[time-nuts] A real world project need for timing accuracy...

Don Latham djl at montana.com
Tue Nov 2 15:58:35 UTC 2010


Quite so, William. All the factors you mentioned are important and have to
be measured.
Don

William H. Fite
> Exactly, jimlux, this is readily possible.
>
> I find it interesting that no one has commented, one way or the other, on
> the uncontrollable environmental variables I mentioned.  Is this just
> about
> technology and not about validity?
>
>
>
>
> On Tue, Nov 2, 2010 at 9:28 AM, jimlux <jimlux at earthlink.net> wrote:
>
>> Bob Camp wrote:
>>
>>> Hi
>>>
>>> Ok, I mis-understood the question.
>>>
>>> In my experience, you can have big buck (as in many thousands of
>>> dollars)
>>> optics and not see .2" holes at 800 yards. The bull's eye is a *lot*
>>> bigger
>>> than the hole the bullet made.
>>>
>>> 0.2" at 2400 ft is about 0.08 milliradian.. or 0.3 minutes of arc.
>>> Your
>> eye can resolve about 1 minute of arc... I'm not questioning your
>> experience, but it seem that even a moderate power scope should allow
>> you to
>> see the holes.  As I recall, the Rayleigh limit for resolution is
>> something
>> like 0.7 milliradian/mm of aperture, so 10-15 mm aperture would be in
>> the
>> right ballpark..
>>
>> I can imagine needing more aperture than 3", though.. you're not
>> interested
>> in resolving a star, but something more akin to separating dots.
>>
>>
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-- 
"Neither the voice of authority nor the weight of reason and argument are
as significant as experiment, for thence comes quiet to the mind."
R. Bacon


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com




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