LNFA1X4
GPS Amplified 1X4 Splitter Technical Product DataFeatures•••••••Low NoiseAmplified Unity Gain 0dB typical
L1 GPS Filtered
Extremely Flat Group Delayo Less than 1ns variation
High Isolation Standard
DC Blocked Outputs Feature 200Ω Loads
Excellent Gain Flatness

Description
This Low Noise Filtered Amplified 1X4 (LNFA1X4) splitter is a one input, four output device with 0dB
nominal gain. The device features a low noise input section to establish an overall system noisefigure. Excellent port-to-port isolation and unity gain are achieved by padded outputs. The device
features excellent frequency selectivity around the L1 band to prevent interference from other highpower radio frequency sources, such as cellular transmitter stations. The LNFA1X4 device will power
itself and an external GPS antenna from a 5.0 VDC source connected on any of the RF Outputs. A“pick and choose” circuit is used to select only one DC input for power in the event that more than
one 5v source is connected. The remaining DC inputs are switched to a 200Ω resistor to simulateantenna current draw.

Use Cases• Utilized in thousands of cell-sites nationally.
• Splitting and amplifying a roof antenna signal between 4 GPS/GLONASS/GNSS receivers.
• Splitting and amplifying WAAS antenna between WASS receiver, ADS-B, and 2 other devices.
• Usable as a small part of a larger signal distribution network.

Rev A

For sales or technical support contact us at 1-800-463-3063 or salestech@gpsnetworking.com

1

LNFA1X4
Electrical Specifications, TA=25C
General Specification
Parameter

Notes

Min

Frequency RangeCovers all major GNSS constellations.

1.1

Characteristic
Impedance

Unused ports should be terminated with 50Ω loads.

Req. DC Input V.

Operating Voltage Range.

Current Draw

Typical current consumption.

TypMaxUnit

1.7GHzΩ

50
3.3

67

VDCmA

GPS L1 RF Specification
Parameter

Notes

Min

Typ-1.50Max

Unit

Gain

The relative increase in signal power provided by the amplifier.

1.5dB

Input SWR

Input Standing Wave Ratio: S11.

2.0:1

-

Output SWR

Output Standing Wave Ratio: S22.

2.0:1

-

Filter Bandwidth

The 3dB bandwidth of the L1 filter.

30MHzRejection

Rejection at L1 ± 60 MHz.

-60dB

L1 Noise Figure

The increase in noise power relative to an ideal amplifier.

4.75

dB

Amplitude Balance

The difference in gain or loss between each output port.

Phase Balance

The difference in phase variation between each output port.

6Isolation

The amount of attenuation between two output ports.

50

Input P1dB

The 1dB compression point.

-31.5

Connector Options

Rev A

1.0

Connector Style
Type N-female

ChargeNo Charge

Type SMA-female

No Charge

Type TNC-female

No Chargedeg>61

Type BNC-female

No Charge

OtherContact GPS Networking

For sales or technical support contact us at 1-800-463-3063 or salestech@gpsnetworking.com

dBdBdBm

2

LNFA1X4
Part Number Configuration

Rev A

For sales or technical support contact us at 1-800-463-3063 or salestech@gpsnetworking.com

3

LNFA1X4Performance
LNFA1X4 (Standard Gain, typical)
Each LNFA1X4 ships with a test sheet that verifies critical performance characteristics, such as gain,input VSWR, and amplitude balance; a typical VNA test sheet is shown below.

Rev A

For sales or technical support contact us at 1-800-463-3063 or salestech@gpsnetworking.com

4MechanicalContact us at salestech@gpsnetworking.com for 3D models or CAD drawings.