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PS: Does anyone else miss the odd digest mail at times?
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Message: 4
Date: Mon, 28 Dec 2009 19:47:41 -0500
From: Bob Camp li...@cq.nu
Subject: Re: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement
Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dr. David Kirkby
Sent: 28 December 2009 23:22
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Can a quartz crystal go off by 2% ?
I'm on the so
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dr. David Kirkby
Sent: 28 December 2009 23:22
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Can a quartz crystal go off by 2% ?
I'm on the so-called 'Economy 7' electric in the UK, where I'm
Kirkby
Sent: 28 December 2009 23:22
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Can a quartz crystal go off by 2% ?
I'm on the so-called 'Economy 7' electric in the UK, where I'm supposed to
get
cheap electric from 0030 to 0730 - i.e. a 7 hour period when electricity
] On
Behalf Of Dr. David Kirkby
Sent: 28 December 2009 23:22
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Can a quartz crystal go off by 2% ?
I'm on the so-called 'Economy 7' electric in the UK, where I'm supposed to
get
cheap electric from 0030 to 0730 - i.e
I wonder how the power company changes the meter rate, based on the local
timer. Are there two different meters, with a separate circuit for cheap
loads?
Perhaps not, because you continue to run your computers without
interruption. OTOH, you said in the first posting, Sometimes we hear the
Hi Rob,
Actually they are controlled from a low bit-rate signal
phase-modulated onto Radio-4 long-wave (198KHz). If you have an SSB
or CW receiver that tunes down to that frequency, switch on the BFO
and look at the output on something like Spectrum Lab, and the phase
modulation is readily
at the
time clock.
D.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bill Hawkins
Sent: 29 December 2009 17:17
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Can a quartz crystal go off by 2% ?
I wonder
Rob Kimberley wrote:
AFIK a lot of the clocks were radio controlled from MSF Rugby (now Anthorn,
Cumbria). You would need to have some sort of automated system to
accommodate daylight savings switchovers in Spring and Autumn. That said, I
would have thought once synchronised, they would tick off
I'm on the so-called 'Economy 7' electric in the UK, where I'm supposed to get
cheap electric from 0030 to 0730 - i.e. a 7 hour period when electricity demand
is low. I'm no longer heating by electric, but do run some computers 24/7. It's
not totally clear whether this saves me money or costs
runs out.
Alan G3NYK
--- On Mon, 28/12/09, Dr. David Kirkby david.kir...@onetel.net wrote:
From: Dr. David Kirkby david.kir...@onetel.net
Subject: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: Monday, 28
a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Date: Monday, 28 December, 2009, 23:22
I'm on the so-called 'Economy 7'
electric in the UK, where I'm supposed to get cheap electric
from 0030 to 0730 - i.e. a 7 hour period when electricity
: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: Monday, 28 December, 2009, 23:22
I'm on the so-called 'Economy 7'
electric in the UK, where I'm supposed to get cheap electric
from 0030 to 0730 - i.e. a 7 hour period
Bruce Griffiths wrote:
If the trimmer in in series with the crystal and not shunted by another
capacitor then the crystal will no longer control the oscillator frequency.
0.1pF or 0.01pF in series with a tuning fork crystal instead of the
nominal value (20pf?) will make a singnificant
Hi
Even with a tuning fork crystal, anything past about 0.2% is a very large
changel. That's true for tuning and also true for normal aging.
I suspect that something mechanical has happened.
1) A cracked crystal - unlikely
2).An electro magnet in the driving circuit no longer firing fully.
wrote:
From: Dr. David Kirkby david.kir...@onetel.net
Subject: Re: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: Monday, 28 December, 2009, 23:58
ALAN MELIA wrote:
It is possible the crystal has succumbed
Bob Camp wrote:
Hi
Even with a tuning fork crystal, anything past about 0.2% is a very large
changel. That's true for tuning and also true for normal aging.
I suspect that something mechanical has happened.
1) A cracked crystal - unlikely
2).An electro magnet in the driving circuit no
more than usual.
Dave
--- On Mon, 28/12/09, Dr. David Kirkby david.kir...@onetel.net wrote:
From: Dr. David Kirkby david.kir...@onetel.net
Subject: Re: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Date: Monday
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