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A basic K4 can be upgraded to a K4D by installing the KRX4 option. Similarly, a
K4D can be upgraded to a K4HD by installing a KHDR4 module. Other internal
options and external accessories are applicable to all three models, including
a wide-range ATU (KAT4), MH4 microphone, SP4 external speaker (1 or 2).
For further information, visit www.elecraft.com.
INSTALLATION INSTRUCTIONS
CAUTION: Ground your K4 properly before operation using the provided
wing nut ("GND"). For suggestions, see www.arrl.org/grounding.
Even though the K4 has extensive internal protective circuitry,
external protection against lightning strikes is strongly
recommended, especially in lightning-prone areas.
During storms and when the station is not in use for an extended
period, disconnect ALL equipment from the K4, including antennas,
power supply, routers or hubs, and computers. Ethernet, USB, and
RS232 cables are a frequent source of damaging surge voltages.
Orientation and Air Flow
Provide at least 1" of free space both above and behind the
transceiver. Ventilation holes on the bottom and left sides must also
not be blocked.
Using the Tilt Stand
If the K4 is placed on a desk or table, deployment of the tilt stand is
strongly recommended to facilitate easier interaction with the touch
screen. This will also improve display viewing angle.