On 6/25/11 5:03 PM, Neville Michie wrote:
An interesting question about making a 50/60 hertz source,
Does a 120 to 12 volt transformer have enough inductance to use as a 12
to 120 volt transformer?
Remember, the inductance is proportional to the square of the no of
turns, where as voltage is
On 06/26/2011 04:04 AM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
It could be interesting just to monitor the phase of the L1, L2 and L3
phases of the house. :)
Is 3 phase standard in (some/most/?) European homes?
We are off-topic here, so let's keep this sub-thread short.
I
On 06/26/11 07:25 AM, David J Taylor wrote:
I've got one of the cheap radio-controlled clocks? I was listing to
radio 4 the other day and herd the time signal. The radio controlled
clock was about 3 seconds off. I was a bit surprised it was so far
off. I'm just wondering how accurate these
In India we have 50 Hz +- 2Hz !! Clocks that run on mains frequency needed to
be modified with a NS chip that ran off a NTSC color xtal.
Homes used to be All electric in the old days with 3 phase (Like mine). I
have had the neutral in the cable burn up due to road digging and lost a lot of
On Sun, Jun 26, 2011 at 10:04, Hal Murray hmur...@megapathdsl.net wrote:
Is 3 phase standard in (some/most/?) European homes?
Just for the record:
In Singapore, 3-phase is common, except at the smallest possible loads (a 50
sqft corner stand). You get 4-wire, 3-phase as your normal supply.
A simple way to measure the line frequency (up to a given precision...)
is to watch on a waterfall program to one of its harmonics.
In the following picture you can see the 53rd harmonic of the 50 Hz line
frequency in Italy. It was captured by just connecting a random length
of wire to the line
A simple way to measure the line frequency (up to a given precision...)
is to watch on a waterfall program to one of its harmonics.
In the following picture you can see the 53rd harmonic of the 50 Hz line
frequency in Italy. It was captured by just connecting a random length
of wire to the line
Don,
I haven't looked into it for several years, well over 12, but I will take a
gander at this. What brand was the converter?
After reading about everyone out of the US having 3 phase, it makes one
wonder why we didn't do that years ago. As of now, the only 3 phase lines
around here are close
I have one of my Junghans Mega next to my computer and use it for ebay
bidding and it is always better than a second.Bert Kehren
In a message dated 6/26/2011 10:23:16 A.M. Eastern Daylight Time,
david.kir...@onetel.net writes:
On 06/26/11 07:25 AM, David J Taylor wrote:
I've got
Group,
My plan for precision 60 Hz was to use a Caesium standard and
an HP 3320B synthesizer. At about that time, some 200 watt
amplifiers became available on eBay. They were designed for
public buildings to do elevator music or emergency announcements.
Accordingly, they ran on 120 VAC 60 Hz or
I have a cheapie digital atomic clock I bought at Walmart several years
ago, and I forget the brand, but it works spot on with my PC's clock. That
is as long as you make sure to place it where the signal is strong enough
for it to update itself. However, it does not update all the time, and
reads
On 6/26/2011 6:03 PM, Tom Van Baak wrote:
Alberto,
That's a cute plot. I see 53 x 50 = 2650. What is the x axis scale?
Tom,
that capture was taken a few months ago, from memory it should cover about
15 or 20 minutes.
But I'm curious -- the pending issue with 60 Hz in the US is more about
On 6/26/11 8:34 AM, Alberto di Bene wrote:
A simple way to measure the line frequency (up to a given precision...)
is to watch on a waterfall program to one of its harmonics.
In the following picture you can see the 53rd harmonic of the 50 Hz line
frequency in Italy. It was captured by just
In message 4e066fac.5090...@rubidium.dyndns.org, Magnus Danielson writes:
Infact, Poul-Henning and I had the idea to test this on our grid to see
what kind of performance we would get out of it. He sent me a
transformer prepped for the work, but it seems both of us got caught up
doing other
I quite like your generator description of huge rotating lumps of
copper-ensnarled iron. It brings me back to around 20 years ago, when I
was a plant electrician at an older railcar manufacturer. They had huge
open-frame synchronous motors, from around the 1930's, that ran their air
compressors,
I've got one of the cheap radio-controlled clocks? I was listing to
radio 4 the other day and herd the time signal. The radio controlled
clock was about 3 seconds off. I was a bit surprised it was so far
off. I'm just wondering how accurate these things are.
David,
Be aware that if listening
Last year I picked up a frequency standard that inputs 120VAC (or 12V DC)
and drives a 6 0Hz Synchron motor based clock and also has a 120V 60 CPS
output on the back. I wasn't sure what I was going to do with it, but now I
know I can run my old telechron synchronous clocks with this when the power
Mitchell,
I'm not sure, as I couldn't see anything to hint at the maker on the
cabinet. I also couldn't see who made the clock movement either, as their
was no name on the clock face. Of course, companies like HP and others
bought those from a good OEM manufacturer to use, so I doubt they made
On 6/26/11 10:38 AM, Poul-Henning Kamp wrote:
My idea for measuring this, was to measure the time from the
utc second from a GPS receiver to the first zero-crossing of
the grid, and try plot Magnus and my measurements together.
So, to make this easy on folks..
Seems the easiest PC hardware
Will Matney wrote:
snip
As of now, the only 3 phase lines around here are close to the major
roads where business resides, but when you get into the residential
areas, it's only single phase on the poles.
Best,
Will
Will,
I am going to have to disagree
Sorry,
I guess the blue color did not come through.
OH WELL !
BillWB6BNQ
WB6BNQ wrote:
Will Matney wrote:
snip
As of now, the only 3 phase lines around here are close to the major
roads where business resides, but when you get into the residential
areas, it's
In Australia, power is reticulated as three phases of 415V.
In suburban streets, 4 wires provide neutral and 240 Volts,
each house is supplied with one, two or three phases as they need.
I had 3 phases installed as 2nd hand machinery with 3 phase motors was
cheaper than single phase items
Hello Mitchell,
I believe this is a W. F. Sprengnether Instrument Co. Inc.
TS-100 (presumably used for driving seismometers).
I have a pretty much identical unit and it remained a mystery
until I took the rack panel off to reveal the logo on the front
of the chassis.
Bill,
I wish it was that way here, but it's not, only along the highway where the
general business is located. Now, across the Ohio River, on the Huntington,
WV side, it is more insudtrial, and they do have it in places as your
thinking of, all through town. It's like that from Huntington WV,
Hah, I really mis-spelled industrial didn't I?
Sorry folks, the spell check doesn't work on my e-mail now for some odd
reason.
Best,
Will
*** REPLY SEPARATOR ***
On 6/26/2011 at 7:55 PM Will Matney wrote:
Bill,
I wish it was that way here, but it's not, only along the
Will,
What you describe does NOT make sense. When you say nuetral or ground do you
mean a second wire ? Surely you do not mean they are using the earth (dirt) as
a
return path ? That would be terribly inefficient ! Equally, if the 220 center
tap is earthed along with one side of the higher
On Jun 25, 2011, at 7:31 PM, Jim Lux wrote:
although it's a lot easier if one of the links is down and they're running
with the ocean return path.
Ocean return path? Please say more.
I picture a gigantic carbon electrode stuck in the ocean by a power station -
rather like the core of a
Bill,
I'm not sure what the voltage is, as I remember asking about it at one
time, when the transformer went belly up, and I think he said 4 kV, but I'm
not sure. Now, as to the neutral wire, it runs along the poles just under
the hot, and about even with the transformer. It's a two wire system,
Will,
OK, that sounds normal to me. Originally, your first description made it seem
as
something completely different.
I see nothing wrong with what you are now describing. The fact that they are
feeding short blocks via the REAR ALLEY from the main street is not unheard
of. And using just 2
The clocks are amazingly inexpensive these days typically sub $10. Pretty
amazing and run on 1 aa battery. That said what I have seen is they tend to
stay right on time at least using my ear and a wwv rcvr. Granted if they do
not get sync for several days you do see them start to creep. But not
As for monitoring 60 Hz, I was doing some on line research, and found some
interesting power line frequency meters at:
http://www.laurels.com/frequency.htm
Surprisingly affordable (less than $300).
Tom Frank
For this experiment you want an [accumulated] phase error meter,
not a line
Will, and the rest of you fascinated by power distribution,
A big synchronous motor allows its power factor to be changed by
changing the field current for a given load. The motor can be
adjusted to look like a resistive load instead of inductive, or
even capacitive to correct plant power factor.
On 6/26/11 6:29 PM, Thomas A Frank wrote:
On Jun 25, 2011, at 7:31 PM, Jim Lux wrote:
although it's a lot easier if one of the links is down and they're running with
the ocean return path.
Ocean return path? Please say more.
I picture a gigantic carbon electrode stuck in the ocean by a
Bill,
I never did set back and think why they used them, but that would make
sense. The new plant engineer they hired, during my time there, talked them
into installing a new power house (air compressor system) in the paint
department. However, he had ordered screw compressors, running on 460 V,
On 6/26/11 8:23 PM, Jim Lux wrote:
I just have to look for a set of towers with a single duplex cable.
(actually a bit of googling found a report
www.kentercanyon.org/index.php/download-public-docs/doc/25/raw
)
OK.. the electrodes are about a mile off shore from Gladstone's-4-Fish
on PCH
Here's another thought on all of this. How will this effect the newer
electronic watthour meters at peoples homes? I remember looking at the
schematics on one of these, and I don't remember seeing an internal time
base, crystal, or resonator in the circuit, so I suppose they might get
their timing
http://timesofindia.indiatimes.com/world/us/US-clocks-to-gain-20-min-on-grid/articleshow/8996769.cms
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc The High Reliability Software
10255 NW Old
In message 4e07f7c7.9070...@earthlink.net, Jim Lux writes:
That sounds like a recipe for excitement - DC current into
seawater should generate hydrogen on one and and oxygen on the other
electrode. At 3000 amps, rather a lot of it.
Actually you get chlorine gas at one end, can't remember
In message 201106270013470285.1b239...@smtp.citynet.net, Will Matney writes
:
Here's another thought on all of this. How will this effect the newer
electronic watthour meters at peoples homes? I remember looking at the
schematics on one of these, and I don't remember seeing an internal time
base,
Hi Jim,
I was studying that area in Google Earth. There is detail for under water
objects near the shore line.
There are some objects that look like troughs in ocean floor just south of the
location that are grouped in pairs. Taking a measure from the first pair does
place it about 6000 feet
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