Service Manual

Page 1.24
2 ~ SERVICE PHILOSOPHY
Decoder
Bandwidth Not greater than ±3.0%
Deviation Sensitivity Less than 6.0% of system deviation (for decode with full RF quieting)
Noise Immunity Less than 500ms dropout per minute at 10dB SINAD
(CTCSS tone deviation 10% of system deviation. RF deviation 60% at
1000Hz).
False Decode Rate Less than 5 false decodes per minute (no carrier input)
Talk-off For no dropouts in one minute, interfering tone at 90% of system deviation
(CTCSS tone at 10% of system deviation).
Full quieting signal: 310Hz to 3000Hz
20dB SINAD RF signal: 320Hz to 3000Hz
12dB SINAD RF signal: 350Hz to 3000Hz
Response Time Less than 250ms (full quieting/tone >100Hz)
Less than 350ms (full quieting/tone <100Hz)
De-Response Time Less than 250ms
Reverse Tone Burst none
1.7.4.2 FFSK
1200 Baud: 1200 / 1800 Hz MPT1317 based
2400 Baud: 1200 / 2400 Hz MPT1317 based
1.7.4.3 Selcall
The following tone sets are supported as per tables below:
• ST-500: CCIR, EEA, ZVEI, DZVEI, EIA
• ST500/CML: ZVEI_3, DZVEI
• CML: CCIR, EEA, ZVEI
• SIGTEC: CCIR, CCIRH, EEA, ZVEI_1, XVEI_2, ZVEI_3, NATEL, EIA
• SEPAC: CCIR, EEA, ZVEI_1, ZVEI_2, ZVEI_3, EIA