User's Manual Part 1

Radio Configuration

P/N 7010-0713

2-35

2. From the Modulation Type control, select a modulation scheme

that will be used by your rover radio-modem. It can be either

Level-FSK

(Frequency Shift Keying) or GMSK (Gaussian

Minimum Shift Keying). The following table shows you what

modulation technique can be used at a specific link rate.

Must be the same for base and rover.

3. From the Link Rate control, select the rate at which data is

transmitted over the RF link. The UHF radio-modem supports

4800, 9600, and 19200 baud. Note that this setting affects the

Modulation Type control and vice versa. Must be the same for

base and rover.

4. From the RX control, select the operating frequency that will be

used by your rover radio-modem to receive differential data. Must

be the same for the base and rover.

5. Select Scrambling. If enabled, this parameter provides more

robust data communications over the areas with possible

interference. Must be the same for base and rover.

6. For a maximum data communication reliability, select the

Forward Error Correction checkbox. With this parameter

enabled, the rover radio-modem has the capability to check and

correct transmission errors (if any) in an incoming data stream.

Must be the same for base and rover.

NOTICE

While providing error control in data transmission, FEC

adds redundant check bits to the data stream reducing

data throughput. If you are going to use FEC and a format

of differential messages requires a great deal of data (e.g.,

RTCM 2.x) transmitted over the radio link, it is

recommended to select 19200@4-Level-FSK. This will

If the Link Rate is... Use...

4800 baud GMSK

9600 baud GMSK or 4-Level-FSK

19200 baud 4-Level-FSK