The Johansson 7784 is a split-band distribution amplifier designed for professional antenna systems. It accepts four distinct frequency bands simultaneously — BI/FM, BIII/DAB, and two independently switchable UHF inputs — each with its own gain adjustment ranging 10–35 dB. A detachable external power supply is included.

The amplifier is RED compliant and fully LTE-ready, with switchable UHF band limiting at 694 MHz or 862 MHz. A dedicated –30 dB test output allows signal monitoring without interrupting the main distribution chain. VDC remote power is selectable at OFF, 12 V or 24 V for powering downstream LNBs or masthead amplifiers.

Key Features

• 4 inputs: BI/FM (47–108 MHz), BIII/DAB (174–240 MHz), UHF1 and UHF2 (470–694 or 862 MHz, switchable)
• Split-band design with interstage attenuators and 20 dB dynamic range per band
• Separate gain adjustment per input: 10–30 dB for BI/FM and BIII/DAB; 15–35 dB for UHF1/UHF2
• Switchable LTE filter (694 or 862 MHz cut-off)
• –30 dB monitoring test port
• VDC remote power: OFF / 12 V / 24 V switchable
• RED compliant (selectivity classes 0 and 1)
• Detachable power supply included
• Compact housing

Product Benefits

• Independent gain controls per band prevent strong signals on one input from degrading others
• High input power threshold makes input overload virtually impossible in demanding installations
• LTE filter switching lets the installer adapt to local spectrum allocation without hardware changes
• Remote power output eliminates the need for a separate power supply at a masthead unit
• The test port enables level checking during commissioning without disconnecting any cables

Technical Specifications

• Model: Johansson 7784
• Inputs: 4 (BI/FM, BIII/DAB, UHF1, UHF2)
• Outputs: 1 main + 1 test port (–30 dB)
• Frequency range: BI/FM: 47–108 MHz; BIII/DAB: 174–240 MHz; UHF1: 470–694 or 862 MHz (switchable); UHF2: 470–694 or 862 MHz (switchable)
• Gain (dB): BI/FM: 10–30; BIII/DAB: 10–30; UHF1: 15–35; UHF2: 15–35
• Max. input power (dBµV, –60 dBc): BI/FM: 94; BIII/DAB: 92; UHF1: 96; UHF2: 96
• Max. output power (dBµV, –60 dBc): BI/FM: 118; BIII/DAB: 119; UHF1: 118; UHF2: 118
• Noise figure (dB): BI/FM: 4.5; BIII/DAB: 4; UHF1: 5.5; UHF2: 5.5
• Return loss (dB): >10
• Test port (dB): –30
• Remote power (V): OFF – 12 V – 24 V
• DC mode (mA): BIII/DAB: 100; UHF1: 100; UHF2: 100
• RED selectivity classification: 0 and 1
• Supply voltage (VAC): 100–240
• Power consumption (W): 23
• In the box: 1 x Johansson 7784 amplifier, 1 x power adapter cord, 1 x instruction manual

Why You'll Love It

• More efficient than its predecessor — same rack space, better performance
• Compact housing fits neatly into an existing head-end cabinet
• All signal levels are independently tunable, so the output is balanced for every outlet in the building
• Full LTE readiness future-proofs the installation against spectrum refarming