ELECRAFT K3EXREF Installation And Operation Manual

2, 2 Contents Introduction ............................................................................................................................................. 3 Customer Service and Support ...............................................................................…

3, 3 Introduction The K3EXREF option locks the K3's reference oscillator frequency to an external 10 MHz source by automatically controlling the REF CAL function. While locked to the external source, the K3’s reference oscillator frequency is maintained within 2 Hz. Since the K3EXREF do…

9, 9 Installing the K3EXREF Board Temporarily remove the coaxial cables at J2 and (if present) J1 on the KREF3 board. Handle the connectors by the grip (see Figure 6). Do not pull on the black coaxial cable. Figure 6. TMP Cable Connectors. Carefully remove the mounting screw …

7, ELECRAFT K3EXREF 7 Figure 2. Freeing the K144XV Module. 3. Unplug the coaxial cables leading to the K144XV module and set the module aside. The coaxial cables have friction-fit TMP connectors that simply pull out of the sockets (see Figure 6 on pg 9). Pull on the metal connector grips. Do not pull …

4, 4 Using the K3EXREF If you are installing the K3EXREF yourself, go directly to Installing the K3EXREF below. The operation of the K3EXREF is automatic, once a suitable signal is applied to the K3’s rear-panel REF. connector. To confirm the external reference controls t…

12, 12 Appendix A - KREF3 TMP Cable Connections These illustrations show the TMP cable connections to the KREF3 board for reference during reassembly. Refer to Installing the K3EXREF on pg 4 for installation details. Note that the K3EXREF SMA cable that connects to the KREF3 bo…