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TRA-223
User Manual
18 pgs874.38 Kb0

Vega TRA-223 User Manual

Model TRA223
Tone Remote Panel
Technical Manual
August 29, 2002 P.N. 803570
Table of Contents
1.1 Accessories............................................................................................................................ 2
2.1 Power Supply........................................................................................................................ 3
2.2 Line Connection.................................................................................................................... 3
2.2.1 Full Duplex.................................................................................................................... 3
2.3 Radio Connection.................................................................................................................. 4
2.3.1 TX Audio Connection.................................................................................................... 4
2.3.2 RX Audio Connection.................................................................................................... 4
2.3.3 TO-23 Balanced Transformer option............................................................................. 4
2.3.4 PTT Connection............................................................................................................. 4
2.3.5 Monitor Connection....................................................................................................... 4
2.3.6 RX Squelch.................................................................................................................... 4
3.1 Line Receive Level............................................................................................................... 5
3.2 Radio TX Level..................................................................................................................... 5
3.3 Line TX Level....................................................................................................................... 5
3.4 Monitor Adjustments ............................................................................................................ 5
4.1 Voice Circuits ....................................................................................................................... 6
4.2 2175Hz Decoder Circuits...................................................................................................... 6
4.3 Logic Circuits........................................................................................................................ 6
4.4 Monitor Function Circuits..................................................................................................... 7
4.5 RX Squelch Function Circuits .............................................................................................. 7
6.1 Adjustments ........................................................................................................................ 15
6.2 SW1 Dip-switch Positions .................................................................................................. 15
6.3 Radio Connections .............................................................................................................. 15
6.4 Line Connections ................................................................................................................ 15
6.5 DB25 Cable Color codes .................................................................................................... 16
2 Vega’s TRA223
1 General
The Vega TRA223 tone -remote adapter provides a reliable means of remotely controlling two-way-radio base stations. The adapter can be used in conjunction with all Vega consoles, or other manufacturers' (such as Motorola and MA-COM Ericsson GE) remote consoles, which use the industry-standard sequential tone -keying format.
The TRA223 provides the following features:
PTT Relay Monitor Relay PTT and Monitor LED indications Hardware gain control Front panel test points and level setting potentiometers Three monitor modes
The TRA223 is interconnected to the distant remote control console(s) by any voice-grade transmission medium such as a microwave link, a leased telephone line, or a twisted-pair 600-ohm line. All TRA223s are capable of decoding the PTT (push-to-talk/transmitter-on) tone sequence and the voice-plus-tone signals during transmission. The tone portion of the voice-plus-tone signal is removed from the transmitted voice. TRA223 are prepared for conversion from two-wire-line operation to four-wire-line operation via a front panel DIP-Switch. In the four -wire mode, the panels are full duplex capable.
The TRA223 provides a “monitor” decode function that operates a relay used for turning off subaudible­tone-decoder circuits in the radio receiver, allowing the console operator to monitor the channel for other users before transmitting. (Required by FCC regulations on stations equipped with Continuous-Tone­Coded-Squelch-Signaling)
Transient protection has been provided near all audio inputs and outputs. This is adequate for nearly all transients.
The TRA223 line transformers are not designed to operate on lines carrying direct current. If a DC voltage is on the line, isolate with external capacitors. If the line termination must conduct direct current, install a 600:600-ohm transformer designed for the current involved.
1.1 Accessories
The TRA223 can be ordered with several optional accessories. TO-23 – Transformer isolation on transceiver interface DSP223RACK – 1 unit high rack shelf to hold up to two TRA223 units Power Supply
nel
Connector
2 Installation
POWER
GND
+12GND
RADIO
2.1 Power Supply
The TRA223 requires a 12 to 16 volt DC, 500ma, of clean power. Two connectors are provided to connect the unit to power. The first is a 2.5mm plug receptacle on the rear left of the unit. The positive terminal is the center conductor. The second power connection option is the DB25 connector. Figure 1 shows the pin out of this connector. Connect an external 12 to 16 volt DC supply with the positive connected to Pin 20 and the Ground connected to Pin 7.
DB25 Rear Pa
Figure 1
LINE
3-RX+ 4-TX+ 5-TX­6-RX-
1-PTT NC 20-+POWER 14-PTT NO 8­2-PTT COM 21­15-MON NC 9­3-MON NO 22­16-MON COM 10-SQUELCH 4- 23­17- 11­5- 24-RX+ 18- 12-RX­6- 25-TX+ 19- 13-TX­7-GROUND
2.2 Line Connection
The line connector Figure.2 is the right most connector on the rear of the TRA223. Connect the two-wire leased line to pins 4 and 5 of the RJ-45 modular connector, making sure that SW­1 position 1 is “ON” and position 2 is “OFF”. For four-wire operation, move SW-1 position 1 is “OFF” and position 2 is “ON”, connect the outgoing line to pins 4 and 5, and the receive pins to 3 and 6.
Note: Pins 4&5 of the Line connector are the RX audio from the radio. They are transmitted back down the line to the console. Pins 3&6 of the Line connector are inputs from the console and the audio present on this pair will be sent to the radio.
SW-1 on the front of the TRA223 control 2 or 4 wire operation. Set the Dipswitches according to your connection requirements.
2 Wire / 4 Wire Selection: SW1-1 SW1-2 2 Wire ON OFF 4 Wire OFF ON
2.2.1 Full Duplex
The TRA223 is shipped from the factory set to 2-wire half duplex, for Full-duplex set SW1 position 3 to “ON”.
1 2 3 4 5 6 7 8
1)
2)
3) RX +
4) TX +/ (RX + 2W)
5) TX -/ (RX - 2W)
6) RX -
7)
8)
Connector View
Figure 2
4 Vega’s TRA223
1 2 3 4 5 6
5) Radio TX+
6) Power
2.3 Radio Connection
2.3.1 TX Audio Connection
The TRA223 is shipped from the factory with a single ended connection for TX Audio to the radio. If the microphone input of the radio is a high-impedance type, shielded cable is recommended. If the radio has a high-level microphone input, move SW-1 position 6 to “OFF”, otherwise SW-1 position 6 sho uld stay in the “ON” position.
TX Audio is available from the TX+ pin on the DB25 or can be accessed on the smaller 6-pin rear connector. The 6 Pin connector pin out appears in Figure 3. The optional TO-23 provides balanced 600-Ohm I/O to the radio, balanced audio is only available on the DB25 connector on the rear panel; see Figure 1 for pin out.
1) Ground 2) PTT-NO
3) PTT-COM 4) Radio RX+
6 Pin Rear Connector Pinout
2.3.2 RX Audio Connection
The TRA223 is shipped from the factory with a single ended high impedance connection for RX Audio from the radio. If a high-impedance point in the receiver is used, shielded cable is recommended. To connect a receive audio from a speaker output to the TRA223 set the front panel Dip -switch SW1 position 5 to “ON”.
Note: That when the speaker output is used, the radio volume control will affect the audio levels of the TRA223.
Single ended RX audio can be connected at pin 24 of the rear DB25 or pin 4 of the rear 6-pin connector can be used. The audio source must be after the squelch circuit, to prevent sending continuous noise to the remote console. The optional TO-23 provides balanced 600 -Ohm I/O to the radio, balanced audio is only available on the DB25 connector on the rear panel; see Figure 1 for pin out.
Figure 3
2.3.3 TO- 23 Balanced Transformer option
To connect the TRA223 to a radio that requires balanced audio connections the main PCB has been designed for the option TO-23. To install the TO-23 option remove main PCB from case and solder transformer P/N 3180246 into T3 and P/N 3180259 into T4, remove R98, R99, R100 and R101.
Note: For 600 ohm RX input impedance; replace R77 with a 680 -ohm resistor.
2.3.4 PTT Connection
Connect the radio PTT circuit to the PTT relay contact terminals of the panel. This can be done on either the rear DB25 or the 6 pin connectors. Usually the common of the relay contact switch is grounded and the normally open contact connects to the PTT input. It is also possible to ground the common of the relay internal to the unit by setting SW1 position 7 to “ON”.
2.3.5 Monitor Connection
Connect the radio MON circuit to the MON relay contact terminals of the panel. This can only be done on the rear DB25 connector. Usually the common of each relay contact switch is grounded and the normally open contact connects to the MON input. It is also possible to ground the common of the relay internal to the unit by setting SW1 position 8 to “ON”.
2.3.6 RX Squelch
The TRA223 has a RX squelch feature that allows gating of the receiver audio to the remote consoles when the COR input is pulled. The COR input is active High or Low, R103 installed is active LOW, R104 installed is active HIGH. Front panel Dip -switch SW1 position 4 controls the Squelch feature.
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