Elecraft W2 Watt-meter Manual - Manual (Page 5)

5
Operation
Typically the W2 is inserted between the transmitter and an antenna tuner, if one is used. The W2 then displays
the SWR presented to the transmitter. If the W2 is inserted between the antenna tuner and antenna, it will show
the antenna's unmatched SWR. The power reading may be less accurate when the unmatched SWR is high.
The purpose and operation of each control and indicator on the front panel is described below. On the next page
the rear panel is shown with descriptions of the cable connections and functions of each connector and control.
Front Panel
IMPORTANT NOTES:
1. An automated power-on test cycles all of the front panel LEDs on and off when the POWER button is
pressed. Also, the PTT RY (see Note 3 on the next page) cycles; you can hear it click in a quiet
environment.
2. If the Alarm function is set, all the front panel LEDs will flash if the SWR exceeds 3:1 until you reset the
W2 by pressing either the SENSOR or the RANGE button. See SWR Alarm Function on page 8.
3. The SENSOR, RANGE and PK HOLD settings you select are automatically reinstated after the power
has been turned off.
4. The power display is not affected by the SWR.
5. If two sensors are connected, the W2 can be made to search for the sensor receiving RF. Hold the
SENSOR switch until the S1 and S2 LEDs alternately flash, indicating the W2 is searching. When RF is
applied the active sensor LED will light steady. When RF is removed, the search operation will resume.