AAT Digital VHFI Low Band Transmitters are designed using reliable modular systems that offer flexible configurations. All VHF systems incorporate a user friendly touchscreen display. Remote monitoring is provided via Ethernet, SNMP, and Remote Samples. All units can easily be paired with any of our Modulators, Transmodulators, Encoders, or Receivers.
Main Features:
• Full Color Touch Screen Display
• Internal RF Isolator (VHFIII)
• Two Stage Amplification
• Class A/AB Operation
• Efficient Transistors and Power Supplies
• Extensive Monitoring via Ethernet, SNMP, and Remote Samples
• Two Year Warranty
RF CHARACTERISTICS
• Frequency Range: VHF 50 – 230 MHz, UHF 470 - 860 MHz
• Input Power: 0 dBm into power amplifier from modulator
• Nominal Output Power (8VSB) VHF: 25W, 100W, 250W, 500W, 1kW, 2kW, 3KW, 4KW, 5KW
• Power Level: Adjustable 10 – 100%
• Input Impedance: 50 Ω into amplifier, BNC female
• Output Impedance: 50 Ω, N or 7-16 DIN female (dependent on power level)
• Modulation: 8VSB, QAM, DVBT/H, etc (output power will change between standards)
• Signal and Noise: MER >36 dB typical, BER >38 dB typical, SN >40 dB typical
• Phase Jitter: >104 dB
• Shoulders: >-50 dB typical, ATSC mode compliant to ATSC A53/B
ELECTRICAL
Flexible AC Input: VHF PA:
• 25W/100W/250W/500W - 90-264Vac
• 1kW/2kW - 180-264Vac
INTERFACE
DB25 Remote Port
• Control: RF carrier on/off, RF power up/down, reset
• Monitor: Forward/reflected RF level, control PCB Vcc
• Flags: Overdrive, VSWR (adjustable trip point), high temperature
Ethernet
• Control: RF carrier on/off, RF power up/down, AGC/manual mode, change VSWR trip point, reset
• Monitor: Forward/reflected RF level, pallet voltage, RF input level, temperature, VSWR trip point, model/serial number
• Flags: Carrier on/off, overdrive, pallet voltage, VSWR, RF input, temperature, AGC / manual
SNMP
• Control: RF carrier on/off, RF power up/down, AGC/manual mode, change VSWR trip point, reset
• Monitor: Forward/reflected RF level, DC pallet voltage, RF input level, temperature, pallet current, attenuation, run time, RF fault, model/serial number
• Flags: Overdrive, VSWR, temperature, SNMP error
PHYSICAL FEATURES
• Minimal Rack Space VHF PA: 3U – 25W; 5U – 100W/250W/500W; 6U – 1kW; 12U – 2kW x 25” (D) x 19” (W)
• Modulator: 2U
• Lightweight Enclosures: Aluminum
• Operating Temperature: 0 to +45° C
• Humidity: 90%, non-condensing
