TS4000 Radio Modem User’s Manual
Radio Setup
22
Selection Description
GMSK (BT=0.3)
Gaussian Minimum Shifted Keyed modulation with a BT =
0.3.
This is more spectrally efficient than GSMK (BT=0.5)
modulation.
GMSK (BT=0.5)
Gaussian Minimum Shifted Keyed modulation with a BT =
0.5.
This is the least spectrally efficient modulation. However, it
provides the best BER for a given receive signal level.
Rate
The over the air modulation bit rate.
All TS4000s that communicate together must use the same
setting. Lower settings result in better signal demodulation
which results in a better (lower) BER (Bit Error Rate) for a
given receive signal level.
The maximum rate that can be set depends on the settings of
occupied bandwidth and modulation type
This sets the receive signal level at which the receiver is activated. This is
similar to the squelch control on mobile radios. Normally this level is set slightly
lower than the level at which the TS4000 can correctly demodulate the incoming
data.
Receive Carrier Detect
Level
When using the TS4000 in a high noise environment, this level can be raised so
that the TS4000 is more selective about the signals that it attempts to
demodulate. This is important for configurations that do not allow the TS4000 to
transmit while it is receiving. These include configurations with packet operation
enabled or with the Force Transmit over Receive control disabled.
The TS4000 can be configured to periodically output a Morse code identification
string.
Automatic Station ID
Selection Description
Enable
Automatic
Station ID
When the control is selected, the modem will output the ID
message at the designated repeat time.
Repeat Time
This is the amount of time between station ID transmissions.
ID Message
This is the text message that is transmitted. The
transmission is formatted as standard Morse code.
This is typically set to be a station call sign, license number or
location.
Selection Description
Active Channel
at Power Down
The channel activated at power up is the channel that was
active when the modem was last powered down.
Port 2
Handshake
Lines
The channel is controlled by the handshake input lines of
serial port 2 according to the table below.
RTS DTR Channel
Low Low 1
Low High 2
High Low 3
High High 4
Frequency Channel at
Power Up