Figure 99. Location Of U15 Between Afa And Keyer Chips. Test Pins 11, 12, And 13 - NORCAL NC2030 Manual

Figure 99. Location of U15 between AFA and Keyer chips. Test pins 11, 12, and 13

In the receive mode, pin 11 is at 5v, pin 12 is at 1.4v (a high frequency square wave), pin 13 is 0v.
When sending a series of low speed dashes, pin 11 will toggle between 5v and 2.5v (2.5v is the PA
driver high frequency square wave), pin 12 will stay at 1.4v, and pin 13 will vary between 0 and 2.9v.
Norcal NC2030 v5 12-18-05
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