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Author Topic: ultra high speed cw  (Read 5254 times)
VP9HW
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Posts: 43




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« on: August 25, 2016, 08:14:21 PM »

Hi,
I have been a ham for years but never delved into ultra high speed cw (used in meteor scatter).
The Logikeyer manual mentions speeds up to over 900 wpm and that the sigs can be slowed down with tape recorders.
What information is available to generate and slow down ultra speed cw and where can I find it?
Please advise.
Many thanks de Steve (vp9hw)
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K8AXW
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Posts: 6305




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« Reply #1 on: August 26, 2016, 08:12:48 PM »

Steve....let me tell you how it was done 60 years ago.  There was an ink pen recorder that was connected to a receiver.  When code speeds up to 1000wpm was being received the in pen would make corresponding blips on a moving paper strip according to the dits and dahs. This was manually adjusted.

When the run was over the 3/8" wide paper tape was run through a slotted "puller" at a speed determined by the operator and his typing ability.  The dit and dah combination was "read" by the operator.  Try that at 45wpm!

Sometimes after a run was made there was a pile of paper tape on the floor a couple feet deep. Great fun!
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ONAIR
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Posts: 3523




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« Reply #2 on: August 27, 2016, 09:24:43 AM »

Today, ultra high speeds can be done via computers!  Smiley
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K8AXW
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Posts: 6305




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« Reply #3 on: August 28, 2016, 10:07:05 AM »

ONAIR:  Yes, I know.  60 years ago we cleaned up transportation 'exhaust' with a shovel!   Cheesy

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N0YXB
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Posts: 1120




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« Reply #4 on: August 30, 2016, 08:40:09 AM »

http://www.qsl.net/w8wn/hscw/hscw.html
http://www.qsl.net/dk3xt/hsms.htm
http://www.newsvhf.com/hscwms.html

Maybe these links will help.
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G4IJE
Member

Posts: 324




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« Reply #5 on: August 31, 2016, 12:29:09 PM »

I'm a little out of touch with the VHF DX scene, but I believe HSCW is pretty much extinct these days. It was very popular in Europe in the 1970s and 80s; less so in the USA. The data modes such as those in the WSJT software have replaced it.

73, Paul G4IJE.
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