In message <5174699e.9060...@sasktel.net>, Ed Palmer writes:
>I think that Vref is derived from the internal voltage regulator that
>powers the oscillator. Is it possible that any noise will appear on
>both and therefore, they'll cancel each other out? That could even
>reduce power supply sen
In message <7d58cf6b-25de-4e7d-9570-e512a22aa...@email.android.com>, Didier wri
tes:
>What is the bandwidth of the measurement?
Very low.
The measurements show here are made with an RC lowpass filter (5k/1µF)
on the output, but it doesn't change the statistical properties of
the noise at all.
S
What is the bandwidth of the measurement?
It may be some broadband noise that is filtered by the OCXO
Didier KO4BB
Poul-Henning Kamp wrote:
>
>Ok, this surprised me a LOT!
>
>I used my HP3458A to measure the stability of the Vref output from
>an IsoTemp OCXO-107 and the results were anything
Tisha Hays please contact me by L-L.
Regards,
Perrier
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All,
We are moving to a small condo in So CA so I want to shed some equipment.
I have a HP 5350 Microwave Frequency Counter for sale. It measures from 10Hz
to 20 GHz. Sensitivity rated as -40 dBm. It has an acquisition time of 20-60
ms and up to 120 measurements per second.
It is fair looki
I think that Vref is derived from the internal voltage regulator that
powers the oscillator. Is it possible that any noise will appear on
both and therefore, they'll cancel each other out? That could even
reduce power supply sensitivity.
You could test that by measuring ADEV with an EFC pot
An upgrade is out of the question, I use the 486 for radio programming and
replacing it just to see how L-H performs is not in the picture.
T-Bolt Mon does just fine for what I need, so I'll just stick with it.
Thanks for the reply,
73, Dick, W1KSZ
On 4/21/2013 12:14 PM, John Miles wrote:
I
> The OCXO's Vref has 18 microVolt RMS noise
> I used my HP3458A to measure the stability of the Vref output from an
> IsoTemp OCXO-107 and the results were anything but stellar:
Neat. Thanks.
What's the spectrum look like and what's the bandwidth of the filter inside
the OCXO? How much of t
Ok, this surprised me a LOT!
I used my HP3458A to measure the stability of the Vref output from
an IsoTemp OCXO-107 and the results were anything but stellar:
The OCXO's Vref has 18 microVolt RMS noise
For comparison my HP6626A power-supply has 2 microVolt RMS noise.
Obviously, the Vref only h
I can't scan parts of it as it's far too big. Also it takes far, far
longer to scan and examine every page for proper exposure, etc.
I've done this kind of stuff before.
It's much easier for me to make hard copies as I can do QC instantly.
Someone is interested in a copy and I think he will be sc
BTW, a note to Mark Stephens -- thanks for your email on the LH test server
problem. I somehow managed to pull the serial cable out of the port, but
it's back up now. Your ISP is using the SORBS blacklist to block email from
Comcast, the largest US cable ISP, so I couldn't reply directly.
-- joh
On Sun, Apr 21, 2013 at 11:21:33AM -0700, J. Forster wrote:
> As you may know, some time ago, I acquired an all-but-mythical
> APN-9A LORAN-A receiver/Indicator.
> This is not the common APN-9 LORAN-A, but is a hybrid
> (analog/digital) version built for the B-36 bomber.
> Very few were built and
> I guess I'll forgo the "pleasures" of WIN7 and stick with my XP Laptop.
> Maybe some day it will different.
It'll work fine under Window 7 and 8 (I use Windows 7 x64 to develop, while
my LH monitor is an older laptop with Win2K.)
> BTW, I tried a "Beta" version of Lady Heather, when I try to ex
Russ wrote:
The HP 5334B has a 1k Ohm input impedance shunted by <20 pf it
wouldn't hurt to terminate this input
This is pretty typical for reference inputs on test equipment. The
idea is that one 50 ohm source can feed a number of instruments using
nothing but a series of Tee connectors, w
Thanks to everyone who provided input, I thought it might be a worthwhile
topic. The Fluke 6060B I have specs the Reference input at 50 Ohm and
accepts several frequencies, a nice feature. The HP 5334B has a 1k Ohm
input impedance shunted by <20 pf it wouldn't hurt to terminate this input,
and will
As you may know, some time ago, I acquired an all-but-mythical APN-9A
LORAN-A receiver/Indicator.
This is not the common APN-9 LORAN-A, but is a hybrid (analog/digital)
version built for the B-36 bomber. Very few were built and documentation
is just about non-existant.
I have been very generously
Yes. Wine works. But it is no help to this guy who wants to run under Win
8.
On Sun, Apr 21, 2013 at 8:34 AM, Chuck Harris wrote:
> LH will run fine under linux if you use the Wine applications
> interface. Nothing microsoft or VMWare is required at all.
>
> -Chuck Harris
>
>
> Chris Alberts
Claude,
The main loop of a Rubidium oscillator is composed from a Lamp and a light
sensor . The sensor detect the light level and the relative voltage is
present on the external connector of the Rubidium (see the manual of yours).
During the life of the Rubidium, some lamp particles obscure the in
I think the same could be said for using 75 ohm cable. One could run quad
shield rg-6 with BNC connectors in the lab. It will have lass leakage then
even the best rg58. then you can terminate as required. The quad shield
is foil-braid-fiol-braid and is even better then the 100% coverage
conve
Yes. Wine works. But wine is not help to this guy who wants to run under
Win 8.
On Sun, Apr 21, 2013 at 8:34 AM, Chuck Harris wrote:
> LH will run fine under linux if you use the Wine applications
> interface. Nothing microsoft or VMWare is required at all.
>
> -Chuck Harris
>
>
> Chris Albe
On 04/21/2013 08:28 AM, Chris Albertson wrote:
LH will run even under Linux or Macs just fine if you run a Win XP image
inside VMware. I'm pretty sure VMware runs on Win 7 or Win 8.So you can
always continue to use the Old Win XP even on newer and newer computers.
These is a fre version of
LH will run fine under linux if you use the Wine applications
interface. Nothing microsoft or VMWare is required at all.
-Chuck Harris
Chris Albertson wrote:
LH will run even under Linux or Macs just fine if you run a Win XP image
inside VMware. I'm pretty sure VMware runs on Win 7 or Win 8.
LH will run even under Linux or Macs just fine if you run a Win XP image
inside VMware. I'm pretty sure VMware runs on Win 7 or Win 8.So you can
always continue to use the Old Win XP even on newer and newer computers.
These is a fre version of VMware or you can try Oracle's Virtual Box.
Anoth
Hi Dick,
As far as I know this will find the current version of Lady Heather, it
works fine under XP on a P4 using a native serial port and, as per comment
earlier, also under Win7 on a dual core laptop with a USB to serial
converter
http://www.ke5fx.com/heather/readme.htm
I won
I guess I'll forgo the "pleasures" of WIN7 and stick with my XP Laptop.
Maybe some day it will different.
BTW, I tried a "Beta" version of Lady Heather, when I try to expand to
full screen,
the program aborts. This is on a 486 Laptop I have. Is there a working
version somewhere ??
Thanks for
In message <7601e.32c7850c.3ea53...@aol.com>, ewkeh...@aol.com writes:
>What drives the EFC?
A computer implemented PLL controls the DAC which drives the EFC
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD sin
Thanks for your answer.
Actually, I use a 5334B counter locked on a GPS to record the output of the
rubidium 24/7, with gate times of 10s and 100s .
The measurements are constants between 10,000,000.002 and 10,000,000.004 Hz,
the resolution is 1 mHz for 10s and 0.1 mHz for 100s. I have not enou
What drives the EFC?
Bert Kehren
In a message dated 4/21/2013 7:59:23 A.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message , David writes:
>On Sun, 21 Apr 2013 09:20:28 +, "Poul-Henning Kamp"
>How long is the PLL time constant compared to the rate of temperature
>chang
On 4/21/13 5:18 AM, Attila Kinali wrote:
On Sat, 20 Apr 2013 12:52:03 -0700
"Tom Van Baak" wrote:
For the rest of you:
http://www.leapsecond.com/images/gps-pinwheel-1.jpg
http://www.leapsecond.com/images/gps-pinwheel-2.jpg
Thanks a lot...
So the design changed slightly from what Kunysz r
On Sat, 20 Apr 2013 12:52:03 -0700
"Tom Van Baak" wrote:
> For the rest of you:
>
> http://www.leapsecond.com/images/gps-pinwheel-1.jpg
> http://www.leapsecond.com/images/gps-pinwheel-2.jpg
>
Thanks a lot...
So the design changed slightly from what Kunysz reported in whis two
papers [1,2] ba
In message , David writes:
>On Sun, 21 Apr 2013 09:20:28 +, "Poul-Henning Kamp"
>How long is the PLL time constant compared to the rate of temperature
>changes? Maybe I misunderstood the application.
I'm working on driving the EFC input of a double-oven OCXO
--
Poul-Henning Kamp | UN
On Sun, 21 Apr 2013 09:20:28 +, "Poul-Henning Kamp"
wrote:
>In message , David writes:
>>On Sun, 21 Apr 2013 06:41:06 +, "Poul-Henning Kamp"
>
>>>Uhm, you lost me there, "autocalibration feature" ?
>>
>>Sorry, I meant the DAC1220 manual self-calibration feature which
>>corrects for gain a
Hi Dick
I've tried it via a Prolific USB to serial adapter, running as COM4, and
as far as I can tell, the answer is yes---ish:-)
Both TboltMon version 2.60 and Trimble GPS monitor 1.60, seem to be ok
monitoring a Thunderbolt under Win7 Ultimate 32 bit, until Windows pulls its
old trick a
Hi Dave,
On 04/21/2013 10:32 AM, David Kirkby wrote:
On 20 April 2013 20:52, Tom Van Baak wrote:
For the rest of you:
http://www.leapsecond.com/images/gps-pinwheel-1.jpg
http://www.leapsecond.com/images/gps-pinwheel-2.jpg
It's a thing of mysterious beauty. And the GPS World photo saves me f
In message , David writes:
>On Sun, 21 Apr 2013 06:41:06 +, "Poul-Henning Kamp"
>>Uhm, you lost me there, "autocalibration feature" ?
>
>Sorry, I meant the DAC1220 manual self-calibration feature which
>corrects for gain and offset errors.
ahh.
But those are not really important in a PLL con
On 20 April 2013 20:52, Tom Van Baak wrote:
> For the rest of you:
>
> http://www.leapsecond.com/images/gps-pinwheel-1.jpg
> http://www.leapsecond.com/images/gps-pinwheel-2.jpg
>
> It's a thing of mysterious beauty. And the GPS World photo saves me from the
> temptation to break open my own pinw
On Sun, 21 Apr 2013 06:41:06 +, "Poul-Henning Kamp"
wrote:
>In message , David writes:
>
>>The DAC1220 span and offset drift versus temperature on the other hand
>>are 20 to 50 times worse than that of the AD5791 unless you want to
>>spend the $30 difference in price for deglitching so you ca
Hi all ,
normally the external frequency standard input are not 50 OHms , but all
the distribution amplifier have 50 Ohms of standard output impedance. This
because the standard cables used to connect the devices are 50 ohms.
Case one: External Zi input 50 ohm: direct connection with rg58 cable.
C
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