11
Duplex Operation
Duplex operation allows the radio to transmit on a different frequency to that which it receives
allowing operation through repeater stations. Repeaters automatically retransmit your signal over a
wider area providing greatly increased range. Duplex operates only on channels 1-8 & 41-48. When
duplex is selected on these channels, the radio receives on that channel but actually transmits 30
channels higher.
Channel Selecting
1 2 3 4 5* 6 7 8
Receiving Channel
1 2 3 4 5* 6 7 8
Transmitting Channel
31 32 33 34 35* 36 37 38
Channel Selecting
41 42 43 44 45* 46 47 48
Receiving Channel
41 42 43 44 45* 46 47 48
Transmitting Channel
71 72 73 74 75* 76 77 78
* Channel only for Emergency.
ML801 allows you to choose channel duplex operation.
To select Duplex on individual channels
1. Select the required channel (1-8 or 41-48)
Switch the MENU to F4, press menu to confirm, then press or to select which channel to
enable/disable duplex.
Press menu and then press V+ or V- key. The “o” in the channel number will change to “r”
Eg: Channel 2 will be displayed as “02” when in simplex mode but will change to “r2” when duplex
is activated on that channel. Channel 42 will be displayed as “42” when in simplex mode but will
change to “u2” when duplex is activated on that channel.
Note: Channel 1-8 displays “r1-r8” after setting Duplex. Channel 41-48 displays “1r-8r” after
setting duplex.
Widen Frequency for Receiving
If users need wider receiving frequencies, these can be added by an authorised Midland Dealer.
Note: The widened frequency is only for receiving use.
Adjusting the beep tone level
The beep tone is designed to provide audible feedback whenever a key is pressed. If the beep tone
level is too loud or too soft for your operating environment you can adjust it as follows:
1. Switch the MENU to F5, press menu again, then press or to enter choice.
2. A number will flash on the display to indicate the current beep tone level setting.
3. Press or to increase or decrease the beep level. The maximum level is B8 and the minimum
audible level is B1. To turn the beep tone off set the level to B0.
4. To return the radio to normal operation, press MENU key or simply wait 3 seconds.
