DE
DANIELS
ELECTRONICS
VT-4B150 VHF Project 25 Digital Base Transmitter Instruction Manual
1-3
Frequency Stability:
Standard: ±2.5 ppm, -30°C to +60°C.
Channel Selection:
In 5.0 or 6.25 kHz increments selected with Radio
Programming Software package.
Standby Current:
100 mA
DOC Type Approval:
TBA
FCC Type Acceptance:
TBA
1.4.2
Audio Specifications
Audio Input:
Unbalanced, 600 or 47k5 ohm selectable input impedance.
Audio Response:
Pre-emphasis (6 dB per octave); +0.5 to -2.0 dB from 300 Hz
to 3 kHz;
Audio Deviation Limiting:
+/- 2.5 kHz, +/- 5.0 kHz
Audio Distortion:
Less than 3% THD; 1 kHz tone at 1.5 kHz or 3 kHz deviation
(-40°C to +60°C).
Hum and Noise:
-45 dB typical
1.4.3
Physical Specifications
Physical Dimensions:
Width:
Height: Depth:
7.1 cm (2.8 in) 12.8 cm (5.05 in)
19 cm (7.5 in)
Module Weight:
1.5 kg (3.3 lbs.)
Corrosion Prevention:
Anodized aluminum construction. Stainless steel hardware.
Selectively conformal coated glass epoxy 2 and 4 layer printed
circuit boards. Gold plated module connectors.
Module Design:
Compact Eurostandard modular design. Plug-in modules
mate with Daniels standard M3 repeater subrack. Subracks /
modules comply with IEEE 1101, DIN 41494 and IEC 297-3
(mechanical size / modular arrangement).
External Connections:
RF Connection: type N connector located on the transmitter
module front panel. Motherboard Connections (Audio,
Power, and Control) are made through a 48 pin, gold plated,
type F connector on the rear of the transmitter module. User
