Bill, I have elected to do just that. I ordered a few USB female connectors
with tiny pcb and a male-to-male cable. I will put a milliammeter in the dc
line. My total cost around two dollars and I use my own test equipment.
Bob
On Wednesday, December 4, 2019, 05:01:20 PM PST, WB6BNQ
wro
I am going the DIY route on this one. I ordered the hardware and will build a
little tester. No fancy readout or otthr circuitry, just a way to access the
5V for voltage and current readings. My total cost should be a couple of
bucks. I did look for the price on those units you show but did
It would appear that the HP 3456A in temperature mode would meet your needs.
The 5k thermistor is very cheap. The temperature resolution is very small, as
I recall perhaps 0.001 degree but not sure. You can log manually or via GPIB.
Don't think its accuracy is anywhere near its resolution b
Great job Tom! It's an important service you have here and for me at least,
an irreplaceable resource. I have learned more than I thought possible and a
good part of the blame rests on your shoulders.
Keep up the great work, and happy new year!
Bob K6DDX
On Thursday, December 31, 2020, 09:
Is that a PR Peterson Radio logo?
On Sunday, February 28, 2021, 03:53:32 PM PST, Dan Kemppainen
wrote:
Hi All,
I've picked up a couple of old crystals. Mostly because they look neat.
They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm
thick. Was able to get them to
With any luck, the current administration will successfully push the USA down
technically. Denying global warming, shutting off time signals, and so on, is
great stuff.
On Saturday, August 11, 2018, 6:10:12 PM PDT, Bob kb8tq
wrote:
Hi
One would *guess* that stopping WWVB (and killin
Bob,
I am interested in the XOs. What do you have, and how much to get it to me in
Los Angeles?
Bob
On Wednesday, September 19, 2018, 1:31:48 PM PDT, Bob Martin
wrote:
Time-Nuts,
Thanks to those who took the various signal distribution
boards and other stuff. You took almost ever
Off topic, but I heard tonight that WWV is going off the air at the end of
this month.
On Sunday, October 14, 2018, 9:24:51 PM PDT, Tom Van Baak
wrote:
> This is just a free running PRS10 wired to a TAPR TICC, I thought that I
> would
> run some stand alone tests before I brought my
You can solve the spur problem by using the signal to lock an oscillator.
Some added phase noise but the oscillator can be very pure otherwise. Many
years ago I wrote an unsuccessful proposal for a synthesizer using that idea,
since the spectral purity spec was too tight to use synthesizer ou
I would imagine the switch selects every 50 or 100 MHz for easier
identification of harmonic number.
Bob
On Friday, January 4, 2019, 3:10:36 PM PST, Brooke Clarke
wrote:
Hi:
Made by Control Electronics Co. Inc, Model 121, with Navy Calibration Program
stamp.
This is a comb generator
Please excuse my ignorance but I have been trying to improve on my frequency
calibration.
I have always used WWV but when I try to get really close in frequency, the
beat and the fading are difficult to separate.
Someone suggested I get a GPSDO to refine my 10 MHz. I looked around and have
seen
need. What do you want to
accomplish.
Regards
Paul
WB8TSL
On Fri, Jan 25, 2019 at 9:05 PM Bob Albert via time-nuts <
time-nuts@lists.febo.com> wrote:
> Please excuse my ignorance but I have been trying to improve on my
> frequency calibration.
> I have always used WWV but when I try to g
on the air
and ask around. Might be someone just a couple of blocks away who has all you
need.
Cheers,
Dave M
- Original Message -
From: "Bob Albert via time-nuts"
To: "Discussion of precise time and frequency measurement"
Cc: "Bob Albert"
Sent:
lux
wrote:
On 1/26/19 10:43 AM, Bob Albert via time-nuts wrote:
> Dave, thanks for the info. I am, as I have said, money limited to the point
>where most solutions won't work for me.
> My counter is an HP 5328A I belive. Not the top of the line but with care it
> can do
rling
wrote:
On 1/26/19 4:31 PM, Bob Albert via time-nuts wrote:
> Well you are right that I am bit far from JPL. I used to work there. But I
>am impressed with the number of replies and the number of suggestions. I am
>still mulling over what will work for me.
Bob,
Freq
I read that technical description from the 1970s of how a cesium standard
works, with the 137 Hz modulation and all. Fascinating. Maybe I will try to
build one. How hard can it be? Maybe someone should offer a kit.
Those guys at HP were amazing. Not so much that it's a complicated scheme, b
Well lately I have been disappointed with the quality of writing of the
manuals. Not just HP, but I do expect better from them. Typos, poor grammar,
occasionally poor content. Very little said about errors that appear on
screen, for instance.
Sometimes I wonder if the circuits and software a
It depends on what kind of measurements you make. I have many voltmeters and
use what is appropriate for the task. I can measure very accurately if
necessary. My spectrum analyzers are great rf voltmeters. I have some of the
Harbor Freight cheapies that are handy for many occasional uses.
I have a cheap Chinese clamp-on power line ammeter I use occasionally. Its
lowest range is 20 A I think but I built a 10:1 expander (very simple). I also
built a line separator so I can grip just one line.
Bob
On Saturday, March 23, 2019, 5:00:23 PM PDT, Jim Harman
wrote:
jim77...@g
s. I especially liked "get the
> > orange one". Because that's what I did get (I think it's orange - could be
> > yellow).
> >
> > I was deliberately vague (apologies) but I just wanted a broad response.
> > Which I got.
> >
> > I've
Very nice! I look forward to reading all of those. I hadn't known of that
publication.
Bob
On Monday, March 25, 2019, 3:03:12 AM PDT, Tom Van Baak
wrote:
Some of you know that I'm a pack-rat for vintage instruments, books,
documentation, and publications about atomic clocks. Especia
I have been pondering something somewhat related to all of this.
We know that the smallest unit of a substance is a molecule. The smallest unit
of charge is maybe an electron. So what could one imagine the smallest unit of
time to be? Is time digital in the nanoscale, or is it always an analo
Well I have enjoyed time and frequency measurement for many years. I have no
equipment (nor do I expect to get any) that can tell the difference between the
current second and the proposed standard. And at one point I asked if there
was a limit on the smallest time interval that could be disc
Very interesting! Recently I had a somewhat similar experience. My neighbor
was throwing out some shelving that looked like what I need. It was gray
steel, all the vertical parts needed but no shelves. I made shelves from
plywood and ended up with a nice addition to my lab. To make it mobi
I have tried to measure the power line frequency with spotty success. My best
results came from a period measurement, as many periods as the counter can
accumulate. Due to noise, one is never sure at quite what point the source is
measured. Perhaps a brick wall filter would clean it up for a
eement was astonishing. It was milliseconds in time and ADEV
down to e-8 over a day:
http://leapsecond.com/pages/mains-cv/
See also: http://leapsecond.com/pic/mains-adev-mdev-gnuplot-g4.png
/tvb
On 7/2/2019 10:09 PM, Bob Albert via time-nuts wrote:
> I have tried to measure the power line frequenc
I am in some ways a beginner also. But here is one way to calculate error.
Figure the number of seconds in 100 years. You just compute the number in a
minute (60) times the minutes in an hour (60) times the hours in a day (24) and
so on. When you get to 100 years after all the multiplications
What is the connector for RS-232 on that Chinese GPS receiver?
Bob
On Tuesday, September 10, 2019, 02:00:20 PM PDT, Andrew Kohlsmith (mailing
lists account) wrote:
Good afternoon, Adam,
> On Sep 10, 2019, at 9:49 AM, Adam Kumiszcza wrote:
> Here I found some info about it:
> https://
Link doesn't work.
On Sunday, December 26, 2021, 05:41:01 PM PST, Nigel gm8pzr via time-nuts
wrote:
For those interested in the historical aspects, mid 50s in this instance, of
crystals and crystal oscillators in radio equipment...
https://worldradiohistory.com/BOOKSHELF-ARH/Tube-Techn
I found this:
Handbook of Piezoelectric Crystals for Radio Equipment Designers
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Handbook of Piezoelectric Crystals for Radio Equipment Designers
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On Sunday, December 26, 2021, 06:05:52 PM PST, Bob Albert via time-nuts
wrote:
Link
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On Sunday, December 26, 2021, 07:28:09 PM PST, Jeff Zambory
wrote:
It worked for me. It just took a while to load a 701 page PDF.
Sent from my iPad
> On Dec 26, 2021, at 7:06 PM, Bob Albert via time-nuts
> wrote:
>
> Link
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