Jim,
Does conjure up a picture, doesn't it? Of course, only net control
would transmit. The others would just blow and listen. And, of
course, actual pitch pipes are not the way to go. Too spectrally
impure.
73,
Oliver W6ODJ
On 14 Aug 2008, at 5:14 PM, Jim Cox wrote:
Would love to hear a bunch of hams with pitch pipes. I think we
have enough qrm as it is. Thanks goodness I stay away from nets.
Jim K4JAF
----- Original Message ----- From: "O. Johns" <[EMAIL PROTECTED]>
To: "Jim Cox" <[EMAIL PROTECTED]>
Sent: Thursday, August 14, 2008 7:00 PM
Subject: Re: [Elecraft] K3: Voice pitch adjustment on SSB
Nope. Not kidding. Not at all.
73,
W6ODJ
On 14 Aug 2008, at 4:54 PM, Jim Cox wrote:
I think your a bit ahead of Aprils Fools day! You must be kidding
OM
----- Original Message ----- From: "O. Johns"
<[EMAIL PROTECTED]>
To: <[email protected]>
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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