P25 Digital VHF Transmitter Instruction Manual
IM21-001
General Information
3
PTT Activation:
• Active to ground; Microphone activated;
• Front Panel switch: KEY TX
PTT Time-Out-Timer:
Programmable from 1 sec. to 8 hrs or in
fi
nity. (Default 5 min.),
using Radio Service Software package.
Standby Current:
Transmitter with no
Standby
≤
75 mA
encryption modules installed
Transmitter with encryption
Standby
≤
105 mA
modules
installed
DOC Type Approval:
TBA
FCC Type Acceptance:
TBA
Audio Speci
fi
cations
Audio Input:
Balanced, 600
Ω
or optional unbalanced input
(600
Ω
or 15000
Ω
selectable input impedance)
Audio Response:
Pre-emphasis (6 dB per octave); +1 to -3 dB
from 300 Hz to 3 kHz
Audio Deviation Limiting:
+/- 2.5 kHz, +/- 5.0 kHz
Audio Distortion:
< 3% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviation
Hum and Noise:
-34 dB typical
