Pony Electric Corporation 8TQMT-300 사용자 설명서

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fire, you could not man the radio and fight the fire at the same time. 

DSC calling also helps cut back the transmission traffic on Ch. 16, the 

emergency priority channel. 
How DSC works 
 A digital selective call uses a digital signal to transmit a pack of in-

formation that can include, the caller’s MMSI number, the MMSI of the 

ship or ships being called, call priority and a frequency or mode request. 

Location and time of location may be entered manually or if an active 

GPS unit is attached, transmitted automatically. DSC calls allow you 

to contact a specific ship, a group of ships, a specific group of DSC 

receivers, ships in a particular geographic area or all ships within 

range of you. A DSC call may even be patched into a regular phone line 

through a commercial coastal station. One of the key elements of a DSC 

call is the ability to place an individual call directly to another vessel.  
Simplex or Duplex 
References to simplex and duplex channels are scattered throughout 

this manual. Simplex channels transmit and receive messages on the 

same frequency. Like a CB radio, only one message can be transmitted 

at a time. A duplex channel transmits and receives messages on differ-

ent frequencies. Like a telephone, it gives users the capability to 

transmit and receive messages at the same time. You must choose a 

simplex channel when making a DSC call!  

MMSI (Maritime Mobile Service Identity) 

Your Maritime Mobile Service Identity number (MMSI) is like a home 

phone number. Other DSC (Digital Selective Calling) radios must enter 

your number before they can contact you. But first, you must program 

your number into your radio. If your MMSI number is not set up, the 

 will blink on the display. 

CAUTION 

You only have one chance to program your MMSI into your ra-

dio. Study this section carefully to ensure the MMSI is entered 

correctly.