Kenwood TK-480 Service Manual page 8

■ Emergency Status response
"Alert" can be selected for the called radio unit's re-
sponse to reception of status 99 which is used as an emer-
gency status.
4-9. Other Functions
■ Manual Dial
Fleet, ID and Status numbers can be entered from DTMF
keypad.
■ Data TX with QT/DQT
Whether programmed QT/DQT is modulated or not with
a data transmission except for Selcall. A radio unit can re-
ceive a data message regardless of QT/DQT if the receiving
unit is not scanning.
■ DMS Baud Rate
MSK data baud rate setting. The same rate must be set
as a communication partner.
1200bps :
Data communication is made in 1200bps. The communi-
cation area is much wider than 2400bps. Recommended for
repeater operation.
2400bps :
Data communication is made in 2400bps. The communi-
cation area is narrower than 1200bps, but it will decrease
the data traffic. Data rate 2400bps may not work properly
depending on the repeater's characteristic.
■ Inter-fleet call
Inter-Fleet Calls allow a radio of one Fleet number to call
a radio with a different Fleet number (radio users can manu-
ally dial a Unit ID with a different Fleet number).
■ Status/Short/Long Message on Data Group/
Channel
Status/Short/Long Message transmission is made
whether on the Data System/Group.
■ Status/Short/Unit ID Message Serial Output
Whether a received Status/Short message or PTT ID is
outputed or not to serial port.
4-10. Parameters
■ GTC Count
Number of "Go To data Channel" messages to be sent
before transmitting a data message if it is being made on
Data System/Group. If a radio unit receives a GTC message,
it will move to the Data System/Group of the current sys-
tem. Increase this item to make sure the called radio unit
moves to the Data System/Group.
■ Random Access (Contention)
When a channel is busy, radio unit will not transmit (de-
pending on its Busy Channel Lockout setting). As soon as a
channel is cleared, some transmissions may crash. Random
access is used to avoid this by employing a random trans-
mission sequence.
OPERATING FEATURES
■ Number of Retries
transmission when no acknowledgement is received in the
Maximum ACK Wait Time. Increase this item to improve
data communication reliability.
■ TX Busy Wait Time
fore giving up the data transmission when the channel is
busy. Also, this timer affects if it expires during Random
Access period.
■ Maximum ACK Wait Time
time to wait for an acknowledgement from the called radio
unit. It is used as an interval time of retries. It must be set
greater than the ACK Delay Time of the called radio unit.
■ ACK Delay Time
receiving a data to the beginning of sending an
acknowledgement. It should be adjusted as the repeater's
hang-up delay time. Also, it must be set less than the Maxi-
mum ACK Wait Time of the calling radio unit.
■ TX Delay Time (RX Capture)
sion to let the called unit stop scanning or exit its battery
save mode. It is used only when starting a data communica-
tion sequence.
■ Data TX Modulation Delay Time
from the beginning of transmission to the beginning of a
data modulation. It is used every time data is transmitted.
Number of Retries is the maximum number of retry
TX Busy Wait Time is the maximum amount of time be-
Maximum ACK Wait Time is the maximum amount of
ACK Delay Time is the amount of time from the end of
TX Delay Time is the amount of unmodulated transmis-
Data TX Modulation Delay Time is the amount of time
TK-480
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