CHC i83 User Manual 62
1 foot above your GNSS antenna, the beam width is 1.6’ in diameter. 20 feet above the rover antenna (perhaps the
midpoint of tree canopy), the 1
st
Fresnel beam diameter is 7 feet! A clearing in the treetops 100’ above your antenna
needs to be 16’ in diameter.
At the midpoint between your receiver and the satellite, the Fresnel beam is over 6,000 feet in diameter! And that is for
the signal for a single satellite, multiply this by the number of tracked satellites and there is signal energy everywhere.
Conclusion
There are many things that can go wrong with OPUS occupations. Some you can control, some you can’t.
If you stack multiple problems:
Bad Constellation + Short Occupation + Moderate Canopy + Bad HI => FAILURE
Your OPUS solutions will fail or have high RMS estimates and the time you spent collecting the observation will be
wasted.
The OPUS family of online tools: OPUS-Static, OPUS-RS, OPUS-Projects are amazing. They allow users to generate
reliable X, Y and Height coordinates for GPS suitable locations, anywhere in the world. Hopefully by utilizing the simple
rules presented in this chapter, all your jobs will be
OPUS-Successful!
Troubleshooting the i83 Receiver
1. Receiver won’t turn on:
Batteries are fully discharged: Charge batteries or use external power.
Battery is bad: return to factor for replacement.
2. Is the receiver tracking satellites?
The BLUE LED flashes once for each SV (satellite vehicle) that is currently tracked.
If you are indoors, the LED will flash
once
every 5 seconds. However, no SV’s will be tracked.
The receiver should begin tracking within 30-seconds after a warm start. After a cold start (off for more than 1 week) it
may take 90-seconds for the receiver to begin tracking.
If the receiver will not track satellites outside after waiting 5-minutes do an OEM engine reset using one of the methods
outlined in GNSS OEM Reset on page 68.
5. The receiver won’t mount as a Disk Drive.
Unplug, wait 15 seconds, try again.
Try another USB port, try another USB cable. The factory cable has purple plastic inside the cable housing.
Use an external USB Hub (this fixes intermittent disk mounts.)
Try another computer.
Try turning off your PC, wait a minute and then turn it on again. Reinsert the USB cable.
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