Elecraft KRX3 - Manual (Page 38)

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Plug the SUBIN interface board into J64A on the K3 RF board as shown in Figure 46. J64A is directly in
front of the KIO3 board in the rear left corner of the K3. Be certain the connector on the SUBIN board is aligned
with J64A so all pins are engaged.
Figure 46. Mounting the SUBIN Interface Board.
Locate J64B on the K3 RF board. It is between the crystal filters and the front panel shield that holds the
KREF3 and KSYN3 boards. J64B should have a plug in the third hole matching a missing pin on the SUBOUT
connector P1. The plug is shown on the Keying the KRX3 SUBOUT Connector instruction sheet provided with
the kit. If it is not present, install it according to the instructions.
Plug the SUBOUT interface board in J64B on the K3 RF board as shown in Figure 47. J64B is between the
K3 roofing filters and the front panel. Be certain the SUBOUT board is aligned so all pins of P1 are engaged
with J64B.
Figure 47. Mounting the SUBOUT Interface Board.