Using Your
8
Channels
INT, USA & Canadian Modes
In compliance with worldwide license regulations the following versions of HT644
are available:
Version A: INT, USA & Canadian modes
Version B, C & D: INT mode only
1. In the case of version A only; to change the channel set of the transceiver, hold down the
[WX] key. The mode changes from USA to Canadian to International.
2. Refer to the marine channel charts in this booklet for allocated channels in each mode.
NOAA Weather Channels
(Applicable to version A model only)
1. To receive a weather channel, press the [WX] key. The transceiver enters into weather
channel mode.
2. There are 10 weather channels. Use the & buttons to select the desired channel.
3. To exit from the weather channels press the [WX] key. The transceiver recalls the previous
working channel.
Emergency Channels
To select the emergency channel, press the [16/9] button from any channel. Channel 16 appears
on the display. To recall the previous channel used, press the [16/9] button once again.
Channel 9
Channel 9 is used as a hailing channel for initial, non-emergency contact with other vessels. Hold
down the [16/9] key for 1 second to select channel 9.
To recall the previous channel used, press the [16/9] button twice.
Monitor Channels
Press the blue monitor button on the top of the radio to defeat the squelch mute and release
button to mute radio. A long press (radio will beep) will hold the squelch mute open until
pressed again to cancel again to return to squelch mute.
Adjusting Squelch Threshold
Press & hold the blue monitor button on the top of the radio and switch radio on, then after the
radio emits a beep release the blue button. This will cause the radio to display a number
representing the squelch threshold from 01-16, 01 is the more sensitive & 16 is the less sensitive.
Use the UP & DOWN channel buttons to adjust the level & press MEM to store the
new squelch level.
