Oh fudgknockers I could have sworn I saw RB models with the GPS antenna
inputs, but looking at the few pictures I can find, I think you are right.
Please don't burn me at the stake, at least not until after Christmas.
I sincerely apologize, I honestly thought they had the antenna input, but I
David Forbes recently mentioned the Wikipedia item on dual-modulus
prescalers:
http://en.wikipedia.org/wiki/Dual-modulus_prescaler
I have looked at that article, and either my brain has slipped out of
gear, or there are some errors in both the diagram and the words:-( I
think I can see the
Thanks to Bob, the Brandywine GPS-4 manual is at
http://www.ko4bb.com/ham_radio/Manuals/2_GPS_Stuff
Didier KO4BB
Original Message
Subject:RE: [time-nuts] Looking For Brandywine GPS-4 User Manual
Date: Thu, 21 Dec 2006 10:21:42 -0500
From: Robert E. Martinson
Recently there has been some mention of the influence of 1pps sawtooth and
hanging bridges jitter on the performance of a GPSDO.
It would seem to me that the jitter must average to zero in the long run,
for if it did not the 1pps signal would drift away from its relation to UTC.
But the
At 3:46 PM + 12/21/06, Peter Vince wrote:
David Forbes recently mentioned the Wikipedia item on dual-modulus
prescalers:
http://en.wikipedia.org/wiki/Dual-modulus_prescaler
I have looked at that article, and either my brain has slipped out of
gear, or there are some errors in both the
In message [EMAIL PROTECTED], Brooks Shera writes:
Averaging the sawtooth/bridge correction data for several averaging times
produced the following results (2):
Avg TimeStandard Deviation Residual Jitter
none 8.4 nsec +/- 15 nsec
30 sec1.53
To explore this I used TAC32 to record the 1 pps sawtooth
correction message from a Motorola M12+ receiver for
about 1 hour, during which time many bridges occurred (1).
Excel's statistical toolbox was then used to examine
the data.
Brooks,
That's really nice work.
Are you sure, though,
In message [EMAIL PROTECTED], Tom Van Baak writes:
1 second raw samples: 10.40 ns
then removing small linear frequency offset,
1 second samples: 9.36 ns
30 second averages: 9.62 ns
300 second averages: 10.0 ns
Did I do something wrong? PHK, what do you think
about this?
Given what we know, the
Paul is right about the temp sensitivity. I am surprised he managed to
keep the receiver balancing on one foot for seven minutes, but if you
try hard enough, I guess anything is possible.
I thought everyone on this thread might be interested in what is causing
the hanging bridge, so here goes.
Brooks Shera wrote:
Recently there has been some mention of the influence of 1pps sawtooth and
hanging bridges jitter on the performance of a GPSDO.
It would seem to me that the jitter must average to zero in the long run,
for if it did not the 1pps signal would drift away from its relation
In message [EMAIL PROTECTED],
Randy Warner writes:
Those of you who worked with the UT+ receiver may remember a problem
with the time slips in one version of firmware. Motorola updated the
firmware to do some minor housecleaning and accidentally messed up the
100PPS.
It also messed up the 1Hz
Hi Bruce:
How to get a copy?
Have Fun,
Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
/Time Interval Averaging: Theory, Problems, and Solutions/, David Chu,
HP Journal June 1974 pp12-15.
Bruce
Brooke Clarke wrote:
Hi Bruce:
How to get a copy?
Have Fun,
Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
/Time Interval Averaging: Theory, Problems, and Solutions/, David Chu,
HP Journal June
Randy Warner wrote:
Paul is right about the temp sensitivity. I am surprised he managed to
keep the receiver balancing on one foot for seven minutes, but if you
try hard enough, I guess anything is possible.
I thought everyone on this thread might be interested in what is causing
the hanging
http://www.hparchive.com/hp_journals.htm
Didier KO4BB
Brooke Clarke wrote:
Hi Bruce:
How to get a copy?
Have Fun,
Brooke Clarke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
/Time Interval Averaging: Theory,
In message [EMAIL PROTECTED], Dr Bruce Griffiths writes:
If only one had access to the receiver firmware: the cure for hanging
bridges etc is surely to add sufficient (rms noise ~ PPS positioning
quantisation error) bandlimited gaussian noise to calculated PPS
position before quantisation of
I am new to the time list and a novice at disciplined oscillators. I will be
starting the Shera disciplined oscillator project soon. I would love to hear
from each and every one of you as I get started in this endeavor. I prefer
to make a stand alone unit, rather than disciplining my HP5328A.
Bruce,
Absolutely. It could certainly have been fixed, but it was just never
enough of a concern for normal applications.
This design methodolgy also caused insurmountable problems when Motorola
tried to introduce a chipset based upon the Oncore firmware that could
be customized by the customer
YOU have a 10811D that worn out? How did you determine this?
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Cornell
Sent: Thursday, December 21, 2006 4:05 PM
To: time-nuts@febo.com
Subject: [time-nuts] Getting started on Shera project
I am new to the
From: Jack Hudler [EMAIL PROTECTED]
Subject: Re: [time-nuts] Getting started on Shera project
Date: Thu, 21 Dec 2006 17:52:42 -0600
Message-ID: [EMAIL PROTECTED]
YOU have a 10811D that worn out? How did you determine this?
Maybe he meant the HP 5328A counter. :)
Time-nuts only see what they
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