|RT9000 Single Channel Radio Telephone|
|RF-Tel?s most recently developed product, the RT9000 is available in VHF (138 to 174 MHz with 5 to 20 watts power output) and UHF (310 to 470 MHz with 1 to 10 watts power output). The RT9000 is a fully-programmable multifunctional radio telephone system that has been designed to meet the needs of today?s automated operations. It incorporates a state-of-the-art single microprocessor chip and radio frequency synthesizer as well as surface-mount technology. It requires a minimum of setup time to change it from a subscriber unit to a central office (CO) unit or to a repeater unit.
The main components of the RT9000 unit are: a full duplex synthesized VHF/UHF radio with adjustable RF power from 1 to 20 Watts, a 6 or 5 cavity duplexer, a microprocessor controller board, an optional 4 channel expansion board, and an optional 110/220Vac or 24/48Vdc to 12Vdc internal power supply.
Designed and manufactured to telephone carrier industry standards, the RT9000 radio complies with Industry Canada (formerly DOC), FCC and CCITT regulations.
Standard Features of the RT 9000
Central Office Unit
When the RT9000 unit is configured as a CO unit and is connected to the tip and ring of the CO exchange telephone line, the exchange interprets the RT9000 unit as a telephone set with two states (on-hook and off-hook). In the standby mode, the unit is in the on-hook state, its transmitter is off and the line coming from the exchange is connected to a high impedance ring detector circuit. In this configuration, the CO unit performs the following functions:
Detects ring frequency between tip and ring and transmits this information together with the corresponding subscriber ID via FSK signaling to the subscriber unit
Detects line reversal and 12/16kHz SPM pulses for payphone applications and transmits this information via FSK signaling to the subscriber (payphone) unit
Decodes the ID and off-hook state of the remote subscriber unit and seizes the telephone line corresponding to the calling subscriber
Decodes pulse dialing from the subscriber unit and activates the pulse dial relay
Decodes scrambler/compander codes from the subscriber unit and actives the corresponding scrambler/compander
When the RT9000 unit is configured as a subscriber unit and is connected to the subscriber’s telephone set, the telephone interprets the RT9000 unit as a CO exchange. In the standby mode, the unit is in the on-hook state and its transmitter is off. In this configuration, the subscriber unit performs the following functions:
Signal Strength Meter and Faults
The front panel of the radio has two sets of LED’s and a 2-digit display for signal strength indication. The first set of 5 LED’s provide indication of signal strength and light up in increments of 6dB.
The 2-digit display provides an indication of the signal strength from 1 to 32µV in 1µV steps. In normal operating mode the display indicates signal strength and in "Techmode", the display indicates the last activated function.
The other set of 4 LED’s provide status indications of "ON", "Tx" (transmit), "COR" and "Fault". Whenever the microprocessor detects a malfunction of the radio operation, the "Fault" LED comes on and a fault code is activated on the 2-digit display. The following fault code indications are provided:
An 8 position DIP switch located on the controller board allows the radio to be configured for:
Programming from a PC
Personalities are stored in EEPROM and become the default mode of the radio on power up. Personalities can be programmed via RF-Tel’s programming software on a graphic layout page and downloaded to the radio via the RS 232 port. Most of these parameters can also be changed directly from a DTMF telephone using the appropriate security access code.
User programming allows the Subscriber to activate or de-activate the compander and scrambler from his telephone after a connection has been established.
When going off hook, the radio will initially come up in the default mode (compander on, scrambler off) established in personality programming.
To activate the compander, the user dials #*11, to de-activate the compander he dials #*10.
To activate the scrambler, the user dials #*61, to de-activate the scrambler he dials #*60.
A double audible beep indicates to the user that the function selected has been activated, a single audible beep confirms that the function has been de-activated. When going on hook, the radio system reverts to the default mode.
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