JRC JHS-770S Operation Manual page 2

1. Calling and communicating with the radiotelephone
Before operating below, previously adjust the squelch and volume controls to adequate positions.
Making a radiotelephone call
1 1 . .
1 .
Select CH16 or another agreed channel.
2 2 . .
2 .
Lift the handset from the cradle, then press the PTT key and make a call as described below.
Say the calling station name ... Repeat 3 times.

"this is"

Say own ship's name ... Repeat 3 times.

"over"

3 3 . .
3 .
Release the PTT key to listen.
4 4 . .
4 .
When answered and agree on a working channel, change to that channel.
5 5 . .
5 .
After checking that no station uses the working channel, begin conversation.
6 6 . .
6 .
When terminating communications, say "out".
Receiving a call on CH16
1 1 . .
1 .
Lift the handset from the cradle, then press the PTT key and respond to the call as described below.
Say the caller station name.

"this is"

 Say own ship's name.
"channel"

Working channel number

"over"

2 2 . .
2 .
Release the PTT key, wait a moment, and then switch to the proposed working channel.
3 3 . .
3 .
After checking that no station uses the working channel, begin conversation.
4 4 . .
4 .
When terminating communications, say "out".
2. Using the feature of the radiotelephone
If required to input the information to perform the feature, move the cursor to the item and press ENT.
● Dual watch FUNC
： 
● All CH scan FUNC 
：
● Memory CH scan FUNC
： 
● Select CH scan FUNC

：
● Setting a memory channel FUNC
： 
● Setting a private channel MENU 
：
● Setting a weather channel MENU
： 
● Changing a channel region MENU 
：
● Setting a preset squelch FUNC +
：
● Channel monitor CANCEL
：
- 2 -
1 (Note: Previously set a channel other than CH16.)
2  1
2 2

2 3  Enter the channel coverage (from/To)  Execute

3  Enter two digits of the memory channel.
7  4  Enter three digits of the private channel.  ENT
7 5  Enter one digit of the weather channel.

7  6  Selection from 1.ITU/2.USA/3.Canada/4.IWW.
CANCEL  SQL adjustment  [REG]
(Note: Available only on the status display.)
3. Making a non-distress call via the DSC
When inputting information to call, move the cursor to the item and press ENT. Additionally when entering a work
channel, the equipment would normally suggest it, but also enables to change it manually.
● A routine individual call DSC  Enter the receiver ID  Call
：
RTN
● A routine group call MENU
： 
● Semi/auto (PSTN) call MENU

：
 Enter the TEL number  Call
● A safety call to all ships MENU
： 
● A safety call to an individual station MENU
： 
● An urgency call to all ships MENU 
：
● An urgency call to an individual station ： MENU

● An individual call from the AIS information ： FUNC

 After that, follow the menu display.
4. Making a distress alert via the DSC
When in distress, make use of the dedicated red DISTRESS
CAUTION
● DO NOT test the distress alert.
● When sending the distress alert, follow the instructions of the captain or the officer in charge.
● If a false distress alert is transmitted accidentally, select the Cancel menu and transmit the
distress cancel referring the guidance displayed on the controller. And then report the false
distress alert to a nearby RCC (Rescue Coordination Center/ in Japan, inform the nearest
Japan Coast Guard.)
Information to be reported:
Ship's name, type, nationality, and ID number, the date/time, location and reason why
the false distress alert was transmitted. Also the unit model name and manufacture
number/date, if possible.
● Quick distress alert ：To send the distress alert quickly, press
After receiving the acknowledgement, lift the handset and follow this procedure.
"MAYDAY"/ "this is"/ the own ship's ID (MMSI)/ ship's position/ the nature of
distress/ a rescue request and any other useful information
● Distress alert after editing ：If time permits, send the distress alert after editing the message as follows:
While pressing and holding
distress msg menu and enter the nature and/or the position and the time manually.
Then, without closing that menu, press
(The subsequent procedure is as with mentioned above.)
5. Silencing a receiving alarm of the distress/urgency DSC message
When receiving a distress or an urgency call, the receiving alarm will continue to sound unless silenced manually.
To silence the alarm, press CANCEL key. After that, handle the message according to that content.
6. Maintenance
● Self diagnosis of the transceiver FUNC
： 
● Self diagnosis of the controller FUNC

：
● Checking the "loop test" only MENU
： 
● A safety test call MENU
： 
1  Select RTN/Group/Rt  Enter the group ID  Call
1  Select RTN/PSTN/Rt  Enter the coast station ID
1  Select SAF/All/Rt  Call
1  Select SAF/Indv/Rt  Enter the receiver ID  Call
1  Select URG/All/Rt  Call
1  Select URG/Indv/Rt  Enter the receiver ID  Call
0  Select a station from Other ships list.  Select the category.
key to send a distress alert.
DISTRESS key for 4 seconds.
MENU key, press 3 key to open 3. Editing a
MEM
CALL
DISTRESS key for 4 seconds.
8 1  Select a test type and press ENT.

8 2  Select a test type and press ENT.

8 1 5  Press ENT.
 
1  Select SAF/Indv/Test  Enter the receiver ID  Call
- 3 -