HP105/HP405 User manual
Page. 12
enables the speaker. Speaker will remain muted until the correct CTCSS tone or the correct DCS
code is received. In case of unmuted speaker, the message will be heard and the status LED will
glow amber. Units of the same group are not affected by communication on the same channel with
wrong CTCSS/DCS.
"
CTCSS/DCS allows to share more than one radio network in the same frequency, however they
are just useful to avoid disturbing stations not owning of the same network with messages not
related to them. In any case, if more than one station is transmitting at the same time, this will
cause an interference. Don’t transmit if the status LED is glowing. Wait till nobody is
transmitting on the channel.
Monitor
Monitor button can enable / disable “GROUP MODE (CTCSS/DCS)”.
1) To enable GROP MODE. Press
MON
button. A Sub Audible Tone mutes your speaker.
2) To Disable GROUP MODE. Press
MON
button. You are working in “Open Traffic”.
!
NOTE:
if CTCSS/DCS tone is not programmed, GROUP MODE function is not available.
3) Press and Hold MON button: internal squelch is disabled and your speaker in unmuted. Every
environmental noise is heard.
Transmission
When you need to transmit please get used to follow all these steps:
1) Ensure that the channel is not busy (otherwise you will create an interference, please wait till that
condition).
2) Press the
PTT
key: the status LED will glow red.
3) Start talking at a normal voice level at approximately 10 cm from the microphone (keep the
PTT
key
pressed).
4) When your message is over, release the
PTT
!
Don’t shout! It won’t increase the distance range, but rather will make you heard distorted.
!
Don’t release the PTT before your message is over or start talking before pressing it, otherwise
your message will be “chopped”.
!
A handheld radio doesn’t normally allow to talk and receive simultaneously, for this reason make
your messages with a reasonable time. When you are talking the other parties can’t do that, so
don’t occupy too much the channel. Use the common sense.
!
The radio might be programmed with a timeout timer which automatically put your radio in
reception if you talk too much (after a preset time). In this case release the PTT and wait for few
seconds: the radio TX features will be automatically restored. Ask the network responsible or your
dealer for further details.
!
The radio might be programmed with a busy channel lock out which automatically disables
transmission if your channel is busy.
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