Elecraft K160RX - Manual (Page 8)

8
Initial Test
Connect a power supply or battery to the DC power jack, J3.
Turn on the K2 and verify that you see the usual E L E C R A F T display. If no display appears, you
probably have a short from one of the PA transistors to ground, which will trip the self-resetting thermal
fuse (F1). You should turn off the K2 immediately in this case and locate the short. In most cases the short
will be due to an incorrectly-installed shoulder washer on either Q7 or Q8.
Use the B A N D + or B A N D - buttons to get to the 160 meter band (1.8-2.0 MHz). If 160 meters does
not appear in the list of available bands, then the K160RX module has not been recognized by MCU
(Control board, U6). Turn off the K2, then unplug the 160-m module and check continuity on the RF board
from pin 2 of U1 to pin 16 of J14. Also verify that R65 is installed. (R65 is on the bottom of the board, near
U1, and is accessible via the bottom cover). Finally, check the resistance of the relay coils on the 160-m
module by measuring between pins 1 and 10 (pin 1 has a round pad, while the others are square). You
should see a resistance of about 250 ohms. If not, you may have the relays installed backwards.
Receive Antenna Switch Test
Note: The receive antenna switch is controlled by the menu's R AN T entry, not the AN T 1 / 2 button on
the front panel. The AN T 1 / 2 button is reserved for use with the KAT2 and KAT100 automatic antenna
tuners, which include two antenna jacks.
Switch to any band other than 160 meters and connect a suitable antenna.
Tap the M E N U button, then scroll to the R AN T entry (receive antenna selection). The parameter
displayed should now be either O F F or O N . If you see "- - ", the K160RX module has not been
recognized (see above).
When the receive antenna switch is turned on, the antenna connected to the RX antenna jack is used
on receive, while the main antenna at J4 continues to be used on transmit. Test this by changing R AN T to
O N . Use
E D I T to select edit mode, and B A N D + / B A N D - or the main tuning knob to change the
parameter. The receiver background noise should disappear when the receive antenna is O N . Then move
the antenna from the main antenna jack (J4) to the RX antenna jack. The background noise should return.
You may wish to connect antennas to both jacks and try switching between them on receive. Never
transmit without an antenna connected to J4.
The receive antenna switch can be set independently on each band. Switch to each band in turn, and
use the R AN T menu entry to verify that the receive antenna is O F F . Recall that you can use E D I T to go
directly from the normal frequency display to the last menu entry used without first tapping M E N U .
If you expect to switch frequently between the main and receiving antennas, you can assign the
R AN T menu entry to programmable function button P F 1 or P F 2 . This will eliminate the need to go into
the menu each time.