|[AMRadio] RE: T.O. Keyer Follow-Up|
Merz Donald S
merz.ds at mellon.com
Thu Aug 12 14:43:47 EDT 2004
Thanks for all the many responses I received about this. Garey Barrell sent me a copy of the Madison Electronics schematic from Kees' CD and it is very close--dated 6/6/61. So I am learning more as we go.
73, Don Merz, N3RHT
Here is a summary of the replies received so far:
The original design was by Jim Ricks, W9TO, hence the name. The Hallicrafters HA-1 "TO Keyer" came out in 1959 or 1960, and I "think" the original keyer circuit appeared around 1955, but apparently NOT in QST? The circuit was nearly identical to the "original". I also believe this was the first keyer to use "digital" generation methods. Garey Barrell.
A detailed construction article about to build a W9TO keyer may be found in Bill Orr's "West Coast" handbook, 1962 edition, on pages 597 - 600. The unit in the handbook seems to have a circuit that is identical to the T.O. keyers commercially manufactured by Hallicrafters.
According to an Editor's note in the article, "Transistorized Electronic Key and Monitor" in May 1959 QST, a CK722 semi-conductor version of the 9TO keyer, the 9TO Keyer "... has not been described in any periodical, but has been furnished privately by W9TO to a number of amateurs."
There is a 9TO Keyer Mark II described in June 1967 QST, which adds a dot memory to the original tube design. Grant, NQ5T
In my 1964 handbook there is a construction article on and electronic keyer on page 253. Not being familiar with the TO circuit, I can't say for sure. Jim, W5JO
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