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HX400Page 16
5. CONTROLS AND INDICATORS
5.1 CONTROLS AND SWITCHES
NOTE
This section defines each control of the transceiver. For detailed operating
instructions, refer to section “6. BASIC OPERATION”. Refer to illustra-
tions for the location of the following controls, switches, and connections.
ANT Jack
(
Top Panel
)
The supplied CAT460 flexible an-
tenna is attached here.
MIC/SP Jack
(
Top Panel
)
The jack accepts the optional MH-
73A4B Speaker/Microphone, MH-
57A4B Mini Speaker/Microphone,
VC-24 VOX Headset, or SSM-
55A Earpiece/Microphone. When
this jack is used, the internal
speaker and microphone are dis-
abled.
1) Do not allow the HX400
to become submerged in
water while the plastic cover
over the MIC/SP jack is re-
moved.
2) Do not remove/install the op-
tional Speaker Microphone in a
hazardous location.
POWER Switch / VOLUME Con-
trol
(
VOL
)
Turns the transceiver on and off as well as adjusts the audio volume level.
Turn this knob clockwise to turn the radio on and increase the speakers
audio volume.
Turn fully counter-clockwise to turn the radio off.
Noise Canceling Microphone
The noise canceling microphone is located here.
Note: To cancel background noise when transmitting, care should be taken
not to cover this mic hole with your hand.
16


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