DE
DANIELS
ELECTRONICS
2-4
VT-4B150 VHF Project 25 Digital Base Transmitter Instruction Manual
2.2.2.7
DCS Invert
This option allows the DCS code to have its phase inverted by 180 degrees, which is used to
compensate for phase inversions introduced in the signal path.
2.2.2.8
Enable Turn Off Code
This option enables a DCS Turn Off Code to be sent at the end of a transmission. The Turn Off
Code signals to the receiving radio that the transmission is ending, allowing it to mute more
quickly.
2.2.2.9
Transmitter Power
This option is not currently used.
2.2.2.10
Channel Bandwidth
This setting should be changed to match the channel spacing and bandwidth of the operating
channel. Both 25 kHz and 12.5 kHz are supported for Analog channels, while Project 25
channels are limited to 12.5 kHz.
2.2.2.11
Deviation
This is a read-only field that shows the maximum amount that the transmitter frequency will
deviate. This field changes automatically in response to the Channel Bandwidth setting. A
bandwidth of 25 kHz selects a maximum deviation of 5 kHz, while a bandwidth of 12.5 kHz
selects a maximum deviation of 2.5 kHz.
2.2.2.12
Time Out Timer
This option enables the operation of a Time Out Timer that disables the transmitter output after a
predetermined period of use. If the option is enabled, a further box becomes visible to allow the
user to set the desired time into the timer.
2.2.2.13
Channel Status
This option is not currently used.
2.2.2.14
Transmitter Pre-emphasis
For analog channels, the standard 6 dB/octave pre-emphasis curve may be either disabled or
applied to the transmitted audio
