Emergency situations require that first responders have adequate communications inside buildings. EMR Corporation’s provides VHF and UHF bi-directional amplifiers that can be the backbone of an effective distributed antenna system (DAS). The 840622/72 is a 60 dB gain VHF repeater with 37 dB of composite output power. NFPA compliant, 1SC-10 upgrade. Can be used with single or multiple frequency pairs with minimum 2.75 MHz separation. For multiple pairs, maximum UL and DL passband is 2 MHz with 3 MHz guard band. Warning. This is not a consumer device. It is designed for installation by FCC licensees and qualified installers. You must have an FCC license or express consent of an FCC licensee to operate this device. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation.