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Switching Between 1 W and 25 W Transmitting Modes
You can control the transmitting power of the radio. Low (1 W) is used for local transmissions, and high (25 W)
is used for distance and distress transmissions.
When two signals broadcast on the same frequency, a VHF radio receives only the stronger of the two signals.
You should transmit calls other than distress calls using the lowest power setting that allows you to
communicate, to reduce the possibility that your transmissions interfere with the transmissions of others.
In the USA channel band, transmissions on channels 13, 17, 67, and 77 must be low (1 W) by default.
In the Canadian channel band, transmissions on channels 13, 15, 17, 20, 1066, 67, 75, 76, and 77 must be low
(1 W) by default.
In the International channel band, transmissions on channels 15, 17, 75, and 76 must be low (1 W).
NOTE: In the USA and Canadian channel bands, you can bypass the power setting for these channels
temporarily during transmission (Bypassing the Low Transmission Power Setting, page 8). In the International
channel band, the radio does not permit transmissions on these channels to be changed to high (25 W).
1 Select HI/LO.
2 Select 1W or 25W.
3 Select OK.
Bypassing the Low Transmission Power Setting
In the USA and Canadian frequency bands, transmissions on select channels are required to be low-power (1 W)
by default, because they are intended for intership (bridge-to-bridge) communication (Switching Between 1 W
and 25 W Transmitting Modes, page 8). If other radios cannot receive these channels due to the low power
setting, you can bypass the default restriction during transmission.
NOTE: In the International channel band, the radio does not permit transmissions on these select channels to be
changed to high (25 W).
1 From a USA or Canadian channel set to low power by default, such a 13,17, or 77, hold PTT.
2 While transmitting, select 25W.
Using the Hailer Function
Before you can use the hailer function, you must install a hailer horn (optional). For more information, see the
VHF 315 Series Installation Instructions.
A hailer horn allows you to make on-boat or ship-to-shore announcements, and allows two-way communications
between connected radios. You can address the ship using the radio or handset, and sounds received through
the horn can be heard through the radio speaker. For vessels with enclosed cabins, the hailer horn allows you to
hear sounds from the deck.
NOTE: When the radio is in hailer mode, it does not receive broadcasts from the active channel.
1 Select PA > HAILER.
Sounds received through the horn are heard through the radio speaker.
2 Hold PTT.
3 Select an option:
• To make an announcement, speak into the handset.
• To adjust the volume of the hailer broadcast, turn the ENTER dial.
4 Release PTT to stop broadcasting and listen for broadcasts from other connected radios on the ship.
8 Basic Operation
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