On 4/13/2015 3:11 AM, John Miles wrote:
A comparator with less open-loop gain was what they needed. Somebody at HP
really liked ECL line receivers, though. Those were very noisy at HF, but this
had little or nothing to do with their bandwidth (see my other post.)
To square up a 10 MHz
On Mon, 13 Apr 2015 13:03:36 +
Alan Ambrose alan.ambr...@anagram.net wrote:
I'm interested in GPSDO disciplining algorithms - presumably the good ones
are really well thought out stochastic control algorithms.
Is it possible to point me to the seminal references / papers / datasheets
Hi
That paper is addressing the task of keeping the cesium standards in the GPS
satellites on frequency. With the exception of a couple Ham designs, most
GPSDO’s
are done commercial. The algorithms used are mostly proprietary. That’s not to
say that they don’t use common control approaches
Bob wrote:
I've always found that building in performance / reliability is a
lot cheaper than testing it in...
And if you are a surplus dealer, letting the customer test it for you
is a lot cheaper than testing it yourself
One of the defective MV89s I received (guaranteed 100% tested
Agreed, no comparison of course. However, I just needed the signal for my
signal generator, a frequency counter and a clock. So I have one output to
spare. Besides, I don't have to worry about my pacemaker
Frank
-Original Message-
From: time-nuts
Rick,
On 04/13/2015 01:48 AM, Richard (Rick) Karlquist wrote:
On 4/12/2015 2:22 PM, Magnus Danielson wrote:
Hi,
The buffer transistors has not AC-bypass of the emitter resistance, so
that the DC current becomes large and thus contributes flicker noise.
The comparator at the bottom isn't
See especially Appendix A here:
http://www.jackson-labs.com/assets/uploads/main/HP_AppNote.pdf
The HP goal was specifically to meet telco 48-hour holdover specs. Others
here have had vastly different concepts of holdover length (sometimes just
seconds!)
Tim N3QE
On Mon, Apr 13, 2015 at 9:03 AM,
On 4/13/2015 12:14 PM, Magnus Danielson wrote:
Oh yes. Some people say that you should not overcomplex things. My
experience is that oversimplifying them can cause a long stretch of
complex problems and complex workarounds making the total solution more
expensive in development, customer
On Mon, 13 Apr 2015 01:16:08 -0400
Charles Steinmetz csteinm...@yandex.com wrote:
The faster the comparator, the greater its analog bandwidth.
Thus there is more total noise to cause jitter. The DC to
daylight comparator is the opposite of the John Dick (JPL)
paper on zero crossing detectors
No, I meant exactly what I said.
When you are removing epoxy potting compound, put it in an oven
set to 140C, and let it cook until up to temperature. The potting
epoxy will become about as soft as pencil eraser rubber. You can
then pick at it, and get pretty big chunks to come off. When the
Hi
I guess it comes down to what you expect from each level of the process. Each
of us
may expect something different. Toss in language barriers and things can get
even more
confused. Watching the commercials on TV can easily lead you to expectations
that may not
be met :)
-
These
Among my group of ham project-building friends, the motto is There is no
problem so big or complicated that it cannot be over-engineered.
On Apr 13, 2015, at 5:03 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 4/13/2015 12:14 PM, Magnus Danielson wrote:
Oh yes. Some
Alan wrote:
I'm interested in GPSDO disciplining algorithms - presumably the
good ones are really well thought out stochastic control algorithms.
There are two regimes a GPSDO must deal with -- normal operation, and holdover.
There is not a whole lot of mystery about normal, locked
Rick wrote:
The faster the comparator, the greater its analog bandwidth.
Thus there is more total noise to cause jitter. The DC to
daylight comparator is the opposite of the John Dick (JPL)
paper on zero crossing detectors in PTTI around 1990. John
teaches that you use the MINIMUM bandwidth
Hi all,
I'm interested in GPSDO disciplining algorithms - presumably the good ones are
really well thought out stochastic control algorithms.
Is it possible to point me to the seminal references / papers / datasheets that
describe typical algorithms and the advantages and disadvantages of the
Hi
I probably should not rule out the MV89’s going through an exceptionally brutal
salvage process. I’m sure there are a range of outfits doing this stuff and
that
some take more care than others. We may just have a lot of 10,000 MV-89’s
that got nuked and now are forever floating around the
Fuzzy page 13 is the 53132-60011, with the extra components not found on the
53132-60016, which is on page 45 and much clearer. It is an LM361M and is on
both boards.
Now that I have the 53132-60011 board, I plan to start with page 45 and
're-draw' a clear page 13.
Joe
-Original
The faster the comparator, the greater its analog bandwidth.
Thus there is more total noise to cause jitter. The DC to
daylight comparator is the opposite of the John Dick (JPL)
paper on zero crossing detectors in PTTI around 1990. John
teaches that you use the MINIMUM bandwidth amplifier to
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