DE
DANIELS
ELECTRONICS
VT-3H040 VHF Enhanced Transmitter Instruction Manual
1-5
1.4.2
Audio Specifications
Audio Input:
Balanced 600 ohm or unbalanced (optional).
Input level sensitivity, -25 dBm to 0 dBm.
Audio Response:
Pre-emphasis (6 dB per octave); +1.0 to -2.0 dB
from 300 Hz to 3 kHz;
Flat Audio Response:
+1 to -1 dB from 100 Hz to 3 kHz.
Audio Deviation:
Preset to ±3.0 kHz with a 1 kHz tone.
Subtone Audio Input 1:
0.5 Vpp at 200 Hz for ±500 Hz deviation
(internally adjustable).
Subtone Audio Input 1 Frequency range:
60 Hz to 300 Hz.
Subtone Audio Input 2:
0.5 Vpp at 100 Hz for ±500 Hz deviation
(internally adjustable).
Subtone Audio Input 2 Frequency range:
DC to 150 Hz.
Direct Modulation Input:
0.5 Vrms at 1 kHz or ±3 kHz deviation.
Direct Modulation Frequency range:
DC to 5 kHz.
Audio Distortion:
Less than 2.5% THD; 1 kHz tone at 1.5 kHz or
3 kHz deviation (-40°C to +60°C).
Hum and Noise:
Better than 55 dB
(test receiver band limited: 400 Hz to 30 kHz).
