[CQ-Contest] 40m lower band edge SSB

David Siddall hhamwv at gmail.com
Wed Nov 2 15:23:17 EDT 2016

Actually, Gerry, the FCC amateur rules are explicit on this very point.
Section 97.307(b): "Emissions resulting from modulation must be confined to
the band or segment available to the control operator."   In other words,
you must keep your emissions entirely within your permitted band.

A properly adjusted  LSB signal will extend about 2.8 kHz below the carrier
frequency.   To comply with band edge, the lowest one can reasonably go
without professionally adjusted and monitored amateur equipment when using
LSB is 7.128, or 3 kHz.   Even this close assumes that your transmitter is
operating correctly and is properly adjusted.

73, Dave K3ZJ

On Wed, Nov 2, 2016 at 11:30 AM, Gerry Hull <gerry at yccc.org> wrote:

> Just to put a fine point on it,  7125 is the band edge.  The FCC regs don't
> say "Don't go within 3 KHz of the band edge", but of course, technically,
> that makes perfect sense.  There are obvious violations outside of this,
> but band-edge violations by mode are probably not something people are
> going to take a coronary about it.  It is best to avoid them. (CW is a
> different story).
> I presume the log checking software uses the actual band edge, and does not
> compensate for LSB/USB.
> Probably most violations occur in the excitement of picking a packet spot
> which is a new multiplier pops up.  One fix is for the contest software
> to prevent picking out-of-band spots for your country or region.
> Gerry W1VE
> On Tue, Nov 1, 2016 at 3:12 PM, W0MU Mike Fatchett <w0mu at w0mu.com> wrote:
> > For the USA it is 7.125, if I wanted to stay legal and keep my LSB signal
> > in the US band I would want to not transmit any lower than say 7.127?
> Do I
> > have this right?
> >
> > W0MU
> >
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