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8.13 BEACON RECEIVER SETUP (INTERFACES)
The Beacon Receiver Setup Page
allows the GPS 95 to control GARMIN's
GBR 21 differential beacon receiver.
In order to use the beacon receiver,
the “RTCM/NMEA” and “NMEA 0183”
settings must be selected. If these
interface settings are not selected, the
GPS 95 will only display the message
“No RTCM/NMEA 0183 interface selected” on the Beacon Receiver Setup
Page.
The “Tuned To:” field is the frequency, in kilohertz (kHz), to which the beacon
receiver is currently tuned or is attempting to tune. Below this field is a bit rate
cyclic field which allows you to choose between bit rates of 25, 50, 100 and
200 bps (bits per second) by pressing CLR while the “Bit Rate” cyclic field is
highlighted.
When you first select the Beacon Receiver Setup Page, the GPS 95 and
GBR 21 will automatically try to tune the last frequency and bit rate which you
selected. You may enter your own frequency (between 283.5 kHz and 325.0
kHz in 0.5 kHz increments) and bit rate if desired. A message of “Tuning” will
then be displayed near the bottom of the page, directly after the “SNR” field.
You must provide the unit with another frequency and bit rate before it will
attempt to tune again.
If the beacon receiver receives the selected frequency at the chosen bit rate,
the “SNR” field will display the received signal-to-noise ratio and the status
message will be one of the following:
Receiving - The GPS 95 is receiving status and DGPS correction information
from the beacon receiver.
No Data - The GPS 95 is receiving status information from the beacon
receiver, but not DGPS correction information.
When a chosen frequency and bit rate result in a status of “Receiving”, the
GPS 95 will use the DGPS corrections from the beacon receiver to calculate
differential positions. Also, the “Distance” field will show the distance to the
beacon being received.