Folks, I have received the following notice. I hope it is of some use.
_
Dates: 3 - 17 Oct 11.
Times: 0700Z 3 Oct 11 to 2000Z 17 Oct 11.
Location: The jamming events will take place throughout the UK FIR/UIR
north of 51
On 07/12/11 02:15 AM, Tim Tuck wrote:
Hi all,
Just wondering how many people have used John Miles work @
http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium
oscillator and if so...
1. what was the RB of choice ?
2.have any measurements of phase noise etc. been published on
Hi David,
Just to clear the AIR, all Rubidium frequency standards have a crystal
oscillator as
the primary signal source within the Rubidium device. The Rubidium portion of
the
standard is just a very high Q filter whose properties can be controlled such
that
it's filter's center frequency
Here's an app note from NASA on what they did for controlling, or
filtering, phase noise, and it can get complicated.
http://ipnpr.jpl.nasa.gov/progress_report2/XII/XIIK.PDF
Best,
Will
*** REPLY SEPARATOR ***
On 7/12/2011 at 1:44 AM WB6BNQ wrote:
Hi David,
Just to clear the
Hi
Any time you get into something like this, there are a lot of qualifiers on
everything. That makes for a number of special cases. Ignoring them and
looking at the most likely:
1) Your typical modular Rb will beat your typical good OCXO past a few
hundred seconds on short term stability.
2)
May I please use this forum to advertise Instrument Control (iC), which is
an open source Java program to control test equipment via GPIB. It is, so to
speak, the poor man's version of LabView (but enough to do my research).
iC processes as list of script commands which define the action in clear
Soubnds good if you have a computer GPIB interface. I don't. Which
is the best one at a reasonable price?
On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich
kurt.pernst...@gmail.com wrote:
May I please use this forum to advertise Instrument Control (iC), which is
an open source Java program to
Be careful. There are at least 6 different ones. All incompatible.
-John
=
Soubnds good if you have a computer GPIB interface. I don't. Which
is the best one at a reasonable price?
On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich
kurt.pernst...@gmail.com wrote:
May I
I also like the USB-GPIB adapters, as you can easily have separate
buses or connect directly to one instrument without GPIB cables (use up to
15ft of cheap USB cables instead), but they are still not cheap or abundant
at eBay.
-Original Message-
From: time-nuts-boun...@febo.com
On Tue, Jul 12, 2011 at 2:01 PM, Jose Camara camar...@quantacorp.com wrote:
I also like the USB-GPIB adapters, as you can easily have separate
buses or connect directly to one instrument without GPIB cables (use up to
15ft of cheap USB cables instead), but they are still not cheap or
Not only PCI is becoming extinct, but GPIB is also fading off as
newer equipment interfaces via USB or Ethernet directly.
Still, legacy equipment with another 40 yrs of service in our
garages will keep those DOS computers, PCI, GPIB, RS-232 alive...
-Original Message-
Once a mobo fails, good luck keeping it alive. The Chinese cap failure
might only cover a few years of design, but who knows. I have two dead
socket 939 boards due to blown capacitors. I've been using the pieces to
upgrade working socket 939 boards.
I've managed to run 16bit dos code in
http://prologix.biz/gpib-ethernet-controller.html
If these guys are really serious about this, I would concentrate on this
dongle. Ethernet boxes are way easier to run on multiple platforms, and
java is multi-platform. Ethernet doesn't need drivers.
You could also run your lab instruments
http://prologix.biz/gpib-ethernet-controller.html
...
Ethernet doesn't need drivers.
The USB version is as close to not needing drivers as you can get. It uses
one of the USB to RS-232 chips that is well supported. Any modern system
will already have the driver.
Power via USB saves a wall
There is no cycle glitch here, but the frequency changed enough to attract my
attention.
http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-g11.png
The system I'm collecting data on has good but not great time. It's running
ntpd, but getting time over the a DSL link rather than from a
I prefer the National Instruments GPIB-USB-HS card and I have lot's of (good)
experience with it, although for personal use it might be too pricy. The PCI
versions also worked fine for me but are less flexible than the USB version.
The Agilent 82357B USB/GPIB interface should be equivalent,
FYI everyone...
73,
Don
W4WJ
_Click here: HP/Symmetricom 58503B GPS Time and Frequency Receiver | eBay_
(http://cgi.ebay.com/HP-Symmetricom-58503B-GPS-Time-and-Frequency-Receiver-/
250853948879?pt=LH_DefaultDomain_0hash=item3a680f7dcf)
___
Looking for recommendations for a broadband synthesizer with external reference
connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh
yeah under $1000 or so. I found a real nice one from holzworth but it is about
$5k which is a bit rich for me. I have seen. Various hp
Bill,
Believe it or not, the HP 8640B is one of the cleanest, as far as signal
goes, that you can get, and you can get an option that will take it to 1
GHz, if I remember. You can pick these up pretty cheap, but they have a
problem with some plastic gears going out on the tuning assembly. These
The 8640A is not a synthesizer. It's a phase locked oscillator. There are
guys making repro gears.
-John
===
Bill,
Believe it or not, the HP 8640B is one of the cleanest, as far as signal
goes, that you can get, and you can get an option that will take it to 1
GHz, if I remember.
Oops. Must remember to engage brain. It's not phase locked. It's counter
locked.
Sorry,
-John
==
Bill,
Believe it or not, the HP 8640B is one of the cleanest, as far as signal
goes, that you can get, and you can get an option that will take it to 1
GHz, if I remember. You can
Bill,
I hate to tell you, but your expectations are completely unreasonable. Of
course you have not told us what it is that you are trying to accomplish. As
you stated you are not into electronics, I suspect you are not understanding
the needed requirements of project you are trying to deal
You might be able to get something close to your specs with some older
gear, like an HP 8660A w/ the correct PI or the AILtech 380 w/ a 2 GHz PI.
They won't do millihertz.
But note that either of those two are heavy, complex, and may require a
lot of effort to get properly working. They were both
If you don't mind cranking the tuning knob for the cavity tuner, the 8640B
is a good RF generator, not a synthesizer, which I also have one. The
synthesizer I have, which you still crank or spin the knob, which in turn
turns a digital encoder, is a Racal Dana 9028P, and I enjoy it over it's
Sorry, I got this backwards.
The one I mentioned is a Racal 9082P, not 9028. It will only go to about
520 MHz, and so will the Boonton.
Best,
Will
*** REPLY SEPARATOR ***
On 7/12/2011 at 9:41 PM Will Matney wrote:
If you don't mind cranking the tuning knob for the cavity
Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned in 1
hz increments but should be dead on. I can feed the passband into speclab via
VAC and measure a carrier OTA. No problem there...can get decent resolution
but there is some uncertainty with regard to the dds
A guy is offering a complete set item # 320727122967 on eBay. I already have
one complete set and lots of duplicates, otherwise I would jump at it. I
like the hard copy a lot better than trying to read them on-line. Regards -
Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
Someone in thread said it once and I will repeat.
What are you trying to do?
From a millihertz to a Ghz is one heck of a range with milihertz res to boot
for under $1K.
Thats a cross between an old HP 3335 and a 8660 series with decreasing
resolution on increasing frequency.
If there is such a
Thats very helpful
If you can get away with 10kc to 80 MC an HP 3335 will do millihertz res.
Also can set the level in 100th db increments. Very nice for injecting.
Price is very reasonable and can be locked to an external ref. Thats the way
I use mine.
I have picked mine up from $35-75. But that
Boy I like hard copy also but afraid an asking price of $900 for the set
isn't in this years budget.
But some lucky person will snap them up.
Nice to see what a set would have looked like.
I have stumbled across a few of them and picked them up for $5 or so.
Sometimes I just let them go.They were
Y'know, as an MIT grad I once coveted that series.
But now that I am 93, I don't give a damn, you see.
(Harry Belafonte, on sex education) (actually, I'm 73)
So there's $900 that won't be leaving my wallet and aiding
the economy by circulating.
What does this have to do with time, you ask?
Bill Hawkins wrote:
What does this have to do with time, you ask? Why, only that
the passage of time alters men's passions.
Yeah, I've had dates like that.
H
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On 7/12/11 1:01 PM, Chris Albertson wrote:
Soubnds good if you have a computer GPIB interface. I don't. Which
is the best one at a reasonable price?
I use the prologix ones (Ethernet flavor)..
Brand new, there's several makes to choose from.. last I checked,
they're in the $100-200 range.
On 7/12/11 5:41 PM, Bill Dailey wrote:
Looking for recommendations for a broadband synthesizer with external
reference connection, at least 1mhz to 1ghz with micro to millihertz
resolution. Oh yeah under $1000 or so. I found a real nice one
from holzworth but it is about $5k which is a bit
Bill,
A generator like the HP 8640B would be tunable like you want, since it's a
continuous mechanically tuned cavity. However, to get into reading
millihertz, you would need an accraute counter to measure the output of the
generator. The problem is, most counters are 8 digits in resolution, and
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