ELECRAFT KRX3 Instruções de Operação descarregar pdf (Página 25)

Locate the four coaxial TMP cables supplied and sort them by length. There are two 6” (15 cm) one 10” (25

cm) and one 12” (30 cm) cables. These are approximate measurements measured from the tip of one connector

to the other. Check the cables as shown in Figure 28 to ensure there are no excess strands of the center

conductor extending beyond the tip of the connector. .

Figure 28. TMP Cable Connectors.

Plug one end of the 10” (25 cm) cable into J84 near the bottom of the auxiliary KSYN3 synthesizer board

installed earlier (see Figure 27). When inserting or removing the TMP connectors, always handle the cable by

the grip as shown in Figure 28. Never pull on the black coaxial cable itself. Be sure you connect it to J84 of the

auxiliary KSYN3 board (the one nearest the side of the K3 shown in the figure) and not the main KSYN3 board.

The other end of the cable will be connected later.

Auxiliary KRX3 Antenna Input (Optional)

Normally, the KRX3 subreceiver will share whatever antenna is in use by the K3 main receiver.

If you plan to use the KRX3 subreceiver to listen on one band while the main K3 receiver is on another band

sharing the same antenna, there are limitations on the combinations of bands you can choose because of the

effect of the bandpass filters used by the main K3 receiver. See Sub Receiver Antenna Selection on page 44 for

details.

The KRX3 has an Auxiliary Antenna input that you can use to have a separate antenna input to the KRX3 rather

than share the common main receiver antenna. There are two ways to route a separate antenna input to the

KRX3.

1. You may bring out the KRX3 Auxiliary Antenna input to a BNC connector on the K3 rear panel directly

below the ANT2 connector. This is the preferred way to connect an isolated receive-only antenna to the

sub receiver.

2. If you have the optional KAT3 installed, you may have the KRX3 subreceiver use the antenna

connected to ANT1 or ANT2 that is not being used by the K3 transmitter and main receiver. A relay in

the KAT3 switches the antenna. For example, if ANT1 is selected for the K3 transmitter and main

receiver, the KRX3 Auxiliary Antenna input will be connected to ANT2. This arrangement requires

well isolated antennas on all bands, otherwise the carrier-operated relay may switch during keying on

some bands. This will compromise QSK operation and may inject noise into your transmitted signal.

See Sub Receiver Antenna Selection on page 44for more information.

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ELECRAFT KRX3 Instruções de Operação Página 25