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Wednesday, January 14, 2009

An Iambic keyer rated for cathode keying

When using my vintage transmitters I've missed not having a keyer. Many older tube transmitters are cathode keyed. The voltage across the key terminals can be high enough to fry the output transistor of a typical modern keyer. In some cases the voltage can even be high enough to be a safety problem.

I already had a K1EL K10 keyer board ( ). I added a Keyall from Jackson Harbor Press ( ) to make a keyer capable of keying up to 500V. It works great! I even installed a jack for a straight key so that I use the K10 CW monitor plus the Keyall isolator on Straight Key Night.

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