Elecraft KPA500 Kit Assembly Manual - Manual (Page 28)

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Connect the red/black twisted wire pair from the fan to the power supply module as shown in Figure 37.
Note that although this is a three-pin connector, the connector on the pc board is wired so it may be plugged in
either way.
Figure 37. Connecting the Fan Cable to the Power Supply Module.
Connect the RF INPUT coaxial cable and the RF OUTPUT twisted pair to the PA/LPF module as shown in
Figure 38. The miniature (TMP type) coaxial connector is a friction fit. Insert the connector up to where it
begins to widen to form the “ears” on either side.
Note:
If you ever need to remove this connector, always grab it by the metal ears, not by the coaxial cable.
Figure 38. Connecting the RF INPUT and RF OUTPUT Cables to the PA/LPF Module.