Table of Contents
Advertisement
7 Troubleshooting
Problem
Does not operate.
Does not Lock.
Cannot output 10MHz or
1PPS signal to the
corresponding devices.
ARARM LED is displayed.
Failed to connect to
Android App.
8 GNSS Antenna Installation
In order to improve the reception of signals from GNSS satellites, GNSS antennas should be installed in an open
sky condition. Open sky refers to an outdoor environment with a clear sky view and without obstacles along the
entire periphery. GNSS signals may be reflected by buildings, trees, ground, etc., and reach the GNSS antenna
through different paths, this is called multipath. It degrades the accuracy of GNSS poisoning, as well as the
accuracy of time and frequency output from TB-1. It is therefore necessary to install the GNSS antenna in an
open sky environment whenever possible.
In consideration of the multipath effect that can cause long wait times until Lock status, it is recommended to
install the GNSS antenna in a place with a clear view. In particular when using "Measure atomic
oscillator"mode which requires accurate GNSS positioning, it is strongly recommended that utmost care is
exercised when selecting installation environment of the GNSS antenna.
In case of difficulty to install the GNSS antenna in an open sky environment (ex. indoor environment), it is
better to install outside the window than near the window, particularly metalized glass windows. As viewed
from the GNSS antenna, the signals from the direction of the building may have been affected by multipath, so
it is recommended masking this heading (Mask Settings) to improve the accuracy of time and frequency output
from TB-1.
Since the signals from GNSS satellite are extremely weak, RF noise may interfere via GNSS antenna and
adversely affect the GNSS signal reception of TB-1. Avoid installing GNSS antenna near equipment emitting
RF noise.
Solution
Check Power LED. (Check the voltage and current of the power supply.)
It takes approximately 5 minutes after power-on in an open sky condition and
additional 5 minutes when using "Measure atomic oscillator" mode.
Check the antenna location and connections. Details refer to Chapter 8. GNSS
Antenna Installation.
Check wiring of connecting cables.
Check the impedance/voltage level of 10MHz・1PPS signal.
In case 10MHz or 1PPS is not available, it could be a malfunction, contact us for
assistance.
In case 10MHz or 1PPS output with Lock status, the device could be nearing
the end of life, please replace with a new one.
Check if Android App is installed and run properly.
Check if DATA USB properly connected with Android device..
12
TB-1
Operation Manual
SE20-900-014-02
Advertisement
Table of Contents
