K9EQ AH-4 Universal Interface
Rev. 5
Page 7
www.hamoperator.com
Fig. 1 Assembled Basic Board
Optional components
The following components are not required and may be substituted as follows (with the corresponding change in protection, RF
immunity or feature). Required substitute action and change is indicated.
F1 – short, provides short circuit protection.
D6 – short, provides reverse voltage protection.
L1-L3 – short, provides RFI protection
D4, R6 – open, provides power on indication.
