FCC ID: K6630283X3S
IC ID: 511B-30283X3S
GX5000S / GX5500S Operating Manual
An “RA” Return Authorisation number is not necessary to send a product in for service.
Include a brief note describing the problem along with your name, return address, phone
number, and proof of purchase.
15.3 TROUBLESHOOTING
CHART
16 CHANNEL
ASSIGNMENTS
Tables on the following columns list the VHF Marine Channel assignments for U.S.A. and
International use. Below are listed some data about the charts.
1. VTS. Where indicated, these channels are part of the U.S. Coast Guard’s Vessel
Traffic System.
2. Alpha channel numbers, that is, channel numbers followed by the letter A (such as
Channel 07A) are simplex channels on the U.S.A. or Canadian channel assignments
whose counterparts in the International assignments are duplex channels.
International channels do not use “alpha” numbers. If you call the Coast Guard on
Channel 16, they will sometimes ask you to “go to channel 22 Alpha.” This is a
channel assigned to U.S.A, and Canadian Coast Guards for handling distress and
other calls. If your radio is set for International operation you will go to Channel 22
instead of 22A, and will not be able to communicate with the Coast Guard. To use
Channel 22A, your radio must be set for USA or Canada operation, usually by a U/I/C
(USA/International/Canada) control or combination of controls. Channel 22 (without
an “A”) is an International duplex channel for port operations. Some radios indicate
an “A” adjacent to the alpha channels on the display; on others “alpha” is not
indicated but the proper channel is selected based on the U/I/C setting.
3. Bridge-to-Bridge channels (for example, Channel 13) are for use by bridge operators
on intercoastal waterways and rivers. It is also used by marine vessels in the vicinity
of these bridges for navigation and for communicating with the bridge operators. Note
that a limit of 1 Watt is specified for these channels. See page 28 for additional
information.
4. The S/D column on the chart indicates either S (simplex) or D (duplex). Simplex
means transmitting and receiving on the same frequency. Only one party at a time
can talk, unlike a telephone. Be sure to say “over” and release your microphone
push-to-talk switch at the end of each transmission. Duplex operation involves the
use of one frequency for transmitting and a separate frequency for receiving. On
channels specified as duplex on the charts, correct mode of operation is established
automatically by your radio when you select a channel; you cannot change the mode.
Vertex Standard Co., Ltd.
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