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Date: Wed, 31 Jul 2013 19:14:58 -0400
From: Bob Camp
2) I'll *guarantee* that the workers in the pictures didn't show up for work on
a normal work day dressed like that.
With Glass/Epoxy protoboards being so expensive, I have bought several lots of
a phenolic perf board for prototypes off the web and they have been the most
inexpensive boards I have ever found. I don't feel bad about trashing failed
prototypes.. Search your favorite site for 7x9cm PCB Blank
Seller obviously figured out that somebody feels they are of value and adjusted
the selling price to see what he can squeeze out of them. I'd suggest making a
$20 offer if you want to try to drive the price back down to what is reasonable
Message: 6
Date: Sun, 19 May 2013 18:07:51 -0500
From:
On and off I have been receiving error messages from various pieces of
equipment about NTP errors from my pool of Symmetricom receivers. I finally
found NTPTool at:
http://www.geardownload.com/internet/ntp-server-tool-download.html
(Click on the blue download image above the thumbnail image
While the Trimble Tbolts are still out there and reasonably available, are
there any newer alternatives in the same general price range?
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Good heavens, no. By doing so, they both have the same reference and the
measuremets actually means something. I have a stack of HP stuff (3586, 3386
and assorted counters) all T'd off my Tbolt without issue. The only caveat is
that you don't put too much stuff across the T-bolt output so as
Kind of funny you bring that up. I have an old Fluke 1900A counter (plastic
case) that radiates 10mhz clock that deafens my receiver. It only took me a
week to find the intermittent source of interference Boy, did I feel
stupid...
-
Date: Thu, 29
I have purchased many items over the past few years from Sure and have never
been dissapointed in that I receive. They do seem to have multiple seller
accounts, each with different items - sureelectonics sureelectronics1
sureelectronics2 etc.
Any way, I did a serch by seller and found a
In the RC Model Airplane world where some brave souls are experimenting with
autonoumous (UAV) flight , it is usual that they have a part-15 video downlink
and/or telemetry at 900mhz or 2.4ghz and unless you put a trap on the input to
the GPS receiver to significantly reduce those frequencies
If you want to see a R E A L L Y big vlf antenna check out thest two
links. The first is about Soviet and US VLF antennas used for submarine
communications during the cold war, and the second has a copule of photo's at
the end of the powerpoint presentation of the installation in Cutler,
Would something like eBay 180460919851 be a suitable adaptor? The
description
says that it takes .1 header pins on .3 centers 'ready for socket insertion'.
I'm sure that there are other places (Sparkfun) that sell similar adaptors for
those that have an aversion to on-line auction sites for
I'm running more than a few days late on mail, but my inclination would be to
order a custom programmed SI5355 from Silicon Labs for $5 - no minimum quantity
and 2 week turnaround. Admittedly the part is a qfn (SMT Quad Flat-pack
No-leads) but it is easy, can run off an external user provided
This is for the Uber-Timenerds
http://www.adafruit.com/blog/2010/06/24/multimeter-clock-styled-after-the-simpson-260-multimeter/
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The ugly header is a 2mm spaced header instead of the 'normal' .1 header
(2.54mm). You will find that you can use a laptop 2.5 drive adaptor connector
will typically have 2mm to 2.54mm headers that can be 'adapted. I suspect
that you can purchase 2 row 2mm headers on that on-line auction
I noted this while looking for a DDS VFO, and thought it interesting and
affordable if you are interested in a 60khz WWVB receiver kit for $30 plus
postage. As a standard disclaimer, I have no affiliation with the gents
producing the kit. The URL is: http://www.qsl.net/k5bcq/Kits/Kits.html
Interesting read on a low phase noise oscillator by Chris Bartram GW4DGU
http://www.christopherbartramrfdesign.com/blaenffos/oscillator/VLNO.pdf
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Approaching off topic, but possibly of interest as Loran and WWVL is on the
fringes of this...
I have several dead King KR-85 ADF untis that I want to repair and press into
service as 505khz beacon monitors. Designed primarily for receiving 200khz to
500khz
The word we got from our Dell National Accounts rep was that there was a run of
contaminated electrolyte affectring several capacitor manufactures. Gee, go
figure QC issues in a country still painting toys with lead based paint...
Any way, I recently purchased a pile of low ESR caps from
Any chance it is a Jupiter?
http://www.gpskit.nl/gps-readme.html
If so, they are fine receivers. THe header pins are 2mm spcing - same as used
on laptop hard drive adaptors
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Also used on old lighthouse tubes used for uhf and low microwave applications
fro the '40's and '50's. If my memory serves me, these tubes were found in
devices like the airborne APX-6 IFF Transponder in which the greatest hazard
was the detonators used to destroy the device should a plane go
For those who are ARRL members, they now have archives of QST on-line. I
stumbled across a two part series in the Sept and Oct 1952 QST ehtitled:
What Price Precision? The economics of Frequency Standards
By George X.M. Collier W0EG
The article highlights Crystal Charactgeristics,Hammarlund
My own gut feeling is that it is a glitch making its way through one of the
power supplies. Its decay looks like it could be capacitive... Pr thermal.
or (fill in the blank)
I'm using the brick power supply povided and it is possible that they generate
transients, or poorly react to normal
I too am seeing them - four or five events during a 24 hour time period. Below
are 50 temp readings before and after an event.
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.82
32.83
32.92
32.91
32.90
32.89
32.89
32.88
32.87
32.87
32.87
32.86
32.86
32.85
32.85
32.85
32.85
32.84
32.84
32.84
Well - I have lots and lots of raw numbers, and no really good way of plottinng
it. I'm hardly a linux guru, but would gnuplot be a suitable tool for graphing
data like the snipper below?
374741 -0.5 0.00 0.7314587 32.10 0 130 18.2 158 4.0 12 1.8 132 3.2 157 9.0 152
5.8 138 12.0 133 6.2
The manual doesn't give much direction on tweaking the disciplining parameters.
Also, not having anything better to compare results to, I'm pretty
handicapped. Has anybody done any tweaking and perhaps can offer any
suggestions?
Over the weekend I was able to get a GPS antenna on the roof
As the requirement is for a few milliamps it appears that All Electgonics has
an inexpensive DC DC converter
http://www.allelectronics.com/make-a-store/item/DC-32/DC-DC-CONVERTER/-/1.html
that runs off of +5v. All I have to do is to run the -19v output throught a
negative regualtor and its a
As I sit here reviewing the power requirements for the Thunderbolt, I note that
the -12v is only 10ma. Does this indicate that it is only used for the RS232
output and if so for a battery backup I can cheat and only service the +12v
(750ma)and +5v (400ma)?
/snip
Date: Mon, 23 Jun 2008 09:24:35 -0700 (GMT-07:00)
From: Richard W. Solomon [EMAIL PROTECTED]
Subject: Re: [time-nuts] THUNDERBOLT STATUS LED'S
If there is NMEA Data available, there is a design utilizing a PIC chip
that will indicate 3D GPS Fix. It was published by W1AUV.
73, Dick, W1KSZ
From: Luis Cupido [EMAIL PROTECTED]
Can anyone point me to any simple program, must run
on older machines (windows 98) be and free.
I mean very basic stuff for sanity checks of system
antena etc.
--
Very basic, Very Simple and very Free.. Use the
hyperterminal program that
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WOW!!! What a resource. Something for everybody from
the kid that is geo caching to the physicist. Nice
digital delivery too..
http://www.gpsworld.com/
Tom
I just received an older 8 channel Oncore GPS board -
still not sure if it is a timing or navigation part...
In any event, I have found plenty of documentation on
it, but so far none of the links for the Motorola eval
software WinOncore (presumably free) seem to be
functional. Can someone help me
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http://www.snopes.com/college/exam/barometer.asp
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Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
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This has been a fascinating and educational thread! I
have always been aware of noise coming from switching
regulators - just have Argo or Speclab look at your
laptop's sound card with no input signal and there
is plenty to
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Thanks for all the good feedback! Looks like the LM388
is the way I'm to go. Got to toddle off to the local
surplus shop in the morning to see what they have in
the goodie bin. If they don't have it eBay is full of
them.
Tom
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Thanks for all the replies on-list and off! I also
found a list of manufactures at:
http://tf.nist.gov/general/receiverlist.htm
Tom
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Tired of spam? Yahoo!
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Does anybody know of a product that is an NTP server
that gets its time source from WWVB at 60khz? There
are lots of Atomic Clocks out there but I haven't
seen one that does what I want.
If I had money I'd be purchasing
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While the website is not explicitly about frequency
measurement, there is an interesting bit on improving
the stability of crystal oscillators with external
heater controllers. While it may not be suitable for
long term high
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I also bought one that hasn't arrived yet. With the XO
in the part number I am under the belief that it is a
crystal oscillator, not Rubidium. I may be wrong, but
the unit with the Rubidium oscillator is probably
LUCENT
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Nice web page at KO4BB's Home Page:
http://www.ko4bb.com
Lots of good stuff including a 30 page brief operating
manual for the 3586.
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I have gathered everything I need to assemble a GPS
Disciplined Oscillator. I have the Brooks Shera
controller assembled, am about 99% done on the linear
power supplies for +/- 5V, 12V supplies and a separate
24V oven heater
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I am replacing a defective Channel C board in my
trusty 5328 counter. The old board is PN# 05328-20016
and the replacement (off eBay) is 05328-60045. Not
quite plug-N-play... The new board has an SMA
connector (I can handle
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The key is the gas tight connection between the
surfaces. If moisture and/or oxygen can't get in the
conection will remain true. Back in an earlier life
in the telecommunications industry connections went
from soldered to wire
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Just to stir the pot a little - I'm providing a link
to Discover magazine - a tome of great repute and a
source of information on scientific discoveries of
epic magnitude... Enjoy...
http://discovermagazine.com/2007/jun/in-no-time
Wow - only $750 in quantity of 20 or $1k in singles.
That's not much more than what you spend putting
together your own. By the time you come up with the
HP-10811, controller, power supplies and GPS you have
come close.
So, can I borrow $1k from someone? :)
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Is the Doug Baker LF antenna still available? If so,
how does one go about obtaining one?
Get the Yahoo! toolbar and be alerted to new
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Brooke - you scored a bullseye on that one. I had a
couple of false starts, but got an email back from
Frank Gentges suggesting I contact Far Circuits for
the PC boards ($11.50 for the set which includes
shipping). Now to obtain the
Greg Burnett hit the nail on the head. It is a
machined base with four solenoids. I'm a bit hesitant
to start taking screws out of it as I'm not sure what
holds what together... Though if it is dead, what
additional harm can I do...
Any waym the assembly seems to have an HP part number
of 1979a
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I perused the pdf manual and came up more confused
than when I started...
My problem seems to be in the Option 005 high
precision attenuator (as I can best tell). There is
an aluminum box between the circuit board and the
front
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The UPS man just delivered a care package from my
latest ebay purchase!!! I fired it up and found the
front panel displayed properly, but no output on the
75ohm BNC connector, but the rear panel 21-60mhz aux
works fine as mesured by
I'm wanting to work on the divider chain to incease
the gate time from 10 seconds up to something much
longer forr increased resolution. Are these on-line
somewhere?
Tom in St. Louis
Choose
the right
Before I go and spend $150 on eBay for one - I would
like to know if they can be used as a stand-alone GPS
desciplined oscillator without the 10mhz input from
the rubidium unit.
Also - has anybody found a manual on-line for one of
these guys?
73 - Tom in St. Louis
There was an older posting
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