Operator's Manual

OM-E 2072-09689-00
2-12
2-5.2 Transmitting and Receiving
NOTES
• When transmitting, the RF output of the radio must be connected
to an antenna installed as explained in the Installation chapter (for
maintenance, you may also connect to a dummy load of suitable
power rating). Do not attempt to transmit when the antenna is not
connected, or when the antenna or any cable leading to it is
physically damaged.
• If the antenna system is equipped with an automatic antenna tuner
and the tuner is enabled, the radio will automatically tune the
antenna tuner. In the Channel mode, pressing the ENTER key
automatically retunes the antenna.
To transmit a voice message:
Press and hold down the Push-to-Talk (PTT) button of the microphone, and speak slowly and clearly
after the channel is clear.
You should hear a sidetone, which verifies that your radio transmits normally.
The display changes to show the TX bar, together with indications of
forward and reflected power.
During normal speech, these indications fluctuate in accordance with
your voice.
Tx Bar
Forward
Power
Reflected
Power
To receive calls:
When the radio identifies a call addressed to it, it sounds a beep and if
it is a voice message – you start hearing it in the speaker. The display
shows the name of the calling station (blinking) and the call type. The
display now shows the RX indication, which is proportional to the
received signal strength.
Strong received signal
Weak received signal
2-5.3 Radio Filter Bandwidth and Service Type
The radio filter bandwidth must be selected in accordance with the type of signal to be transmitted and
received. For the transmit mode, the type of signal is identified by detecting the active PTT signal,
which is one of the following:
• MIC PTT – PTT from the microphone connected to the front panel connector; transmits your
voice.
• Voice PTT – PTT from an accessory connected to the radio set through its rear panel
ACCESSORY connector; it causes the radio to transmit the voice signal provided by the
accessory device.
• Data PTT – PTT from a data device, for example, a modem, connected to the radio set through
its rear panel ACCESSORY connector; it causes the radio to switch to the data mode and
transmit the modem signal.
• CW PTT – PTT from a Morse key connected to the radio set through its rear panel
ACCESSORY connector; it causes the radio to switch to the CW (Morse) transmission mode.
The radio operating mode is automatically adapted for best performance with the signal expected for
the detected PTT type.
A default filter bandwidth can be configured for each channel using MENU > MORE > PROG >
RAD > CHAN (if no particular filter is set for the current channel, the radio retains the previously
used filter). When a new type of call is received or sent, the bandwidth filter changes automatically,
depending on the PTT source (voice, data or CW), and the programmed bandwidth for the channel
being used.