16
OPERATION
INITIAL TURN ON
The POWER toggle switch has three positions, the center position is OFF, up
selects the “FIELD STRENGTH” mode of operation, and down selects the “POWER METER”
mode of operation.
FIELD STRENGTH MODE
In the FIELD STRENGTH mode, the tester receives its signal off the air from the beacon’s
transmitting antenna or radiating source. If the “FIELD STRENGTH” mode has been selected, a
message will be displayed prompting you to select either the “CONTINUOUS 121.5” field
strength mode, “PREVIOUS”, on the function switch, or “TO CONTINUE”, “NEXT”, on the
function switch. If the “CONTINUOUS” mode was selected, the tester will continuously monitor
the 121.5 Mhz. and continuously display the results using either a numeric value or bar graph
presentation. This mode is helpful in determining the radiation pattern of a transmitting
antenna on 121.5 Mhz. or in identifying the source of an active 121.5 beacon. While in the
continuous 121.5 mode, the toggle can be used to select between the numeric or bar graph
display (PREVIOUS) or to exit the continuous mode (NEXT). The continuous mode is not useable
for the 406 Mhz. signals because of the intermittent nature of the 406 Mhz. transmissions, and
is not practical or available. However, the beacon sends an identifying code that the tester will
display and can be used to identify the source of the signal.
With the normal FIELD STRENGTH mode selected, when the tester receives a signal on 121.5
Mhz. it measures the frequency, modulation, and relative field strength. Once the
measurements have been completed, the display will indicate the status of each measurement
as either “OK” or if incorrect for example “Modulation low”, and illuminate the 121.5 LED either
GREEN for ok, or RED for defective. If the FUNCTION SWITCH is toggled to “NEXT”, the display
will switch to the 121.5 Mhz. values page and display the actual measured values of the
received signal on 121.5 Mhz. Now toggling the FUNCTION SWITCH to “NEXT” will return the
display to the ready page, while toggling to “PREVIOUS” will return to the status page. Once
the 121.5 Mhz. portion of the ELT has been tested, even though it may still be running, or be of
an intermittent transmission type, the tester will ignore it until the tester is reset.
If the 121.5 Mhz. ELT is running and you desire to mute out the audio, once the test has been
completed, and the ready page is being displayed, toggling the FUNCTION SWITCH, while
receiving a signal on 121.5 Mhz, to “PREVIOUS” (down) will mute the 121.5 Mhz. audio, toggling
To Next Page
Loading...