C04d_AM_VHF_AviationBase_Tech. Specs_12760426Q0071.pdf
PDF 74 KB Posted
- Solicitation number
- 12760426Q0071
- Issued by
-
Department of Agriculture Forest Service
About this file
This document contains technical specifications for a VHF/AM Aviation Ground Station designed for rack-mount installation in standard communication facilities. The equipment operates in the 118.000 to 136.990 MHz frequency range with selectable channel spacing of 25 kHz and 8.33 kHz, supporting Amplitude Modulation (A3EJN). The ground station provides RF output power of 5 W to 50 W, software-adjustable and duty-cycle dependent, with a transmitter duty cycle of 20% and receiver sensitivity of less than 1.5 µV for 12 dB SINAD. Physical specifications include standard 19" EIA rack-mount width with 1U to 3U height (1.75 to 5.25 inches), depths of 12" to 16", and weights ranging from 11 to 30 lbs depending on built-in power supplies and heat sinks.
The unit supports dual-source power input (100-230 V AC and/or 24-48 V DC for battery backup) and operates across a wide temperature range of -20°C to +60°C with passive or active forced-air cooling options. Key performance requirements include frequency stability of ±1.0 ppm or better, modulation depth greater than or equal to 85% with distortion of 10% or less, adjacent channel power rejection of 50 dB at 8.33 kHz and 60 dB at 25 kHz, and spurious/adjacent rejection of 70 to 90 dB. Audio interfaces include 600-ohm balanced line in/out with adjustable levels and microphone input sensitivity rated for -10 to 0 dBm. The equipment features N-type female RF connectors, configurable Data/Control Ports for Radio over IP (RoIP) and digitized radio voice traffic, VSWR protection for antenna mismatch (typically ≤6:1), and standard grounding provisions for facility earth ground connection.
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Technical Specifications
VHF/AM Aviation Ground Station
• Rack Unit (RU) Size: Standard 1U to 3U height, depending on power amplification (usually 1.75 to 5.25 inches).
• Width & Depth: Standard 19" EIA rack-mount width; depths typically ranging from 12" to 16".
• Weight: 11 to 30 lbs (5 to 3.6 kg) depending on built-in power supplies and heat sinks.
• Operating Temperature: -20C to +60C.
• Cooling: Passive convection (for low power) or forced-air front-to-rear active cooling (for high output).
• Frequency Range: 118.000 to 136.990 MHz
• Channel Spacing: Selectable 25 kHz and 8.33 kHz.
• RF Output Power: Typically, 5 W to 50 W, software-adjustable and duty-cycle dependent.
• Impedance: 50 Ω.
• Transmitter Duty Cycle: 20% (Continuous RX:TX = 4:1)
• VSWR (Antenna Mismatch): Protected against antenna mismatch, typically rated for less ≤ 6:1 without damage.
• Input Voltage: Dual-source compatibility is common—100 - 230 V AC (nominal) and/or 24 V DC to 48 V DC for battery backup
• Modulation Types: Amplitude Modulation (A3EJN).
• Modulation Depth & Distortion: Depth ≥ 85%; Distortion ≤ 10%
• Receiver Sensitivity: < 1.5 mu V for 12 dB SINAD.
• Frequency Stability: ±1.0 ppm or better to ensure compliance with regulatory standards.
• Adjacent Channel Power: ≥ 50dB at 8.33 kHz; ≥ 60 dB at 25 kHz.
• AF-Line Input Level: -20 to +10 dBm (adjustable).
• AF-Line Input Impedance: 600 Ω ± 10% (balanced).
• Microphone Input Sensitivity: Local dynamic microphone rated for -10 to 0 dBm (or 2 to 10 mV at 200 Ω (balanced).
• Spurious & Adjacent Rejection: 70 to 90 dB critical for preventing interference in co-located environments.
• RF Connectors: N-type Female (rear panel).
• Data/Control Ports: Configurable for Radio over IP (RoIP) and digitized radio voice traffic.
• Audio Interfaces: 600-ohm line in/out (adjustable levels) for standard communications consoles.
• Grounding: Standard grounding stud typically located on the rear chassis for connection to the facility's earth ground.
File details come from the government source that posted it. Updated .