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On 2013-01-11 02:48, Bob Camp wrote:
HI
One thing missing from the list was the HP 53181. It's useless as
a timing device and thus didn't get listed. If you are after
frequency only, they occasionally show up for quite a bit less than
the
Hello,
I made a simple measurement using Symmetricon 5120A phase noise
measurement set and a Marconi 2024 signal generator and I don't
understand the results. I measured the phase noise of 10 MHz signal
with 1 Rad phase modulation at 10 kHz, and I got from mesurement peak
at 10 kHz with level
Should the peak level be at 10MHz? Why 10KHz? 10KHz is the delta from the
carrier: 10MHz plus or minus 10KHz. Moreover, 1Hz is 2*pi*Rad, 1Rad should
be 1Hz/(2*pi).
On Mon, Jan 14, 2013 at 11:35 AM, Filip Amator filip.ama...@gmail.comwrote:
Hello,
I made a simple measurement using Symmetricon
I always feel guilty replying to off-topic threads, but this one just got
interesting! At least most mailers make it easy to mute threads, so...
J. L. Trantham wrote:
My goal is to connect a BP Micro BP-1600, parallel port connected Universal
Programmer, to a computer using USB. BP Micro
The manual states that loosing the settings on a 6680 is no big problem ,
but on the 6681 you loose the interpolator calibtation. And it sounds
like that's not a good thing.
I didn't know you had to watch out for Battery on a PM6680/81.
CFO - Tnut-Beginner
Denmark
The battery in the 6680
Nate,
I, too, am hesitant to post an OT issue, and that is the reason I tried to
ask just the bare essentials without clogging up the list with too much
stuff. However, when I want to know something, I like to ask the smartest
people I know, and this has certainly proven that point.
I think you
Remember that any instrument that displays phase noise as ℒ(f) is subject to
the small-angle constraint, and that includes the 5120A and other gear in its
category. Any amount of PM that shows up at -26 dBc/Hz at 10 kHz is
definitely not a small angle effect. See page 40-43 of
I stayed out as well. I didn't want to get into this, but I suspect if
you are using the parallel port, bit banging is how they did it. That
hasn't worked well since win98. Every newer version of Windows made the
ports harder to own, mostly because once there was multitasking, it
became
If the buyer of the Thunderbolt-E (item # 221174961917) is a member of
TimeNuts, or is know to a TimeNut, please contact me, on- or off-list
(as suits one). I'd like to compare notes on operation WRT LH, and
observed phenomenon.
JimT
___
time-nuts
Filip
What exactly are you trying to measure?
A phase-modulated carrier will have an infinite number of sidebands
spaced at the modulating frequency, the amplitude of the sidebands
gradually reducing away from the carrier. The amplitude of the 1st
pair of sidebands (closest to the
Hello,
recently I tried to trim the Racal Dana
1992 04E internal reference, using the
GPS pps as a reference. I'd like to ask
a pair of questions...
- First is about the method.
I'm using the counter TI to measure it's
own OCXO. The GPS is starting the count,
the internal reference 10MHz (on the
Is it manually adjusted right at the oscillator? If so, just opening it
up and sticking a screwdriver in there gives it a thermal shock, and the
adjusted element will have mechanical stress that has to settle out too
- the value can change for a while.
Ed
The Racal Dana 1991/1992 OCXO has a big pair of pan head screws
exposed on the back. One is coarse adjust and one is fine adjust. I
have the TCXO version which also exposes the adjustment on the back so
you do not have to open anything to get to it.
You can see them here:
On Mon, 14 Jan 2013 21:14:23 +0100, Fabio Eboli fabi...@quipo.it
wrote:
Hello,
recently I tried to trim the Racal Dana
1992 04E internal reference, using the
GPS pps as a reference. I'd like to ask
a pair of questions...
- First is about the method.
I'm using the counter TI to measure it's
own
To the group
I really enjoyed the dropbox content. Pretty good pix and can't imagine
dragging that stuff around. That said its good that HP did spinoff TM
otherwise it would be totally gone.
Now look at HP what a mess. Financial mis-engineering.
Regards
Paul
WB8TSL
On Mon, Jan 14, 2013 at 1:03
Ed wrote:
Is it manually adjusted right at the oscillator? If so, just opening
it up and sticking a screwdriver in there gives it a thermal shock,
and the adjusted element will have mechanical stress that has to
settle out too - the value can change for a while.
The 04E standard used in the
I answer here to all, thank Ed David and Charles for your thoughts.
David, LOL, you posted the pic of the exact counter in question.
Not a similar unit, I mean it's exactly *that* 1992 that is being
measured ;)
The pictures on eevblog show the early measurements I made with
the counter. One of
Il 2013-01-15 00:08 Fabio Eboli ha scritto:
Trying to be more clear:
10MHz period error (vs. GPS) changed from -0.8x10^-10 soon after
the trim, to +1x10^-10 after two days (top right).
Top right is change of phase in time, i.e. period error
measured using GPS as reference.
The OCXO period
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