Amateur ExtraE2B09
What kind of receiver can be used to receive and decode SSTV using the Digital Radio Mondiale (DRM) protocol?
D
Answer
Operating procedures and special operations
Type
A
CDMA
B
AREDN
C
AM
D
SSB
Answer Notes
Digital Radio Mondiale (DRM) is a digital broadcasting standard originally designed to replace analog shortwave AM. However, amateur radio operators have adapted DRM software protocols to transmit high-resolution Slow Scan Television (SSTV) and digital data over HF bands.
To transmit and receive this digital information on HF, amateurs use standard Single Sideband (SSB) transceivers. The sending computer generates audio tones representing the digital DRM data, which are transmitted via an SSB radio. The receiving SSB radio demodulates the RF signal back into audio, which is then fed into a computer sound card for software decoding.
While commercial DRM was meant to replace AM broadcasts, amateurs do not use AM receivers for this purpose on HF bands due to bandwidth regulations and power efficiency constraints. CDMA and AREDN are entirely unrelated digital and networking protocols.
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What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band?
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What aspect of an analog slow-scan television signal encodes the brightness of the picture?