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2. Dispatch says too much background noise or unclear or weak
transmissions.
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 headset 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 manufacturers
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”.
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, 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. 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 setting). 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, proceed 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 receiving station can
get “calibrated” to your transmission (voice) level.
4. Verify Radio 2 reception. If OK, use Officer’s PTT to transmit to
your receiving party. If receiving station reports weak transmis-
sion, 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 clockwise 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 Trouble-
shooting Guide” 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 location. 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 inch 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.
b.
a.
FIGURE 7
