Author Topic: FX Radar Chronograph followup  (Read 624 times)

Alan

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FX Radar Chronograph followup
« on: March 03, 2020, 05:29:39 AM »
There are two issues to be aware of when using the FX Chronograph. First, the unit comes with a barrel-mounting bracket which replaces the camera mount (one with 1/4X20 threaded port). When so mounted on some weapons, this can cause an error in the recored velocity. The reason is, the microphone which keys the unit is very sensitive. When the hammer falls, the jarring can cause the unit to read the velocity to read low (keyed too early). Doesn't happen every time, but enough to be disconcerting. A related issue is background noise levels. If it is too high, the unit won't trigger at all, which is also disconcerting. I solved the first issue (see the photo and verbiage below), the solution for the second issue is obvious.

This is a home-made bracket, made out of some self-reenforcing, acetal plastic. It utilizes the built-in, clip-on, bracket on the bottom of the unit. Remembering the microphone is on the left side of the FX radar, I set the unit just to the right of center, below the barrel within 6 inches of the muzzle. So set up, the readouts are more exact (in closer agreement with the Labradar used as a constant).

« Last Edit: March 03, 2020, 01:18:10 PM by Alan »


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Alan

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