Deep Dive: E2D09
The correct answer is A: Multitone AFSK. What type of modulation is used by JT65 is multitone AFSK. JT65 uses multiple tones with Audio Frequency Shift Keying. For amateur radio operators, this is important for JT65 operation. Understanding this helps when operating JT65.
Why Other Answers Are Wrong
Option B (PSK): Incorrect. PSK isn't used by JT65 - JT65 uses multitone AFSK. PSK isn't the modulation. Option C (RTTY): Incorrect. RTTY isn't the modulation type - JT65 uses multitone AFSK, not RTTY. RTTY isn't the modulation. Option D (QAM): Incorrect. QAM isn't used by JT65 - JT65 uses multitone AFSK. QAM isn't the modulation.
Exam Tip
JT65 modulation = multitone AFSK. Think 'J'T65 = 'M'ultitone 'A'FSK. JT65 uses multiple tones with Audio Frequency Shift Keying. Not PSK, not RTTY, not QAM - just multitone AFSK.
Memory Aid
JT65 modulation = multitone AFSK. Think 'J'T65 = 'M'ultitone 'A'FSK. JT65 uses multiple tones with Audio Frequency Shift Keying. Important for JT65 operation.
Real-World Example
JT65 mode: It uses multitone AFSK (Audio Frequency Shift Keying) modulation. JT65 transmits multiple tones simultaneously, with each tone representing different information. This is the modulation type - multitone AFSK is used by JT65.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E2D
Reference: 2024-2028 Question Pool · E2 - Operating Procedures
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E2D topic.