- The Exam at a Glance: Format, Fees and Rules
- Exam-Day Rules That Trip People Up
- The 17-Domain Cheat Sheet
- The Common Formulas Sheet and Calculator Strategy
- Quick-Reference Table: Numbers Worth Memorizing
- Retakes, Renewal and Staying Certified
- What Is Not Published
- Scheduling the Domains by Week
- Frequently Asked Questions
- The written exam has 75 questions in 2 hours, and the passing score is 75%.
- The USD $105 fee excludes the $16 remote proctoring add-on, which is charged again on retakes.
- ETA permits its Common Formulas Sheet (copyright 2025) during the GCT1 exam, plus a non-programmable or scientific calculator.
- One free retake is available after a 30-day wait, within one year of your first sitting.
The Exam at a Glance: Format, Fees and Rules
This page condenses the verified, must-know facts about the General Communications Technician - Level 1 (GCT1), the ETA International credential for technicians working in radio, public-safety and business/commercial communications. If you are brand new to the credential, start with What Is GCT1 Certification? and come back here for the quick-review layer.
The GCT1 is a stand-alone introductory credential. CETa and GCT2 are not prerequisites, and no hands-on practical portion is required. The entire assessment is a written knowledge examination.
Format Snapshot
Everything you need to know about the sitting itself:
- Questions: 75 on the written knowledge examination
- Time: 2 hours
- Passing score: 75%
- Delivery: Trapeza computer-based or paper/pencil exams proctored by ETA Certification Administrators, or remote proctoring via ExamRoom.AI arranged through ETA
- Fee: USD $105; remote proctoring adds $16 for this two-hour exam
The $105 fee is the figure currently published by the issuer. ETA Press's indexed listing shows $100, but that conflicts with the current issuer price, so treat $105 as the number to budget around. Optional training and study materials cost extra. For a fuller cost breakdown, see GCT1 Certification Cost 2026: Complete Pricing Breakdown.
Exam-Day Rules That Trip People Up
Many candidates lose focus before the first question because they misjudge the logistics. The general testing rules that apply to ETA exams include:
- Photo ID is required. Bring valid identification to the testing site or have it ready for the remote proctor.
- Phones are prohibited. Plan to leave yours out of reach.
- Scratch paper is allowed, but used scratch paper must be surrendered at the end.
- A non-programmable or scientific calculator is allowed. Do not bring a programmable model.
- You may not leave the room after testing begins. Handle everything beforehand.
- Remote testing has equipment requirements. Check them well before your appointment rather than on exam morning.
The 17-Domain Cheat Sheet
ETA publishes the GCT1 scope as a seven-page Competency Requirements document (copyright 2023) with 17 numbered headings, 1.0 through 17.0. ETA states that examination questions derive from these competencies. They are official examination competencies, not course modules. The competency listing ends on page 6; page 7 holds the advisory board.
Official percentages or question counts per domain are not published, so do not trust any source that claims "Domain X is 20% of the exam." Study all 17 evenly, then weight your extra time toward your weakest areas. The full walkthrough lives in GCT1 Exam Domains 2026: Complete Guide to All 17 Content Areas; here is the compressed version.
Foundations: Domains 1 to 5
Domain 1: Safety
Expect scenario-style thinking about working around energized equipment, RF exposure, and work at height, since communications technicians climb towers and work near transmitters.
- Know the hazards you are most likely to encounter on a site visit
- Know the protective practices that keep you and others safe
Domain 2: Electronic and Electrical Theory
The bedrock for everything that follows.
- Ohm's law and power relationships
- Series and parallel circuit behavior
- AC versus DC concepts and basic component behavior
Domain 3: Tools and Components
Recognize common components and the tools used to install, terminate and service communications equipment.
- Match the tool to the task
- Identify components and their roles in a circuit
Domain 4: Connectorization
Connectors are everywhere in communications work, and poor terminations are a leading source of field problems.
- Know connector families and what they are used with
- Understand why proper installation matters for signal quality
Domain 5: Power Systems
Communications sites depend on reliable power.
- Primary power, backup power and battery fundamentals
- Why power quality matters to radio and network equipment
The RF Core: Domains 6 to 10
Domain 6: Radio Frequency (RF) Fundamentals
Frequency, wavelength, bands and propagation are the vocabulary of the whole field.
- Practice the frequency and wavelength relationship until it is automatic
- Know decibel concepts, which show up across multiple domains
Domain 7: Radio Types and Systems
Understand how different radio systems are organized and how they serve public-safety and business users.
- Transmitter and receiver roles
- System types and how they differ in purpose
Domain 8: Antennas
Know common antenna types, what they are used for and the concepts of gain and pattern.
Domain 9: Transmission Lines
Cable and line behavior links directly to connectors and antennas.
- Loss, impedance matching and standing-wave concepts
- Why mismatches hurt performance
Domain 10: Interference
Know common interference sources and the general approach to identifying and mitigating them.
Systems and Infrastructure: Domains 11 to 17
Domain 11: Data Networks
Modern communications equipment is networked. Review core networking concepts and how data travels between devices.
Domain 12: Fiber Optic Systems
Understand how light carries signals, common fiber types and the basics of handling and testing fiber.
Domain 13: Test Equipment and Methods
Know what each instrument measures and which one fits which job. This domain rewards hands-on familiarity.
Domain 14: Telephony Communications
Cover the fundamentals of voice systems used in business and commercial settings.
Domain 15: Satellite Communications
Review the basic architecture of satellite links and the concepts that distinguish them from terrestrial systems.
Domain 16: Environmental Systems
Communications equipment needs the right operating environment. Review the supporting systems that keep sites within safe operating conditions.
Domain 17: Physical Plant / Head End and Security Systems
Know the physical infrastructure of a communications facility and the basics of securing it.
The Common Formulas Sheet and Calculator Strategy
ETA's Common Formulas Sheet (copyright 2025) is specifically permitted during the GCT1. The copyright year identifies the document, not a GCT1 exam revision, so do not read it as a sign that the exam changed in 2025.
The smart way to use it:
- Download it now from ETA and read it before you start serious studying.
- Practice every calculation problem with the sheet beside you, so locating a formula becomes quick on exam day.
- Use a non-programmable or scientific calculator you already know how to operate, ideally the same one you bring to the exam.
- Do not rely on the sheet to teach you concepts. It tells you the formula, not when to apply it or what the result means.
Key Takeaway
A formula sheet saves you from memorization, not from understanding. Spend your study time on knowing which relationship a question is testing, then let the sheet confirm the arithmetic.
Quick-Reference Table: Numbers Worth Memorizing
| Item | Verified Detail |
|---|---|
| Number of questions | 75 |
| Time limit | 2 hours |
| Passing score | 75% |
| Exam fee | USD $105 |
| Remote proctoring add-on | $16, payable again on a retake |
| Free retake | One, after a 30-day wait, within one year of first sitting |
| Certification term | 4 years |
| Maintenance fee | $25 per year ($100 per cycle) |
| Continuing education | 10 hours per year (40 over four years), or Employer Verification |
| Competency headings | 17, numbered 1.0 to 17.0 |
For the scoring detail behind the 75% figure, read GCT1 Passing Score 2026: Exactly What You Need to Pass. For realistic expectations about difficulty, see How Hard Is the GCT1 Exam? Complete Difficulty Guide 2026.
Retakes, Renewal and Staying Certified
The Free Retake
If you do not pass, one eligible free retake is available. You must wait 30 days, and the retake must be completed within one year of your first sitting. The free retake is not available merely to try to improve a passing score. If you choose remote proctoring for the retake, the $16 add-on is payable again.
Maintaining the Credential
The certification term is 4 years. To maintain it, ETA's general maintenance requirements call for:
- The Certification Maintenance Form
- Either 10 continuing-education hours per year (40 over four years) or a supervisor-completed Employer Verification for relevant employment
- $25 per year ($100 per cycle)
ETA recommends submitting annually rather than waiting until the end of the cycle. An undated Maintenance Overview PDF mentions a $45 annual figure for international certificants, but it does not list GCT1 and its applicability is unverified. The live maintenance page gives $25 with no regional distinction, so use $25 for planning and confirm with ETA if you are testing outside the United States.
What Is Not Published
A good cheat sheet is honest about its gaps. The following are not published in the sources reviewed:
- Official percentage weights for any of the 17 domains
- The split between scored and unscored questions
- The exact mix of question types
- The raw number of correct answers needed to reach 75%
- A quantified education, experience or training-hour minimum
On eligibility, there is also a source difference worth knowing about. ETA's 2026 GCT1 workshop listing says there is no prerequisite, but that is a course statement. ETA's badge criteria mention practicing-technician experience, a written exam and acceptance of the Code of Conduct, without giving a duration. That difference is unresolved, and GCT2's prerequisites are not transferred to GCT1. For the full picture, see GCT1 Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Scheduling the Domains by Week
Because the exam is a broad written test across theory, RF, networking and infrastructure, the order you study matters more than the method. Build theory first, because later domains depend on it. A fuller approach is in GCT1 Study Guide 2026: How to Pass on Your First Attempt; this is the compact version.
Theory and Safety
- Domain 1 (Safety) and Domain 2 (Electronic and Electrical Theory)
- Download the Common Formulas Sheet and work every problem with it open
Hardware Basics
- Domains 3, 4 and 5: Tools and Components, Connectorization, Power Systems
The RF Chain
- Domains 6 through 10, studied in order so antennas, lines and interference build on RF fundamentals
Networks and Media
- Domains 11, 12 and 13: Data Networks, Fiber Optic Systems, Test Equipment and Methods
Systems and Facilities, Then Review
- Domains 14 through 17: Telephony, Satellite, Environmental Systems, Physical Plant / Head End and Security Systems
- Finish with timed practice at the real 75-question, 2-hour pace using the GCT1 practice tests
Timed practice matters here because 2 hours for 75 questions leaves roughly 1.6 minutes per question, which is comfortable for recall questions but tight when calculations are involved. Use our practice exams to rehearse that pace, and review every miss against the relevant domain.
Key Takeaway
Tie each missed practice question back to one of the 17 competency headings. Patterns in your misses tell you where to spend extra time far better than general rereading does.
Frequently Asked Questions
The written knowledge examination has 75 questions and a 2-hour time limit. The passing score is 75%. The split between scored and unscored questions is not published.
Yes, within limits. ETA specifically permits its Common Formulas Sheet (copyright 2025), and general testing rules allow a non-programmable or scientific calculator and scratch paper. This does not make the exam fully open-book, and used scratch paper must be surrendered.
One eligible free retake is available after a 30-day wait, and it must be completed within one year of your first sitting. It is not available simply to improve a passing score. The $16 remote proctoring fee is payable again if you retest remotely.
The term is 4 years. Maintenance requires the Certification Maintenance Form, either 10 continuing-education hours per year or supervisor-completed Employer Verification, and $25 per year ($100 per cycle). ETA recommends submitting annually.
No. No hands-on exam is required. The assessment is the written knowledge examination, which draws on the 17 published competency headings from Safety through Physical Plant / Head End and Security Systems.
If you are weighing whether the credential fits your career plans, see Is the GCT1 Certification Worth It? Complete ROI Analysis 2026 alongside this review sheet, and keep the 17 domains in front of you as your study checklist.