RFBIT - FIX GNSS Anti-Jam Module

The Price

A $10,000 antenna
on a $5,000 drone
was never a plan.

Anti-jam used to cost more than the aircraft it protected, so most aircraft flew without it.

What It Is

An antenna
that chooses
what it hears.

FIX takes the place of the GNSS antenna. It is a controlled reception pattern antenna (CRPA): it keeps receiving the satellites and cancels the directions jamming comes from, before the signal reaches the receiver.

Inside

Built in layers.
Working as one.

Under the radome sit four, eight or sixteen antenna elements, each with its own RF channel, and below them the processor that combines them into one antenna.

Adaptive Nulling

A blind spot
for every jammer.

FIX works out where the interference comes from and combines the elements so that direction goes deaf, while the satellites stay in view. Up to fifteen jammers at once, followed as they move.

Form Factor

Slim enough to fit.
Built to stay.

Array, RF chain and processor in one 23 mm unit under a flat radome, so it goes where the GNSS antenna was without changing the airframe. Sealed to IP66 and qualified to MIL-STD-810G.

The Price

From $999.
Not $10,000.

CRPA protection priced for every aircraft in the fleet, not only the few that could justify it.

The Question

Why is it this cheap?
It isn’t.

This is what a CRPA costs to build. There is no exotic part in a FIX — the silicon is the same class you will find in any anti-jam module built this decade. The difference is volume: anti-jam antennas were designed for programmes that buy a handful at a time, and priced to match. FIX was designed from the first drawing to be built by the thousand, for drone fleets rather than flagships, so the price falls as the order grows.

The Family

One design.
Three arrays.

Every FIX is the same 23 mm unit, with the same connectors, pinout and mounting. What changes is the array under the radome: four, eight or sixteen elements. Moving to a larger array is a change of part number, not a new integration.

Nulls

More elements.
More jammers.

Each element gives the processor one more way to steer a null. An array of N elements cancels up to N − 1 jammers at once: four elements suppress three, eight suppress seven, sixteen suppress fifteen jammers.

4 ElementsSuppress 3 Jammers

8 ElementsSuppress 7 Jammers

16 ElementsSuppress 15 Jammers

Two Builds

Two sizes.
One price.

Every FIX model comes in two builds, at the same price. Compact is smaller and lighter, for airframes with little room to spare. Performance spaces its antenna elements further apart, which gives it better jammer suppression.

CompactFIX-8-C

>40 dB jammer suppression

PerformanceFIX-8-P

>50 dB jammer suppression

Band Diversity

Jam L1.
We still have L2/L5.

Most jammers target L1; far fewer cover L2, and fewer still L5. FIX 8D2 and 8D5 keep the same eight elements as FIX 8, in almost the same size, but split them between L1 and L2 or L5. When L1 is jammed, the fix keeps coming from the band the jammer missed.

FIX 88 L1 elements

FIX 8 with the radome removed: 8 L1 elements

Suppress 7 L1 jammers

FIX 8D24 L1 + 4 L2 elements

FIX 8D2 with the radome removed: 4 L1 + 4 L2 elements

Suppress 3 L1 + 3 L2 jammers

FIX 8D54 L1 + 4 L5 elements

FIX 8D5 with the radome removed: 4 L1 + 4 L5 elements

Suppress 3 L1 + 3 L5 jammers

L1 elementL2 elementL5 element

Software Capabilities

It shows
its work.

Every FIX serves a browser GUI on its Ethernet port. Nothing to install: open the IP address, and the product shows you what it sees, and what it is doing about it.

Virtual Antenna Pattern

FIX shows in real time where each jammer is coming from and where the antenna has placed its nulls, and the user can read this data out of the unit whenever it is needed.

Spectrum & Jammer Information

The spectrum is shown live, with a waterfall below it. Every jammer found in it is listed with its type, centre frequency, bandwidth, level, direction and the response FIX has chosen for it. Both the spectrum and the jammer list can be sent to the user as data.

Adaptive Notch Filters

FIX watches the spectrum, and when a jammer appears it places a notch filter over the frequencies the jammer occupies, adjusting the depth as the jammer changes. When the jammer is gone, the filter is lifted. The screen shows the spectrum before and after the filter, with the notch depth and frequency range. The filter data can be sent to the user as well.

Spoofing Detection

FIX runs spoofing detection algorithms developed specifically for it. With them, the fake satellites are picked out as soon as an attack starts: they turn red on the sky plot, the direction they come from is marked, and FIX leaves them out of the position solution and keeps working with the real satellites. Each detection can also be sent to the user.

Integrated GNSS Receiver

Every FIX carries its own u-blox GNSS receiver: the MAX-M10 in single-band models, the ZED-F9P with RTK in dual-band models. Each satellite it tracks is shown on the sky plot and the world map with its signal strength, grouped by constellation, and this satellite data can also be sent to the user.

Onboard Sensors

FIX carries a 3-axis accelerometer, a 3-axis gyroscope and a 3-axis magnetometer (together a 9-axis IMU), a barometer, a humidity sensor and a board temperature sensor. Their readings are shown live, so the unit’s condition can be checked from the ground. They are also logged together with every jamming and spoofing event, each time-stamped, so after a flight you can see when a jammer appeared and from which direction.

Autopilot Integration

FIX can be the drone’s GPS and compass module in one unit, doing the job of the separate module that usually sits on the mast. It connects to the autopilot over DroneCAN, or sends position, velocity and time as MAVLink, NMEA or UBX, always with the jamming and spoofing status, so ArduPilot and PX4 can use it directly. The cleaned RF signal is also available on an SMA connector for an external receiver.

DroneCAN

Cleaned RF out over SMA

Smart Diagnostics

Status at
a Glance.

An RGB LED on the bottom of the unit shows the user the anti-jam status without a laptop: whether it is starting up, holding a fix, nulling a jammer, or reporting a warning or a fault. It can also be switched off when no light is allowed.

Input power is present and the unit is booting. The LED holds white through power-up until the anti-jam self-test completes.

Interfaces & Connectivity

One connector.
Everything on it.

One 15-pin Micro-D carries power, data and control on every model, and FIX can be controlled over any of its ports. It takes 9 to 36 VDC straight from the platform, and the cleaned GNSS signal leaves on its own SMA.

1x

Fast Ethernet

WebGUI, data streaming and control

1x

RS-232

Data streaming and control

1x

RS-422

Data streaming and control

1x

CAN

DroneCAN, MAVLink, data streaming and control

Drop-in

Mount FIX where your GNSS antenna was and connect the receiver’s antenna cable to its SMA. The receiver you already use gets the cleaned signal, and apart from powering FIX, nothing in your autopilot setup changes.

Standalone

Use the receiver inside. Position, velocity and time come out as NMEA, UBX, MAVLink or DroneCAN over the 15-pin Micro-D, with jamming and spoofing status and the bearing of each jammer, for the flight controller to act on.

Environmental Qualification

Sealed and
qualified.

Every FIX is sealed to IP66, type-qualified to MIL-STD-810G across seven environmental categories, and to MIL-STD-461F for electromagnetic compatibility. Not simulated. Not estimated. Tested and verified against the standard.

✓ Ingress Protection IP66 Dust-tight, protected against water jets

✓ Operating Temperature −40 to +85°C 810G 501.5 Proc II · 502.5 Proc II

✓ Storage Temperature −40 to +85°C 810G 501.5 Proc I · 502.5 Proc I

✓ Altitude Qualification 40,000 ft 810G 500.5 Proc I & II

✓ Humidity 95% RH 810G 507.5 Proc II

✓ Acceleration 810G 513.6 Proc I & II

✓ Vibration 810G 514.6D-2 Proc I · 514.8D-1 Proc I

✓ Mechanical Shock 810G 516.6 Proc I & II

✓ Electromagnetic Compatibility MIL-STD-461F CE102 · CS114 · CS115 · CS116 · RE102 · RS103

Complete Chain

One supplier.
Built for jammed skies.

An aircraft flying through jamming needs three things to keep working: its own position, a ground antenna that stays on it, and a data link that gets through. RFBIT makes all three, so they are built to work together and come from a single supplier.

GNSS Anti-Jamming

FIX

Keeps the aircraft’s position and time when GNSS is jammed or spoofed, so it can still navigate, fly its route and find its way home. It takes the place of the GNSS antenna, so the rest of the aircraft stays as it is.

You are here

RF Antenna Tracker

TRACER

Keeps the ground antenna pointed at the aircraft by following its radio signal, not its reported GPS position, so the link holds even when the aircraft’s GNSS is jammed.

Explore TRACER →

MIMO Mesh Data Link

Bridge

The data link itself, designed to keep the aircraft and the ground station in contact and to carry command, telemetry and video even in jammed environments.

Explore Bridge →

ITAR-free

Designed and manufactured in Türkiye, and ITAR-free. Nobody in the supply chain can stop your programme for reasons that have nothing to do with it.

Ships in 8–12 Weeks

All seven FIX models ship 8–12 weeks from order, in either build. Nothing to install on arrival: the WebGUI runs on the unit.

1	2	3	4	5	6	7	8
ETH TX+	ETH TX−	ETH RX+	ETH RX−	422 TX+	422 TX−	422 RX+	422 RX−

9	10	11	12	13	14	15
CAN H	CAN L	232 TX	232 RX	DGND	PWR IN−	PWR IN+

Part Number	Description
FIX-ACC-CBL-15D	15-Pin Micro-D Interface Cable, 1 m (extra)
FIX-ACC-RF-SMA	SMA Male to SMA Male RF Cable, 0.5 m (extra)

Part Number	Model	Build	Eval Kit	10+	100+	1,000+
FIX-4-C	FIX 4	Compact	$2,199	$1,649	$1,349	$999
FIX-4-P	FIX 4	Performance	$2,199	$1,649	$1,349	$999
FIX-8-C	FIX 8	Compact	$2,699	quoted	quoted	quoted
FIX-8-P	FIX 8	Performance	$2,699	quoted	quoted	quoted
FIX-8D2-C	FIX 8D2	Compact	$2,799	quoted	quoted	quoted
FIX-8D2-P	FIX 8D2	Performance	$2,799	quoted	quoted	quoted
FIX-8D5-C	FIX 8D5	Compact	$2,799	quoted	quoted	quoted
FIX-8D5-P	FIX 8D5	Performance	$2,799	quoted	quoted	quoted
FIX-16-C	FIX 16	Compact	$6,999	quoted	quoted	quoted
FIX-16-P	FIX 16	Performance	$6,999	quoted	quoted	quoted
FIX-16D2-C	FIX 16D2	Compact	$7,099	quoted	quoted	quoted
FIX-16D2-P	FIX 16D2	Performance	$7,099	quoted	quoted	quoted
FIX-16D5-C	FIX 16D5	Compact	$7,099	quoted	quoted	quoted
FIX-16D5-P	FIX 16D5	Performance	$7,099	quoted	quoted	quoted

Compare Versions

Fourteen versions, side by side.

Parameter	FIX‑4‑CCompact	FIX‑4‑PPerformance	FIX‑8‑CCompact	FIX‑8‑PPerformance	FIX‑8D2‑CCompact	FIX‑8D2‑PPerformance	FIX‑8D5‑CCompact	FIX‑8D5‑PPerformance	FIX‑16‑CCompact	FIX‑16‑PPerformance	FIX‑16D2‑CCompact	FIX‑16D2‑PPerformance	FIX‑16D5‑CCompact	FIX‑16D5‑PPerformance
Channels	4	4	8	8	8	8	8	8	16	16	16	16	16	16
Elements	4 on L1	4 on L1	8 on L1	8 on L1	4 on L1 4 on L2	4 on L1 4 on L2	4 on L1 4 on L5	4 on L1 4 on L5	16 on L1	16 on L1	8 on L1 8 on L2	8 on L1 8 on L2	8 on L1 8 on L5	8 on L1 8 on L5
Nulls	3	3	7	7	3 on L1 3 on L2	3 on L1 3 on L2	3 on L1 3 on L5	3 on L1 3 on L5	15	15	7 on L1 7 on L2	7 on L1 7 on L2	7 on L1 7 on L5	7 on L1 7 on L5
Bands	L1	L1	L1	L1	L1 + L2	L1 + L2	L1 + L5	L1 + L5	L1	L1	L1 + L2	L1 + L2	L1 + L5	L1 + L5
Dimensions (mm)	80 × 80 × 23	100 × 100 × 23	115 × 115 × 23	145 × 145 × 23	110 × 110 × 23	135 × 135 × 23	115 × 115 × 23	140 × 140 × 23	155 × 155 × 23	195 × 195 × 23	155 × 155 × 23	195 × 195 × 23	160 × 160 × 23	200 × 200 × 23
Weight	120 g	150 g	185 g	265 g	175 g	235 g	185 g	250 g	295 g	420 g	295 g	420 g	300 g	435 g
Power Consumption	<6 W	<6 W	<12 W	<12 W	<12 W	<12 W	<12 W	<12 W	<25 W	<25 W	<25 W	<25 W	<25 W	<25 W
Evaluation Kit	$2,199	$2,199	$2,699	$2,699	$2,799	$2,799	$2,799	$2,799	$6,999	$6,999	$7,099	$7,099	$7,099	$7,099
10+ Units	$1,649	$1,649	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted
100+ Units	$1,349	$1,349	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted
1,000+ Units	$999	$999	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted	quoted

Per-unit prices in USD. Compact and Performance share the same price. Everything not listed is identical across the range — 23 mm thick, the same M3 mounting scheme, the same SMA and Micro-D connectors. One integration, seven arrays.

FIXGNSS Anti-Jam Modules

A $10,000 antennaon a $5,000 dronewas never a plan.

An antennathat chooseswhat it hears.

Built in layers.Working as one.

A blind spotfor every jammer.

Slim enough to fit.Built to stay.

From $999.Not $10,000.

Why is it this cheap?It isn’t.

One design.Three arrays.

More elements.More jammers.

Two sizes.One price.

Jam L1.We still have L2/L5.

It showsits work.

Virtual Antenna Pattern

Spectrum & Jammer Information

Adaptive Notch Filters

Spoofing Detection

Integrated GNSS Receiver

Onboard Sensors

Autopilot Integration

Status ata Glance.

One connector.Everything on it.

Fast Ethernet

RS-232

RS-422

CAN

Drop-in

Standalone

Sealed andqualified.

One supplier.Built for jammed skies.

FIX

TRACER

Bridge

ITAR-free

Ships in 8–12 Weeks

Choose Your Configuration

FIX-4-C

FIX-4-P

FIX-8-C

FIX-8-P

FIX-8D2-C

FIX-8D2-P

FIX-8D5-C

FIX-8D5-P

FIX-16-C

FIX-16-P

FIX-16D2-C

FIX-16D2-P

FIX-16D5-C

FIX-16D5-P

Specifications — FIX-8-P

Accessories

Ordering Information

FIX 4 OEM