TN855 CI-DSP-223 Telex (Vega) DSP Tone-Remote Adapter
MT-3/4 Radio Systems
TECHNICAL NOTES
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TN855, REV 12-0-0, © Nov 2018
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The Telex DSP-223 tone-remote adapter provides a reliable means of remotely controlling Codan base stations
and repeaters. The adapters can be used in conjunction with tone-remote control consoles which use the industry-
standard sequential tone keying format. The DSP-223 adapters are 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 DSP-223 adapters are capable of decoding the PTT 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.
All models are prepared for jumper-plug conversion from four-wire-line operation to two-wire-line operation. In the
four-wire mode, the panels are full duplex capable.
The Telex DSP-223 tone-remote adapter provides the following features:
• PTT Relay and Monitor Relay
• 99 digit front panel display
• PTT, Monitor and Power LED indicators
• F1 and F2 Relays (programmable to any function tone)
• Digital outputs for channel selection of the Codan Tx and Rx modules (programmable to any function tone)
• CTCSS encode generation (64 frequencies available)
• Hardware and software gain controls
• Local handset port for monitoring activity through the unit and transmission back to the base or to the radio
• Front panel test points and level set pots
• RS-232C port on front panel for software confi guration via Windows application
• Ability to pass through to a second tone adapter
• Single or Dual function tone recognition (16 or 100 function tones)
• Morse code encoder for Automatic station identifi cation
• Voter / Ring Down Tone Generation
All models have been factory tuned to the following frequencies:
Guard Tone / PTT Tone: 2175 Hz
Monitor Function Tone: 2050 Hz
Frequency Select Function Tones (where used)
F1: 1950 Hz F4: 1650 Hz F7: 1350 Hz F10: 1050 Hz F13: 750 Hz F16: 450 Hz
F2: 1850 Hz F5: 1550 Hz F8: 1250 Hz F11: 950 Hz F14: 650 Hz
F3: 1750 Hz F6: 1450 Hz F9: 1150 Hz F12: 850 Hz F15: 550 Hz
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