[time-nuts] GPSDO Alternatives

Bob Camp lists at rtty.us
Fri Dec 7 12:27:03 UTC 2012


Hi

That is an impressive hourglass. In the context of the thought experiment "swap offer" - no, mine is not a work of art. It's only value is as a time keeper. 

Bob

On Dec 6, 2012, at 10:37 PM, DaveH <info at blackmountainforge.com> wrote:

> If you had an Ikepod, I might be interested.
> 
> http://www.ablogtowatch.com/ikepod-hourglass-time-for-art/
> 
> http://www.hodinkee.com/blog/2011/3/29/the-ikepod-hourglass-by-marc-newson-q
> uite-possibly-the-coole.html
> 
> http://www.ikepod.com/
> 
> Dave 
> 
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Camp
>> Sent: Thursday, December 06, 2012 18:23
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] GPSDO Alternatives
>> 
>> Hi
>> 
>> Here's another way to look at this:
>> 
>> An hourglass full of sand (with some attention) and a cesium 
>> standard are both ways to answer the question "what time is 
>> it?". Let's say you need a new $40,000 tube replacement in 
>> your 5371 and management asks "what else can we do?".  An 
>> hour glass  is indeed a "something else we can do". They both 
>> deliver an answer to the time of day question. Without 
>> defining what you actually *need* to do, they are both valid 
>> approaches. 
>> 
>> The problem comes when you look at the $40,000 repair charge 
>> and decide that building an hour glass is a lot cheaper. 
>> While that's true, it's far from the whole story. One way to 
>> quickly work some of this out is a simple swap proposition. 
>> Would anybody on the list trade their (working) cesium for my 
>> (working) hourglass? I'll pay shipping..
>> 
>> Bob
>> 
>> On Dec 6, 2012, at 9:03 PM, Mark Sims <holrum at hotmail.com> wrote:
>> 
>>> 
>>> I think only TIMER2 on the AVR has the clk/4 limitation.   
>> The other timers can count at full speed.    I know that I 
>> have counted at 8-12 MHz before...
>>> 
>>> 		 	   		  
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