Audio Frequency Response
i)
25kHz Channel Spacing.
1 to -3dB of a +6dB per octave pre-emphasis, over 300 to 3000Hz (without
CTCSS).
With CTCSS, 1.5 to -3dB.
ii)
12.5kHz Channel Spacing.
1 to -3dB over 300 to 2550Hz (without CTCSS).
1.5 to -3dB over 300 to 2550Hz (with CTCSS).
Transmitter Rise Time
Less than 40mSec from operation of the PTT to achieve 70% of output power.
2.4 SIGNALLING
2.4.1
PRM80 Selcall Specification
2.4.1.1
ENCODER
(i)
Tone Deviation.
Factory preset to 80% or system deviation adjustment range typically 33% to
over
100% of system deviation.
(ii)
Tone Distortion.
Not greater than 10% at TX VCO input.
(iii)
Tone Frequency Range.
63 possible tones in the range 459Hz to 2937Hz. See Table 2.2 for details.
(iv)
Tone Amplitude Variation.
Not greater than 6dB over 459Hz to 2937Hz.
(v)
Tone Frequency Error.
Not greater than 1.0% -30C to +60C.
(vi)
Tone Period.
14 possible durations from 20 to 255mSec. Accuracy greater than 3.0%. The
required
tone period may be selected from the following:
a)
20 mSec.
b)
33 mSec.
c)
40 mSec.
d)
60 mSec.
e)
70 mSec.
f)
80 mSec.
g)
100 mSec.
h)
120 mSec.
i)
140 mSec.
j)
150 mSec.
k)
200 mSec.
1)
210 mSec.
m)
250 mSec.
n)
255 mSec.
Section 2 Page 5
