of Belden
9104 coax terminated with a BNC. Plus the hardware and stub mast to fix
it to a vent pipe or similar. I don't know what system this antenna was
designed for but the 5-12V spec is interesting.
Dan - ac6ao
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I would be quite interested in the results of this test from something
like a Ublox 6T or 8 unit.
Please keep us posted.
Dan
On 6/5/2018 2:35 PM, time-nuts-requ...@febo.com wrote:
The next thing I want to try is a receiver self-survey vs the post
processed results... I may be able
Board is spoken for, thanks,
Dan
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scrap dealers.
Dan
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it
stuck out really well in the graph. A software check in the GPSDO looks
for this and fixes it. Seemed like it happened about once a week to once
a month type timeframe.
Have you noticed this in your hardware?
Dan
On 5/21/2018 3:21 PM, time-nuts-requ...@febo.com wrote:
Message: 10
Date: Mon, 21
dB?), like the one I have up on my roof. There should be a part
number under the rubber gasket if you want to ask the seller to have a look.
Dan
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references to its use in a timing distribution system but
haven't found service information that would allow component level repair.
Does anyone have, or know of a source for, technical information on this
unit?
Thanks!
Cheers,
Dan
---
This email has been checked for viruses by Avast
needed, as I just discovered, since 2001.
Dan
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of big
Astron supplies under my bench. I had some in my "junk box" that even
had the mounting holes in the correct places. If anyone needs it I can
take photographs of the back of my 9475 with the heatsink fitted.
Dan
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attention. I did fix mine
some ten or more years ago and since then it has worked when needed. I
wouldn't worry about the lamp yet before checking the rest of it.
Dan
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to drill down close to 0.3m
level of accuracy.
We did want to repeat the tests with timing mode receivers set to
average for 48 hours, but haven't got around to it yet.
Dan
On 4/25/2018 12:00 PM, time-nuts-requ...@febo.com wrote:
Message: 6
Date: Wed, 25 Apr 2018 07:56:14 -0700
From: &quo
a precise
survey so the Rx knows where it is and so can achieve the maximum
accuracy in 2D position hold mode.
http://www.ke5fx.com/heather/readme.htm
will get you the program and pdf manual.
Dan
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To u
) and no sign of slowing down after several weeks.
Can someone recommend a simple and stable source of around 7 Volts so I
can use the (well aged and very stable) 8663?
Thanks,
Dan
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coefficient at room temperatures that had minimal variation
at around this frequency. Way better than the 32+ kHz crystals used now.
The clock died in the end but I still have the crystal somewhere :^)
Dan
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to prove
useful. The performance counter is, but getting the PPS code to read the
counter is still a software problem.
If you guys want to take this offline and chat about it further, I'd be
happy to discuss this without using up bandwidth here.
Thanks,
Dan
On 4/10/2018 4:01 PM, time-nuts
to compare the high
resolution uncorrected counter to NTP and the external PPS?
Agreed, not trivial. But maybe fun anyway!
Dan
On 4/10/2018 11:03 AM, time-nuts-requ...@febo.com wrote:
NTP already looks at incoming pulses and reports what it thinks is going on
with them. The desire here
with this (assuming
they're triggering an interrupt), and learn something neat.
Some of this is subject to change with windows versions:
https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
Dan
On 4/10/2018 8:01 AM, time-nuts-requ...@febo.com wrote:
kb...@n1k.org
, holding the temp constant)
for cost.
Dan
On 4/5/2018 12:00 PM, time-nuts-requ...@febo.com wrote:
Message: 11
Date: Thu, 5 Apr 2018 09:44:48 -0500
From: John Green<wpxs...@gmail.com>
To:time-nuts@febo.com
Subject: Re: [time-nuts] Environmental sensor recommendations.
Mess
On 4/4/2018 2:28 PM, ew via time-nuts wrote:
Lat year some one from the UK asked me about a 1 inch CRT for the Tracor 527.
I sent David Partridge one at the time, so he is now happy.
Dan
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and frequency of operation.
It appears there is a mini circuits part close by, possibly tied into
this amp. Can you tell what part of the circuit this board covers? GPS
signal, etc?
Dan
On 1/10/2018 1:26 AM, time-nuts-requ...@febo.com wrote:
Message: 3
Date: Tue, 9 Jan 2018 23:33:33 -0600
. LH performs fine for all the other units here as it always has
and the Trimble Monitor program works on this one.
I'd really appreciate someone telling me gently what stupid thing I'm
doing or not doing :^)
Thanks,
Dan - ac6ao
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change?
Dan
--
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ar or worse state when I got that, now comes to life
when needed.
Cheers,
Dan
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handy, USB on one end with
3.3V or 5.0V serial on the other. No dongles...
FYI, Mouser and Digikey are also sources:
https://www.digikey.com/products/en/cable-assemblies/smart-cables/468?k=FTDI
http://www.mouser.com/Wire-Cable/Cable-Assemblies/_/N-bkre6?Keyword=FTDI=True
-Dan
On 8/30/2017
be
missing above. Obviously, really expensive silly things won't be done on
my site for a few GPSDO's, but it would be good to know what the issues
are.
Thanks,
Dan
On 6/16/2017 6:29 PM, time-nuts-requ...@febo.com wrote:
Hi
Will there be an effect? Yes. Are roughly 99% of all GPSDO’s run
ority Wire and Cable" RG-6/U.
Did some measurements last night. It measures as 85 Ohm, with a velocity
factor of ~.86. It looks pretty lossy, but it should still work.
Any ideas and comments welcome!
Thanks,
Dan
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ion, a DDS clock for an HF transceiver, the result was well
worthwhile.
Dan - ac6ao
Crystek Test.doc
Description: MS-Word document
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e from NovAtel if they might
have any remaining units.
Any leads for this specific receiver would be appreciated.
Thanks,
Dan
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and
the higher temperature Panasonic fuse fitted and I
sleep well at night...
Dan
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On 5/1/2017 4:14 PM, Dan Rae wrote:
Basic system comprising:
3561A Analyzer
11848A Interface
11729C Carrier Noise Test Set with all extras to 18GHz
Basic system is spoken for. Thanks to all and to tvb for being there.
Dan
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: DIRECT PLEASE!
Dan
ac6ao
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may be able to fix, but I'm not certain obviously :^)
Dan - ac6ao
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anything more than there are jumpers inside that
can be changed.
Page 20 of the manual has the details...
Dan
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and follow
This is all cool stuff, and neat to read about.
What's the best (Most stable, most accurate, best adev, etc.) tuning
fork oscillator made?
What the lowest frequency tuning fork oscillator ever built? Was 1Hz
ever achieved commercially?
Fun stuff for Friday!
Dan
On 3/17/2017 12:00 PM
compared to not in an oven?
Or, are there other things that outweigh the gains by temp controlling
the whole thing.
Yeah, this is a pretty open question, but I don't really have a feel for
how good an oscillator needs to be before an oven starts to improve
things...
Dan
On 3/15/2017 12:00
. Corby: it this the 12 ohm
resistor you mentioned?
Scott, there's no way that oscillator can deliver the power needed to
excite the lamp with that high an R3. Something like the specified 10
Ohms is needed.
Dan
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To put BC-221 things in perspective, the 1 Mc/s reference crystal was
adjusted, according to the manual, to within 5 c/s...
Things have come a ways since!
Dan
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those worked. I just
wish I could find the one hidden in my garage :^)
Dan
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a quick note. Autodesk really needs to hear
how we all feel.
Thanks!
Dan
On 1/24/2017 2:06 AM, time-nuts-requ...@febo.com wrote:
Message: 3
Date: Mon, 23 Jan 2017 17:24:52 -0600
From: "Graham / KE9H" <ke9h.gra...@gmail.com>
To: Discussion of precise time and frequ
laying around?
They really look like a neat little unit. Thanks to all for the heads up
on these ones!
Dan
On 1/4/2017 12:00 PM, time-nuts-requ...@febo.com wrote:
Message: 7
Date: Wed, 4 Jan 2017 09:53:24 -
From: "David J Taylor" <david-tay...@blueyonder.co.uk>
On 12/18/2016 9:34 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
*12 -- ---MODE Survey: 0%
complete
If it's still showing that after being on for five hours, maybe it needs
to be explicitly told to
nd radiate at their own frequency.
This is not necessarily related to the switching frequency.
That said, it may be an interesting test to run anyway!
Dan
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current mode. Usually this is bad for noise generation. It
would be interesting to see what a scope trace of the switched leg of
the inductor looks like in both cases.
Dan
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caps that will need to be checked and replaced where necessary.
Having said that mine came back to life after being in dusty storage for
about ten years and all it needed was a good clean...
Dan
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regulator that failed putting the
full supply voltage on the IC?
Dan
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Simple, build your room (8 x 12), use a water sealing paint paint, install a
split mini cooling unit at approx.8,000 BTU, set temperature below oven
temperature of the equipment.Carefully choose AC size (not to big). Door at
far end of room.
___
Hi,
=
If you want to go Tom's picDIV route, and are lazy like me, this is one
of several boards available.
https://oshpark.com/shared_projects/kXG6K5Xu
You'll get several copies of the bard board for under $10. Few minutes
stuffing it, and you'll have a working device...
Dan
Hi Lee
For those of us who aren't scared of surface mount stuff, and maybe even
prefer it, will there be any bare boards available?
Dan - ac6ao
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the FET is hard to find now.
Dan
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shows dotted may not be real. The modern system John Miles designed can
no doubt do better and in about one hundredth of the volume, but is a
little more expensive :^)
Dan
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, not a problem I felt capable of or interested in tracking
down. In my sample of two from China via eBay, one was good the other not.
Dan
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...
I attach, if I can get it to work, a plot of three different Tbolts on
my 3048A system.
Dan
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chambers. They work great if you need to
hold temp long to stabilize everything before a measurement. Very nice
units for the price.
I'm sure you know this, but watch your temp gradients in the chamber.
Dan
As we all know, step #1 in making a clock is NOT
to build a thermometer:-)
I
our atomic clocks to IT every 6 to 12 months...
...now I'll be thinking of this all night... ...I think Tom is just
toying with us now...
Dan
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to work with it tomorrow and scan Fig 8-30. It's too hard
to abstract what you need, and will have to be in segments anyway.
Dan
ac6ao
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display, a new tube fitted in this case) that I rarely use
and I would be open to offers.
As to the eBay one shown with a UK power plug, I'm pretty certain that
the power transformer in these can be wired or switched for 110 / 220 V
but my manual eludes me.
Dave, it's been a few years since I was there but the Harrison clocks
are not in the main part of the museum but in the Observatory which is a
bit to the South and East if I remember right. Both are well worth a
look, but the Harrisons are magic of course.
Dan
, search terms, code examples are all welcome!
Thanks!
Dan
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they only claim to be a fairly
accurate clock. I doubt that any of the fancy schemes being proposed
for measurement will improve the basic accuracy much.
Dan
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, part sizes, solder type, solder
age, stencil design, board finish, and SMT pad design all add up. Tweaks
in the oven and stencil can be required to make it work.
It's the tweaking it that can get expensive fast...
Dan
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in the day.
Most more "modern" FMT approaches have been using sound cards, but I've
no experience of these.
Whatever method is used once you have any ionospheric reflections then
you will start to see phase shifts which will be what limits your accuracy.
FT245BM. I wouldn't expect that
to be able to transfer data at the full rate from the ADC to the PC. So
you'll be limited to the buffer size on board (memory or FPGA buffer)
for snapshots of data. That may not matter for what you'd be doing...
Dan
On 6/12/2016 12:00 PM, time-nuts-requ
On 6/7/2016 10:38 AM, cdel...@juno.com wrote:
RACAL MA259 FREQUENCY STANDARD FROM 1965
Looks neat
Corby,
Internally they're a rebadged Sulzer more or less. There's been one for
sale on eBay in the US for years, literally, at the somewhat ridiculous
price of over $3,000.
item:
Corby wrote:
Need help identifying the RF connectors on the unit.
Corby, I may have some connectors on leads but would have to dig deep in
my garage. They were used a lot on some UK made Racal receivers in the
sixties...
Let me know if you still need them.
Dan
/kXG6K5Xu
For those of you who don't know what a PIC DIV is:
http://www.leapsecond.com/pic/picdiv.htm
My guess is it would also work with a picPET and an FTDI cable.
http://www.leapsecond.com/pic/picpet.htm
Dan
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On 5/23/2016 3:54 PM, Dave M wrote:
Dan,
If you haven't already found the Z3801A page at
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should
read it thoroughly (in your case, especialy the section on the power
supply). there is a good pictorial that shows locations of all
might enable me to get it going again?
I've had the darn thing for fifteen years and miss it :^)
Dan
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I have a recording of this on my hard drive, at1.3 Gb it's too big to
email but I can share it via Wetransfer if anyone wants it. I would
need a recipient's email address to do this.
Dan
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expensive considering what you get.
http://www.acam.de/products/time-to-digital-converters/tdc-gpx/
Do keep us posed if you come up with something that works at 20Mhz or
30Mhz rate. I still have a possible application for something like that.
Dan
On 5/3/2016 12:00 PM, time-nuts-requ
like almost all oscillators, it will have 1/f flicker noise.
It's not unheard of around here to increase shot noise to solve the
problem...
Dan
(I'm done now, I promise!)
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.
John for what it's worth both my 8662 and 8663 which are late (1994)
revisions have these single 15 µF caps replaced by two parallel 10 µFs
among other changes in the power supply area. Maybe worth doing if
they can be fitted...
Dan
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time-nuts
ting blame on
FTDI for blocking it is unacceptable. Unfortunately, some of us trying
to save a few bucks are ripped off by vendors selling this garbage.
FTDI chip makes great hardware. Real FTDI hardware and drivers make an
amazingly easy to use USB solution. They are extremely reliable.
Dan
On
be reassembled this way also.
My guess is even the cheap inductive cook tops would work for this.
Dan
I have read sometime ago and probably on this list a success stories
about opening OCXOs using a hot air gun or even a propane torch, an
x-acto knife and a stainless steel shim sheet to avoid
I saved my LH screen just as the period of seeing no satellites ended
with one coming into view at the bottom, and again maybe an hour and a
half later. In between LH reported "No Almanac" at some point.
Whatever was being done must have been fairly m
the faults [at least the major ones] lie in the basic hardware,
so I don't think we need schematics particular to the 3048A if there
are differences.)
The 3048 system uses a standard (working!) 3561A. There are no
differences. I don't think the optional extra memory is required eit
a LH survey at present with it perched temporarily on a wall
at the back of my house and it seems healthy at 5V supply.
Dan
ac6ao
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renovating a Tek 475 'scope.
Regards
Dan (A newbie from Denmark)
-Oprindelig meddelelse-
From: davidh
Sent: Tuesday, January 19, 2016 11:21 PM
To: time-nuts@febo.com
Subject: [time-nuts] PRS10 C900 replacement
Hi All,
While still appearing to function normally, my PRS10 started to smell
On 1/16/2016 5:00 PM, KA2WEU--- via time-nuts wrote:
Did my plot make it ? Ulrich
It did. Very impressive!
Dan
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difference. If this
holds solid, in a few days I'll swap splitter ports again.
Thanks,
Dan
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anyone offer any insight as to why the two units may have a
different PPS output timing? It's not really a problem, more of a
curiosity and mildly academic exercise.
Thanks,
Dan
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for moving the thing from one lab to another adjacent rather that
flying clock trips or mountain climbing :^)
Dan
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On 11/20/2015 10:52 AM, cdel...@juno.com wrote:
Any one know how many cells went into the HP 5065A battery packs?
21 Corby, in three rows of seven, from my notes when I re-celled mine.
Dan
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the thing up for at least twenty minutes, which I would think
is what matters.
It would in any case be difficult to fit any more than 21 in the space
available.
Dan
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some small degree of protection against
meltdown due to the thermistor failing open, a good replacement which
fits is available for less than $1 from Digikey: EYP-1BF115.
This was discussed about a year ago at some length.
Dan
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, with the oscillator
sitting at around 3e-12 per day drift. (The oscillator was on for about
6 months prior to being hooked to the GPSDO...)
Dan
On 9/23/2015 3:10 AM, time-nuts-requ...@febo.com wrote:
Date: Tue, 22 Sep 2015 23:49:25 -0400
From: "Bob Benward"<rbenw...@verizon.net&g
than I had with the hardware, and I still have not
managed to generate my own calibration files...
John Miles has some excellent pages on his site concerning the 3048A.
Dan
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that there was way too much to move from one to the
other and vice versa, and not all of it easy to identify either.
All the ICs with paper labels are similarly marked in both the -0 and -1
units.
Much as I like a challenge, this is a few dozen parts too far for me...
Dan
the ROMs are the same, at least they have the
same part numbers.
Dan
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to dig it up when I get home.
Dan
On 8/3/2015 12:00 PM, time-nuts-requ...@febo.com wrote:
Hi
The “external” heater on the Z3801 OCXO is only needed if you are regularly
running below -20C in your environment. Other than
the alarm signal, there is no harm in letting it simply shut off
Sure. I uploaded a scan of the catalog parts to KO4BB. It's listed in
Recent Uploads awaiting sorting.
As for the 2100F manual, is there a scan available online already?
Dan
On Sun, Jul 26, 2015 at 2:03 AM, Poul-Henning Kamp p...@phk.freebsd.dk
wrote:
In message
in the UK, at the time shipping
wasn't as bad as it is now, so I hope he was reasonably happy. I can't
see any real hope of it ever coming back here, although there have been
frequent reports of eLoran testing, I'm not sure they ever amounted to
anything.
Dan - ac6ao
today on a 2465B 'scope shows an absolutely static trace at the highest
timebase speed.
What measurement method would you recommend, absent a working Caesium
standard and a Timepod? I have a 5370B somewhere, but nothing more modern.
Dan
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hate
to constantly be fighting the noise floor of the instrument. I'll treat the
data from frequency mode as relative and that should get me what I need. At
least until I own a better instrument.
Thanks
Dan
On Tue, Jun 30, 2015 at 10:49 PM, John Miles j...@miles.io wrote:
Yep, it will ignore
him a screen cap to see what's up.
None the less, I manually enter the time units and was able to plot some
data. I attached a new screen cap. How does this look?
Thanks
Dan
On Tue, Jun 30, 2015 at 5:36 PM, Bob Camp kb...@n1k.org wrote:
Hi
Are you using a PPS as the “start” and the 10 MHz
detected to set the units automatically.
I'd be happy to send you a tim file as well if necessary. Let me know.
Thanks
Dan
On Tue, Jun 30, 2015 at 8:51 PM, John Miles j...@miles.io wrote:
Let's see a snapshot of your acquisition dialog, just before you hit
'Start'. (Or send me a .tim file
.
Regards,
Dan W
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a handful of code lines to get started.
Thus I am looking for a few volunteers with the hardware, time and desire to
help test and validate the utility of the library before I release it to the
community wild. If you are interested please let me know off-list.
Best,
Dan Quigley (N7HQ)
Note
I'll
go with that.
Dan
On Tue, Jun 9, 2015 at 8:52 AM, Dan Kemppainen d...@irtelemetrics.com
wrote:
Hi Dan,
74LVC1G80. See: http://www.ti.com/lit/ds/symlink/sn74lvc1g80.pdf
Might be worth looking at.
Dan
On 6/9/2015 4:24 AM, time-nuts-requ...@febo.com wrote:
Let's say I have a 20MHz
Hi Dan,
74LVC1G80. See: http://www.ti.com/lit/ds/symlink/sn74lvc1g80.pdf
Might be worth looking at.
Dan
On 6/9/2015 4:24 AM, time-nuts-requ...@febo.com wrote:
Let's say I have a 20MHz TCXO. I want to square up the output signal and
divide by two. Easy, just a buffer or inverter and a flip
perspective using three devices instead of two would be
easier. However the thing will be battery powered, so I'd like to save the
power if possible.
Thanks
Dan
On Mon, Jun 1, 2015 at 6:13 PM, Andy ai.egrps...@gmail.com wrote:
The gates on that page
http://hyperphysics.phy-astr.gsu.edu/hbase
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