ADC with a high-quality clock and derive all the
timing information digitally, or is the box full of low-noise tunable
synthesizers, mixers, filters, and the usual stuff?
-- john, KE5FX
Hi Henk,
Hi Mike:
Nice to see you here. This is my take on it, but there are others on this list
that are much more knowledgeable.
The key to the performance of a GPSDO has to do with the Allan plots for the
oscillator, GPS receiver and it's antenna and . . . . Also the Time Interval
counter used
[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
From: John Miles [EMAIL PROTECTED]
Subject: [time-nuts] Wavecrest noise measurement hardware
Date: Wed, 25 Apr 2007 11:43:30 -0700
Message-ID: [EMAIL PROTECTED]
As an aside, how do the Wavecrest machines work? Do they just run the
signal into a low-jitter ADC with a high-quality clock and
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
In a message dated 4/25/2007 11:45:41 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
As an aside, how do the Wavecrest machines work? Do they just run the
signal into a low-jitter ADC with a high-quality clock and derive all the
timing information digitally, or is the box full of
Mike,
If you have three different oscillators that are locked to GPS,
then any difference seen when you read your clock once a day
will be caused by the short term noise. When you take the noise
difference counts as a percentage of counts in a day, the result
is a smaller number than if the
Next week the VLBI community is having another TOW (Technical Operations
Workshop) at the Haystack Observatory NW of Boston. The audience for the
TOW is mainly the technicians at each site who drive the telescopes and
keep the hardware running. VLBI is crucially dependent on timing and
every
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 Tom:
I didn't see in the VLBI slides what was done to tune the delay line, but did
see a hint that there's been a firmware upgrade for it. Can you elaborate?
I like the Cursor Clock on your web page.
Have Fun,
Brooke Clarke
http://www.PRC68.com
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
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
- Original Message -
From: Henk ten Pierick [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Brooke Clarke asked:
I didn't see in the VLBI slides what was done to tune the delay
line, but did see a hint that there's been a firmware upgrade for it.
Can you elaborate?
Rick's latest version uses a delay line with more per-bit precision (now
150 psec steps). We also found that Motorola
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