The context is using the 60 Hz line for timing.
I'm feeding 60 Hz from a wall wart transformer into a modem control signal
that the kernel PPS stuff watches. Mostly, it works as expected, but
occasionally, it picks or drops a cycle.
In order to understand what was going on, I fed the same
On 1 September 2012 00:00, Kevin Rosenberg ke...@rosenberg.net wrote:
On Aug 31, 2012, at 4:05 PM, David Kirkby david.kir...@onetel.net wrote:
I don't have it yet, but bought it on eBay today from the seller
agilentused which is Agilent, and sells used/ex-demo units which
have been
On 1 September 2012 02:42, Said Jackson saidj...@aol.com wrote:
You could get our GPSTCXO eval kit.
It has a uBlox gps, supports NMEA GGA and RMC messages, has on-board USB, and
outputs a disciplined 10MHz with reasonably good phase noise. Two flies
captured in one.
Probably costs only as
I think 50% is the employee discount, at least back in the day.
I worked at a company that was one of the early users of Silvaco. The founder,
Ivan Pesic, bought all the gear for his start up at employee discount, then
started a company competing with HP TECAP. He got the network analyzer, the
On 8/31/12 11:35 PM, Hal Murray wrote:
The context is using the 60 Hz line for timing.
I'm feeding 60 Hz from a wall wart transformer into a modem control signal
that the kernel PPS stuff watches. Mostly, it works as expected, but
occasionally, it picks or drops a cycle.
In order to
IMO, you have an instrumentation issue. I don't think the power grid can
do anything like that.
YMMV,
-John
===
The context is using the 60 Hz line for timing.
I'm feeding 60 Hz from a wall wart transformer into a modem control signal
that the kernel PPS stuff watches.
I agree: I don't think this is possible on a power line. Better to use a
second sampling unit to check.
On Sat, Sep 1, 2012 at 3:30 PM, J. Forster j...@quikus.com wrote:
IMO, you have an instrumentation issue. I don't think the power grid can
do anything like that.
YMMV,
-John
I'd try to beg or borrow a line dsturbance monitor. To me, it looks like a
SW issue, BTW. Perhaps something like an interrupt service routine crock.
FWIW,
-John
==
I agree: I don't think this is possible on a power line. Better to use a
second sampling unit to check.
On Sat,
More...
You might try logging the output of an audio oscillator, Even an HP 20
would work.
-John
=
I agree: I don't think this is possible on a power line. Better to use a
second sampling unit to check.
On Sat, Sep 1, 2012 at 3:30 PM, J. Forster j...@quikus.com wrote:
More... OOPS
You might try logging the output of an audio oscillator, Even an HP 200
would work.
-John
=
I agree: I don't think this is possible on a power line. Better to use a
second sampling unit to check.
On Sat, Sep 1, 2012 at 3:30 PM, J. Forster j...@quikus.com
I concur with John, the grid doesn't do that. To me it looks like line noise
and/or a software issue is causing your setup to give false results.I have
seen a lot of instrumentation get fooled by line noise, especially around zero
crossings. Measuring the power line accurately in the
IMO, you have an instrumentation issue. I don't think the power grid can
do anything like that.
YMMV,
-John
I agree. If this was happening on the grid by the time this blip had
traveled down the line to you it would have been so filtered through
transformers and other devices and you
I think monitoring a signal generator was the best idea presented. You always
need a baseline (sanity) test in any experiment.
___
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On 9/1/12 6:56 AM, Arthur Dent wrote:
IMO, you have an instrumentation issue. I don't think the power grid can
do anything like that.
YMMV,
-John
I agree. If this was happening on the grid by the time this blip had
traveled down the line to you it would have been so filtered through
Hi
Observing a curve and being able to compensate it are often two different
things. Hysteresis is one very obvious example. Another is simple sensor lag. A
some what less obvious one is that the temperature performance is also
influenced by the rate of change in temperature.
Here's another
On 9/1/12 8:32 AM, Bob Camp wrote:
Hi
Observing a curve and being able to compensate it are often two different
things. Hysteresis is one very obvious example. Another is simple sensor lag. A
some what less obvious one is that the temperature performance is also
influenced by the rate of
Hi
I suspect that a good IT cut would probably do better than an SC in either
application. In the deep space situation, a copper slug in a dewar sounds like
a reasonable addition to the design.
Bob
On Sep 1, 2012, at 11:53 AM, Jim Lux jim...@earthlink.net wrote:
On 9/1/12 8:32 AM, Bob Camp
Hal, where are you taking off the signal to the audio line?
At the low voltage wall wart or at the modem pin? - assuming
there's an isolation or dropping resistor.
I agree with others that the power company isn't doing this.
There would be inductive ringing. Can you confirm with another
wall wart
Perhaps a dumb question, but the wall wart is plugged into the wall, connected
directly to the grid? You aren't powering the wall wart through a UPS or some
type of inverter?
Tom
Sent from my HTC Inspire™ 4G on ATT
- Reply message -
From: Bill Hawkins b...@iaxs.net
To: 'Discussion of
In the second set it looks like the wrong input is being sampled at
times. Notice the offset is always the same. I have seen this happen a
lot with simple sampling programs. Even if this were real I doubt it
would cause false triggering of the clock. The pulse shown in the first
set would.
In message A25619B9FE5144D59D8C1FA34FC4D628@cyrus, Bill Hawkins writes:
I agree with others that the power company isn't doing this.
Not only are they not, but it also very obvious that the source is nearby,
since high-frequency components suffer very high damping in the grid.
My guess is an
Nope.
The rise/falls are far too fast for anything connected to the grid even if
in the same house. If the thing is on the output of a UPS with a rapidly
switched load, maybe.
Any big loads, even ohmic heaters, have some inductance. I don't see any
such influence.
Try an oscillator. I suggested
On 09/01/2012 05:53 PM, Jim Lux wrote:
On 9/1/12 8:32 AM, Bob Camp wrote:
Hi
Observing a curve and being able to compensate it are often two
different things. Hysteresis is one very obvious example. Another is
simple sensor lag. A some what less obvious one is that the
temperature performance
On 09/01/2012 10:57 PM, J. Forster wrote:
Nope.
The rise/falls are far too fast for anything connected to the grid even if
in the same house. If the thing is on the output of a UPS with a rapidly
switched load, maybe.
Any big loads, even ohmic heaters, have some inductance. I don't see any
On 09/01/2012 08:35 AM, Hal Murray wrote:
The context is using the 60 Hz line for timing.
I'm feeding 60 Hz from a wall wart transformer into a modem control signal
that the kernel PPS stuff watches. Mostly, it works as expected, but
occasionally, it picks or drops a cycle.
In order to
On 09/01/2012 02:17 PM, Magnus Danielson wrote:
On 09/01/2012 08:35 AM, Hal Murray wrote:
The context is using the 60 Hz line for timing.
I'm feeding 60 Hz from a wall wart transformer into a modem control
signal
that the kernel PPS stuff watches. Mostly, it works as expected, but
Firefox is notorious for screwing up audio in windows. I have had OS of
problems with this. I actually think its something o o with networking.
Sent from my iPad
On Sep 1, 2012, at 5:16 PM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote:
On 09/01/2012 02:17 PM, Magnus Danielson wrote:
On
On 9/1/12 11:00 AM, Bob Camp wrote:
Hi
I suspect that a good IT cut would probably do better than an SC in either
application. In the deep space situation, a copper slug in a dewar sounds like
a reasonable addition to the design.
If you're going to do dewars, then you're talking USOs for
Hi
True on the volume and weight. Not as much power as an OCXO since it's passive.
At 1x 2 x 0.5 you could fix the power and weight by using an EMXO. You still
would have more power than the TCXO, but no were near as much as the couple
watts a USO uses.
Bob
Bob
On Sep 1, 2012, at 10:41 PM,
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