Question
Which of the following HF digital modes can be used to transfer binary files?
Answer Options
- A) PSK31
- B) PACTOR
- C) RTTY
- D) AMTOR
Correct Answer: B
Explanation
Transferring binary files (such as images, compressed documents, or software) requires a digital mode capable of high data throughput and, more importantly, guaranteed error-free delivery. Modes designed purely for conversational text (like RTTY or PSK31) lack the necessary features for robust file transfer.
PACTOR (Packet Teleprinting Over Radio) is the mode specifically designed for this. PACTOR uses a robust ARQ (Automatic Repeat Request) protocol, which automatically detects errors and requests retransmission of corrupted data blocks. This handshake protocol ensures that data is received bit-for-bit, making it suitable for transferring uncorrupted binary files over challenging HF channels.
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