VXA-300 P
ILOT
III
O
PERATING
M
ANUAL
14
Accessing the 121.5 MHz Emergency Frequency
The
VXA-300
can quickly access the 121.500 MHz Emer-
gency Frequency. This function can be activated even when
the keypad lock function (described on page 19) is in use.
To access the Emer-
gency Frequency, press
the [
121.5
] key momen-
tarily.
To exit the Emergency
Frequency, press down-
ward on the
VOLUME
knob.
Transmission
To transmit, press and hold the
PTT
switch. Speak
into the microphone area
of the front panel grille
in a normal voice level.
To return to the receive
mode, release the
PTT
switch.
B
ASIC
O
PERATION
Operating Advice: Use of Internal Microphone
Your
VXA-300
is extensively sealed against water ingress, so as to ensure reliable opera-
tion even if it has become submerged. This unique construction includes waterproofing
seals around the microphone and speaker enclosure, requiring that care be exercised when
speaking into the internal microphone.
Please refer to the illustration, and observe the location of the internal microphone. It is
important that you focus your speech in the direction of the microphone's location, so as to
ensure sufficient voice input to the radio.
If you find it difficult to utilize the
VXA-300
conveniently and safe while speaking directly
into the microphone, we recommend the use of the
MH-44
B4B
Speaker/Microphone (op-
tion), or an after-market aviation headset/boom microphone.
