Back in the 70s I had a three head reel to reel tape recorder. The
separate record and playback heads allowed you to monitor what you'd
just put on the tape, but a fraction of a second later. We discovered
that we could have great fun with this ... put headphones on the victim,
turned up
On 9/1/2012 10:43 PM, Joe Subich, W4TV wrote:
Empirically the issue starts to become noticeable when the delay is
more than an element (dit/dah) and certainly becomes critical when
the delay is a substantial part of a letter.
Yep, actually one dit time delay [or even close to it] is really
On 9/2/2012 9:51 AM, Fred Jensen wrote:
Somehow, we managed to
key the transmitters multiple miles away with no noticeable delay. I
never got to the TX site so I don't know how they did it.
A few years ago I visited both TX and RX sites for KPH, the coast
station north of San Francisco,
On Sat, 1 Sep 2012, Jim Brown wrote:
A common real world example is a star singing the Anthem at home
plate, with an acoustic delay of 120-150 msec through the sound system
to the singer's ears. The solution is simple -- we give the singer
undelayed sound from his/her mic into headphones or
On 9/1/2012 5:58 PM, Bill Frantz wrote:
Thanks for telling us about this feature.
Psychoacoustics is the study of the human perception of sound, and its
practitioners are a part of the Acoustical Society of America, of which
I am a member. The discipline is quite well developed, and what these
Back in the old days many of us used no sidetone at all. We just listened
to the clatter of our straight keys. In High School I could chat with my
fellow hams in class with gentle taps of a pencil on the desktop.
But I agree, I needed sidetone when I switched to a keyer.
Funny, it was supposed
I don't know of any studies relating to delays and our ability to
send CW.
Empirically the issue starts to become noticeable when the delay is
more than an element (dit/dah) and certainly becomes critical when
the delay is a substantial part of a letter. Just like the soloist
and the
Hi George,
Great to hear from you. Henry was mondo cool. A google search will
turn up lots of interesting stuff. For the last couple of decades of
his life he was the chief scientist for our country, founding director
of the Smithsonian. The entire US government closed down the day he died
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