The Johansson 7785 is a multiband split-band distribution amplifier with five individual inputs covering BI/FM, BIII/DAB, UHF1, UHF2, and SAT frequency bands. Each input has independent gain adjustment, allowing precise optimisation of each signal path in a single head-end unit.

The amplifier is fully LTE-ready and RED compliant (selectivity classifications 0 and 1). It includes switchable VDC remote power, a detachable power supply, and a -30 dB test output. The UHF1 and UHF2 inputs can be switched between 470–694 MHz and 470–862 MHz to accommodate different regional frequency plans or LTE filter requirements.

Key Features

• 5 inputs: BI/FM (47–108 MHz), BIII/DAB (174–240 MHz), UHF1 (470–694 or 862 MHz, switchable), UHF2 (470–694 or 862 MHz, switchable), SAT (950–2400 MHz)
• 1 main output + 1 test port (-30 dB)
• Split-band amplifier with interstage attenuators and 20 dB dynamic range per input
• Switchable VDC remote power: OFF – 12V – 24V
• SAT DC mode: OFF – 13V – 18V – 22 kHz (selection: internal, power inserter, or external)
• RED compliant — selectivity classifications 0 and 1
• Detachable power supply included
• Compact housing

Product Benefits

• Five separate inputs with independent gain control allow each band to be individually optimised within one compact unit, eliminating the need for separate per-band amplifiers
• Switchable UHF frequency range (694 or 862 MHz upper limit) adapts the amplifier to national frequency plans with built-in LTE interference rejection
• VDC switchable remote power supplies antenna pre-amplifiers or masthead amplifiers directly through the coaxial cable
• SAT DC mode supports LNB powering with 13V/18V switching and 22 kHz tone for satellite band/polarity selection
• RED compliance ensures the amplifier meets EU radio equipment directive requirements

Technical Specifications

• Inputs: 5 (BI/FM, BIII/DAB, UHF1, UHF2, SAT)
• Outputs: 1 main + 1 test port (-30 dB)
• Frequency Range — BI/FM: 47–108 MHz
• Frequency Range — BIII/DAB: 174–240 MHz
• Frequency Range — UHF1: 470–694 or 862 MHz (switchable)
• Frequency Range — UHF2: 470–694 or 862 MHz (switchable)
• Frequency Range — SAT: 950–2400 MHz
• Gain — BI/FM: 10–30 dB
• Gain — BIII/DAB: 10–30 dB
• Gain — UHF1: 15–35 dB
• Gain — UHF2: 15–35 dB
• Gain — SAT: 10–35 dB
• Slope Adjustment — SAT: 0–10 dB
• Max. Input Power — BI/FM (-60 dBc): 94 dBµV
• Max. Input Power — BIII/DAB (-60 dBc): 92 dBµV
• Max. Input Power — UHF1 (-60 dBc): 96 dBµV
• Max. Input Power — UHF2 (-60 dBc): 96 dBµV
• Max. Input Power — SAT (-35 dBc): 97 dBµV
• Max. Output Power — BI/FM (-60 dBc): 118 dBµV
• Max. Output Power — BIII/DAB (-60 dBc): 119 dBµV
• Max. Output Power — UHF1 (-60 dBc): 118 dBµV
• Max. Output Power — UHF2 (-60 dBc): 118 dBµV
• Max. Output Power — SAT (-35 dBc): 115 dBµV
• Noise Figure — BI/FM: 4.5 dB
• Noise Figure — BIII/DAB: 4 dB
• Noise Figure — UHF1: 5.5 dB
• Noise Figure — UHF2: 5.5 dB
• Noise Figure — SAT: 7.5 dB
• Return Loss: >10 dB
• Test Port: -30 dB
• Remote Power (V): OFF – 12V – 24V
• DC Mode (mA) — BIII/DAB, UHF1, UHF2: 100 mA each
• DC Mode SAT (mA): OFF – 13V – 18V – 22 kHz (selection: internal, power inserter, or external)
• SAT Remote Power: 350 mA
• RED Selectivity Classification: 0 and 1
• Supply Voltage: 100–240 VAC
• Power Consumption: 29 W

Why You'll Love It

• Universal 100–240 VAC supply works across all European mains voltages
• Kit includes power adapter cord and instruction manual for a complete installation out of the box
• All five bands handled in one compact housing, simplifying head-end wiring compared to using multiple single-band amplifiers
• Far more efficient than its predecessor, reducing long-term operating costs