I have recently used a locus receiver mounted on a four wheeler to filed check a conventional topo. I have had problems keeping the receiver from alarming, when working in wide open areas with 8 to 9 satellities in view. I don't know if it is the speed or the oscillation of the receiver on the back of the four wheeler. I wonder if anyone else has experienced this problem? Collected date on 11/26, maybe just a bad solar day? Thanks

Speed isn't a problem, but vibration definitely can be.

I've had Locus units shut down from being jarred on a pole. Battery case/springs could be improved maybe.

SV tracking is dependent upon the receiver oscillator, so shocks to the receiver disturb its clock, causing loss of lock. We shock-mount the oscillators, but there are limits to the amount of vibration and jarring that the receiver can handle without loss of lock.

Thanks

I guess I will have to just walk those kinematic checks in the future, thanks for the feedback.

Mark

Several times I have jared one of my recievers by setting the rod down firmly and have recieved the warning. Altought when I processed the file everthing had a good solution. These files were with 1 or 2 minutes of data per site not continous. Have you tried to process the data yet.

Stan

The observations that I processed were good horizontally, but vertical was off 1-2 feet. When I heard the alarm I reinitialized and the rest were 0.1 vertical. I had the receiver mounted on a four foot range pole on a jig on the back of the four wheeler. The noise of the four wheeler made it had to hear the alarm on the receiver.

Receivers with external antennae are better suited to this sort of thing, as you can isolate the receiver from the worst shocks by mounting it in a foam-lined box. Locus can't accommodate an exernal antenna (it would have defeated the "cable-free" design).

Try building a plywood box big enough to put the Locus in, lining it with foam, put the antenna height ring on the unit and set it inside the box. You can mount the box with a 1/2" pipe flange screwed to the bottom and the other flange to your atv.....one vibration damper. Since your biggest problem is hearing the kinematic alarm, you have to use the foam to hold up the antenna ring. Then drill a few holes in the bottom of the box so the box acts like an amplified speaker enclosure for the kinematic alarm....the extra sound levels might be audible over the atv noise....don't forget the foil protective, though, as you never know when Locus will scream too loud.......

Brian & Robert

Maybe I could find foil-faced foam rubber and kill two birds with one stone. A foam lined box may be worth trying. Thanks for all your input!