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CONFIGURATION AND OPERATION
3.7.3 Menu Tree Item Descriptions
This subsection describes each item of the VDO DGPS-Receiver software menu tree.
Level 1: Automatic and Manual Mode
Automatic and manual modes share a common Level 1 of the menu
tree. This level provides the basic operational status of the receiver, including the currently tuned frequency and beacon. To access level 2 in
either automatic or manual mode from Level 1, press the
key.
Frequency
Frequency displays the operating frequency in kHz
Identification
Identification displays either the name or the beacon identifier of the station tuned.
Performance
Performance displays the number of valid decoded
RTCM messages as a percentage of the messages
received correctly over a given period of time.
Signal to
Noise Ratio
Signal to noise ratio displays the ratio between the
desired signal and the unwanted noise at the selected frequency, expressed in decibels (dB). The
VDO DGPS-Receiver requires an SNR of better
than 7 dB in order to achieve a lock. This signal to
noise ratio corresponds to a bit error rate (BER) of
less than 1:1000. A higher SNR is more desirable
than a lower one.
Signal
Strength
Signal strength, expressed in dB, is a numeric re
presentation of the near noise, far noise, and field
strength of the received signal at the selected frequency.
Level 2: Automatic Mode
Auto Srch
Select Automatic Beacon Search mode to place the
receiver into automatic operation. In this mode,
both the frequency and MSK rate are selected by
the receiver automatically, to provide the best per
formance. In this operating mode, the receiver will
conduct a Global Search where the VDO DGPS71