Source: https://ham.stackexchange.com/questions/10313/is-there-a-legal-limit-to-the-bandwidth-of-a-signal-used-in-the-amateur-bands/10315
Timestamp: 2019-12-07 08:41:24
Document Index: 547922144

Matched Legal Cases: ['§97', '§97', '§97', '§97', '§97', '§97', '§97']

united states - Is there a legal limit to the bandwidth of a signal used in the amateur bands? - Amateur Radio Stack Exchange
While a normal voice channel is ~10kHz-15kHz in bandwidth, some digital modes can be significantly wider.
Are there any legal restrictions on how much bandwidth I could use for amateur radio communications (e.g. video chat over ham radio)?
edited May 19 '18 at 3:17
$\begingroup$ It would be helpful if you would indicate the applicable country as regulations can vary by country. $\endgroup$ – Glenn W9IQ May 19 '18 at 2:15
$\begingroup$ @GlennW9IQ done. $\endgroup$ – Stack Tracer May 19 '18 at 3:17
$\begingroup$ It depends on which band you’re in.... and how you consider spreads spectrum bandwidth .... $\endgroup$ – RoboKaren May 19 '18 at 4:43
In all cases, no more bandwidth than necessary. §97.307(a), (b)
In data portions of LF, MF, and HF bands, 500 Hz. §97.3(c)(2)
In the phone portions of LF, MF, and HF bands, no more than "the bandwidth of a communications quality phone emission of the same modulation type." 4 kHz is a good number to put on it, being a typical limit of an SSB emission. §97.307(2)
6 and 2 meters: 25 kHz. §97.307(5)
1.25 m and 70 cm: 100 kHz. §97.307(13), (8)
everything above 70 cm: no explicit limitation: follow "good amateur practice."
For reference, relevant sections of §97.307 (emphasis added):
The definition of "Data" in §97.3(c) includes a limitation on bandwidth:
edited May 21 '18 at 15:43
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