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It's just history and regulatory inertia. The rules were established when digital radio was nascent and available technology limited the modulation techniques
by topspin 5y ago
It's just history and regulatory inertia. The rules were established when digital radio was nascent and available technology limited the modulation techniques that were feasible. Digital on some bands is regulated on bandwidth; the 70 cm band has a bandwidth limit of 100 kilohertz for "unspecified digital codes."
- drmpeg 5y agoThe 70 cm rule is the silliest. The limit for digital data is 100 kHz, but you can legally transmit 6 MHz wide analog television. Because wide bandwidth video is allowed, digital video modes like DVB-S, DVB-T and ATSC are also allowed. To get around the 100 kHz restriction for data, some folks are running links with 95% data and a low rate video sub-stream.