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Ut-12S
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SYSTEM OPERATION
The following describes how to use the UltraSound System as well
as adjust the UltraSound controls. It also explains exactly how the
UltraSound unit operates. This will allow you to easily set all unit
functions to your specific needs. If you are not familiar with the
UltraSound operation, perform the next few steps while the vehicle
is not in motion.
Headsets
Put on the headset(s) and position the boom mike close to the mouth,
as is the practice with a hand-held mike. For best voice clarity, the
headset microphone must be positioned to one side of the mouth
and ¼ inch from the lips. Turn the volume control on the headset
ear cup to maximum. Turn down for individual hearing needs if
necessary only after intercom and radio volumes have been set
correctly. (see below)
Intercom operation and adjustment can be performed by the
following procedure:
1. Turn the intercom SQUELCH control to the maximum clockwise
position. For best system performance set the intercom VOLUME
control as low as possible. On most systems this will be approxi-
mately the 10 o’clock position. NOTE: the intercom volume control
only adjusts the volume of conversation between the headsets
inside the vehicle. It does not affect the level at which you hear
the dispatch radio. See “Radio Operation” below. You should
now hear yourself and others on the intercom.
2. To adjust the Intercom SQUELCH for voice activated operation
(VOX), it is helpful to have some background noise (truck engine
or…). Turn intercom SQUELCH control all the way counter-clock-
wise. Now, without speaking, rotate the SQUELCH control clock-
wise until you hear the background noise in your headset. Next,
rotate it counter-clockwise in small amounts until the background
noise disappears. Finally, make small adjustments until your voice
triggers the unit at comfortable speaking levels. This procedure
is necessary because the squelch is a “Fast-on, Slow-off” system.
When you speak, your voice will be heard in the headsets but the
sound will cut off about a second after you stop speaking. Minor
readjustment of the squelch may be necessary if the background
noise level changes significantly (engine idling to cruise power
with siren on).
Radio Operation
With the UltraSound System, your radio(s) are heard through the
headsets as well. Adjust the volume level of the dispatch radio(s)
in the headsets with the volume control on the radio as normal.
NOTE that the radio volume does not effect the intercom volume
and vise versa.
Transmitting (talking to dispatch) from the selected headset posi-
tions is possible on a one-at-a-time basis. For a typical UltraSound
installation the Driver, Passenger, Crew #1, or Crew #2 positions
can transmit at any time simply by pressing their PTT switch. The
other positions cannot transmit on the radios. When one position
transmits, several things take place automatically:
— All headset microphones, except for the transmitting position,
are muted.
— The selected radio is put into transmit mode.
— The headset microphone audio (your voice) is sent to the
selected radio.
— Sidetone is generated and sent to your headphones.*
* Sidetone is a portion of the transmitted voice signal sent back
into your headset so that you can hear what you are saying while
transmitting. The intercom VOLUME control adjusts the volume
level of the sidetone that you hear in your headset. The other
headsets will also hear the transmission sidetone. Of course, when
the PTT switch is released, (stop transmitting) all functions return
to normal, instantly and automatically.
For Dual Radio Units - UT-12D:
The operation of the dual radio UltraSound units are identical to that
of the single radio units except for the addition of radio selection:
Radio Selection of both Radio 1 and Radio 2 radios are provided
by two switches.
1.
RADIO 1/RADIO 2 (TALK) determines the radio you wish to
transmit on.
2.
AUTO/BOTH (LISTEN) selects which radio(s) you receive or hear
in your headset.
a)
“AUTO” position allows you to hear the radio that the RADIO
1/RADIO 2 switch is set to.
b) “BOTH” position permits you to hear both the radios at the
same time.