SureCall Guardian3 QR 80 dB Public Safety Band Bi-Directional Amplifer SC-TriPSBS-80-QR: Open (Display)

SureCall Guardian3 QR 80 dB Public Safety Band Bi-Directional Amplifer SC-TriPSBS-80-QR

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  • Public safety signal booster for large buildings
  • FirstNet Ready
  • 700, 800, and 900 MHz tri-band booster
  • +80 dB gain
  • NEMA-4 enclosure
  • Remote monitoring and battery backup capabilities


Free lifetime support

Product Description

This product has been discontinued and replaced by the SureCall Guardian4.

Features of the SureCall Guardian3 QR

  • Provides improved coverage for 700 MHz (FirstNet), 800 MHz, and 900 MHz (SMR) public safety frequencies.
  • +80 dB gain with automatic gain control (AGC).
  • Ethernet port for SureCall Sentry™ remote monitoring.
  • 7-pin alarm and UPS port for external battery backup.
  • NEMA-4 rated housing.
  • Meets NFPA 1221 and IFC 510 codes.
  • Energy-saving operation—bands remain dormant when not in use.
  • A/C 110V or DC 16-24V power.
  • Uplink and downlink attenuation independently adjustable in −1 dB increments.
  • 3-year warranty.

The SureCall Guardian3™ QR (Quick Response) public safety signal booster amplifies FirstNet signals for first-responder and emergency services radios, providing consistent signal for public safety officials who are counting on reliable communication inside large buildings. The Guardian3 QR’s tri-band booster has a maximum gain of +80 dB on the 700 MHz (FirstNet Ready), 800 MHz, and 900 MHz SMR (Specialized Mobile Radio Service) public safety frequencies.

Building codes require most newly-constructed large buildings, as well as existing large buildings that undergo expansion, to have signal strength of −95 dBm or better in critical areas like elevators and stairwells. The Guardian3 QR provides improved signal for those areas, and meets National Fire Protection Association (NFPA) and International Fire Code (IFC) requirements.

The Guardian3 QR features a NEMA-4 rated amplifier housing to protect against hose-directed water. It also comes equipped with dry contact 7-pin alarming capability and UPS and Ethernet port-enabled remote monitoring.

Plenum air coax cable

Public safety systems require fire-rated cable in plenum spaces. Plenum cable fully meets state and federal building codes.

Powerful Signal recommends ½-inch plenum air coax. Half-inch cable has nearly half the signal loss per foot of cable compared to 400-type coax cable, delivering stronger signal from the SureCall amplifier to emergency responders’ communications devices.

(Plenum air cable is available at additional cost. Call Powerful Signal at 866-912-3444 for details.)

Plenum air coax cable terminated with an N-male connector Fire-rated plenum air coax cable from Powerful Signal.

Best practices: a custom-designed SureCall Guardian3 QR solution

In a large building, office, or warehouse, you’ll get the best results and performance from a SureCall Guardian3 QR with a custom design and professional installation.

Working with your floor plans, Powerful Signal’s design engineers will create design specifications that will allow you to use the fewest number of components to get the maximum amount of signal coverage inside your building.

Powerful Signal’s professional installer will have knowledge of local building codes and the proper tools and experience to make sure your system is set up and configured correctly.

Call Powerful Signal at 866-912-3444 or request a free custom quote online. We can design a custom public safety communications system at the best possible price point. We’ve designed thousands of signal amplifier systems; let us create one for you!

Office floor with a SureCall public safety BDA and dome antenna An office floor flooded with signal from a SureCall public safety BDA and one dome antenna.

Purchasing a SureCall Guardian3 QR system

Properly installing and configuring a SureCall Guardian3 QR is complex task, so we strongly advise a custom solution (see above). If you prefer to purchase this system as a standalone product, without design and installation, the kit comes with the following components:

SureCall Guardian3 QR SC-TriPSBS-80-QR icon SureCall Guardian3 QR public safety BDA with NEMA‑4 enclosure

Operates on major public safety frequencies

The SureCall Guardian3 QR operates on FirstNet and other frequencies used by first responders:

  • 700 MHz (FirstNet): 788–805 MHz uplink / 758–775 MHz downlink.
  • 800 MHz: 806–824 MHz uplink / 851–869 MHz downlink.
  • 900 MHz (SMR): 896–901 MHz uplink / 935–940 MHz.
FirstNet logo

Warranty returns

The SureCall Guardian3 QR may only be returned due to defects or problems that are solely the fault of SureCall.

For more information on warranty returns, see our SureCall warranty information page.

FCC Notice

Product Specifications

Public safety
Outside Antenna:
(sold separately)
Inside Antenna:
(sold separately)
Cable Type:
400 or plenum air (sold separately)
Connector Type:
N / RS-232 / Ethernet / USB
50 Ω
+80 dB max
Gain Adjustment:
31 dB
Uplink Frequencies:
788–805 / 806–824 / 896–901 MHz (including D Block)
Downlink Frequencies:
758–775 / 851–869 / 935–940 MHz (including D Block)
Booster Case Material:
Metal (NEMA-4)
Signal Readout:
LED light

Warranty Information

For warranty information on this product, please see our SureCall warranty information page.

Questions & Answers

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