TN855 CI-DSP-223 Telex (Vega) DSP Tone-Remote Adapter
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 4 of 6
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TN855, REV 12-0-0, © Nov 2018
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Telex DSP Programming:
The Telex DSP-223 is typically factory programmed for the customers requirements, however, reprogramming of
the Telex can be done with the Telex software contained on the CD that comes with the radio system. Ensure that
the embedded fi rmware of the Telex is the same version as the software. To determine the embedded fi rmware
version, turn the Telex on and the words DSP-223 will scroll across the display, then the fi rmware version will
appear. Connect the PC to the Telex programming port on the front panel of the Telex tone remote adapter using the
cable supplied with the Telex. New software and fi rmware for the Telex can be downloaded from www.telex.com.
The software shown in Figure 4 is version 2.8 and is programmed for channels 1 through 9 with CTCSS tones of
100.0 Hz on channel 1, 203.5 Hz on channel 2 and no CTCSS on channels 3 through 9. Codan radio systems do
not require the “Set Gains” or “TX Filters” sections to be accessed on the Telex DSP-223 software. The CTCSS
tone is shown as always on, to allowing CTCSS to be transmitted when testing, using the microphone on the
front panel of the transmitter module. On Codan MT-4R and MT-4D P25 radio systems, the CTCSS to Subtone
connection is not connected and CTCSS tones are generated internally in the transmitter.
Figure 4: Telex DSP-223 Programming Software
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