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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
LoadBase 3.0 Mobile w/G7 BC Test Results
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<blockquote data-quote="jrs" data-source="post: 382243" data-attributes="member: 24554"><p>Brian and all,</p><p> </p><p>The microphone downrange is an excellent idea, but getting the real time of arrival of the bullet downrange via a TCP/IP based LAN is somewhat problematical as the protocol is likely to add a variable delay. (Now I've got to go figure out if the delay variability is significant!)</p><p> </p><p>I'm thinking I would need to sync up a pair of clocks using NTP and then read microseconds between events from the clocks on each end, but I may be over-engineering for the scale of events. Would require dedicated equipment that I can design and build but don't have 'off the shelf' at this point ... unless the clock in the downrange router will do it ... hummm</p><p> </p><p>Brian, how do you account for network delays? Do you get resolution greater than millisecond?</p><p> </p><p>Shouldn't we start a new thread for this discussion? Call it something like range instrumentation ?</p><p> </p><p>John Snell</p><p><a href="mailto:jsnell@twincedars.us">jsnell@twincedars.us</a></p></blockquote><p></p>
[QUOTE="jrs, post: 382243, member: 24554"] Brian and all, The microphone downrange is an excellent idea, but getting the real time of arrival of the bullet downrange via a TCP/IP based LAN is somewhat problematical as the protocol is likely to add a variable delay. (Now I've got to go figure out if the delay variability is significant!) I'm thinking I would need to sync up a pair of clocks using NTP and then read microseconds between events from the clocks on each end, but I may be over-engineering for the scale of events. Would require dedicated equipment that I can design and build but don't have 'off the shelf' at this point ... unless the clock in the downrange router will do it ... hummm Brian, how do you account for network delays? Do you get resolution greater than millisecond? Shouldn't we start a new thread for this discussion? Call it something like range instrumentation ? John Snell [EMAIL="jsnell@twincedars.us"]jsnell@twincedars.us[/EMAIL] [/QUOTE]
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LoadBase 3.0 Mobile w/G7 BC Test Results
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