[Elecraft] K3: Voice pitch adjustment on SSB

[Brett Howard]

CW is a "tone" and its not illegal to transmit...  So long as you're
within your licenses limits and in band.

~Brett (KC7OTG)

On Fri, 2008-08-15 at 07:59 -0500, Jim Miller wrote:
> I didn't think is was LEGAL to transmit music, "tones" or  even whistle for
> that matter.
> 
> 73, de Jim KG0KP
> 
> ----- Original Message ----- 
> From: "O. Johns" <ojohns at metacosmos.org>
> To: <Elecraft at mailman.qth.net>
> Sent: Thursday, August 14, 2008 6:41 PM
> Subject: [Elecraft] K3: Voice pitch adjustment on SSB
> 
> 
> > Folks,
> >
> > I read the web pages about ESSB, after seeing on the reflector that
> > the K3 now supports it.  It struck me that even ESSB doesn't solve one
> > big issue with voice transmission: PITCH.  Tuning the SSB receiver
> > changes the overall pitch of the received voice.  Unless you have met
> > the sending ham or at least talked to him/her on the phone (or on
> > AM!!), you have no real idea how high- or low-pitched the voice really
> > is.  One can only guess, and get a sort of feel for what a reasonable
> > tuning is.
> >
> > One way to solve this may seem a joke, but it isn't.  Everyone should
> > buy a little 440 Hz pitch pipe, the kind used to tune musical
> > instruments.  Then, say, the net control could blow his pitch pipe at
> > the start of the net and all the listeners could blow their little
> > pitch pipes while listening to net control.  They would all then
> > adjust their receiver tunings until the pitches matched.  Like a
> > shortwave orchestra tuning up.  (Of course, this might violate the FCC
> > rule against music on ham radio, but maybe not if the pitch pipe was
> > near a pure sine wave.  Then the signal transmitted by net control
> > would be just an ordinary CW signal, but at 440 Hz from the net
> > control's suppressed carrier.)
> >
> > A refinement would be to build a pure 440 Hz tone generator into the
> > microphone preamps of radios.  Net control pushes a button while
> > transmitting and it goes out over the air.  The net members push
> > another button while receiving to produce a 440 Hz tone in their
> > speakers along with the received signal from net control.  Then the
> > receiving operators adjust their receiver tuning until the pitches
> > coincide.  For the tone challenged among us, the receiver tuning could
> > even be automated, much like the K3 already does for sidetone on CW.
> >
> > This scheme came to me when I was adjusting the audio parameters on my
> > K2.  I had the K2 running into a dummy load, and was listening to it
> > on headphones plugged into a TenTec RX320D across the room.  Since the
> > K2 was on a dummy load, I tried whistling and was surprised and
> > pleased to find that the PITCH of my whistle didn't match the one I
> > was hearing on the phones.  But I could adjust the RX320D tuning until
> > they did match.  Guarantee of zero beat and realistic pitch in voice
> > reception.
> >
> > Doesn't seem that this would be too hard to do.  Maybe the K3 could
> > even do it in firmware?
> >
> >
> > 73,
> >
> > Oliver Johns W6ODJ
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