On 06/02/18 22:21, Angus via time-nuts wrote:
> On Tue, 6 Feb 2018 14:54:23 -0500, you wrote:
>
>> 3) its designed for continuous outdoor use (connector is well shielded etc)
>
> That's something that has always baffled me - the number of antennas
> which the manufacturers claim are suitable
On 07/02/18 01:16, Bob kb8tq wrote:
>> MSF disciplined oscillator?! I don't trust these receivers to any better
>> than about the 20ms mark, so such a disciplined oscillator would have quite
>> a long integration time!
>
> Once upon a time, that *was* how people did disciplined oscillators. Part
I've just got the Motorola board talking to Heather - and with much more
data on screen:
https://twitter.com/philpem/status/930215452147617793
(Turns out my receiver was an M12+T, not a UT+ -- the UT+ is 5V, this is 3V)
I still have no idea why the SVeeSix-CM3 wouldn't cooperate with Heather
(I
Hi all,
Has anyone managed to get a Trimble SVeeSix (in TSIP mode) talking to
Lady Heather?
I hooked it all up, TSIPChat reported the unit had a position fix, but
Lady Heather is utterly refusing to show any of the graphs.
I was hoping for a satellite position chart with trails so I could get
Hi there,
I'm currently on what some might call a fool's errand: I'm trying to
build a signal generator to simulate the old Securicor Datatrak (later
Datatrak / Siemens / Mix Telematics) LF signal chain.
Bear with me before you laugh ;)
Datatrak was an LF navigation system, originally built by
On 15/01/16 18:41, Gregory Beat wrote:
> David Zoldan contacted me this morning to inform me that their inventory of
> Symmetricom 58532A antennas is quickly disappearing. He thanked the
> time-nuts group for their previous purchases in 2015.
>
> IF you Contact David, at Launch3, and he said
On 06/01/16 22:00, Jochen Frieling wrote:
> First off it looks like they won't even give out the 450 page work, but
> only photocopies of requested articles/pages ("bestellbar / nur Kopie").
That seems to be more or less in line with a lot of reference libraries'
policies. The British Library
On 04/01/16 21:02, Attila Kinali wrote:
> That's weird. The RIN website has an explicit conference proceedings download
> page:
> http://members.rin.org.uk/conferencepapers/conferencepapers.aspx
>
> They list there a special email address confere...@rin.org.uk as contact
> to ask for access. I
Hi,
I'm currently testing a Motorola M12+T receiver for possible use in a
GPS-disciplined 10MHz oscillator. At the moment, I'm using WinOncore12
version 2.1X3 to communicate with it.
Unfortunately this version of WinOncore seems to be unable to decode the
12-channel control messages, which means
Hi all,
Does anyone happen to have a copy of the proceedings of the 2001 Royal
Institute of Navigation Conference, "NAV 01: Location and Navigation"?
I'm looking for a copy of a paper:
Hartinger H, Willson MJ, Cousins N (2001): Augmentation of satellite
positioning with an LF system.
Paper
the
atmospheric level.
73
KJ6UHN
Alex
On 7/6/2014 7:43 PM, Chuck Forsberg WA7KGX wrote:
On 07/06/2014 05:38 PM, Philip Pemberton wrote:
Hi there,
I've noticed a couple of Trimble OCXOs listed on that auction site.
Specifically, model numbers:
- 65256
- 49423
- 34310 C1
They all seem to be 12V
Hi there,
I've noticed a couple of Trimble OCXOs listed on that auction site.
Specifically, model numbers:
- 65256
- 49423
- 34310 C1
They all seem to be 12V, 10MHz, sine-wave units. Does anyone know if
there are any other differences between them? Do any specific ones
perform better
On 24/04/14 23:30, Bob Camp wrote:
There is no difference at all between a 32 pf series crystal and a 32
pf parallel crystal. They both resonate with a 32 pf load and operate
at exactly the same frequency into that load. Your crystals will work
fine with that circuit.
That's good to know.
I was under the impression it was a relatively low phase noise design...
In any case, my 10MHz crystals are parallel-resonant. Are there any
alternative oscillator designs you'd suggest I look into?
Thanks,
Phil.
On 24/04/14 02:38, Bob Camp wrote:
HI
The circuit they show is not very low
On 05/04/14 21:53, Jim wrote:
I finally had to dive into my Racal Dana 1992 counter, after it had
developed several bad switches. I found that through-hole 6x6mm tactile
switches with four leads will fit in the counter pcb holes diagonally. That
is, if you trim off the leads from two
On 26/12/13 21:01, Charles Steinmetz wrote:
Several observations:
The listing is titled and the item is described in the listing text as
an EFRATOM LPRO-101 10Mhz Oscillator, but the item in the photos is an
SLCR-101.
The frequency standard arrived today. It is indeed an SLCR-101.
Lamp
On 26/12/13 09:33, Dr. David Kirkby wrote:
I oringallly thought your offer of $75 was accepted and was going to
say it was a decent buy at $75 given it needs only a single supply.
But then I realised it must be a UK seller, and it was £75 GBP ($123),
which does not seem so attractive given the
Hi guys,
It seems I must have had a bit too much to drink after Christmas dinner,
as I've apparently gone crazy and bought an Efratom SLCR-101 Rubidium
frequency standard:
http://www.ebay.co.uk/itm/400624911534
I suspect this will make a nice companion for my new-to-me (read:
pre-loved)
On 01/01/12 14:06, Pieter-Tjerk de Boer wrote:
I did manage to make a recording of HBG's shutdown this morning.
It was at 07:00:13.2 UTC.
Why precisely then, I don't know...
Frank, what time is it?
'Bout 7AM.
Weren't we supposed to shut down the transmitter around midnight?
.
On 18/12/11 16:44, li...@lazygranch.com wrote:
I did manage to see the
actual GPS signal on the spectrum analyzer with the amplified
antenna. But like I said, I never sniffed an local oscillator
leakage.
I doubt you would -- the level of LO - RF leakage in the mixer should
be pretty minimal,
On 06/06/11 18:40, J. Forster wrote:
IMO, the lesson is that digital scopes do not always accurately depict
what a circuit is doing. Even a $50 analog 'scope would never have this
issue.
Out of idle curiosity, what sampling mode were you using? (ACQUIRE menu
on my TDS2024B).
In SAMPLE mode,
On 06/06/11 18:57, Chuck Forsberg WA7KGX N2469R wrote:
Offhand, I would suspect undersampling or mistriggering
I picked up a Hameg scope with 200 megasamples/sec a few
years ago. It saved quite a bit of time when I was putting
together a parallel interface between Linux and a Tek storage
On 18/04/11 15:55, Chris Albertson wrote:
Or he could have been ignorant and had a fear
of chemicals not knowing what scary sounding things like sodium
chloride is.
Or dihydrogen monoxide?
A high-school student won first prize in his science fair by circulating
a report on the dangers of
On 19/04/11 20:48, Chris Albertson wrote:
The story I like used common terms where they asked people to find
things on a world map and 30% could not locate the Pacific Ocean.
http://www.nationalgeographic.com/geosurvey/highlights.html
Good grief, that's an easy one.
The Atlantic is the big
Hi guys,
Apologies for the off-topic-ness of this message, but I seem to recall
there are a few HP 16500B users hanging out here who don't follow the
hp_agilent_equipment group on Yahoo...
My 16500B has developed a fault. Earlier today, I booted it up and got a
load of random garbage on the
On 18/02/11 21:50, Hal Murray wrote:
My guess is something is broken rather than the chip has been wiped. Have
you checked the chip select or data path?
Seems unlikely. The board hasn't been touched. The chip seems to connect
directly to the bus connector (some weird high-density IDC thing).
On 19/01/11 14:57, Poul-Henning Kamp wrote:
Try a mild acid like citric (lemon-) or citric (vinegar).
Vinegar would be acetic acid, the same stuff that's used in photographic
stop bath (although there are some 'non-smelly' variants based on citric
acid).
/pedantic-comment
--
Phil.
Lux, Jim (337C) wrote:
Now, standing in line for 7 hours at some government office where there is a
cellphone ban, only to be told that you have been standing in the wrong
line: *That* is a waste of time, unless the value of the service is pretty
darn high (e.g. Keeping you out of prison or
Rob Kimberley wrote:
AFIK a lot of the clocks were radio controlled from MSF Rugby (now Anthorn,
Cumbria). You would need to have some sort of automated system to
accommodate daylight savings switchovers in Spring and Autumn. That said, I
would have thought once synchronised, they would tick off
Spotted this on another mailing list -- thought someone might be
interested in the Atomichron...
Replies to the OP, please -- his name is Dave McGuire, email mcguire AT
neurotica DOT com.
begin snip
Subject: rare stuff available
That's really rare, not eBay rare. My employer was
David C. Partridge wrote:
Don't laugh, I bought a can of isoprop and some citrus label remover the
other day, they were delivered with a total of ten sheets of paper with MSDS
information - argh!
Let me guess.. you bought them from CPC?
I bought a few packs of Chipquik and some contact
gandal...@aol.com wrote:
I have now had two identical failures of Schaffner filtered mains sockets
on ex-mil 7150plus DMMs, although I'm not suggesting the ex-mil source is
particularly relevant.
In both cases there has been an internal component failure within the mains
socket that caused
J. Forster wrote:
When considering a battery backup you really have two ways to go:
Battery -- Inverter -- Load
Battery --- Load
The first option is generally easy to implement, but a lot of the battery
capacity goes up as heat in the inverter. As others have pointed out,
inverters are not
Alan Melia wrote:
Did either of you guys find a source of the Schaffner input socket at a
reasonable price (ie less than twice the cost the 7150 sells for on eBay
:-)) ) I have a spares box full of one that only needs a replacement
fiter.iif I cant get the right one I will bodge something
David C. Partridge wrote:
I have a very poor scan of the 7150 Service Manual. 7150+ is somewhat
different.
I was under the impression that the only significant changes were to the
front panel legend and the software in the EPROM...
I have sent an email to Emerson (successors of Solartron
Hal Murray wrote:
I started collecting low cost GPS receivers a year or two ago. I thought I
had some with the SiRF-II chips. Either I can't find them or I didn't
actually get any.
I've been collecting the OEM modules for about the same amount of time. That
said, I haven't got that many --
Hal Murray wrote:
One case was a gross software bug. I think it was triggered by a pending
leap second.
http://www.megapathdsl.net/~hmurray/ntp/leap-gps.gif
Interesting that the three receivers with issues were all SiRF III based. Do
you know what firmware these were running?
How are
Hal Murray wrote:
Interesting that the three receivers with issues were all SiRF III
based. Do you know what firmware these were running?
Nope. If you know the recipe to find out, I'll ask them. :)
I just scanned their NMEA documentation and didn't see any way to get it.
If memory
Just out of idle curiosity, is there any significant difference in 1PPS
accuracy between different GPS modules?
I've got a pair of Trimble SVeeSix CM3 boards (firmware 4.13 if memory serves,
have to be reflashed to change the comm protocol, which can be either TSIP or
NMEA) and an Axiom
Bruce Griffiths wrote:
If you are serious forget the fancy digital or semiconductor
temperature sensors they aren't good enough.
I was intending to use the slow Dallas chips as a calibration reference
(out-of-box they're usually quite accurate) and for testing. Is there
any particular reason
Bruce Griffiths wrote:
When using a crystal in an oven you should use a crystal specified for
oven operation at a specific temperature.
Which is what my crystal is -- a 10MHz oven crystal, specified for a
30pF load capacitance and operation at 50 degrees Celsius.
I'm intending to use the
David C. Partridge wrote:
Stupid question - why build your own OCXO when you can buy a pretty good
Oscilloquartz OCXO from eBay item number 300247357254 for almost a song?
I can think of a couple of reasons:
1) If it breaks, I can rip it open, poke and probe it, figure out what's wrong
and
WB6BNQ wrote:
The first is a series of Application notes from Agilent (old hp test
div) called AN-200. A total of 5 App notes comprise the AN-200 series.
If you go to the following Web page and enter AN-200 at the top of the
page in the search box, you will get a return of all the AN-200
Hi folks,
I've been following the mailing list for a few weeks using Pipermail (the
web-based archive) and I figured now was a good time to jump in (so to speak).
I'm working on a GPS-disciplined oscillator, based on a Trimble SVeeSix GPS
receiver, and a homebrew OCXO. I've got a pair of
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