Sokkia Axis 3, Operation Manual

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32 Axis
3™
Chapter 4 Axis
3
Operation
signal quality. If a DGPS broadcast is identified that exhibits a 2
dB greater signal strength than that of the primary station, the
receiver will automatically switch to this beacon. No loss of lock
occurs on the primary station during the background scan.
The Axis
3
receiver stores the current primary beacon in
memory so that it is available upon subsequent power-up.
4.4.2 Using Manual Mode
In Manual Tune Mode, you can select a specific frequency and
bit rate for the receiver, you can specify the frequency only.
Specifying the frequency only allows the Axis
3
to identify the
correct MSK rate on its own, which is useful when working in
an area where you know the frequency, but not the MSK bit rate
of the closest beacon.
4.5 Beacon Performance - SNR Reading
The Signal to Noise Ratio (SNR) best describes the beacon
receiver performance. The SNR is the height of the signal above
the noise floor. The higher the SNR, the better the reception. The
SNR can be monitored with your data collector (refer to your
data collector reference manual for more information).
The following table describes the beacon receiver quality of
reception with respect to the SNR reading. You can use your
data collection software to set current SNR values.
SNR
Reception
Description
Appx. Data Throughput
>25 Excellent 100% data throughput
20 to 25 Very Good 100% data throughput
15 to 20 Good Good data throughput up
to 100%
10 to 15 Stable Moderate/good throughput