GNSS LNA with Output Bias Tee – GPS L1-L5, GLONASS, BeiDou, NAVIC, 25 dB Gain

Regular price $99.00

PRODUCT OVERVIEW

GNSS signals arrive at the antenna extremely weak, and a long cable run between an outdoor antenna and an indoor receiver costs you signal before it ever reaches your equipment. This amplifier solves both problems in one part: it boosts the GNSS signal with 25 dB of gain and a 1 dB noise figure, and its integrated bias tee sends DC power down the same coax, so you don't need a separate power cable running to your antenna.

It covers GPS L1 through L5, BeiDou, GLONASS, and NAVIC, with filtering built into the amplifier itself for excellent rejection of nearby cellular, LTE, and ISM band interference. Operating range is -40°C to +85°C, suitable for outdoor, antenna-mounted installation.

Power it one of three ways: a Micro-USB cable, +5VDC to +12VDC on the DC header, or the integrated bias tee itself (+5VDC to +12VDC). If your setup already runs power to the antenna over the same coax, the bias tee is almost always the simplest choice, since it eliminates the separate power cable entirely. Use the DC header or Micro-USB instead if you're powering this unit in isolation, on a bench, or somewhere a coax-based power path doesn't fit your setup.

This LNA draws 100 mA at 3.3V or higher, more than most GNSS receivers can supply through their own antenna bias pin, which typically provides only 5 to 20 mA. An underpowered LNA won't fail outright, it will current-limit quietly and never reach its rated gain or noise figure. GPIO Labs' GNSS Filtered Bias Tee solves this by injecting power independently of your receiver while filtering nearby interference on the same line.

⚠️ Important: Because the bias tee is installed, powering this unit via the DC header or USB connector will put +5VDC on the RF output. If your receiver doesn't have a DC blocking capacitor or other voltage protection on its input, this will damage your receiver. Confirm your receiver's input protection before connecting power.

Need the same amplifier without integrated power injection? See the standard GNSS LNA.

Standout Spec: NF < 1 dB, OIP3 +28.8 dBm, under $100 — specs that typically cost $700+ from other vendors.

APPLICATIONS

GNSS reception in weak-signal environments where cable loss between antenna and receiver is a concern
Rooftop, mast, or vehicle-mounted antenna installs where running a separate power cable alongside the coax isn't practical
Rejecting strong nearby cellular, LTE, UHF, 915 MHz, and 2.4 GHz ISM interference before it reaches your receiver
Multi-constellation GNSS receivers needing simultaneous GPS, GLONASS, BeiDou, and NAVIC coverage from a single front end

SPECIFICATIONS

Passband

1100 MHz - 1700 MHz

Frequency ........... Gain

100 MHz ......... -2 dB

200 MHz ......... 3 dB

500 MHz ......... 10 dB

900 MHz ......... -2 dB

1000 MHz ......... -2 dB

1100 MHz ......... 30 dB

1200 MHz ......... 28 dB

1300 MHz ......... 26 dB

1400 MHz ......... 25 dB

1500 MHz ......... 25 dB

1600 MHz ......... 24 dB

1700 MHz ......... 24 dB

1800 MHz ......... 18 dB

1900 MHz ......... 6 dB

2000 MHz ......... -10 dB

2400 MHz ......... -5 dB

3000 MHz ......... -10 dB

NOTES

The filter uses SMA-F connectors.

This item can be powered using DC on the RF cable.

Max RF Input = -15 dBm

BANDS COVERED

GPS (USA)

Frequency	Name	Use
1575.42 MHz	L1	Civil (C/A code), military (P(Y) code)
1227.60 MHz	L2	Military P(Y), civilian L2C
1381.05 MHz	L3	Nuclear detonation detection
1379.91 MHz	L4	Experimental ionospheric research
1176.45 MHz	L5	Safety-of-life, high accuracy civil

GLONASS (Russia)

Band	Frequency Range	Use
1598.0625–1605.375 MHz	L1 (G1)	Civil standard
1242.9375–1248.625 MHz	L2 (G2)	Civil/military
1202.025 MHz	L3 (G3)	CDMA, interoperability with GPS L5

Galileo (EU)

Frequency	Name	Use
1575.42 MHz	E1	Open service, shared with GPS L1
1191.795 MHz	E5	Broadband, highest accuracy civil signal
1176.45 MHz	E5a	Open service, interoperable with GPS L5
1207.14 MHz	E5b	Open service, high integrity
1278.75 MHz	E6	Commercial/authenticated service (HAS)

BeiDou (China)

Frequency	Name	Use
1561.098 MHz	B1I	Legacy open service (BDS-2)
1575.42 MHz	B1C	Modern open service (BDS-3), interop with GPS L1/Galileo E1
1176.45 MHz	B2a	Open service (BDS-3), interop with GPS L5/Galileo E5a
1207.14 MHz	B2b	Open service (BDS-3), PPP service
1191.795 MHz	B2 (B2a+B2b)	Wideband, same center as Galileo E5
1268.52 MHz	B3I	Authorized service

NavIC (India)

Frequency	Name	Use
1176.45 MHz	L5	Standard positioning service

QZSS (Japan)

Frequency	Name	Use
1575.42 MHz	L1	Interoperable with GPS L1
1227.60 MHz	L2	Interoperable with GPS L2
1176.45 MHz	L5	Interoperable with GPS L5
1278.75 MHz	L6 (LEX)	Centimeter-level augmentation (CLAS service)