It depends on the emission type. From 47CFR97.307:
"(a) No amateur station transmission shall occupy more bandwidth than
necessary for the information rate and emission type being transmitted,
in accordance with good amateur practice."
At 97.307, there follow numerous specific limits on spurious emissions,
limits on various forms of angle modulation, and an [in]famous symbol
rate limit of 300 on data emissions. Thus:
If you're transmitting voice using AM, an occupied bandwidth of between
5 and 6 KHz would be compliant [nominal 0-2.5 KHz audio BW]. For SSB,
it would be roughly 2.5-3.0 KHz. If you're transmitting CW, the
occupied bandwidth would need to be something around 0.1 KHz. A data
transmission could occupy any BW so long as its symbol rate remains at
or below 300.
The rules are a little ambiguous as a result of the phrase, "for the
information rate and emission type being transmitted". If ESSB is
considered to be an independent emission type, then it is compliant ...
it fills the BW it was intended to. If it is considered to be a form of
standard, communications-quality SSB, then it may not totally compliant.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/6/2018 9:16 AM, hawley, charles j jr wrote:
What is the "legal" bandwidth allowed on amateur radio?
Chuck
KE9UW
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