- What Is and Isn't Published About the LAS Passing Score
- The Gates You Clear Before the Knowledge Exam
- Why the Competency Standard Matters More Than a Number
- The Eleven Domains and Where Candidates Lose Points
- The Calculation Skills You Cannot Skip
- FDR Interpretation: The Practical Core
- Standalone vs. Journeyman CET Route
- A Domain-Ordered Prep Plan
- Frequently Asked Questions
- ETA International governs Line and Antenna Sweeping, and its published competency requirements list eleven knowledge categories with no percentage weights.
- Knowledge-exam question count, duration and passing score are not verified here; confirm them through ETA's official materials.
- An ETA-approved course, fee and hands-on exam come before the knowledge exam, so the hands-on portion is part of your path to certification.
- Because no domain weights are published, study all eleven domains rather than gambling on a favorite few.
What Is and Isn't Published About the LAS Passing Score
If you searched for "LAS passing score 2026" hoping for a single clean percentage, here is the honest answer: the specific passing score for the Line and Antenna Sweeping knowledge exam is not something this article can state as verified fact. The same applies to the number of questions and the exam duration. Rather than invent a figure that might send you into the exam with the wrong expectations, this guide lays out what is documented, what the exam is built to measure, and how to prepare so that the exact cut score stops being the thing you worry about.
What is documented is the structure behind the credential. ETA International issues the Line and Antenna Sweep (LAS) Competency Requirements, which identify eleven knowledge categories. The official source is the competency document at https://etai.org/comps/LAS_comps.pdf, and that document, along with ETA's current candidate materials, is where you should confirm exam logistics before test day.
For a broader look at how candidates perceive difficulty, see our guide on how hard the LAS exam is, and for outcome data, what the LAS pass rate data shows.
The Gates You Clear Before the Knowledge Exam
The passing score is only one checkpoint. The path to LAS involves several steps, and understanding the order helps you budget time and money correctly:
- ETA-approved course. Training comes first. This is where you handle FDR-capable equipment under instruction.
- Fee. A fee is part of the process. For the amounts, see our LAS certification cost breakdown rather than relying on a figure quoted out of context.
- Hands-on exam. A practical assessment precedes the knowledge exam. Your ability to operate the equipment and produce a valid sweep is evaluated separately from your written knowledge.
- Knowledge exam. The written test covering the competency categories described below.
This sequence matters for how you think about "passing." Many candidates fixate on the knowledge exam score, but the hands-on component tests whether you can actually calibrate an instrument, select the right settings and capture a trace. Skills you build for one reinforce the other. If you are still working out eligibility, read LAS requirements and how to qualify and the overview in LAS training.
Why the Competency Standard Matters More Than a Number
A competency-based credential is designed around demonstrated ability to do the work, not around beating a curve. The LAS Competency Requirements describe what a technician must know to commission an antenna system properly: how the feedline behaves, how reflections arise, how to sweep the system with the right instrument, and how to read what the instrument shows.
That has a practical consequence for your preparation. Because ETA does not publish percentage weights for the eleven categories, you cannot safely assume any domain is "light." A candidate who skips a topic because it seems minor is making an unverified bet. The safer strategy is to build competence across the whole standard, which is also what a hiring employer wants to see.
Key Takeaway
Do not optimize for a guessed cut score. Optimize for being able to explain every one of the eleven categories and perform the core calculations without a reference sheet. That readiness clears almost any reasonable passing threshold.
The Eleven Domains and Where Candidates Lose Points
The competency requirements break into eleven areas. Below is a LAS-specific view of each, with the concepts that tend to separate prepared candidates from underprepared ones. For a deeper walkthrough, see the complete guide to all 11 LAS content areas.
Domain 1: Introduction to Antenna System Commissioning
The purpose and benefits of commissioning, and the methods available to do it.
- Compare TDR and FDR approaches.
- Understand the role and limits of a stand-alone VNA. A VNA alone is not the full-sweep verification method described in the syllabus; full commissioning sweeps use FDR-capable LMR equipment.
- Safe equipment use, system diagrams, common components and commissioning records.
Domain 2: Radio Frequency (RF) Fundamentals
The physics behind everything you will measure.
- Maximum power transfer and what happens under impedance mismatch.
- Reflections, reflection coefficient, and how VSWR, standing waves and return loss relate to one another.
- Attenuation and insertion loss, plus wave propagation and components of commercial and private radio systems.
Domain 3: Radio Frequency (RF) Mathematics
Decibel fluency under time pressure.
- Absolute values and power-ratio decibels.
- The dBm, dBc, dBd and dBi references, including the 2.15 dB dipole/isotropic difference.
- Converting power and voltage ratios to dB, adding and subtracting dB, and instrument-assisted calculations.
Domain 4: Coaxial Cable Fundamentals
How the feedline itself shapes measurements.
- Construction and characteristic impedance, including common 50-ohm systems.
- Skin effect and equivalent capacitance, inductance and resistance.
- Velocity factor in FDR measurements and tuned stubs, and how cable dimensions and frequency affect loss and impedance.
Domain 5: Coaxial Cable (RF Transmission Line/Feedline) Installation
Installation quality that determines whether a sweep is clean or confusing.
- Hangers, mounting and spacing; grounding requirements and kits; weatherproofing of connectors and ground kits.
- Bend-radius requirements and the fault signatures that violations produce.
- Lightning-protection components and how they appear in FDR traces.
Domain 6: RF Connectors and Connectorization
Where a surprising number of real-world faults originate.
- Appropriate connector types and specifications.
- Installation tools, cable preparation, torque requirements and common errors.
- Passive intermodulation and its effects.
Domain 7: Antennas and Antenna Theory
The largest conceptual domain, covering how antennas are specified and how they radiate.
- Fields, waves and polarization; bandwidth, match, gain, beamwidth and tilt.
- Dipole, isotropic, omnidirectional, directional and quarter-wave examples; wavelength calculations.
- Radiation patterns and coverage, effective radiated power including gains and losses, FDR bandwidth measurement, mechanical versus electrical tilt, and mounting effects.
Domain 8: Frequency Domain Reflectometer (FDR) Testing
How the measurements are actually made.
- Adapters, calibration standards and their care; open-short-load calibration and recalibration triggers.
- Phase-stable cables; DTF cable type, data points, frequency-related maximum distance and resolution.
- Antenna return loss and bandwidth; insertion loss versus return loss; full-system match and DTF tests.
Domain 9: FDR Test Interpretation
Turning traces into conclusions.
- Compare measured return loss to manufacturer specifications for antennas, feedlines, connectors and lightning suppressors.
- Estimate expected system return loss using software and functional understanding.
- Map measured distances to diagrams, components, faults and likely causes.
Domain 10: FDR Operation
Instrument handling and record keeping.
- Calibration; select the frequency range first; markers and limit lines and their authority.
- Test mode, amplitude and autoscale, distance range, DTF cable selection, windowing and smoothing.
- Saving, recalling and naming traces; instrument date and time; software tools; sweep records and as-built diagrams.
Domain 11: FDR Troubleshooting
Applying everything to find and fix problems.
- Common antenna, cable and connector faults.
- Comparing baseline and current traces.
- Choosing appropriate troubleshooting steps and corrective actions.
The Calculation Skills You Cannot Skip
No percentage weights are published, but the mathematics domain is one where preparation visibly pays off, because the work is mechanical once you have practiced it. Be comfortable with the following without hunting for a formula sheet:
- Converting a power ratio to decibels and back again.
- Converting a voltage ratio to decibels, and remembering that it differs from the power-ratio conversion.
- Adding and subtracting decibel values through a chain of gains and losses.
- Translating between the dBd and dBi references using the 2.15 dB difference between a dipole and an isotropic radiator.
- Relating return loss, reflection coefficient and VSWR, since these describe the same underlying mismatch in different forms.
Our LAS cheat sheet collects the key relationships in one place for quick review, and the LAS practice tests let you drill decibel problems repeatedly until the conversions feel routine.
FDR Interpretation: The Practical Core
Domains 8 through 11 form the heart of what makes Line and Antenna Sweeping distinct from general RF knowledge. Four of the eleven categories center on the FDR instrument, which tells you where the credential's emphasis lies. Understand these ideas well:
Calibration and setup come first
A trace is only as trustworthy as the calibration beneath it. Know the open-short-load procedure, why calibration standards and adapters need care, and what conditions force a recalibration. Know too that you select the frequency range first, because that choice drives the maximum distance and resolution you can achieve for a given number of data points.
Reading distance-to-fault
DTF traces map reflections to physical locations along the line. The skill being tested is connecting a feature at a measured distance to a real component in the system diagram: a connector, a lightning suppressor, a jumper transition, or a fault. Cable type and velocity factor must be set correctly, or the distances will be wrong.
Return loss versus insertion loss
These are different measurements that answer different questions. Return loss describes how much signal reflects back from a mismatch; insertion loss describes how much signal is lost passing through a component or the whole feedline. Candidates who blur the two struggle with interpretation questions.
Baselines for troubleshooting
A saved baseline trace turns a mysterious problem into a comparison. Good record keeping, including trace naming, correct instrument date and time, and as-built diagrams, is explicitly part of the standard, not an afterthought.
| Concept | What It Tells You | Where It Shows Up |
|---|---|---|
| Return loss | How much energy reflects from a mismatch | Antenna and component match; Domains 2, 8, 9 |
| Insertion loss | Energy lost passing through a component or line | Feedline and component attenuation; Domains 2, 8 |
| DTF | Distance to each reflection along the line | Locating faults and components; Domains 8, 9, 11 |
| Baseline trace | Known-good reference for later comparison | Troubleshooting and records; Domains 10, 11 |
Standalone vs. Journeyman CET Route
ETA offers LAS as a standalone certification and also in connection with the journeyman CET route. The two are distinct. The journeyman CET route additionally requires CETa or General Communications Technician Level 1, while the standalone route does not carry that prerequisite. Which path you take affects your eligibility steps and your overall certification plan more than it changes the technical content you need to learn.
Prior familiarity with RF, LMR, cellular or amateur radio, along with antenna and feedline knowledge, is recommended for either route. It is not a substitute for the approved course, but it shortens the learning curve considerably. If you are weighing whether the investment makes sense for your career, see whether the LAS certification is worth it, and for the employment side, LAS jobs and the LAS salary guide.
A Domain-Ordered Prep Plan
Because the standard builds from physics to instrument operation, the best study order follows the same dependency chain. Math and RF theory support cable and antenna concepts, which in turn make FDR traces interpretable. A sample sequencing:
Foundations
- Commissioning methods and the TDR/FDR/VNA distinction (Domain 1).
- Reflection, VSWR, return loss and insertion loss relationships (Domain 2).
- Daily decibel drills, including dBd/dBi conversions (Domain 3).
Cable, Installation and Connectors
- Characteristic impedance, skin effect and velocity factor (Domain 4).
- Grounding, weatherproofing, bend radius and lightning protection (Domain 5).
- Connector types, torque, preparation errors and passive intermodulation (Domain 6).
Antennas
- Gain, beamwidth, tilt, polarization and radiation patterns (Domain 7).
- Wavelength and effective radiated power calculations.
FDR Testing, Operation and Interpretation
- Calibration, frequency range selection, markers, limit lines and DTF settings (Domains 8 and 10).
- Mapping trace features to components and faults (Domain 9).
Troubleshooting and Full Review
- Baseline versus current trace comparisons (Domain 11).
- Timed mixed-domain practice and review of weak areas.
Adjust the pace to your background; someone already working in LMR may compress the early weeks, while a newcomer may stretch them. For a fuller plan, read our LAS study guide, and consider building recall with the LAS practice test questions once you finish each domain block.
Frequently Asked Questions
The passing score is not verified here, and neither are the question count or exam duration. Confirm all three directly with ETA International's current candidate materials. This article deliberately avoids guessing a number.
No. The competency requirements identify eleven knowledge categories without published percentage weights. That is why broad preparation across all categories is safer than concentrating on a few.
No. The syllabus describes full commissioning sweeps using FDR-capable LMR equipment, and a stand-alone VNA alone is not the full-sweep verification method it describes. The role and limits of a VNA are themselves part of the introductory material.
An ETA-approved course, a fee and a hands-on exam precede the knowledge exam. For the standalone and journeyman CET routes, prerequisites differ, with the journeyman route additionally requiring CETa or General Communications Technician Level 1.
Since no weights are published, avoid skipping any category. If you must sequence your effort, build the decibel math and reflection fundamentals first, because they underpin cable, antenna and FDR interpretation questions that follow.
For related background, you can also explore what LAS certification is and the broader LAS certification overview.