On 06/24/2010 04:48 AM, Robert Benward wrote:
Has anyone ever put another GPS in a Z3801A? Will the software accommodate
another GPS that tracks say, 12 channels?
I very much doubt that the software would handle more than 6 channels
properly. Also, wasn't there a shift in commands when
Bob,
actually this is not a bug but a wanted feature. I you want to start with a
clear (or partially cleared) data set then rename or delete some or all of
the data files that are kept in the same directory as Z38XX itself is in.
Note that the later versions store their data in files that hold
Dick,
On 24 June 2010 11:26, Dick Moore rich...@hughes.net wrote:
@ Steve Rooke -- Warren and I have had correspondence in the past about
other things, and I was very interested in his TPLL implementation. Someone
in the thread had asked Warren if he would supply a schematic diagram of his
At 10:48 PM 6/23/2010, Robert Benward wrote...
Has anyone ever put another GPS in a Z3801A? Will the software
accommodate
another GPS that tracks say, 12 channels?
Possibly 8 channels. You must use a Motorola Oncore VP. A 6 channel one
was what HP used. There are mixed reports on using an 8
Steve Rooke wrote:
I think the reluctance to publish at
component level is the concern that it will be set upon by a bunch of
rabid dogs each saying pointing out errors in the design or
suggestions of how it could be done much better.
A guy has to decide who his audience is.
If you are
Ulrich,
Thanks for the info, I didn't think it was a bug, I just wasnt' sure if I
was able to delete and start over. I knew I could wait 10 days (14400
minutes), I just didn't think that was the only way. I just powered up the
Z3801A and now that it's learned for a few days, I wan't to see
Mike,
Thanks for the info!.Does anyone know for sure if the timimg improves
with more satellites tracked? I don't know how they derive the 1PPS, is it
a blend or one satellite at a time? Maybe I will leave well enough alone.
Bob
- Original Message -
From: Mike S
What is time-nuts recommendation for a good maybe bets GPS receiver with
most accurate 1 PPS output?
Thanks Bert Kehren Miami
In a message dated 6/24/2010 10:00:17 A.M. Eastern Daylight Time,
rbenw...@verizon.net writes:
Ulrich,
Thanks for the info, I didn't think it was a bug, I just
Hi Mike,
At 10:48 PM 6/23/2010, Robert Benward wrote...
Has anyone ever put another GPS in a Z3801A? Will the software
accommodate
another GPS that tracks say, 12 channels?
Possibly 8 channels. You must use a Motorola Oncore VP. A 6 channel one
was what HP used. There are mixed reports on
Sorry to butt in on this thread but, although you need a number of
birds to get an accurate position, you really only need one to get
timing. If you have a six sat tracking receiver there should be enough
to give accurate time. You can always set the elevation to limit what
sats you can see so to
So there is no point in substituting another GPS RX? What is the sawtooth
compensation is see mentioned? What about the antenna cable length
compensation? How much does that affect the AVAR?
Bob
- Original Message -
From: Steve Rooke sar10...@gmail.com
To: Discussion of precise
I now have *two* Z3801A units which misbehave in the following way
(which this thread reminded me of):
The GPS status says it acquires quite a few (5-6) satellites with high
signal strength... then after a minute or two, for no apparent reason,
it loses *all* of them simultaneously but
Hi Bob,
Old GPS receivers had bad resolution with regard to when they could flipp
the 1PPS signal. Think along these lines... you have a digital system,
clock running at say 10MHz. You can only invoke the 1PPS at a clock edge,
this gives you 100ns resolution. The receiver then needs to calculate
When you say you changed location, are we speaking of moving the antenna to
the other side of the roof, or across town? Sounds suspciously like
interference.
Bob
- Original Message -
From: Matthew Kaufman matt...@matthew.at
To: Discussion of precise time and frequency measurement
Thanks for the info and the links!
Bob
- Original Message -
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, June 24, 2010 12:02 PM
Subject: Re: [time-nuts] Substitute GPS in a Z3801A
Hi Bob,
Old GPS receivers
Excellent explanation. Is it possible the phase shift is caused by the
doppler of the satellite? And the instantaneous change of the ramp slope
(on boundries) caused by the receiver changing the PPS tracking from one
satellite to another? As the satellite passes overhead the spacing of the
40 miles, from a high level comm site to/from my house at a very RF-
quiet elevated location. Interference is very unlikely.
Matthew Kaufman
(Sent from my iPhone)
On Jun 24, 2010, at 9:08 AM, Robert Benward rbenw...@verizon.net
wrote:
When you say you changed location, are we speaking of
Hi, my name is Don. I have been lurking on this list for a while, so here is
my first post.
I am a hobbyist who has just built my second home-made quartz digital clock.
Both are based on a microcontroller that counts timer interrupts and uses
software tricks to allow me to tune the clock
Hi -- I've added four pieces to my clearance sale at
www.moorepage.net/Testequip.html
Best,
Dick Moore
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rbenw...@verizon.net said:
What about the antenna cable length compensation? How much does that
affect the AVAR?
The software in the GPS board can't measure the length of the antenna cable.
If you don't correct for it, the PPS signal will be off by the speed of light
delay. That's (very)
Is it possible the phase shift is caused by the doppler of the satellite?
Not likely. Everything in this area is explained by the GPS receiver having
a local crystal that isn't locked to a reference.
See Tom's heater experiment:
http://www.leapsecond.com/pages/vp/heater.htm
--
These
Hi
If you have a *really bad* crystal, it will follow a very nice log aging cure.
A good crystal is much less predictable. The reason is fairly simple, the bad
crystal has a single dominant cause for it's aging. It missed a step somewhere
along the line and it's got a problem. A precision part
On 25 June 2010 01:44, ch...@yipyap.com ch...@yipyap.com wrote:
Steve Rooke wrote:
I think the reluctance to publish at
component level is the concern that it will be set upon by a bunch of
rabid dogs each saying pointing out errors in the design or
suggestions of how it could be done much
check this paper:
http://www.mti-milliren.com/MTIPapers/Ext_Aging_Perf_Results.pdf
stanley
- Original Message
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, June 24, 2010 10:26:42 PM
Subject: Re: [time-nuts] Is
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