Re: K3: QRQ high-speed QSK
Posted by
David Cutter on
May 15, 2010; 12:21pm
URL: http://elecraft.85.s1.nabble.com/K3-QRQ-high-speed-QSK-tp5057956p5058944.html
Tom
Copied by machine onto tape, then passed slowly in front of a typist who
read the ups and downs and typed from that. My father did this in the 30's
from recordings at >100wpm to his typing speed of about 30wpm. I've seen
the machines in the Poldu museum but they can't demonstrate them because
they are running out of tape!
David
G3UNA
> Who the heck is copying that and what are they copying???
>
> The highest speed record for a long time, of copying unexpected text, was
> only around 70-80 WPM. That record held the whole time I was growing up,
> and it was from the 30's I think.
>
> It is certainly impossible to copy 300 WPM without decoding.
>
> I have some nagging questions about these speed claims.
>
> W8JI
> >
>
>> This is a *little* OT, but I've just read in a 1914 WT book that they
>> were
>> regularly running at 300wpm on spark transmitters. The very clever trick
>> was to operate the spark continuously and FSK it by switching between
>> taps
>> in the antenna tank. The receivers were direct conversion using rotary
>> generators on nominal freq then recording the difference on a pen
>> recorder -
>> I suppose an undulator by another name. I don't think FSK and DC were
>> phrases in common use at the time. Astonishing.
>>
>> David
>> G3UNA
>>
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