6.5.1
FREQUENCY SELECTION
The Frequency page has fields for transmit and receive frequencies of each channel, and for the
selection of the operating mode of NXDN Super Narrow, NXDN Narrow, and Analog. Channel
information can be entered by clicking on the appropriate box and entering the desired frequency.
The frequency chosen must be within the operating range of the radio and on a frequency for
which the synthesizer is capable of channeling i.e. for VHF, divisible by 2.5 kHz and for UHF,
divisible by 5 or 6.25 kHz.
6.5.2
GENERAL
The General page allows for programming various parameters of the radio. These are detailed
below:
Customer ID
– Allows the user to store up to 35 ASCI characters to identify the individual unit.
Test Pin Input Logic Level(PTT)- Sets the polarity of the PTT input. Normally set for active low
i.e. transmitter is activated when this input is at the logic low state.
Due to the internal pull-up
resistor, setting this to active high will cause activation of the transmitter when the
PTT/RTS input is left unconnected.
The factory default is active low.
TX Timeout Timer- Allows for limits on the maximum time the transmitter may be continuously
keyed. When set, the maximum limit is set in the box. To prevent overheating and possible
damage to the unit, this is normally set on with a time of 60 seconds of less. See section 5.4 for
limits on maximum key-down times. The factory default is 60 seconds.
TX High Power- Sets the maximum limit of the High Power setting (1-6 Watts).
Channel/TX High Power/ TX BCL- Sets the High Power value on a per-channel basis and allows
the user to Enable/Disable the TX BCL(Busy Channel Lockout) feature.
Busy Channel Lockout- Prevents the transmitter from activating when the carrier detect output is
true. Used to prevent interference on a channel where activity already exists. Not normally
enabled in half duplex operation since transmit and receive channels are not on the same
frequency. Factory default is for this function to be off.
Green LED- Sets the operation of the green LED on the front of the radio. The choices are:
Off-The green LED is never on.
Power ON-The green LED is on whenever the radio is powere
d up.’
Carrier Detect-The green LED is on whenever a carrier is detected that is above the
programmed carrier detect on threshold.
RX Synthesizer Lock-The green LED is on whenever the frequency synthesizer is locked
while in receive mode. This is the factory default setting.
RX Data- The LED will turn on when a valid data stream has been received.
Red LED- Sets the operation of the red LED on the front of the radio. The choices are:
Off-The red LED is never on.
RX-The red LED is on whenever the radio is actually transmitting. This is the factory
default setting.
Comm Port Baud Rate- Sets the communication Baud Rate between the computer and the radio.
38400, 19200, 9600, 4800, 2400 bps.
