Baofeng UV-7B handleiding

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Baofeng

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Handleiding

In two-way radio systems, DTMF is most commonly used for automation systems and remote control. A common example would be in amateur radio

repeaters where some repeaters are activated by sending out a DTMF sequence (usually a simple single-digit sequence).

DTMF frequencies and corresponding codes

1209Hz

1336Hz

1477Hz

1633Hz

697Hz

770Hz

852Hz

941Hz

The radios has a full implementation of DTMF, including the A, B, C and D codes. The numerical keys, as well as the and keys correspond to the

matching DTMF codes. The A, B, C and D codes are located in the

,  ,  and keys respectively.

To send DTMF codes, press the key(s) corresponding to the message you want to send while holding down the PTT key.

In general, there are two forms of selective calling in two-way radio systems: Group call, and Private call.

Group call, as the name suggest, is a one-to-many form of communication. Every radio in your working group is configured the same way and any radio will

make contact with every other radio in the group.

Private call, some times also known as paging, is a one-to-one form of communication.

Every radio is programmed with a unique ID code. And only by sending out a matching code can you get that radio to open up to your transmissions.

6.3 Dual Watch

In certain situations, the ability to monitor two channels at once can be a valuable asset. This can be achieved in one of two ways. You can either have one

receiver in your radio and fli

p-flop between two frequencies at a fixed interval (known as Dual Watch), or you can equip a radio with two receivers (known as

Dual Receive or Dual VFO). The former method is cheaper to implement and far more common than the latter.

The radio features Dual Watch functionality (single receiver) with the ability to lock the transmit frequency to one of the two channels it monitors.

Enabling or disabling Dual Watch mode

(1) Press the

key to enter the main menu.

(2) Enter [4] on the numeric keypad to get to Radio Settings.

(3) Press the

key to confirm, enter 15 on the numeric keypad to get to 15 Dual Watch.

(4) Press the

key to select.

(5) Use the  or  keys to enable or disable.

(6) Press the

key to confirm.

(7) Press

to return to the previous menu.

The dual watch function is turned on, and the icon 'D' is displayed on the top line of the screen.

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