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Comba Class A Public Safety Fiber DAS Master Unit 700/800MHz w/4 Port, 32 Ch., -48VDC

Comba Class A Public Safety Fiber DAS Master Unit 700/800MHz w/4 Port, 32 Ch., -48VDC

Comba Class A Public Safety Fiber DAS Master Unit 700/800MHz w/4 Port, 32 Ch., -48VDC

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    • *These fields required. [2] May exclude very large size items because we offer free shipping so our actual cost may be too high due to the size/ weight of item to be able to match the price. [3] Request must be made before order placement. Not valid after order placed. Other restrictions may apply. Please contact us for details.

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    Free Lifetime Support. SKU / Model: RH7W22-D7848E4

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    Product Description

    Comba Critical Point Public Safety Class A Fiber DAS Master Unit (RH7W22D7848E4) operating on 700-MHZ and 800-MHz with 4 optical ports, 32 Channels, -48 VDC. Comba Telecom PS Fiber DAS Class A 700/800MHz (MU 4 ports, -48VDC) is a unique 32 channel public safety repeater backed by a manufacturer warranty of three years. The master unit amplifier features four optical ports.


    • Dual-band configuration supports 700MHz and 800MHz public safety bands.
    • Supports P25 P1/P2 digital and conventional analog communications simultaneously.
    • Up to 32 Channels.
    • 2W output power per band.
    • Channelized Auto Level Control (ALC) supported.
    • Channelized uplink squelch supported.
    • Web based GUI for intelligent configuration, SNMP supported.
    • Built-in mandatory isolation test to prevent oscillation.
    • NFPA 1221 compliant dry contact alarms.
    • NFPA 1221 compliant NEMA 4X enclosure.


    Supported Bands: 700MHz and 800MHz Public Safety Network Bands.
    Uplink Frequencies: 799-805 MHz and 806-824 MHz.
    Downlink Frequencies: 769-775 MHz and 851-869 MHz.
    Channel Bandwidth: 12.5/ 25/ 75 KHz.
    Optical Fiber: Single Mode.
    Optical Wavelength: 1550, 1310 + WDM.
    Master Unit Optical Output Power: -4 to -2 dBm.
    Maximum Optical Loss: 6.5 dB.
    Master Unit Fiber Connectors: SC/ APC.
    Number of Filters: 32.
    Total Output Power, Uplink: 27 dBm.
    Total Output Power, Downlink: 33 dBm.
    Maximum System gain: 95 dB.
    Gain Adjustment Range (GAR) @ 1dB step: 0-30 dB.
    Pass Band Ripple (p-p): ≤ 3 dB.
    Spurious emission: FCC Compliant.
    Intermodulation: -13 dBm.
    Uplink Noise Figure at Maximum Gain: ≤ 5 dB.
    System Delay: 17-37 sec.
    Max UL Input w/o Overdrive: -30 dBm.
    Max UL Input w/o Damage: -10 dBm.
    Input VSWR: ≤ 1.5.
    Impedance: 50 Ohm.
    Power Supply: -48V DC.
    Power Consumption (approx.): 100W.
    RF Connectors: N-Female, duplex.
    Fiber Connectors: SC/ APC.
    Operating Temperature: -40 to +55 oC.
    Operating Humidity: ≤ 95%.
    Ingress protection: NEMA 4X.
    Enclosure Cooling: Convection.
    MTBF: 100,000 @ 77 oF.
    Dimensions: Height 22.4", Length 15.4", Width 8.5".
    Weight without Bracket: 66 lbs.


    Warranty: Three Years.



    Per FCC laws and regulations, INDUSTRIAL GRADE distributed antennas system (Fiber DAS) master and/or remote units must not be installed by consumers. It is designed for installation by QUALIFIED INSTALLERS only. You MUST have an express consent in writing from all Carriers in your service area to operate this device. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation. Please submit public safety DAS installation service questionnaire for a quote if you require professional installation and assistance with consent and approval process.


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    Note: For any signal booster to help, outside signal strength must be at least -110 dB or there must be a clear line of sight to a cell tower that is within twenty miles. Before ordering, please check outside signal level in decibels or ensure that you can make and hold a phone call at any good spot outside where you can mount an exterior antenna. Square footage stated in signal booster listings is based on good signal outside. If it is any weaker, the boosted sq. ft. area will be considerably lower, accordingly.

    Kevin K. of Anderson, California gave the following review:

    Website is easy to use with plain straight forward info but could have had more on testing signal strength to make sure you get a strong enough booster.

    Therefore, please note that stated sq. ft. coverage is based on good signal outside. For best results: If outside signal is weak, we suggest choosing the next higher sq. ft. coverage kit. If outside signal is very weak, we suggest choosing the kit with even more higher sq. ft. range bracket. Basically, higher the sq. ft. bracket, the more powerful the signal amplifier with greater Gain as well as higher uplink and downlink output power.

    If outside signal is too weak (weaker than -110 dB), submit request for cell coverage solution assessment. Upon receipt of questionnaire, we will perform residential or business site survey. This will help us determine the system that is needed to improve cell coverage. Then, we will create system design using that system such as femtocell, active or hybrid distributed antenna system (DAS), or other carrier feed signal enhancing method available that will work at your signal-challenged location. Finally, we will schedule for installation after equipment and installation service quote has been approved by you, or your company.

    For non installation-included kits: Most home / office / building cell signal booster kits only include bracket to mount exterior antenna on outside wall, edge of roof, or existing pipe up to 2 inches in diameter. Mounting pole not included with most kits, unless stated specifically that it is included for free. Therefore, a mounting post must be purchased separately if you will require it to mount exterior antenna.

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