Sounds like the 3KHz its not stated explicitly in rules,
but rather implied in the following:
>97.307(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.<
It seems obvious to me that a signal with excessive
splatter would be considered non-compliant as the
distortion sidebands doesn't carry any useful information
and aren't consistent with good amateur practice.
On the other hand, if you have a 10 KHz wide IF
filter in your transmitter and a studio microphone
setup to run cleanly without excessive IMD, then I
suppose one could argue that the signal is no wider
than necessary to convey the information in your voice,
even though the resulting A3J signal could be up to
10 KHz wide. This argument would hinge on your
ability to make the case that there is meaningful
information in your voice spectrum above 3 KHz.
In the case of clean DSB-AM signal, the 2X
additional bandwidth would be okay since it would
be consistent "the emission type being transmitted".
73 de Mike, W4EF...............................
----- Original Message -----
From: "Richard" <2@mail.vcnet.com>
To: "John" <hydro@fx2.com>; " AMPS" <amps@contesting.com>
Sent: Monday, April 01, 2002 3:34 PM
Subject: Re: [Amps] Emission Standards Regarding SSB & AM Bandwidth
>
>
> >
> >
> >
> >§97.307 Emission standards.
> >
> >(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.
> >
> >(b) Emissions resulting from modulation must be confined to the band or
> >segment available to the control operator. Emissions outside the
necessary
> >bandwidth must not cause splatter or keyclick interference to operations
on
> >adjacent frequencies.
>
> ? Every SSB signal splatters somewhat - the question is how many db down
> @ +/- 4kHZ. 40 db is excellent. 30db is tolerable. 97.307 would not hold
> water in Fed. court.
> >
> >(c) All spurious emissions from a station transmitter must be reduced to
the
> >greatest extent practicable. If any spurious emission, including chassis
or
> >power line radiation, causes harmful interference to the reception of
> >another radio station, the licensee of the interfering amateur station is
> >required to take steps to eliminate the interference, in accordance with
> >good engineering practice.
> >
> ? chortle
>
> >(d) ...
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> www.vcnet.com/measures.
> end
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
|