Elecraft KAT2 User Manual

Page 13

Check the orientation of J8 carefully as described below before turning on power. Some

components could be damaged if power is applied with J8 plugged in incorrectly. If you have the
KIO2 serial interface option installed, J8 must be connected to P1 on the KIO2's "AUX2" junction
board rather than directly into the K2 Control board (see KIO2 manual).

Connect J8 (from the ATU Control board) to P4 (on the K2 Control board). The green wire (indicated

by the arrow on J8) corresponds to pin 2 of P4, and that end of J8 should be closest to the top edge of the
K2 Control board. Make sure that J8 is mated with all 10 pins of P4.

Mark the arrow end of J8 using model paint, nail polish, or an adhesive label with "UP" written on it.

Preliminary Tests

Do not transmit during these tests. Keep the ATU RF connector (J7) disconnected.

If you have the KIO2 serial interface option installed, you should disconnect it from the K2 control
board until KAT2 testing is complete. The KAT2 and KIO2 can then both be connected to the
control board using the small junction board supplied with the KIO2.

Connect a power supply or battery to the K2 and turn on power. If you see or smell smoke, turn

power OFF immediately. Check all connections and refer to the Troubleshooting section if necessary.

Tap

D I S P L A Y

to check the receive-mode current drain. The reading should be the same as you saw

earlier without the ATU module connected, or at most 20 mA higher. (Since current drain resolution is only
20 mA, it could appear to be 20 mA higher even though the actual increase is just a few milliamps.) An
increase of more than this could indicate a short on the ATU Control board.

Tap

M E N U

and scroll through the entries until you find ATU. If the ATU Control board is

functioning, you'll see a parameter on the right end of the LCD. Hold

E D I T

to modify the parameter. If you

see two dashes (--) instead of the ATU parameter, refer to Troubleshooting.

Using the VFO knob, scroll through the ATU menu parameters. You may hear relays turning on and

off as you select various entries. You should see CALn, CALP, CALS, AUTO, ALT, POUT, etc.
Each menu entry will be explained in the Using the ATU section.

Set the ATU parameter to L0. You should hear a relay switch when you move from L0 to L1, then

to L2, etc., up through L8. The same should be true for C0 through C8, as well as N1 and N2. If you
don't hear any relays switching, see Troubleshooting.

Set the ATU parameter to AUTO and exit the menu.

Turn power off and back on. Use the menu to verify that the ATU parameter is still set to AUTO. If

not, U2 on the ATU (the EEPROM) may be installed backwards or have an unsoldered or shorted pin.

Tap the

AN T 1 / 2

button, which is below the

D I S P L AY

button. You should hear a relay switching,

and when antenna 2 is selected the ANT 2 annunciator will turn on. Leave the antenna set to ANT 1.

Turn off the K2 and disconnect the power supply.