DE
DANIELS
ELECTRONICS
VT-4R150 VHF Project 25 Digital Transmitter Instruction Manual
2-7
Transmitter settings are divided into two categories, Radio Wide options, which apply at all times,
and Channel Wide options, which can be programmed differently for each channel. When the
Transmitter menu is selected from the main screen, both the Radio Wide and Channel Wide
options for the current channel are displayed.
The RSS may be used to save a Transmitter configuration to disk. This function allows a radio
shop to save a “standard” configuration, and use it as a starting configuration for all Transmitters.
An archive of configurations from each radio system in operation may also be kept so that
replacement radios can be programmed easily.
2.13.1
Transmitter Wide Options
Several options may be set which affect the operation of the Transmitter on a global basis.
2.13.1.1
Frequency Band
There are four Frequency Bands available for Transmitters:
VHF (low band) 136 - 150 MHz,
VHF (high band) 150 - 174 MHz,
UHF (low band) 406 - 430 MHz,
UHF (high band) 450 - 470 MHz.
When the Frequency Band is changed, the Frequency field in every Transmitter channel will be
changed to the lowest frequency in the band.
Warning:
Daniels Transmitters are built differently depending upon the band. Therefore, you
cannot change a transmitter to a different band without a hardware change.
2.13.1.2
Source ID
This field contains the unique Transmitter Source ID in Hexadecimal. (There is no need to enter an
initial ‘$’character.) The default value is $1. The spin button to the right of this field allows you to
incrementally change the Source ID.
The Source ID will be transmitted along with every P25 voice frame and each Transmitter should
have a different number.
2.13.1.3
Secure Hardware Equipped
This setting is currently not used for Repeater Transmitters, but is supported for programming of
Daniels P25 Base Transmitters. Correct repeater operation does not require that an encrypted
signal be decrypted. An external Repeater Controller may include encryption and decryption
hardware for those cases, which require it.
2.13.1.4
Timeout Options
The transmitter provides a selectable timeout timer for each channel, which causes the transmitter
to be de-keyed after the selected interval of continuous transmission, has been completed. Four
transmitter timeout values are provided, and one of the timeout values may be used in each of the
32 programmable channels. The range of values is from 15 to 465 seconds in increments of 15
seconds, or Infinite Time may be chosen