Bedienungsanleitung Midland Alan HP450 2A Rugged (Seite 14 von 26) (Englisch)

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2Only one user at a time can talk during radio communications.

Therefore, it is important not to transmit when you are receiving a

communication and use the transmission mode sparingly to allow

other users to use the feature.

2Transmission consumes a signicant amount of energy and

should therefore be used sparingly to prolong the battery life.

Alternatively, it is also possible to select a low transmission

power.

2 If you are unable to contact a station that you have no problems in

receiving, the station may be using CTCSS tones or DCS codes

(O 5.8).

5.7 Busy channel lockout

The BCLO and TOT functions are disabled by default.

If BCLO has been enabled and the channel is busy, the selection of

PTT or CALL will have no effect and the radio will issue an error beep.

As soon as the channel is free, PTT and CALL shall automatically

resume ordinary operation.

5.7.a Transmission timer (TOT)

The HP450 2A radio can be programmed with a transmission timer

that temporarily blocks transmission if the radio has been used

beyond the maximum time permitted.

The radio is forced in reception mode if it continues transmitting

after the preset timer threshold has been reached. To restart the

transmission, it is sufcient to release and then press again the

PTT.

5.8 Operating modes (open or restricted traffic)

HP450 2A can be used in two modes:

Mode name: Default

setting

Comments

Opentrafc

(without CTCSS/

DCS)

From channel

1 to 8

Guarantees maximum

compatibility with the devices of

other manufacturers. However, if

the channel you are using is used

also by other parties, you will also

receive their communications.

Restrictedtrafc

(with CTCSS/

DCS)

From channel 9

onwards (with

several CTCSS

tones or DCS

codes)

CTCSS and DCS tones are

similar to access codes and

enable the radio to communicate

only with the parties that use the

same frequency or have set the

same code.

2For information on how to change the CTCSS tone or DCS code

of a channel programmed in restricted trafc mode, see O 5.9.

2The restricted trafc mode enables several radios to use the same

radio frequency. However, if several parties (for example a user

of group A and a user of group B) simultaneously use the same

channel for transmission purposes, interference may occur. For

this reason, it is advisable not to transmit if the radio signals that

the channel is busy although there are no communications.

2The restricted trafc mode does not guarantee the privacy of

communications. In this mode it in fact possible to listen also

to parties that use CTCSS tones/DCS codes, although it is not

possible to call them because they would not be able to receive the

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