Sigtronics US-DR - Manual (Page 11)

3. With the radio’s hand mic, transmit as normal, to the
remote station. Transmit long enough so that the receiv-
ing station can get “calibrated” to your transmission (voice)
level.
4. Verify Radio 2 reception. If OK, use Officer’s PTT to trans-mit
to your receiving party. If receiving station reports weak
transmission, use the screwdriver to turn the RADIO 2 MIC
XMIT GAIN ADJ clockwise a small amount. If they report
garbled, broken, or noisy transmissions, turn the RADIO 2
MIC XMIT GAIN ADJ counter-clockwise a small amount.
Repeat as necessary until the receiving party reports that
transmissions through the UltraSound sound as good or
better then when using the radio hand micro-phone.
5. If the receiving party reports that your transmissions are
still weak with the MIC XMIT GAIN ADJ at the full clock-
wise position, then switch the RADIO 2 MIC XMIT GAIN
RANGE switch to the “HI” position and repeat steps 3 and
4 above.
If Radio 2 does not operate as it should, use the “Radio Trou-
bleshooting Guide” on page 9 to find and fix the problem. This
completes the UltraSound installation.
HEADSET HOOK INSTRUCTIONS
The enclosed headset hooks are provided at no additional
charge to allow for a convenient way to store the headset.
These strong and durable hooks may be mounted in any loca-
tion. Two mounting methods seem to be preferred:
1. Top Mounting ( Figure 7-a ). The hooks may be mounted
from the existing headliner screws and hardware, or you
may use the enclosed attaching screws. When used with
an electric driver these screws are self drilling. For most
metals such as aluminum or common steel, they will not
require a pilot hole. For some stainless steels however,
1⁄8” pilot holes will need to be drilled. Attach the right
angle mounting bracket to the hooks with the machine
screws and lock nuts.
2. Side Mounting ( Figure 7-b ). The hooks may be mounted
on the side of the cab with the enclosed attaching
screws.
Note: The right angle mounting bracket may be shortened
(one hole removed) by cutting with any standard hack saw.
This completes the UltraSound installation.
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
se
t 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 1/4 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 approximately the 10 o’clock posi-
tion. 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 oper-
ation (VOX), it is helpful to have some background noise
(truck engine or ...). Turn intercom SQUELCH control all the
way counter-clockwise. Now, without speaking, rotate the
SQUELCH control clockwise 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 nec-
essary 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 visa versa.
Transmitting (talking to dispatch) from the selected headset
positions is possible on a one-at-a-time basis. For a typical
UltraSound installation the Driver, Officer, or Crew #4 posi-
tions can transmit at any time simply by pressing their PTT
switch. The other positions cannot transmit on the radios.
11
b. a.
FIGURE 7