About LAS Exam Prep

An independent practice platform for the Line and Antenna Sweeping (LAS) exam - real questions across every exam domain, each with a plain-language explanation.

What's on the LAS exam

The Line and Antenna Sweeping (LAS) exam is organized into 11 knowledge domains. Here is what it covers:

• INTRODUCTION TO ANTENNA SYSTEM COMMISSIONING. Commissioning purpose, benefits and available methods; TDR/FDR comparison and the role and limits of a stand-alone VNA; safe equipment use; system diagrams, common components and commissioning records.
• RADIO FREQUENCY (RF) FUNDAMENTALS. Maximum power transfer; impedance mismatch, reflections and reflection coefficient; VSWR, standing waves and return loss relationships; attenuation/insertion loss; transmitting and receiving electromagnetic waves, atmospheric propagation, and components of commercial/private radio systems.
• RADIO FREQUENCY (RF) MATHEMATICS. Absolute values; decibel power ratios; dBm, dBc, dBd and dBi references, including the 2.15 dB dipole/isotropic difference; power and voltage ratios and their conversion to dB; adding/subtracting dB and instrument-assisted calculations.
• COAXIAL CABLE FUNDAMENTALS. Cable construction and characteristic impedance, including common 50-ohm systems; skin effect; equivalent capacitance/inductance/resistance; velocity factor in FDR measurements and tuned stubs; effects of cable dimensions and frequency on cable loss and impedance.
• COAXIAL CABLE (RF TRANSMISSION LINE/FEEDLINE) INSTALLATION. Hangers, mounting and spacing for cable management and impedance; code/standard grounding requirements and grounding kits; kit installation for reliable sweeps; connector/ground-kit weatherproofing; bend-radius requirements and fault signatures; lightning-protection components, connections and their appearance in FDR traces.
• RF CONNECTORS AND CONNECTORIZATION. Appropriate RF connector types and their specifications; installation tools, cable preparation and torque requirements and errors; passive intermodulation and its effects.
• ANTENNAS AND ANTENNA THEORY. Electric/magnetic fields, electromagnetic waves and polarization; bandwidth, match, gain, beamwidth and tilt specifications; dipole, isotropic, omnidirectional, directional and quarter-wave examples; wavelength calculations and common communication wavelengths; feedline velocity factor and antenna length; radiation patterns and coverage; gain measurement and dipole/isotropic/quarter-wave references; effective radiated power including gains and losses; beamwidth, FDR bandwidth measurement, mechanical/electrical tilt, polarization choices and mounting effects.
• FREQUENCY DOMAIN REFLECTOMETER (FDR) TESTING. Adapters and calibration standards/care; laboratory verification with higher-resolution equipment; 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; component/system insertion loss versus return loss; coaxial attenuation, match and DTF measurements; full-system match/DTF tests and sweep signatures.
• FREQUENCY DOMAIN REFLECTOMETER (FDR) TEST INTERPRETATION. Measured return loss versus manufacturer specifications for antennas, feedlines, connectors, lightning suppressors and other components; expected system return loss using software and functional understanding; map measured distances to diagrams, components, faults and likely causes; interpret sweep signatures and verify antenna specifications.
• FREQUENCY DOMAIN REFLECTOMETER (FDR) OPERATION. Calibration; selecting the frequency range first; setting markers and limit lines and their authority; test mode, amplitude/autoscale and distance range; DTF cable selection; windowing/smoothing; saving, recalling and naming traces; instrument date/time; software tools; sweep records and as-built diagrams.
• FREQUENCY DOMAIN REFLECTOMETER (FDR) TROUBLESHOOTING. Common antenna, cable and connector faults; comparisons of baseline and current traces; appropriate FDR troubleshooting and corrective actions.

Every practice question on this site is organized across these 11 domains, so your study tracks the real exam structure instead of guesswork. As you answer, the per-domain analytics surface the areas still costing you points, so your review goes where it moves your score.

What we believe good exam prep looks like

Realistic practice beats passive reading. Every question is written to mirror the style and difficulty of the real exam, with a clear explanation of why the right answer is right and the others aren't.

Your weak spots should find you. Domain analytics, mistake review, and re-drilling are built in, so study time goes where it moves your score.

Pricing should be simple. One payment for a fixed access window matched to your exam date. No subscription, no auto-renewal, and 10 free questions to try before you spend anything.

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