The message indicating projectile could not be tracked means you're at least getting a trigger. If your sensitivity level and /or rifle-handgun setting is mismatched to the round you're shooting and doesn't trigger, the display just sits there unchanged.
Most likely, you have an aiming problem. You might try cutting about 3-5" of the barrel of a thin ball-point pin and tape it securely into the aiming notch. Use this to sight your target - step back from it to obtain the smallest target image you can through the barrel. Once you start tracking rounds, pay attention to the return-signal "bar graph" for each round - the more bars you have, the stronger the return - hence an indication of proper aim. With a 6.5CM, I look for all or all but one of the bars to be solid.
Here are the sensitivity settings that work for me. I use the plate Labradar sells as a mount.
- 6.5CM, APA "Little B*rd" brake (major side blast): Unit is placed about even with and nearly touching the scope turret to avoid blast. Rifle setting, sensitivity level 3.
- .223, no brake: unit placed even with muzzle, about 6" to the side. Rifle setting, sensitivity level 1.
- 9mm pistol or PCC: same as .223 but handgun setting.
- .22LR: Place the microphone sold as an accessory to the unit VERY close to muzzle - in front, to the side just enough to keep from shooting it. Handgun setting, sensitivity level 1.
I haven't missed a reading in several hundred, if not into the thousands, of rounds now. With the .22, I did have initial difficulty and call LR tech support right from the range. Quick and helpful.
There are other threads here describing sighting and triggering accessories that are available. These may be more convenient, but in my experience not truly necessary.
EDIT: Let me reiterate that the unit
must be placed clear of brake blast. As described, I place mine adjacent to and almost touching the scope turret. A friend of mine uses a large, heavy tripod to essentially suspend his LR above the brake-blast line.
Good luck.
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