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Operation
Preparing for Operation
If you installed the KRX3A sub receiver yourself, you must complete the following before you can operate the
sub receiver:
If you have external speakers connected to your K3, disconnect them and use the internal speaker for the
following procedure.
Enter the CONFIG menu and check the firmware revision level (FW REVS). You must have firmware 5.10
or later (higher number) installed. If you’ve not updated the firmware before, see Firmware Upgrades in your
K3 Owner’s manual for details. Be sure to check the box to load DSP2 for the KRX3A DSP board.
While still in the CONFIG menu, turn tech mode on (CONFIG: TECH MD ON).
Tap DISP and Rotate the VFO B knob to display SYN1 and SYN2 in the VFO B area of the display Verify
that the display reads OK indicating the main (SYN1) and auxiliary (SYN2) synthesizers are operating normally.
In CONFIG, set SPKRS to 1. (You will not hear any audio from the sub receiver if SPKRS is set to 2 as is
frequently done when listening to the main receiver with stereo headphones. After completing the following
steps, refer to the K3 Owner’s manual for more details about listening to both main and sub receivers using line
out, stereo phones or dual loudspeakers.)
In CONFIG, under KRX3A, select one of the following:
ANT=BNC: Specifies that the auxiliary antenna source for the KRX3A is the AUX RF BNC jack on the
rear panel. Use this setting if you connected the AUX RF input to the AUX RF BNC jack, or if you did not
connect anything to the AUX RF input.
ANT=ATU: Specifies that the auxiliary antenna source for the KRX3A is the ATU non-transmit antenna (1
or 2). Use this setting only if you connected the AUX RF input to the TMP jack on the KAT3.
When using the KRX3A auxiliary antenna source, you must have the correct TMP cable installed
between the KRX3A auxiliary antenna input and either the KAT3 or AUX RF BNC connector. See
Auxiliary KRX3A Antenna Input (Optional) on page 26 for details.
Refer to the data you recorded in Table 1on page 33 and set up the filters you have installed as described
under Configuration / Crystal Filter Setup in the K3 Owner’s Manual.
There are other optional calibration procedures and setup choices that you can do at any time, such as calibrating
the S-meter. These are also described in your K3 Owner’s Manual.
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