If you are using the wireless system for timing Jumper classes the HL610 will meet your needs. We time Jumper classes 150 days per year using HL610's and have not had any problems with distance or interference in the larges Jumper arenas in the U.S.
Of course with any wireless system you will miss an occasional impulse due to outside interference.
In show jumping there is no problem.but i have got some impulse due to walky talky.(not expensive set )just rx have interference and it's like you have impulse from the arena.
when i time keeping the cross-country there is a lot of distance between start and finish. Some times organization commity used many walky talki.And i 've got many interference. My solution it's to use my old HL620 (i think they are forbiden in france now ?)
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