It's interesting the way this group handles questions. Say
you ask about a manual for this Lucent do-dad, and you get
no answers. Here are some possibilities for no answer:
Others consider you hopelessly incompetent because you did
not find the manual in some obscure corner of the net by
yourself.
Brooke,
DeMaw's January 1990 QST article 'A Tester for Crystal F, Q and R'
is available as part of the online help included with AADE's free
Filter Design software:
http://www.aade.com/filter.htm
Joe
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of
A bunch of new LUCENT RFTG-m-RB listed on ebay. What's the bottom line? Are
they or are they not GPS disiplined?
Stork
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Hear are some articles on the subject worth reading:
Crystal Motional Parameters, A comparison of Measurement Approaches by Jack
R. Smith, K8ZOA, June 11, 2006
http://www.cliftonlaboratories.com/Documents/Crystal%20Motional%20Parameters
.pdf
Lesson Plan where they measured a crystal
http://www.om
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 t
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 tim
Almost all of the HP Journal issues from the 70s and 80s are online at
www.hparchive.com . There may be other copies floating around, but that's
the easiest way to get them.
I just printed a copy of that one out myself when 'restoring' a nice 5345A
last weekend.
-- john, KE5FX
>
> Hi Bruce:
>
Poul-Henning Kamp wrote:
> 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 calc
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
PHK,
That's probably true. The original GT and UT receivers were identical
physically, but they can both be loaded with any version of GT+ or UT+
firmware. The UT+ hardware is slightly different in that Motorola added
a ceramic filter to the front end for better selectivity. As with the
original U
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.
Ther
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 quantisati
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 Aver
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 ha
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,
>>
In message <[EMAIL PROTECTED]>, "
Randy Warner" writes:
>PHK,
>
>Oooh. Did you have the original UT v1.3 firmware in that one? That
>firmware sucked big time.
Roger that.
The interesting thing is that as a result of me jumping on Motorola,
I ended up with what I think is GT hardware with UT+
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
>
>
PHK,
Oooh. Did you have the original UT v1.3 firmware in that one? That
firmware sucked big time.
Randy
_
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf
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 th
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 rela
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.
Al
Thank you David - yes, that is crystal clear now!
> Notice that the output pulse spacing is irregular, which is why you
> can't use this method for dividing a frequency to make another
> frequency. You can only use it to make a precise number of pulses in
> a given period.
Perhaps if you could
Hi Peter:
I think the beginning of the idea goes back to pen plotters where you
may need to draw a line where the end points are not on the grid of
integers of possible pen positions. But the remainder may be off by 8
bits. For more on Bresenham's algorithm see:
http://www.pacificsites.com/~b
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 w
> 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]>, "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
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 bot
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 questio
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 <[EMAI
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
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
Hi Bob,
Any chance you could email me a copy also?
Cheers
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Robert E. Martinson
Sent: 21 December 2006 05:53
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts]
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