Elecraft W2 Watt-meter Manual - Manual (Page 6)

6
Rear Panel
REAR PANEL CONNECTOR NOTES:
1. A power cable is provided with your W2 with a mating connector for the W2 at one end
and tinned leads for connecting to a power supply at the other end. An RCA plug is also
supplied that you may connect to use the 12VDC accessory output on the back panel of
the K3. Normally you must push the power ON/OFF button to start the W2 after 12VDC is
applied. If you’d like the W2 to run on automatically when power is applied, a simple mod
is required to add a jumper inside the unit. This modification is described in Appendix C of
this manual.
2. Remote Signaling Connector: Provides an alarm output, dropping from +5V to ground
when the SWR exceeds 3:1 (see note 3 below) on the connector ring. Connector tip is a
logic (0-5V) input provided for possible future use.
3. Remote PTT Control: Relay switched loop-through provided to disable a transmitter or
exciter for high SWR protection if the SWR Alarm is set (see SWR Alarm Function on
page 8.
4. PC Data (Optional): Provides an RS232 data interface that may be used to connect the
W2 to a personal computer. See Computer Interface on page 7 and Appendix B for
details.
5. Sensor 1 and 2: A suitable cable is provided with each Sensor unit to connect it to the
display.