[Elecraft] help wiring a mic?

[hawley, charles j jr]

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: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net] on behalf of Fred Jensen [k6dgw at foothill.net]
Sent: Friday, July 06, 2018 4:10 PM
To: elecraft at mailman.qth.net
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:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to c-hawley at illinois.edu