What is with the FX chrono V2 ?

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Peashooter

Peashooter

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Apr 9, 2021
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My friend got one of these, and TBH i am stomped.

It will extremely often miss a shot / several shots in a row completely.
It will some times ( like 1 in every 5 shots ) list a speed for a shot at least 1/4 of the actual speed of 970 FPS
And it have a couple of times barked out a speed of over 3000 FPS

I think my friend is lucky the used chrono are just from December and he got at a very low price, which seem to be for good reason

The damn thing are of course fully charged and fully updated ( with the extended sleep update FW )

Needless to say my old FX pocket chrono on his rifle perform as it should.
 
nervoustrig said:
Any chance he is shooting in close proximity to a structure? A nearby wall produces reflections that can confuse the receiver.

The fact your chrono works for him suggests his is faulty but I would at least try it again from an open space.
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I was going to say probably user error which is par for the course with fx gear. Odd reflection returns, software updates, radar position in the area. It isn't supposed to read supersonic stuff well anyhow. Eliminate the easy variables first. I also doubt the internals have changed much and it probably a better case and some software updates that have made my v1 WAY better than it used to be

Odd reflections give me missed pickups the most, how the radar is pointed is important. I've had mine pick up flies before too which is fun.
 
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No we are shooting from our shed, with end of rifles and chronos outside of it, and shooting across open field aside for the backstops and targets here and here, most prominent the end of the 20 foot container that is back stop at 55 M distance.

My old model FX chrono have absolutely 0 problems.
We have tried to mount his chrono all manner of places on his rifle, from 3" behind the muzzle to about a foot back on the rail system.

We have not tried his chron on my rifle as i feel that is invane, and i am pretty sure there is no user error, i have used a FX pocket chrono for like 5 years now and know well what they can and can not do.

I dont get how it will call out speeds that is either way faster than the 960 FPS he shoot, or lower than the range for the particular chrono profile he use.
And it is completely randon though it do seem like every 3 ( counted / measured ) shot being called out as super slow is a favorite.

I have tried to adjust ( calibrate ) the chrono in all of its range from -2.0 to 2.0 but it dont really do much for it

On my rifles i have always had my old chrono on the very back of the moderator, it have always worked just fine there, but as i said we have tried just about eveny mm of his moderator and shroud further back
 
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No we have not tried without the moderator i have at admit, it is the samme Finnish made powder burner moderator we use ( made for 22 LR and .17 HMR )

MY friend is going to the dealer tomorrow to talk to them.


Layout of range ( areal view )

new-shack-jpg.418711


Video of bench / shooter layout.


Picture ( staged ) of all lanes occupied, just some rifles thrown in there.
Friends DRS in Chassis rifle in front we have a hard time getting chrono measurements on, well using his V2 chrono my old one work just fine on it.

img_20250228_135720-jpg.543285
 
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what caliber because there is an adjustment in the chrono settings as I've heard others have had the same issue.
i have one v2 and works flawless . found this on an earlier post


I've found two things that can affect it. One is having it set for the wrong velocity range. If velocities go over or under the range you have it set for in its profile then you won't get a reading. The other is sensitivity. The default setting is 20. On some guns, particularly. 177s and bb guns I've had to go down to 10 or 0. It's best to keep it as high as possible though because with it set really low any rapid movement will cause a false reading. The false reading are typically very obvious however.
 
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Okay so i have a update to this predicament, and it is of course all to blame on FX.

Now before you sigh and point your finger at the screen and say HATER, let me tell you there is a twist, a rather weird twist.

So my friend got the chrono replaced at the store, but the problem is exactly the same.
SO i told him to expand testing paradigm, and so he have done.

The V2 chrono work on all of his rifles and pistols, BUT ! it will still not work on the DRS in Aeon chassis, it will however read its shots just fine if the chrono is not in any way touching the rifle. ( placed beside barrel / under barrel and even above barrel, but it can not touch the rifle.
But as we already knew mounted anywhere on the rifle and it will just not work.

So the FX to blame the DRS rifle not the chrono, though i will have to admit ill be damned if i can figure out why, he have of course also tried without moderator ASO
Even with the chrono attached to the damn scope

So. I would very much like to hear a explanation to why the chrono do not work on a FX DRS but all other rifles, and last visitor to the shed also had a V2 working on his impact 3 or 4
But on my friends DRS,,,,,, it will not at all work, everywhere else rock solid.


Only thing not yet tried is put DRS classic in original Synth stock.
 
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Peashooter said:
Okay so i have a update to this predicament, and it is of course all to blame on FX.

Now before you sigh and point your finger at the screen and say HATER, let me tell you there is a twist, a rather weird twist.

So my friend got the chrono replaced at the store, but the problem is exactly the same.
SO i told him to expand testing paradigm, and so he have done.

The V2 chrono work on all of his rifles and pistols, BUT ! it will still not work on the DRS in Aeon chassis, it will however read its shots just fine if the chrono is not in any way touching the rifle. ( placed beside barrel / under barrel and even above barrel, but it can not touch the rifle.
But as we already knew mounted anywhere on the rifle and it will just not work.

So the FX to blame the DRS rifle not the chrono, though i will have to admit ill be damned if i can figure out why, he have of course also tried without moderator ASO
Even with the chrono attached to the damn scope

So. I would very much like to hear a explanation to why the chrono do not work on a FX DRS but all other rifles, and last visitor to the shed also had a V2 working on his impact 3 or 4
But on my friends DRS,,,,,, it will not at all work, everywhere else rock solid.


Only thing not yet tried is put DRS classic in original Synth stock.
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Is it possible the metal AERON chassis is interfering with the radar signal?
 
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I dont think so CUZ we have tried to mount it everywhere in front of the chassis too, only angle there we have not tried is on top of the barrel CUZ it would then be in the way of the scope, but to the sides or under barrel tried everywhere in 1/2" increments.

On the other rifles you just " throw " it on and its just fine, And BTW 2 of them are also tank around barrel as it is snowpeak M30 rifles.
 
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I will have to admit looking at the end of my friends rifle as he shoot it, it do seem to " whip " around a lot for a measly .177 rifle, but my own Two do it too though i think not as much.
His accuracy seem to be fine though, at least he sound a lot more happy shooting long range now, i can not say i have much more luck hitting the top smallest paddle on the dueling tree that is now put up at 95 or so yards.
I will try his chrono on my rifle on Thursday as that and Friday are this end of week go shooting days, Saturday way too windy.
 
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I have the same issue with .177 and a v2. It’s more about the ammo than the rifle. It reads JSB KO perfectly fine, NSA only missing a few here and there but getting it to read HN is crazy. 19 out of 20 tried positions will not register ANY but then you find the position/angle and suddenly it registers them all. On the V2 you CANNOT adjust the sensitivity, the option is disabled in the app when you select the V2. Which is BS but that’s what they decided to do… .22 and larger I can have it sitting on the bench, at whatever weird angle, 15 inches away from the muzzle or in front of it, left, right or wherever it’ll register all shots and precise…
 
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Okay so here is the final chapter in the FX V2 chrono saga.

So we found a 95% solution, and the chrono will read most shots on the DRS and generally give the correct speeds, only a few lower speeds called out by it. ( mounted just behind the moderator which is the same diameter as the barrel aside for maybe 1-2 mm smaller MOD )
And the trick,,,,,, Well mount the chrono upside down to the barrel, meaning the arch in the top of the chrono is now touching the barrel and not the way you are supposed to do it.

Doing it the right / FX way well a lot of shots get 0 speed called for them and many get the low / wrong speed called,,,,,, quite a significant difference in the behaviour of the chrono with the 2 ways of mounting it.

So this is how the saga of the strange FX chrono V2 end, we can not go any further as that will entail a loss of money and a dead chrono.
And really i can not see any other things we can try ( this is with the default setting )
We are both simple men, if some one / some thing is making too much BS, we will distance ourself from it, or destroy it in a fit of Berserker rage.
 
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You need to adjust the sensitivity settings. I had the same issues last fall with a customers unit. You also have to hold still for the shot, think extended follow through. Also, in the setting on the app you can adjust the fps window to closer match what your guns are shooting. Also, anything under 600fps(I know, it's set for 500fps, but gets intermittent readings under 600, and over 1000fps.) Anyway, that's what I've got for you. Oh, and I've never mounted the unit to the gun, always directly under, or next to as you have mentioned. Which makes sense considering how sensitive it needs to be set to read .177 and .22.

One last thing, how much of a charge it has makes a Huge difference. Anyhting under %25-%30 power and it starts acting up.
 
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I think you are right, i suspect the V2 have a narrower radar beam VS my old model which work 100 % on my friends DRS.
Where the V2 is now under the barrel is also where i have my V1, though i do generally just put it somewhere on the back half of my moderator.

We are shooting Zan slugs at the Zan speed of 950 - 980, ATM my friends average 976 over a 20 shot string with a very small fluctuation in speed. the regulator for sure work well.
we are going to dial it back a little in next outing, i do think it is a bit too hot for his particular FX barrel, shooting for 965 - 970 average.

It is funny though the chrono work on all of his other rifles, no 0 readings there or slow readings 100 % good stuff.

Also going to try that chrono on my Two of course.
 
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humbled.ag said:
You need to adjust the sensitivity settings. I had the same issues last fall with a customers unit. You also have to hold still for the shot, think extended follow through. Also, in the setting on the app you can adjust the fps window to closer match what your guns are shooting. Also, anything under 600fps(I know, it's set for 500fps, but gets intermittent readings under 600, and over 1000fps.) Anyway, that's what I've got for you. Oh, and I've never mounted the unit to the gun, always directly under, or next to as you have mentioned. Which makes sense considering how sensitive it needs to be set to read .177 and .22.

One last thing, how much of a charge it has makes a Huge difference. Anyhting under %25-%30 power and it starts acting up.
Click to expand...
How do you adjust the sensitivity of v2 (I know how for the v1, but for the v2 it seems different?!)?
 
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In the settings options, you'll see a menu selection CALIBRATE - ADVANCED. This is where you set the sensitivity. For the one I was using, -1.0 did the trick. Mind you, I test down a narrow hall, so turning down the sensitivity worked for me. Otherwise, and movement would be picked up and recorded, including flies passing through the radar cone.
 
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