Good answer. A friend once petitioned the FCC to disallow AM. The answer he got from the FCC was that Amateur Radio was an experimental medium and as such, disallowing emission types was counterintuitive.
The word experimental tends to question some of the hard and fast rules that come up from time to time.. Chuck Amateur Radio, KE9UW ________________________________________ From: [email protected] [[email protected]] on behalf of Fred Jensen [[email protected]] Sent: Friday, July 06, 2018 4:10 PM To: [email protected] Subject: Re: [Elecraft] help wiring a mic? 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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
