E F Johnson Company 2425770 사용자 설명서

2-2 

Viking Portable 600 Radio Operating Manual

Microphone - The microphone is located behind the small opening shown in Figure 2.1. 
For best results, hold the radio 2-3 inches from you mouth and speak at a normal 
conversational level. Do not shout since it distorts your voice and does not increase range. 
Make sure that the PTT (push-to-talk) switch is pressed before you begin to speak and 
released as soon as the message is complete.

Display - This is a graphical LCD (Liquid Crystal Display). The display backlight can be 
programmed to turn on when any key/button is pressed (or pressed and held, depending 
upon programming), or when the Backlight option button is pressed or menu parameter 
selected (see Section 3.5, "Backlight"). 

Up/Down Buttons- Select zones when multiple zones are programmed (see Section 3.3, 
"Zone and Channel Select"). Pressing the up button selects the next higher number and 
pressing the down button selects the next lower number. These buttons also provide up/
down select in the menu mode and in other modes when up/down select is required. 

<F1> - In menu mode (see Section 4.4, "Menu Mode"), functions as a step back and exit 
button. If menu mode is not used, it is a programmable option button.

<F2> - Selects the menu mode when that mode is enabled by programming. Also 
functions as an Enter or Select button in the menu and other modes. If menu mode is not 
used, it is a programmable option button. 

<F3>, <F4> - Programmable option buttons. Function Button and Clear/Cancel <F3> 
exit the feature without saving. Menu/Select (F4) exits the feature and saves changes.

DTMF Keypad - The full keypad DTMF models include the 12 keys required to dial 
telephone and unit ID numbers.

Speaker - The radio speaker is located near the bottom of the front panel. When a speaker/
microphone is used, it is automatically detected when the Opt Sel 1 line of the accessory 
connector is pulled low. The logic then automatically disables the internal speaker.