User's Manual
Table Of Contents
- 1 REGULATORY AND SAFETY INFORMATION
- 2 PREFACE
- 3 SPECIFICATIONS
- 4 GENERAL INFORMATION
- 5 OPERATION
- 5.1 CONVENTIONAL STATION CONFIGURATIONS
- 5.2 ENCRYPTED STATION CONFIGURATIONS
- 5.3 MODES OF OPERATION
- 5.4 ENCRYPTION FORMATS
- 5.5 P25 CONVENTIONAL CONFIGURATIONS
- 5.6 PROGRAMMABLE FEATURES FOR CONVENTIONAL STATIONS
- 5.6.1 Conventional Stations (Setup)
- 5.6.2 Main Station Data
- 5.6.3 Push-to-Talk Options
- 5.6.4 Other Potentiometer Settings
- 5.6.5 Carrier Control Timer
- 5.6.6 Squelch Tail Elimination
- 5.6.7 Drop Out Delay Timer
- 5.6.8 Control Shelf Options
- 5.6.9 Station Remote Control
- 5.6.10 Auxiliary Control Relay
- 5.6.11 Squelch Operated Relay
- 5.6.12 Channel Guard Monitor
- 5.6.13 System Module - Digital Signal Processing
- 6 MASTR III ADC STATION DESCRIPTION
MM102558V1 R1A
DTMF tones are sent to the station via the wire line interface where the System Module decodes the tones
as channel assignment information. The DC or Tone Remote signaling then controls the TX/RX
operations of the station on the channel selected by the DTMF signaling.
5.1.2 Conventional Repeater
When configured as a Conventional Repeater, the MASTR III ADC station provides full duplex (different
TX and RX frequencies operating simultaneously) operation as a single channel repeater station. The
repeater may be programmed for any standard Channel Guard, Digital Channel Guard or Type-90 tone.
MASTR III ADC stations configured for repeater operation may also be configured for DC or Tone
Remote control. Console TX and RX, Channel Guard disable and repeater enable are common features
available using 2-wire or 4-wire remote control.
5.1.3 Remote-to-Repeater
When configured as a Remote-to-Repeater station, the MASTR III ADC station provides full duplex
repeater operation just like Conventional Repeaters, with extended capability to share TX, RX and control
operations via 4-wire interfacing with another MASTR III ADC station operating as a Remote Base. The
Remote Base station can be co-located or remotely located at another site.
5.1.4 Transmit Only
MASTR III ADC stations operating as Transmit Only stations provide the necessary equipment to operate
as a One-Way Paging Station or other similar Data transmitters. Only transmitter related modules and
components are provided with the station T/R shelf.
A Data Module is provided for 9600 bps NRZ TX data capability. The Data Module provides the
required 12.8 MHz reference oscillator signal to the TX Synthesizer, thus meaning no RX Synthesizer is
required (the usual source for the 12.8 MHz reference oscillator signal).
5.2 ENCRYPTED STATION CONFIGURATIONS
MASTR III ADC stations equipped with external encryption equipment may be configured one of two
ways:
• End-to-End Encryption
• RF Only Encryption/Decryption
5.2.1 End-to-End Encryption
With end-to-end encryption, the voice encryption occurs at the dispatch center or originating radio and
remains encrypted all the way to the properly equipped mobile or portable radio. External encryption
equipment is located at or nearby the dispatch center and connected to the MASTR III ADC station via
four-wire interconnection. This method of operation provides the highest level of system security.
However, four-wire interconnection with one or more consoles is always in the clear mode. This assumes
that the dispatch center is secure and that the console interconnection will be by short, local cable runs
that are adequately secure.
With end-to-end encryption, Cryptographic key information is not required at the MASTR III ADC
station is located. All key loading occurs at the dispatch center or originating radio where the external
encryption equipment is located.
26