(ii)
Software RTB.
RTB phase shift:
180 d/- 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 Hz 0 dB.
250 Hz <-36 dB.
Section 2 Page 8
