User's Manual Part 1

Radio Configuration

P/N 7010-0713

2-31

Set Radio Link Parameters for Free Channel

Scan

1. From the Protocol control, select TPS.

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

that will be used by your base 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.

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.

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

robust data communications over the areas with possible

interference.

5. 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.

NOTICE

While providing error control in data transmission, FEC

adds redundant check bits to the data stream reducing

data throughput. If using 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 ensure reliable radio

communication between the base and rover receivers.

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

4800 baud GMSK

9600 baud GMSK or 4-Level-FSK

19200 baud 4-Level-FSK