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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Car clock
How does my car clock work? It cannot be quartz or radio controlled
as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? |
#2
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Car clock
In article ,
Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
#3
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Car clock
On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles
wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? |
#4
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Car clock
Scott wrote:
On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? When cheap crystals and other components are used. Crystals vibrate at a regular frequency, not an absolute frequency. Which frequency and how narrow the frequency spread is is what manufacturers pay for. I thought it was supposed to be accurate to one second in so many thousand years. Nothing like that good but some meet the makers specs better than others. Can the crystal be replaced? I dare say in theory. How easy that will be to do in any particular car and whether its worth the trouble is harder to say. Tim -- Please don't feed the trolls |
#5
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Car clock
In message , Scott
writes On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. I think you're thinking of rubidium - as in rubidium atomic clock. https://en.wikipedia.org/wiki/Rubidium_standard Can the crystal be replaced? I'm sure it can - but replacing it with a rubidium frequency standard might prove quite a challenge! -- Ian |
#6
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Car clock
In article ,
Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? That depends on the quality of the crystal and the control of its operating temperature. Really high accuracy crystals probably cost as mucha a car. -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
#7
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Car clock
charles brought next idea :
That depends on the quality of the crystal and the control of its operating temperature. Really high accuracy crystals probably cost as mucha a car. Or use a normal crystal, but in a temperature controlled oven. The usual way, is have the clock/watch correct itself once per day, by receiving MSF. |
#8
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Car clock
"Scott" wrote in message ... On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? All of them. I thought it was supposed to be accurate to one second in so many thousand years. Not with commercial grade clocks. Can the crystal be replaced? Yes, but that wont fix the problem. |
#9
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Car clock
Scott wrote:
On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? The first 32.768kHz watch crystal that shows up on Farnell has a tolerance of +/-20ppm: http://www.farnell.com/datasheets/1718754.pdf There are 86400 seconds in a day, therefo 86400*(20/1000000) = 1.728 seconds/day it could be either fast or slow by that amount. That's 10.5 hours/year. The frequency stabilty is also affected by temperature - for this one that would be another -20ppm across the kinds of temperature ranges a car might be exposed to, so the same time skew again if the tolerance happened to start at -20ppm. I today dug out an old digital camera that I haven't used for ~5 years. Its clock was half an hour fast. That's not bad going, all things considered. Theo |
#10
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On 22/03/2021 19:41, Scott wrote:
In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? Maybe it can. But they trim it until it's "close enough". That's all. (My watch runs fast) Andy |
#11
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Car clock
On Mon, 22 Mar 2021 19:41:54 +0000, Scott
wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? Accuracy is what you pay for. I have had a few £1 rubber watches off ebay, which either gain or lose 1 minute a day. Probably factory rejects. So I bought a dozen crystals of specified accuracy for under £2 the lot, which when installed in the watches rendered them decent timekeepers. -- Dave W |
#12
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Car clock
In article , Dave W
writes On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? Accuracy is what you pay for. I have had a few £1 rubber watches off ebay, which either gain or lose 1 minute a day. Probably factory rejects. So I bought a dozen crystals of specified accuracy for under £2 the lot, which when installed in the watches rendered them decent timekeepers. My Rolex actually gains slightly - well they are clockwork after all. -- bert |
#13
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bert wrote:
In article , Dave W writes On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? Accuracy is what you pay for. I have had a few £1 rubber watches off ebay, which either gain or lose 1 minute a day. Probably factory rejects. So I bought a dozen crystals of specified accuracy for under £2 the lot, which when installed in the watches rendered them decent timekeepers. My Rolex actually gains slightly - well they are clockwork after all. There's a machine for adjusting clockwork ones. The device here is digital and not quite the same. https://diywatch.club/en/blog/how-to...-a-timegrapher However, the output is made to look similar to the old one. The old one used a chart recorder. If the chart pen drew a straight line down the chart paper, the movement was properly adjusted. If it went off on a diagonal, to the left or right, it needed a bit of tweaking. It's possible the chart recorder version in the lab, had vacuum tubes in it. I presume if the chart pen wiggled, it meant something was worn and needed replacement. I didn't try the machine out, but the guy in the lab said some of the other staff used to come in and use the machine for their watches. The machine was meant for adjusting wind-up data recorders for the research ship. For digital watches, I'm sure some crafty person would attempt to make the output look like the timegrapher. But a basic frequency counter would be all that was really needed. And a frequency counter with a "good-enough" reference inside. Not all frequency counters have good reference oscillators inside. Some are just dreadful. As long as they have the coax connector for 10MHz input, you can connect an external reference. And then the reference likely costs more than the frequency counter. Paul |
#14
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Car clock
On 24/03/2021 23:53, bert wrote:
In article , Dave W writes On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Â* Scott wrote: How does my car clock work?Â* It cannot be quartz or radio controlled as it runs slightly fast.Â* It cannot be synchronous because the supply is DC.Â* Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances?Â* I thought it was supposed to be accurate to one second in so many thousand years.Â* Can the crystal be replaced? Accuracy is what you pay for. I have had a few £1 rubber watches off ebay, which either gain or lose 1 minute a day. Probably factory rejects. So I bought a dozen crystals of specified accuracy for under £2 the lot, which when installed in the watches rendered them decent timekeepers. My Rolex actually gains slightly - well they are clockwork after all. Officially certified Rolexes are usually only guaranteed to keep time to -4+6 seconds a day. (I think there are some "special" ones guaranteed to -2+2.) -- Max Demian |
#15
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Car clock
In article ,
Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? Don't you have any at home? They are normally minutes out each time you have to re-set for BST, etc. -- *If vegetable oil comes from vegetables, where does baby oil come from? * Dave Plowman London SW To e-mail, change noise into sound. |
#16
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Car clock
In message , Chris Hogg
writes On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. I doubt if many present-day watches actually have a trimmer capacitor, However, the first one I had (in the 1970s, and bought from a guy at work who seemed to be able to get his hands on a supply) DID have a trimmer. With a bit of trial and error, I got the time accurate to a few seconds a month. -- Ian |
#17
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Car clock
"Chris Hogg" wrote in message ... On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, Yes. But they still vary with temperature. and observing the result using an accurate oscilloscope. Nope, not even a frequency counter because they arent that accurate. You adjust it by seeing if the clock gains or loses. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. It wont work anyway, it will still be temperature sensitive with commercial grade clocks. You need a temperature controlled micro oven for the xtal and that's not economic. You can get clocks that use the gps system to keep accurate time now and ones that use the mobile phone system. |
#18
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Car clock
After serious thinking %% wrote :
Nope, not even a frequency counter because they arent that accurate. You adjust it by seeing if the clock gains or loses. Actually they do calibrate them, against a very accurate and stable crystal timebase in watch repairers. |
#19
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Car clock
On 22/03/2021 21:38, Harry Bloomfield wrote:
After serious thinking %% wrote : Nope, not even a frequency counter because they arent that accurate. You adjust it by seeing if the clock gains or loses. Actually they do calibrate them, against a very accurate and stable crystal timebase in watch repairers. Yebbut a watch runs at a comparatively constant temperature. -- Cheers Clive |
#20
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More Heavy Trolling by Senile Nym-Shifting Rodent Speed!
On Tue, 23 Mar 2021 08:31:56 +1100, %%, better known as cantankerous
trolling senile geezer Rodent Speed, wrote: FLUSH the trolling senile asshole's latest troll**** unread |
#21
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Car clock
On 22/03/2021 20:03, Chris Hogg wrote:
I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. They drift by x parts per million per degree celcius hence why with a crystal if you wanted repeatable accuracy you put it in temperature controlled environment. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#22
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Car clock
On 22/03/2021 21:57, alan_m wrote:
On 22/03/2021 20:03, Chris Hogg wrote: I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. They drift by x parts per million per degree celcius hence why with a crystal if you wanted repeatable accuracy you put it in temperature controlled environment. Clock crystals are generally cut so that their linear temperature coefficient is almost zero and there is a tiny quadratic variation with ambient temperature typically -10ppm at about 10 and 40C spot on at 25C. Figure 6 in the TI datasheet: https://www.ti.com/lit/an/slaa322d/slaa322d.pdf It is pretty easy to get within 5ppm on average over that range. Cars in winter can get both hotter and colder though. -- Regards, Martin Brown |
#23
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Car clock
On 22/03/2021 20:03, Chris Hogg wrote:
On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. No oscilloscope is good enough - you need a quality frequency counter -- Of what good are dead warriors? €¦ Warriors are those who desire battle more than peace. Those who seek battle despite peace. Those who thump their spears on the ground and talk of honor. Those who leap high the battle dance and dream of glory €¦ The good of dead warriors, Mother, is that they are dead. Sheri S Tepper: The Awakeners. |
#24
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Car clock
"The Natural Philosopher" wrote in message ... On 22/03/2021 20:03, Chris Hogg wrote: On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. No oscilloscope is good enough - you need a quality frequency counter Even that isnt good enough. |
#25
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Car clock
On Tue, 23 Mar 2021 11:45:14 +1100, "%%" wrote:
"The Natural Philosopher" wrote in message ... On 22/03/2021 20:03, Chris Hogg wrote: On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances? I thought it was supposed to be accurate to one second in so many thousand years. Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. No oscilloscope is good enough Not by itself but if you have an accurate reference frequency and access to the X amplifier (can you still do that with modern scopes?), a scope can be a very sensitive indicator. - you need a quality frequency counter Even that isnt good enough. Modern ones are. https://www.keysight.com/us/en/asset.../5990-6283.pdf In fact, even the early reciprocal counters from 40 years ago were more than up to the job. |
#26
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Car clock
On 23/03/2021 00:45, %% wrote:
"The Natural Philosopher" wrote in message ... On 22/03/2021 20:03, Chris Hogg wrote: On Mon, 22 Mar 2021 19:41:54 +0000, Scott wrote: On Mon, 22 Mar 2021 19:17:19 +0000 (GMT), charles wrote: In article , Â*Â* Scott wrote: How does my car clock work?Â* It cannot be quartz or radio controlled as it runs slightly fast.Â* It cannot be synchronous because the supply is DC.Â* Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, In what circumstances?Â* I thought it was supposed to be accurate to one second in so many thousand years.Â* Can the crystal be replaced? I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. No oscilloscope is good enough - you need a quality frequency counter Even that isnt good enough. Yes, it can be It simply needs a better internal oscillator, temerature compensated than the one it is testing and enough electronics to display very small differences. and a stable environment and regular calibration. Needless to say, they are not cheap. -- €œI know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives.€ €• Leo Tolstoy |
#27
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More Heavy Trolling by Senile Nym-Shifting Rodent Speed!
On Tue, 23 Mar 2021 11:45:14 +1100, %%, better known as cantankerous
trolling senile geezer Rodent Speed, wrote: No oscilloscope is good enough - you need a quality frequency counter Even that isnt good enough. In auto-contradicting mode again, you subnormal senile sociopath? BG -- John addressing the senile Australian pest: "You are a complete idiot. But you make me larf. LOL" MID: |
#28
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Car clock
In article ,
Chris Hogg wrote: I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. Even then, a car is a pretty hostile place, because the temperature varies so much. Any oscillator needs a constant temperature for best results. -- *I don't believe in astrology. I am a Sagittarius and we're very skeptical. Dave Plowman London SW To e-mail, change noise into sound. |
#29
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On 23/03/2021 00:50, Dave Plowman (News) wrote:
In article , Chris Hogg wrote: I have always thought that some quartz crystal oscillator circuits can be fine-tuned a few cps either side of the principal frequency, by way of a simple variable capacitor, and observing the result using an accurate oscilloscope. I may be wrong, and even if I'm not, I wouldn't recommend trying it unless you're going to scrap the oscillator anyway and making a complete balls-up won't matter. Even then, a car is a pretty hostile place, because the temperature varies so much. Any oscillator needs a constant temperature for best results. That might be true of the components surrounding the crystal but crystals are cut along a plane of the crystal geometry such that temperature has a small effect on frequency change. You will often hear of an AT cut: https://txccrystal.com/term.html https://www.iqdfrequencyproducts.com...artz-crystals/ |
#30
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Fredxx formulated on Tuesday :
That might be true of the components surrounding the crystal but crystals are cut along a plane of the crystal geometry such that temperature has a small effect on frequency change. You will often hear of an AT cut: https://txccrystal.com/term.html ...and they all change frequency a little, as they age and all need a frequency trimmer to enable them to be adjusted to an exact frequency. The trimming components are as critical as the crystal, if best accuracy is aimed for. |
#31
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Car clock
On 22/03/2021 19:17, charles wrote:
In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, there may be a teeny adjustable tuning capacitor inside -- Of what good are dead warriors? €¦ Warriors are those who desire battle more than peace. Those who seek battle despite peace. Those who thump their spears on the ground and talk of honor. Those who leap high the battle dance and dream of glory €¦ The good of dead warriors, Mother, is that they are dead. Sheri S Tepper: The Awakeners. |
#32
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Car clock
In article ,
charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, Quite. Depends on how well made it is. Car electric clocks were around before quartz too. Pure electric were pretty poor time keepers. Later on came clockwork ones, electrically wound. They were rather better. Many these days use the car radio RDS signal. -- *Heart attacks... God's revenge for eating his animal friends Dave Plowman London SW To e-mail, change noise into sound. |
#33
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"Dave Plowman (News)" wrote in message ... In article , charles wrote: In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, Quite. Depends on how well made it is. Nope, how well its tweaked at manufacture of the clock. Car electric clocks were around before quartz too. Pure electric were pretty poor time keepers. Later on came clockwork ones, electrically wound. They were rather better. Many these days use the car radio RDS signal. |
#34
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Lonely Obnoxious Cantankerous Auto-contradicting Senile Ozzie Troll Alert!
On Tue, 23 Mar 2021 14:07:15 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Quite. Depends on how well made it is. Nope, how well its tweaked at manufacture of the clock. LOL Auto-contradicting senile twit! -- Kerr-Mudd,John addressing the auto-contradicting senile cretin: "Auto-contradictor Rod is back! (in the KF)" MID: |
#35
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Dave Plowman (News) has brought this to us :
Many these days use the car radio RDS signal. Mine does - always correct ;-) My landline phone system maintains the time and date, for logging any calls and displays the time when 'parked'. It doesn't get used very much and I notice it drifts quite a lot. That syncs itself with any incoming or outgoing call. |
#36
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Car clock
On Tue, 23 Mar 2021 07:31:43 +0000, Harry Bloomfield, Esq. wrote:
Dave Plowman (News) has brought this to us : Many these days use the car radio RDS signal. Mine does - always correct ;-) My landline phone system maintains the time and date, for logging any calls and displays the time when 'parked'. It doesn't get used very much and I notice it drifts quite a lot. That syncs itself with any incoming or outgoing call. Our phones sync with the NTP server! -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
#37
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Car clock
On 23/03/2021 07:31, Harry Bloomfield wrote:
Dave Plowman (News) has brought this to us : Many these days use the car radio RDS signal. Mine does - always correct ;-) My landline phone system maintains the time and date, for logging any calls and displays the time when 'parked'. It doesn't get used very much and I notice it drifts quite a lot. That syncs itself with any incoming or outgoing call. You could always dial 17070 and select the ringback test. That updates your phone or caller-id box with the correct time |
#38
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Car clock
On 23/03/2021 15:17, Andrew wrote:
On 23/03/2021 07:31, Harry Bloomfield wrote: Dave Plowman (News) has brought this to us : Many these days use the car radio RDS signal. Mine does - always correct ;-) My landline phone system maintains the time and date, for logging any calls and displays the time when 'parked'. It doesn't get used very much and I notice it drifts quite a lot. That syncs itself with any incoming or outgoing call. You could always dial 17070 and select the ringback test. That updates your phone or caller-id box with the correct time what happened to 1471 ? ... |
#39
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Car clock
Not a lot of detail, analogue or digital, and incidentally, I had a so
called radio clock that in some places in the house ran fast since it lost lock to its signal which apparently came from Germany. Brian -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "charles" wrote in message ... In article , Scott wrote: How does my car clock work? It cannot be quartz or radio controlled as it runs slightly fast. It cannot be synchronous because the supply is DC. Is there any form of adjustment to get it to run to time? quartz can run fast - or slow, -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
#40
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Car clock
In article , Brian Gaff \(Sofa\)
wrote: Not a lot of detail, analogue or digital, and incidentally, I had a so called radio clock that in some places in the house ran fast since it lost lock to its signal which apparently came from Germany. Brian I, too, have a clock, bought in Lidl, which receives the German time service. With my wris****ch I can choose which time service I want to receive. The outdoor one on our Village Hall also uses the German time service. -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
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