Labradar help

[KBC]

Hey any tips getting a Labradar working for archery? I don’t have an external mic for it but maybe that’s my problem. I couldn’t get it to pick anything up. Trigger is set at 1, I tried both options for the trigger as well.
Thanks

 

[Shooter Mike]

This is what you will want for the LabRadar - also for use with suppressed rifles:

Labradar Trigger Gen 2

This is the gen two trigger for the LabRadar chronograph. It will work on anything from a 22LR to a big bore rifles. The trigger works great with suppressors and crowded ranges. The new, removable …

jklprecision.com

 

[Billy Goat]

External trigger/mic.

And set to archery.

 

[camelcluch]

Triston at Precision Cut Archery has a diy system that works well. He uses a cheap clamp of some sort to attach it to the bow.

 

[KBC]

Cool thanks. I was gonna sign up for precision cut once I got this thing working

 

[Herrdoberman]

Bought the low noise trigger that labradar sells and it registered 4 of around 30 shot.

The doppler got all the shots, any insight ?

 

[Billy Goat]

Bought the low noise trigger that labradar sells and it registered 4 of around 30 shot.

The doppler got all the shots, any insight ?

Set to archery?
Aimed correctly at target?

With the correct settings, and using the external mic, I don't recall having much issue at all.

What are you calling the doppler?

 

[Herrdoberman]

Set to archery?
Aimed correctly at target?

With the correct settings, and using the external mic, I don't recall having much issue at all.

What are you calling the doppler?

Set to archery, probably aimed properply at a 4x4 target.

I have the laradar V1 and in the menu there is an option for doppler or trigger.

When I use the mic I set it it to trigger, am I missing something here ?

Thanks for the help.

 

[Billy Goat]

Set to archery, probably aimed properply at a 4x4 target.

I have the laradar V1 and in the menu there is an option for doppler or trigger.

When I use the mic I set it it to trigger, am I missing something here ?

Thanks for the help.

Seems like you have things correct.

I haven't used mine in a little while.

Location of the mic maybe? Move it around some on the riser? How far away is the target? I don't think I have used it for a target less than 25 yards away or so.

 

[Herrdoberman]

Tested the mic on my pc it works, also armed the radar and tapped the mic and orange light blink.

Target was around 77 yards, I read the manual again and go back to testing.

Everything seems to work so the problem is most probably me.

Thanks again Sir.

 

[Billy Goat]

Tested the mic on my pc it works, also armed the radar and tapped the mic and orange light blink.

Target was around 77 yards, I read the manual again and go back to testing.

Everything seems to work so the problem is most probably me.

Thanks again Sir.

At 77 yards, depending on the speed, might have trouble picking it up.


I was able to use mine at that distance, or 75 yards maybe? but was upper 290's fps. I could see if you were in the 260's it might have trouble picking it up. Arrow getting above the radar path until its further out. That's just a guess tho, don't know exactly how wide the doppler band is.

 

[KBC]

I got mine working with an external mic. I read a tip to tape a short piece of arrow shaft in the V at the top you use to aim it. I was way off aiming it without. Once I aimed it looking through the arrow shaft, it worked perfectly

 

[Johnboy]

Bought the low noise trigger that labradar sells and it registered 4 of around 30 shot.

The doppler got all the shots, any insight ?

I got a tip from a comment on youtube regarding the SNR reading, which is a Signal-to-Noise Ratio. He recommended excluding any readings with SNR less than 20, which eliminates any readings having a weak signal relative to noise that the device received when recording measurements.

Full disclosure: I just received my Labradar V1 yesterday in the mail, so I'm speaking of things I have zero experience with yet. Sounds like I have a similar setup to yours, though the mic I purchased is the one offered by JKL Precision. My goal is the same as others here: produce accurate archery sight tapes using Precision Cut Archery app. I'll post back here with my experience with it after I've had an opportunity to test.

 

[Herrdoberman]

At 77 yards, depending on the speed, might have trouble picking it up.


I was able to use mine at that distance, or 75 yards maybe? but was upper 290's fps. I could see if you were in the 260's it might have trouble picking it up. Arrow getting above the radar path until its further out. That's just a guess tho, don't know exactly how wide the doppler band is.

Will lower the distance a bit. I only need 20 and 65. The radar should pick my arrow they are 360 grains at 70#.

 

[Johnboy]

Will lower the distance a bit. I only need 20 and 65. The radar should pick my arrow they are 360 grains at 70#.

I did some digging and found a statement on a forum that defined the Labradar's Doppler signal cone angle at 18.5 degrees in the horizontal plane and 7.6 degrees in the vertical plane. Applying some launch angle analysis, if your target is 65 yards from the chrono, you're shooting from the chrono's location, and your chrono is aimed directly at your target's bullseye (half of signal cone below and the other half above the point of aim), your bow would have to produce 270 fps exit speed (assuming no drag/deceleration) in order to keep the arrow within the signal cone. Granted, in the real world, arrows do indeed slow down on the way to the target. Thus, the actual required speed is higher than 270 fps.

It seems to me, in order to minimize misreads from the Labradar due to the arrow traveling outside of the signal cone, it would be best to have the bottom of the signal cone aimed at your target so as to aim the cone favoring the arrow's upward trajectory pathway. Here's a quick reference for distance above your target's bullseye that you'd want to aim the Labradar for various target distances in order to put the entire 7.6 degree vertical cone precisely at and above your bow's point of aim.

Target Distance from Labradar & Shooter	Labradar's Aim Above Target
20 yards	8 ft
30 yards	12 ft
40 yards	16 ft
50 yards	20 ft
60 yards	24 ft
70 yards	28 ft
80 yards	32 ft
90 yards	36 ft
100 yards (max range for Labradar V1)	40 ft

Again assuming a theoretically constant arrow speed (no deceleration), any bow faster than 192 fps wouldn't require a launch angle greater than the 7.6 degree cone angle when aiming at a target 100 yards away (Labradar's maximum reading distance downrange). So, it would seem that the bow would have to be pretty slow for the arrow to arc above the cone if the cone is aimed upward as described above.

Disclaimer: I still haven't tested any of this, so it's all still theoretical to me.