Hi.
I'm looking for manual of Brandywine GPS-4 (model:0010-0040).
Does anyone know where to obtain it?
Thanks
Hiro
___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
The VP is still distinctly worse until tau 1000sec.
The plots are not conclusive evidence that correcting for the sawtooth
error isn't advisable.
What about hanging bridges and similar artifacts?
Bruce
It would be interresting to see exactly how much the sawtooth on an
M12 affects actual
Tom Van Baak said the following on 04/21/2007 01:14 AM:
See ADEV of a Hamilton M21 Ship's Chronometer:
http://www.leapsecond.com/pages/m21/
I'm curious -- how did you pull the data?
My first guess would be a microphone to pick up the ticks, followed by a
little dsp...
John
On 4/21/07, John Pettitt [EMAIL PROTECTED] wrote:
I still love
it and occasionally use the circular slide rules to the amazement of
anybody under 45 (my class in the UK was the last high school class to
use slide rules and I had to use a circular one for my pilots license).
I used an E-6B
John Pettitt wrote:
Thomas A. Frank wrote:
My Brietling Navitimer is good for about a second a day when it's clean
- it degrades over time (about 5 years) to about 20 seconds a day then I
pay $$$ to have it cleaned and lubed and it's back at at a second a day
for a couple of years before
On Sat, 21 Apr 2007 08:37:10 -0700, Tom Van Baak
[EMAIL PROTECTED] wrote:
That's how I measured the performance of a WWVB radio
controlled watch:
http://www.leapsecond.com/pages/Junghans/
This is a great example of sawtooth that you probably
haven't seen before.
Hey, that's a nice looking
I recently acquired a surplus Datum/Efratom LPRO-101 Rubidium
oscillator, found a PDF manual from Datum and was wondering if anyone
had any advice or warning on using these oscillators.
I was planning on building a GPS disciplined oscillator using the LPRO
and the 1 PPS out initally from a
Fellow time-clockers,
I have an interesting (if a bit annoying) situation. I would like to
use one of my existing GPS standards to improve stability on one of my HF
transceivers. The problem is that said transceiver, for reasons unknown to me,
uses a 32MHz reference oscillator.
From: Bruce Lane [EMAIL PROTECTED]
Subject: [time-nuts] 10MHz to 32MHz?
Date: Sat, 21 Apr 2007 11:26:23 -0700
Message-ID: [EMAIL PROTECTED]
Fellow time-clockers,
I have an interesting (if a bit annoying) situation. I would like to
use one of my existing GPS standards to improve
The display window of the Thunderbolt monitor software, Tboltmon.exe,
has a section labeled Signal Levels.
There are two column in that section.
The left column is SV, which I understand to be an abbreviation for
Space Vehicle.
The other column is labeled AMU. What does AMU mean?
Thanks.
There are plenty of times when sawtooth removal would be of use/
interest, but in a typical GPSDO which has a heap of other errors, I
do wonder what improvements in performance would actually be seen in
the output from the oscillator - which is all that a lot of people are
really interrested
The display window of the Thunderbolt monitor software, Tboltmon.exe,
has a section labeled Signal Levels.
There are two column in that section.
The left column is SV, which I understand to be an abbreviation for
Space Vehicle.
The other column is labeled AMU. What does AMU mean?
You might look at using a Reflock II
(http://www.tapr.org/kits_reflock_ii) to discipline a 32MHz VCXO from
your 10MHz. Unfortunately, the Clock-Block phase noise is nowhere near
good enough to use for an RF application, so that's not an option. :-(
73,
John
Bruce Lane said the following on
Bruce,
Buy an HP 3586 on eBay (I paid $90 for my HP 3586A with OCXO), lock its
reference to the GPSDO, set it to 32 MHz and use the LO output. All you
need is a sturdy shelf (!!!) and a couple of cables. No soldering iron
required, no PIC programming or anything else :-)
Maybe not the most
Hiro Nakamura? (Just kidding, that name is from a character on the TV show
Heroes here in the US.)
Anyhow, you can get a copy of the GPS4 manual here (GPS4-Manual_v2.2.pdf):
http://www.rabel.org/archives/Brandywine_GPS/
The Brandywine people don't seem to always respond to emails.
What
michael taylor wrote:
I recently acquired a surplus Datum/Efratom LPRO-101 Rubidium
oscillator, found a PDF manual from Datum and was wondering if anyone
had any advice or warning on using these oscillators.
I was planning on building a GPS disciplined oscillator using the LPRO
and the 1 PPS
Hi John:
Is there any data on how the Reflock II does as the basis of a GPSDO compared
to other ones?
Have Fun,
Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
John Ackermann N8UR wrote:
You might look at
Hal Murray wrote:
There are plenty of times when sawtooth removal would be of use/
interest, but in a typical GPSDO which has a heap of other errors, I
do wonder what improvements in performance would actually be seen in
the output from the oscillator - which is all that a lot of people are
There is a firmware image for the Reflock II that will lock a 10 MHz (or
other relatively-low-frequency) oscillator to PPS. The last time I
looked at it, it worked OK but not up to a real GPSDO -- which makes
sense since it's a pretty basic PLL. Luis Cupido has updated the PPS
code since then,
John Ackermann N8UR wrote:
There is a firmware image for the Reflock II that will lock a 10 MHz (or
other relatively-low-frequency) oscillator to PPS. The last time I
looked at it, it worked OK but not up to a real GPSDO -- which makes
sense since it's a pretty basic PLL. Luis Cupido has
Dr Bruce Griffiths said the following on 04/21/2007 06:59 PM:
multiple of the PPS frequency.
Thus while the REFLOCK II is better than nothing its performance will
fall far below a well designed real GPSDO in this application.
It will work much better for locking to higher frequencies where
One solution: double the 10 MHz twice to get 40 MHz, divide by 5 with any
handy 74HC or 74F counter to get 8 MHz, and mix that with the 40 MHz signal
to get 32 MHz and 48 MHz. Basic LC filtering should be adequate in the
10-40 MHz multiplier and the 32 MHz output sections.
Another solution:
Just please tell me they're not serrated, know how to use a steel, and you
keep them holder or leather pouch.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rasputin Novgorod
Sent: Friday, April 20, 2007 8:19 AM
To: Discussion of precise time and
John Miles wrote:
One solution: double the 10 MHz twice to get 40 MHz, divide by 5 with any
handy 74HC or 74F counter to get 8 MHz, and mix that with the 40 MHz signal
to get 32 MHz and 48 MHz. Basic LC filtering should be adequate in the
10-40 MHz multiplier and the 32 MHz output sections.
On 4/21/07, Jack Hudler [EMAIL PROTECTED] wrote:
Just please tell me they're not serrated, know how to use a steel, and you
keep them holder or leather pouch.
My lifepartner Gwennie NG3P was gifted by her mother with a knife set.
They're not serrated, but you don't use a steel on them.
They're
Hi All,
another method that avoids PLL and other sources of phase noise is to
divide down to 2MHz, get a square wave signal,
low pass it to make a rough sine wave, feed it into a full wave
rectifier, (pair of diodes) and the fundamental is eliminated and
only even harmonics are left.
Neville Michie wrote:
Hi All,
another method that avoids PLL and other sources of phase noise is to
divide down to 2MHz, get a square wave signal,
low pass it to make a rough sine wave, feed it into a full wave
rectifier, (pair of diodes) and the fundamental is eliminated and
As I type this, my solenoid actuated mechanical slave clock is being driven
by my GPS receiver. The 1PPS signal drives a two stage divide-by-sixty
counter. The two counter stages, 7490 divide by ten and 7492 divide by
twelve used as a divide by six, are interfaced to two large Nixie tubes to
Brooke Clarke wrote:
Is there any data on how the Reflock II does as the basis of a GPSDO
compared to other ones?
Which other ones?
It is lousy compared to a real GPSDO (e.g. Z3801a). But that's not its
sweet spot, really.
It is perfectly fine hardware for locking a VCO to an HF reference,
As I type this, my solenoid actuated mechanical slave clock is being driven
by my GPS receiver. The 1PPS signal drives a two stage divide-by-sixty
counter. The two counter stages, 7490 divide by ten and 7492 divide by
twelve used as a divide by six, are interfaced to two large Nixie tubes
One has to be careful not to misuse such statistics to mask the
shortcomings of a poorly designed GPSDO.
Bruce, I'm getting the idea you don't like _any_ of the
hobbyists GPSDO's that have come out in the last ten
years...
So I'm curious what then would qualify as a well designed
GPSDO in
check
http://www.ko4bb.com/ham_radio/Manuals/4_GPS_Stuff/GPS4-Manual_v2.2-1.pdf
Didier KO4BB
Hi.
I'm looking for manual of Brandywine GPS-4 (model:0010-0040).
Does anyone know where to obtain it?
Thanks
Hiro
___
time-nuts
Tom Van Baak wrote:
Bruce, I'm getting the idea you don't like _any_ of the
hobbyists GPSDO's that have come out in the last ten
years...
So I'm curious what then would qualify as a well designed
GPSDO in your opinion? (and please don't bring up the
Quartzlock thing; it's a hundred times
Hi Tom:
I've been looking at patents for secondary clocks and find that there's two
class numbers: 368/59 is Horology/Secondary and 968/548 is Horology/stepping
secondary.
Do you know what the difference is between the two top class numbers both
called Horology?
Have Fun,
Brooke Clarke
From: Christopher Hoover [EMAIL PROTECTED]
Subject: Re: [time-nuts] GPS: ADEV or MDEV?
Date: Sat, 21 Apr 2007 20:06:59 -0700
Message-ID: [EMAIL PROTECTED]
Bruce wrote:
6) Doesn't rely on the relative phase of an independent oscillator being
random with respect to the PPS signal or the OCXO
Hmm. ...and I just bought a set of three Chef's knives for my
kitchen for $500.
/b
--- Jack Hudler [EMAIL PROTECTED] wrote:
Just please tell me they're not serrated, know how to use a steel,
and you keep them holder or leather pouch.
Hi Jack:
I love cooking, as a hobby (and surprisingly,
Any one want to help this person?
Bill K7NOM
---BeginMessage---
I have a frequency standard Efratom type MRT,
and I am looking for the Service manual .
Help me !
Thanks
mauri
---End Message---
___
time-nuts mailing list
time-nuts@febo.com
http://bama.sbc.edu/efratom.htm is the first hit on Google. It points to
ftp://bama.sbc.edu/downloads/efratom/frk/Efratom_FRK.pdf
On 4/21/07, Bill Janssen [EMAIL PROTECTED] wrote:
Any one want to help this person?
From: mauri [EMAIL PROTECTED]
To:
Date: Sat, 21 Apr 2007 19:56:42 GMT
I love this list! What we find to talk about.
Until about this time last year when I closed the last one, for 11
years I owned and operated a pair of BBQ steak restaurants and a
catering service. For much of that time I was the chief cook and
bottle washer :-)
Believe it or not I like to cook
Rasputin Novgorod wrote:
Hmm. ...and I just bought a set of three Chef's knives for my
kitchen for $500.
/b
--- Jack Hudler [EMAIL PROTECTED] wrote:
Just please tell me they're not serrated, know how to use a steel,
and you keep them holder or leather pouch.
Hi Jack:
40 matches
Mail list logo
