(ii) Software RTB.
RTB phase shift: 180 degrees +/- 10 degrees, lagging.
RTB duration: between 80mSec to 150mSec.
CTCSS tone frequency dependent. See Table 2.1
RTB amplitude variation 0.5dB.
(across CTCSS tone set).
2.4.2.3 Decoder
(i) Tone-Set.
as per Encoder.
(ii) Bandwidth.
+/- 3.0% max.
(iii) Deviation Sensitivity.
Better than 6% of system deviation (for decode with full RF quieting).
(iv) Noise Immunity.
Less than 500mSec dropout per minute for l0dB sinad
(CTCSS tone deviation 10% of system and sinad signal of 60% deviation at
1kHz).
(v) False Decode Rate.
Less than 5 false decodes per minute (no carrier input).
(vi) Talkoff.
I nterfering tone deviation for loss of decode (CTCSS tone deviation 10% of
system).
Full quieting RF signal: 310Hz to 3kHz 90% of system deviation (for no
dropouts).
20dB sinad RF signal: 320Hz to 3kHz ; 90% of system deviation (for no
dropouts in one minute).
12dB sinad RF signal: 350Hz to 3kHz; 90% of system deviation (for no dropouts
in one minute).
(vii) Response Time; Less than 250mSec.
(With a full quieting signal of 67Hz at 10% of system
deviation; 67Hz gives the slowest times).
(viii) De-response time; Less than 250mSec.
2.4.2.4 Speech Rejection Filter
(i) Response.
300 Hz0 dB.
250 Hz<-36 dB.
Section 2 Page 8
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