Podcasting since 2005! Listen to Latest SolderSmoke

Friday, June 19, 2015

Why are relays marked "K" on schematics?

Our official SolderSmoke etymologist and lexicographer Steve Silverman explains:


    Here is some ham radio/electronics trivia
    In the days when amateur radio used short range spark transmitters, multi-station relays were used to move a message across longer distances.  At the end of each transmission, a "K" was sent, which told the receiving operator to commence his relay to the next station. Hence the use of 'K" to designate a relay in a schematic diagram, and "end-of-transmission" for CW operators.  And hence the American Radio RELAY League

Steve Silverman
KB3SII  ... .. ..

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

No comments:

Post a Comment

Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column