LAS practice questions - frequently asked questions
Plain answers about how LAS Exam Prep works: the exam, the questions, pricing, the free trial, and what you actually get.
No - and you should be wary of any site claiming otherwise. Every question here is original, written to mirror the style, difficulty, and judgment the real LAS exam tests. Each one comes with a plain-language explanation of why the right answer is right and the others aren't.
The LAS exam spans 11 domains: 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 tagged to one of these domains.
1,000+ questions across all 11 LAS exam domains, mixing scenario-style multiple choice with true/false drills, each with a plain-language explanation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That is the difference between hoping you're ready and knowing where you stand.
Yes - 10 free questions with full explanations, no card and no signup required. Start on the home page.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and (on Fast Track and Pass Confidence) progress analytics that show your readiness by domain.
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Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
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