Midland Radio 75-440 사용자 설명서
75-440 User manual
Page. 14
2) To Disable “GROUP MODE”. Press the “MON” button: “SAT” icon is not displayed. You are now
working in “Open Traffic”.
NOTE: if “SAT” icon is never displayed, “CTCSS/DCS” tone is not programmed. “GROUP
MODE” function is not available. See ‘Setting “Group Mode” codes’.
3) Press and Hold “MON” button for three seconds, internal squelch will be disabled and your speaker is
un-muted. Press and release the “MON” button to restore the squelch to normal operating condition.
Transmitting
1) Ensure that the channel is not busy otherwise you will create interference.
2) Press
the
“PTT” button, the status LED will glow red.
3) Start talking at a normal voice level at approximately 2.5 inches from the microphone (keep the
“PTT” button pressed).
4) When you have finished talking, release the “PTT” button.
Do not shout! It will not increase the distance you can transmit, but rather will make you heard
distorted.
Do not release the “PTT” button before your message is over or start talking before pressing
“PTT”, otherwise your message will be “chopped”.
A GMRS handheld radio does not normally allow you to talk and receive simultaneously, for this
reason make your messages short. When you are talking the other parties can not use the channel!
Use common sense.
Use common sense.
Your radio is programmed with a timeout timer which will automatically turn off the transmitter if
you talk longer than 90 seconds. In this case release the “PTT” and wait for few seconds, the radio
TX features will be automatically restored.
TX features will be automatically restored.
Adjusting Transmit Power
Your 75-440 can transmit with two power levels according to the distance of your party’s station(s). We do
recommend, when possible, to use the Low power setting. This will increase the battery life and will
reduce the risk of interference with other stations not in your radio network that may be sharing the same
channel with you.
recommend, when possible, to use the Low power setting. This will increase the battery life and will
reduce the risk of interference with other stations not in your radio network that may be sharing the same
channel with you.
1) To change the channel's Power Output level from high (2 Watts) to Low (0.5 Watt), or vice versa,
Press and Hold “FUNC” key for about 2 seconds. A small "LOW" will appear in the lower left corner
of the display to indicate “Low Power”. High Power has no indicator.
of the display to indicate “Low Power”. High Power has no indicator.
If the battery icon is "blinking" (Low Battery indication), the Unit will automatically switch to Low
Power when transmitting in order to help prolong the Battery's operational life. In this case, two
short beeps will be heard when you press the “PTT” key before the radio transmits.
short beeps will be heard when you press the “PTT” key before the radio transmits.