I find it odd that an instrument that probably cost $50,000 when new
did
not have a TCXO as standard, and perhaps an oven as an option.
But I think HP did this sort of thing a lot. Something that would have
cost
very little to add, became an expensive option. In some cases these
expensive
Great articles in the result, though.
I didn't know the whole history of this, even being
in frequency standards at HP for years. I see
there is a picture of Lou Mueller. He was
extremely smart guy to work with. I learned
an immense amount of physics from him.
Rick Karlquist N6RK
On 2014-02-06 15:13, Tom Van Baak wrote:
On ADEV -- I know the source code calls them adev and oadev, but you
should just call it ADEV. No one uses the old back-to-back formula
anymore; the overlapping formula is the default. And then plot using
the all or many tau method I mentioned.
/tvb
I
On 2013-11-08 15:49, gandal...@aol.com wrote:
At 1000 MHz, the highest frequency I can generate right now, I've
measured
the channel 3 input sensitivity as -50dBm with a sinusoidal signal.
Regards
Nigel
GM8PZR
This high sensitivity is probably a bad thing, not a good thing.
It is
On 2013-11-08 17:38, gandal...@aol.com wrote:
What do static and dynamic mean in that context? Is it the same as
DRAM
vs
SRAM? If so, I don't see any obvious way that translates into one
works
The MB510 looks to be a series of flip-flops so presumably would be
classified as a static
On 2013-11-08 18:07, Peter Gottlieb wrote:
Maybe he means fixed vs. automatic gain (or threshold)? Perhaps a
worry about picking up higher frequency noise on a lower frequency but
larger signal you are looking to measure?
Peter
The problem is the opposite. Low frequency noise will wipe
out
On 2013-10-22 21:37, Bob Albert wrote:
If the two frequencies are near one another you can measure the
difference frequency, which may or may not be helpful.
The difference frequency does not work for us, just as the
ratio does not work for us. Thanks.
Rick
On 2013-10-17 08:34, paul swed wrote:
However homebrewing replacements is of interest.
My experience is with the HP power meters. I have a number of working
units. But darned if the meters no probes or cables show up for a few
dollars at fleas. So last fall I built home brew bolometers. By god
The 4815A used P channel FETs which were available 50 years ago
and are now unobtainium.
The 4193A used N channel FETs which were available 10 to 30 years
ago and may even be currently available.
They are DEFINITELY NOT INTERCHANGEABLE.
This is according to ex-HP'er George Standford, who used
Can anyone suggest a low phase noise amplifier covering
something like 10-1000 MHz? Gain should be 10 to 20 dB
and phase noise should be spec'ed at +10 to +13 dBm output.
Both close in and far out phase noise are of interest.
Thanks in advance.
Rick Karlquist
On 2013-08-27 13:35, Florian Teply wrote:
No, HP did not make the long tube Cs standards at NIST (as the NIST
guys always love to point out) and they are very different animals
than the ones you can buy. So, the international definition of the
second has always been safe from manufacturer
I just wanted to mention that the CBT enclosure itself is an approved
shipping container
for cesium. You can ship the CBT inside any random container.
Originally, the CBT's
had to be shipped in some sort of approved crate doe to the cesium hazard.
Rick Karlquist N6RK
On Sat 15/01/11 10:59
On Mon 27/12/10 3:28 PM , Alan Melia alan.me...@btinternet.com sent:
Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16
DIL
filter/isolating transformers ( identified as a 10F434 from YCL) and
the
spec an pin-out was still available on the YCL web site.worth a look
The HP E9183A achieved 1 millidegree over -55 to +85C
in a single oven. The time lag was dealt with by adding
a double integrator to PID.
Rick Karlquist N6RK
On Fri 12/11/10 8:26 AM , Bill Hawkins wrote:
in the heater control loop. Of course, you can't get to a
millidegree from ambient
Yes, E1938A. I was operating on limited sleep when I posted that.
Rick
On Sat 13/11/10 8:35 AM , Magnus Danielson wrote:
On 11/13/2010 04:48 PM, Richard Karlquist wrote:
The HP E9183A achieved 1 millidegree over -55 to +85C
in a single oven. The time lag was dealt with by adding
with, such as the heater supply voltage and the offset
voltage of the first error amplifier.
We are going for stability, not accuracy, right?
Bill Hawkins
P.S. Really good story to wind up the loosing things thread.
-Original Message-
From: Richard Karlquist
Sent: Saturday, November 13, 2010 3:24 PM
FWIW, you will notice that there is a high value resistor shunting
the crystal in the 10811. The reason for this is to drain off DC charge
caused
by cosmic rays hitting the crystal, according to the designers.
Rick Karlquist
N6RK
On Sat 13/11/10 2:48 PM , iov...@inwind.it wrote:
In the
FWIW, you will notice that there is a high value resistor shunting
the crystal in the 10811. The reason for this is to drain off DC charge
caused
by cosmic rays hitting the crystal, according to the designers.
Rick Karlquist
N6RK
On Sat 13/11/10 2:48 PM , iov...@inwind.it wrote:
In the
FWIW, you will notice that there is a high value resistor shunting
the crystal in the 10811. The reason for this is to drain off DC charge
caused
by cosmic rays hitting the crystal, according to the designers.
Rick Karlquist
N6RK
On Sat 13/11/10 2:48 PM , iov...@inwind.it wrote:
In the
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