CW Shorthand – Cut Numbers

Have you ever heard someone send a signal report of 5NN? Perhaps you knew it was the same as an RST of 599. Sending the letter ‘N’ for a figure ‘9’ is called sending a cut number. While the  N for 9 is the most common, there is a shortcut or “cut” number for each digit 0 through 9, except for 4 and 6. Another common use of cut numbers is sending a ‘T’ for a ‘0’ as in “am running 1TT watts” meaning 100 watts power.

Another place where cut numbers are common is in large cw contests such as the CQ WW DX contest. The contest exchange is RST and CQ zone number. A report of 599 in CQ zone 12 might be sent as “5NN AU”.

Here are the cut numbers:

Number         Normal Code           Cut Number         Result
  1        di dah dah dah dah      di dah                  A
  2        di di dah dah dah       di di dah               U
  3        di di di dah dah        di di di dah            V
  4        di di di di dah         di di di di dah         4
  5        di di di di dit         dit                     E
  6        dah di di di dit        dah di di di dit        6
  7        dah dah di di dit       dah dah dit             G
  8        dah dah dah di dit      dah di dit              D
  9        dah dah dah dah dit     dah dit                 N
  0        dah dah dah dah dah     dah                     T
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