Sigtronics US-12D - Manual (Page 11)

a) Check to see if a radio hand mic on the vehicle is
also active or “live” when transmitting through the
UltraSound unit. Check this while not wearing a head-
set and by talking directly into the radio hand mic and
pressing either UltraSound PTT switches. Do not press
the PTT button on the hand mic itself. If dispatch can
hear you loud and clear, then the background noise
pick up is coming from this active hand mic. If you have
this type of hand mic, then it is best to contact the radio
manufacturer for instructions on a possible microphone
modification to fix the problem. Some radio manufac-
turers can supply a compatible microphone that does
not have this problem.
b) Adjust the UltraSound Radio Mic Transmit Gain controls.
If the mic level is set too low, you will get reports of weak
transmissions. If the mic level is too high, you will get
reports of noisy or garbled transmissions. See “Radio
Mic Transmit Gain Adjustment” on page 9.
Radio 2 Hook Up:
Plug in J3 of the Radio 2 Interface Cable into P3 of the
UltraSound unit. Using the radio manual and Figure 5 on
page 6, connect the six wires to the appropriate connections
on the vehicle’s radio. Once that is done you will need to set
the RADIO 2 VOLUME switch on the back of the UltraSound
unit. See Figure 6 on page 9. For most applications use the
default setting of “LO” (down - which is the reverse of the
Radio 1 switch). If the vehicles radio volume has to be turned
up too high to hear it in the headsets, set this switch to the
“HI” position.
Next, set the Radio 2 Microphone Transmit Gain. The Radio
2 Microphone Transmit Gain Adjustments are the top set
of the two located on the back of the UltraSound unit. The
adjustment procedure is very similar to that of the Radio
1 Mic Transmit Gain adjustment. First set the RADIO 2 MIC
XMIT GAIN RANGE switch to the “LO” position (default set-
ting). NOTE: the HI and LO switch positions for Radio 2 are
upside-down from that of Radio 1. Arrange to have someone
nearby with a radio compatible with your Radio 2. Then, pro-
ceed as follows:
1. Again, plug in a headset into Officer’s jack. Make sure that
the volume control on the headset is turned up to full.
(Radio 1 and the other headsets are not needed for this
adjustment.) Set the RADIO 1/RADIO 2 switch to “RADIO
2” and the AUTO/BOTH switch to “AUTO”.
2. Put on the Officer’s headset and position the headset
microphone as normal. Turn the UltraSound VOLUME
control all the way down (counter-clockwise). You should
not be able to hear yourself in the headset.
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
11
b. a.
FIGURE 7