14
3. VHF Telephone Operation
3.1 Turning the Power On/Off
To turn on the FM-2721 press the [POWER] switch in
the hanger. The illumination LED in the [POWER]
switch lights. Press the switch again to turn off the
power.
3.2 Listening for Telephony Calls
International rules require that all ships monitor channel
16 continuously.
1. Select channel 16 by press the [CH16] key. The
display shows “16”.
I N T L S I M P 2 5 W
W a t c h V H F C H 7 0
R x 1 6
L a t : 4 5 . 2 3 N
L o n : 1 2 1 . 8 8 E
T i m e : 1 0 : 5 7 U T C
V O L : 0 8
S Q : 0 3
2. Adjust loudspeaker volume by pressing [ ] [ ] (three
sub-levels in a main level, see 3.7 Adjusting
Loudspeaker Volume).
3. (Manually) Set the squelch level with the [SQ ] key
(“SQ:XX” on the LCD is displayed in reverse video)
and then press [ ] or [ ] key. Adjust the squelch so
that noise is just silenced. (Automatically) Press the
[SQ.auto
] key over one second. "At” appears
next to “SQ”.
3.3 Adjusting the Dimmer, Contrast
1. Press the [
] key over one second to show the
display for adjustment of dimmer.
R x
S C A N
D i m m e r : 0 3
I N T L S I M P 2 5 W
W a t c h V H F C H 7 0
16
VO L c h a n g e s t o D i m m e r
Display in on hook condition
2. Press [ ] or [ ] to adjust the dimmer within five
seconds.
(00 – 03, four levels).
3. Press the
[
] key again over one second within five
seconds after the dimmer setting to show the
display for adjustment of contrast.
4. Press [ ] or [ ] key to adjust the contrast.
Contrast indication will disappear five seconds later.