[Elecraft] OT - Old Keyers

[David Christ]

Probably the All-Electronic Ultimatic.  Kaye, John  W6SRY  QST April 1955 p 11 and QST May 1955 P 36.  Four 12AU7 and four 12AT7.   Built on a 4x4x3 base.

David K0LUM


On Jul 4, 2014, at 5:48 PM, Fred Jensen <k6dgw at foothill.net> wrote:

> I knew there was a history to this.  Related question:  About the end of 1956, I and a couple of my teen friends built "electronic keyers" from some magazine article which is long gone from my memory.  I remember they had 8 or so dual triodes [12AT7's/12AU7's ??], had self-completing dots and dashes, and nothing else.  With the power supply, mine weighed about a small brick and was similar in size. Used a relay for the then-ubiquitous cathode keying.  We modified our bugs to key them.
> 
> I'm fairly certain the design pre-dated the TO-Keyer, I think the TO came about 10 years later, and as I recall used fewer tubes.  If any OT's remember the 50's well enough to identify my keyer, I'd appreciate hearing from you.  I had an opportunity to operate as HS1FJ for a few weeks in the mid-60's, Dad sent me my keyer and Lionel J-36, and when we went back to war, I never saw either of them again.
> 
> 73,
> 
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2014 Cal QSO Party 4-5 Oct 2014
> - www.cqp.org
> 
> On 7/4/2014 12:49 PM, Joe Subich, W4TV wrote:
> 
>>> For that matter, why are there two Iambic modes in the first place?
>> 
>> The original "Curtis" Iambic mode completed the element (dot or dash)
>> being sent when [both] paddles were released at the same time.  The
>> iambic mode in the AccuKeyer had a logic error - the element memories
>> were set as soon as the previous element completed - that completed the
>> element being sent and then sent the *opposite* element if both paddles
>> were released at the same time.  This became known as Iambic B to
>> distinguish it from the original Curtis iambic (Iambic A) mode.
> 
> 
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