6.13. Question: How do I configure my external radio as a repeater?
Answer: In order to correctly configure a radio network with a repeater, all
radios must have matching settings. Ensure the same frequency, radio
protocol, channel spacing, FEC, and scrambling options are found on all
radios.
For more detailed instructions please refer to our “APS-3 Radio Guide”
document located on the Altus website.
6.14. Question: What is NMEA Output?
Answer: NMEA (National Marine Electronics Association) output is a
standard format of digital data exchange. It provides the position, time,
Latitude, Longitude, fix quality, number of satellites being tracked, as well as
other pertinent data integral to GPS technology.
6.15. Question: How Do I setup the APS-3 to output a NMEA message?
Answer: The command for NMEA output may be issued via line command
using data collection software (SurvCE&FIELDGenius) or manually.The easy
method is to send a command to the receiver after you have completed
configuration.For example, the command to send out a GGA string once per
second is:
SNO,STREAM9,COM3,GGA,SEC1
To send more than one NMEA strings, use the + variable. For example to add
ZDA, the command is:
SNO,STREAM9,COM3,GGA+ZDA,SEC1
6.16. Question: What is the difference between GSM vs CDMA?
Answer: GSM “Global System for Mobile communications” is an
international standard and uses a SIM (Subscriber Identity Module) card. It is
best suited for international roaming. The advantage of a SIM card is that it
may be placed in any device the user would like at any time.
CDMA “Code Division Multiple Access” is a signal that is better suited for
voice as studies have shown. These devices do not use a SIM card and
thereby make switching devices much more difficult and time-consuming.
The European Union mandated the sole use of GSM technology, making
CDMA not practical in that area. CDMA is much more complicated than that
of a “simple” GSM system; as a result, the batteries in CDMA devices deplete
at a higher rate than GSM devices.
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