Codan Radio Communications VT-3A130-F 25kHz AM TRANSMITTER User Manual 1

Codan Radio Communications 25kHz AM TRANSMITTER 1

USERS MANUAL

User's Guide The VT-3A130 Transmitter is a synthesized multichannel AM transmitter designed to interface with the MT-3 Repeater Systems, while still maintaining MT-2 system compatibility. Both MT-3 systems are characterized by dependable low maintenance performance under the most severe environmental conditions. In addition, all units are burnt-in for 24 hours and are accompanied by a complete test report. The VT-3A130 Transmitter operates in the 118 - 137 MHz aviation band. The transmitter’s frequency stability is controlled by an OST-3A138 AM Enhanced Synthesizer. The Synthesizer module can be programmed for up to 16 channels. A channel programmer can preprogram the first 15 channels; channel 16 can be programmed from the front panel and channel 1 can be programmed by the four BCD switches located on the MT-3 AM Transmitter Main Board. The VT-3A130 modular transmitter family is compatible with all Daniel’s subrack and base station enclosures. Transmitter Features Compatibility MT-2 Series and MT-3 Series Radio Systems Frequency Generation Synthesized (internal plug-in module) Channel Selection In 25 kHz increments selected by four BCD switches Preset capability for 16 channels selectable through external control Front Panel Control One 3 position switch: - NORM (repeat mode) - OFF - KEY TX PTT Activation: - Active to ground with time-out timer - Active to ground without time-out timer - Microphone activated without time-out timer - Front Panel switch (KEYED) without time-out timer, (NORM) with or without time-out-timer. Amplifier Enable Active to ground
Performance Specifications Overall Transmitter Specifications Parameter Specification Reference Operating Temperature Range -30°C to +60°C Optional -40°C to +60°C Optional -50°C to +40°C Type MT-3 Series Transmitter Family VT-3A130 Frequency Range 118 - 137 MHz System Impedance 50 ΩType N RF Power Output 1.0 – 3.0 Watts adjustable (carrier only) RTCA DO-186A Paragraph 2.3.1 Emission of Radio Freq. Energy More than 50 dB below carrier RTCA DO-186A Paragraph 2.3.7(b) Carrier Noise Level More than 45 dB below carrier RTCA DO-186A Paragraph 2.3.6 Duty Cycle 100%; Continuous operation from -30°C to +60°C Optional -40°C or -60°C Channel Spacing 25 KHz Emission Identifier 6K00A3E and 5K6A3E Amplitude Modulation Operating Humidity 95% Relative Humidity (Non-condensing) at +25°C Operating Voltage +13.8 VDC Nominal +9.5 VDC regulated Active Current +13.8 VDC supply < 2A @ 25°C, at 3 Watts RF output <2.5A -40˚C to +60˚C Channel Selection In 25 kHz increments selected by four BCD switches. Preset capability for 16 channels selectable through external control. Frequency Stability Standard: ±1 ppm -40°C to +60°C ± 2 ppm, -50°C to -40°C RTCA DO-186A Paragraph 2.3.11 FCC Type Approval H4JVT-3A130-F Industry Canada Certification 142A-VT3A130F PTT Time-Out-Timer Selectable 1 seconds to 8 hours.(factory set 5 min) Standby Current (9.5 VDC) and Rise time Refer to Transmitter Standby Modes in Theory of Operation
Audio Specifications Parameter Specification Reference Audio Input -30 to 0 dBm into a 600Ω balanced load Audio Frequency Response Flat audio; +1/-5 dB: 350 Hz - 2.5 kHz RTCA DO-186A Paragraph 2.3.5.1 Audio Frequency Distortion 1 kHz tone, 50kHz Low Pass Filter Less than 5%+25˚C at 85% modulation Less than 10% -40˚C to +60˚C at 85% modulation Less than 15% >+40˚C to +60˚C RTCA DO-186A Paragraph 2.3.4 Synthesizer Specifications RF Power Output: +3 dBm Nominal Physical Specifications Physical Dimensions: Width: 7.1 cm (2.8 in) Height: 12.8 cm (5.05 in) Depth: 19 cm (7.5 in) Module Weight: 1.4 kg (3.0 lb.) 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 MT-3 repeater subrack. Subracks and 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 connection is made through a mated “mother board” assembly of the repeater subrack. Type F standard connector complies with DIN 41612 Level 2 (200 mating cycles, 4 day 10 ppm SO2 gas test with no functional impairment and no change in contact resistance). Frequency Select Handle Performance Specifications Temperature Range: -30°C to +60°C.(Optional -40°C to +60°C) Supply Voltage: +9.5 VDC Supply Current: Less than 35 mA operate; less than 4.0 mA standby mode

Navigation menu