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USER MANUAL FOR HARDWARE REV 3.11
07-APR-2018
PAGE 14
6
SERVICE UPGRADES
6.1
ACTIVE HIGH COS/CTCSS INPUTS NOT RESPONDING BELOW ~12V
Affects serial numbers 1813XXXX and lower
The pull up resistors for the COS (R10 and R19) and CTCSS (R12 and R17) inputs are incorrect value at 1.0 kohm. These resistors need to be replaced with 2.2 kohm (0805 size) to achieve proper operation when using active high.
Board Top Side
Board Bottom Side