Question
What kind of receiver can be used to receive and decode SSTV using the Digital Radio Mondiale (DRM) protocol?
Answer Options
- A) CDMA
- B) AREDN
- C) AM
- D) SSB
Correct Answer: D
Explanation
Digital Radio Mondiale (DRM) is a digital mode primarily designed for shortwave broadcasting but has been adopted by amateurs for various digital transmissions, including digital Slow-Scan Television (SSTV). The DRM signal itself, despite being digital, is transmitted using a modulation technique that mimics a standard narrowband radio signal.
DRM-SSTV, like many other digital modes on the HF bands, is typically transmitted within the audio passband of a standard voice channel using a technique called Amplitude-Shift Keying (AFSK) or similar modulation overlaid onto a single-sideband carrier. Therefore, the signal is received and demodulated using an SSB (Single Sideband) receiver, which passes the audio-frequency data tone to a computer sound card or digital signal processing (DSP) unit for final decoding.
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