Uniden UM415 English Owners Manual - Page 17

Making a voice MAYDAY call (see inside front cover) Setting the volume Turn the volume knob clockwise to increase the speaker volume; turn it counter-clockwise to decrease the volume. Setting the squelch level The squelch feature reduces the level of static on the speaker by filtering out the background channel noise. At the lowest squelch level, the speaker plays all radio signals, including any noise on the channel. Setting the squelch level higher filters out channel noise and lets only actual radio transmissions through. Strong signals Weak signals Noise No Squelch Medium Squelch High Squelch While listening to a channel, adjust the SQUELCH knob until the noise is filtered out and you can only hear the transmission. If you switch to a channel with a lot of noise or with a weak transmission, you may need to adjust the squelch level again. NOTE: Setting the squelch level too high may prevent you from hearing weaker transmissions. If you are having difficulty hearing a transmission, try setting the squelch level lower. Changing the channel Press CHANNEL UP and CHANNEL DOWN briefly to scroll through the channels one channel at a time. Press and hold CHANNEL UP or CHANNEL DOWN to quickly scroll through the channels. Making a transmission To make a transmission, press and hold the microphone PUSH TO TALK button. Release the PUSH TO TALK button when you're finished talking to let the other party respond.  To prevent stuck microphone problems or situations where PUSH TO TALK is pushed accidentally, the radio limits your talk time to 5 minutes in a single transmission. If you talk for over 5 minutes continuously, the display shows RELEASE MIC BUTTON.  For the best sound quality, hold the microphone about two inches away from your mouth.  You cannot transmit while the radio is in weather mode or scan mode.  See the channel lists beginning on page 40 for a list of receive-only channels. English 17