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150-174 MHz 60dB Bi-Directional AmplifierGSA Item
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EMR Corporation - 150-174 MHz 60dB Bi-Directional Amplifier
TESSCO SKU : 391586 Mfg Part #: 840622 Qty/UOM : 1 EACH UPC: 391586
Emergency situations require that first responders have adequate communications inside buildings. EMR Corporation provides VHF and UHF bi-directional amplifiers that can be the backbone of an effective distributed antenna system (DAS). The 840622 is a 60dB gain VHF repeater with 31dB of composite output power.

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.

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View Worksheet

GS-35F-0548P70 - Information Technology
Ask CustomerWhat is the single or multiple Base TX (Downlink) & RX (Uplink) pairs that will be used with this repeater?
Bands SupportedVHF
Frequency Range150-174 MHz
Gain60 dB
Composite Power Uplink31 dBm
RF ConnectorsN Female
Composite Power Downlink31 dBm
Maximum Passband1.5
Passband Separation (MHz)3.5
Noise Figure (U/L, D/L)4dB
Item Length16 in
Item Width12 in
Item Height7.25 in
Temperature Range-30-60 deg C
Item Weight52 lb
Mfg. Warranty5 Years
EMR bi-directional repeaters provide two way (uplink and downlink) filtering and amplification of either VHF or UHF signals in buildings, tunnels or areas that are shaded from adequate RF signal coverage. In addition to the repeater, other devices needed for a distribution system include transmission line, power splitters, hybrid & directional couplers and indoor antennas. The use of radiating cable can also be used, particularly in tunnels and long corridors. The choice of distribution method depends on the nature of the structure in which signal enhancement is required. Standard passbands are specified in the table below. Custom passbands are available.

  • System output power is a function of the number of carriers incident on the system, the signal level of these carriers to the signal enhancement system, and the insertion loss of the filters within the bidirectional system.
  • System Noise Figure is the sum of the amplifier NF and the filter losses prior to the amplifier.
  • The filter losses are dependent on the passband width for the uplink frequencies, the passband width for the downlink frequencies, and the stop band between them.
  • Options are available for 12 VDC, 24 VDC, 48 VDC, 220 VAC
  • Passband and stop band widths can and do vary. Any of the standard bi-directional systems can be custom configured to different passband and/or stop band widths.

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