Re: K3: QRQ high-speed QSK

Posted by W8JI on May 15, 2010; 12:12pm
URL: http://elecraft.85.s1.nabble.com/K3-QRQ-high-speed-QSK-tp5057956p5058929.html

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.



----- Original Message -----
From: "David Cutter" <[hidden email]>
To: "Paul Christensen" <[hidden email]>; "Elecraft Reflector"
<[hidden email]>
Sent: Saturday, May 15, 2010 7:40 AM
Subject: Re: [Elecraft] K3: QRQ high-speed QSK

> 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
>
>
>>
>> There are some really good QRQ ops out there.  W4BQF and
>> W2UP come to
>> mind.
>> I know that W4BQF routinely copies and sends over 100WPM,
>> and he uses an
>> Icom 7700.  Having owned the '7700, its QSK is very
>> fast -- until you add
>> an
>> external amp where keying artifacts begin appearing on
>> anything but the
>> fastest switching amps. The '7800 I owned did not have
>> this problem, nor
>> does the K3.
>>
>> I agree that getting the K3 to run more accurately when
>> using faster CW
>> and
>> an external keyer would be a welcome update -- but not at
>> the expense of
>> introducing any other artifacts (e.g., clicks, delayed
>> T/R time, etc.)
>>
>> Paul, W9AC
>
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