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© 2000-2001

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Iambic Keyer IC MK1

© 1997-2001 Michael Keller, DL6iAK


VERSION 1: Speedtuning with paddle



VERSION 2: Analog speedtuning with potentiometer and softener




  • IAMBIC Keyer
  • only version 1: dash/dot-weighting 1:3, 1:4 (jumper)
  • only version 1: dash/dot-memory (can be switched off, jumper)
  • simple speedtuning with paddle (version 1) or by potentiometer (version 2)
  • only version 1: fast speedtoggling between four preinstalled speeds (60,90,120,150)
  • less pieces, small size (keyer-IC, 3 resistants, 1 transistor, 1 key, max. 2-3 C's)
  • current intensity: min. ca. 1 uA, max. ca. 0.5 mA
  • four preinstalled calls (normal, portable, dx, qrp, test)
  • autorepeat
  • only version 2: Softener



  1. Tune up
    Hold the dot paddle until you hear a continuous tone. The rig will now be in transmit, allowing you to do any necessary tuning (aerial matching unit etc). Touching the dash paddle will interrupt.

  2. Speed (only version 1)
    Hold the dot paddle until you hear a continuous tone. While still holding the dot paddle, touch the dash paddle and the keying speed will increase. Touch it again, and the keying speed will decrease.

  3. Toggle speed (only version 1)
    Pushing the memory button while the dot paddle is pushed will let you toggle between preset 60/90/120/150 BpM.

  4. Memory
    Pushing the memory button will send one of these five messages:

    cq cq cq de call call call k
    cq cq cq de call/p call/p call/p k
    cq cq cq dx de call call call dx k
    cq cq cq de call/qrp call/qrp call/qrp k
    cq test de call call k

    Pushing the memory button while a message is playing lets you step through the messages, letting you select the one you need. The keyer responds with 'N', 'P', 'X', 'Q' or 'T' - depending on which you have selected. The message will repeat after 6 or 7 seconds, unless you interrupt it by pushing either paddle.
    Important: If you don't want a slash between the call and qrp (UK) please make a notice when ordering.

  5. Dash/dot ratio (only version 1)
    Setting jumper one changes the ratio to 4:1.

  6. Dash/dot memory (only version 1)
    Setting jumper two will disable the dot/dash memory. The keyer will then not respond to a keyed dot while a dash is in progress (and vice versa).

  7. Softener (only version 2)
    This feature was suggested by Hans, DF3OS. The dot will be time extended by 7-15 ms, the dash/dot pause shortened in the same ratio. This will lead to a hearable better tone quality and a better readability at higher speeds (>120 BpM). The effect will take place from 100 BpM up.


Version 1: 6 US$ (6 €) plus shipping
Version 2: 7 US$ (7 €) plus shipping

Don't forget your callsign and the version number (1 or 2) at ordering.


© 1997-2001 Michael Keller
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