Sigtronics US-DR - Manual (Page 9)

factures plug in “Y” adapters to make these connections easy.
Contact your Sigtronics dealer for pricing and availability.
For dual radio units (US-45D or US-67D), hook up Radio 1 first
and test before moving on to Radio 2.
Connect the six wires from the Radio 1 Interface Cable to the
appropriate connections on the vehicle’s radio. Once that is
done you will need to set the RADIO 1 VOLUME switch on
the back of the UltraSound unit. See Figure 6 on page 9. This
switch and the vehicles radio volume control set how loud
you hear the vehicles radio in the headsets. For most applica-
tions the default setting of “LO” (up for Radio 1) is fine. 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 (down for
Radio 1). Otherwise leave it in the “LO” position. The switch can
be set with a pen or small flat blade screwdriver.
The last step is to set the Radio 1 Microphone Transmit
Gain. Microphone Transmit Gain (labeled MIC XMIT GAIN)
adjustment for the radio (or both radios for US-45D, US-
67D) is also provided on the back of the UltraSound unit.
The adjustment(s) sets the microphone audio level going to
the radio(s) during transmit. The Microphone Transmit Gain
adjustment(s) will need to be initially set to your particular
radio(s). The gain(s) once set, should never need adjustment
again unless the type of radio(s) used is changed. The follow-
ing simple procedures take you through the adjustment of
the Microphone Transmit Gain(s).
Radio Microphone Transmit Gain Adjustment can be
made with a small, flat blade screwdriver. Referring to Figure
6 above, the gain adjustment is set by two controls - a “HI/LO”
RANGE switch and a rotary “ADJ” control. Set the RADIO 1 MIC
XMIT GAIN RANGE switch to the “LO” position (up for Radio
1). This is the default factory setting. Adjust the “ADJ” control
clockwise to increase the output gain or level to the radio.
Counter-clockwise rotation decreases it. The basic adjustment
concept is simple. You will be setting the level and clarity of
outgoing radio transmissions through the UltraSound unit
headsets, to match or exceed that of transmissions using the
radio’s standard hand microphone. To do this, you will need to
transmit and receive on the vehicle’s radio to a remote station.
Arrange to have someone nearby with a radio compatible to
the radio you are using with the UltraSound. Then . . .
1. Plug a headset into the Officer’s jack. Make sure that the
volume control on the headset is turned up to full. It is not
necessary to connect the other headsets (or Radio 2 on US-
45D / US-67D units) for this adjustment. On dual radio units
(US-45D / US-67D), set RADIO 1/ RADIO 2 switch to “RADIO
1” 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 reception. If OK, use Officer’s PTT to transmit
to your receiving party. If receiving station reports weak
transmission, use the screwdriver to turn the RADIO 1 MIC
XMIT GAIN ADJ clockwise a small amount. If they report
garbled, broken, or noisy transmissions, turn the RADIO 1
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 than when using the radio hand microphone.
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 1 MIC XMIT GAIN RANGE
switch to the “HI” position (down for Radio 1) and repeat
steps 3 and 4 above. That’s all there is to it!
Once the gain is set, also check radio operation with the
vehicles engine running. If radio reception and transmission
through the UltraSound unit are fine, for US-45S / US-67S
units this completes the installation. Skip to the “System
Operation” section on page 11. If everything is OK for US-45D
/ US-67D units, skip to the “Radio 2 Hook Up” section on page
10. If something does not work correctly, check the following
troubleshooting guide:
Radio Troubleshooting Guide:
NOTE: For dual radio units (US-45D / US-67D) it is far easier to
troubleshoot with only one radio connected to the Sigtronics
UltraSound unit at a time.
First determine if the trouble occurs with the vehicle engine
running.
VEHICLE ENGINE OFF:
1. Can’t hear radio in headset:
a) Turn up radio volume at the radio as normal. Make sure
however, you are not picking up the radio through the
headset microphones by briefly turning down (counter-
clockwise) the intercom VOLUME control all the way.
b) Check violet wire (SPEAKER HI and LO) connections from
the UltraSound to the radio.
c) Set the appropriate RADIO VOLUME switch on the back
of the UltraSound unit to the “HI” position.
9
RADIO VOLUME switch for Radio 2*
MIC XMIT GAIN RANGE switch for Radio 2*
MIC XMIT GAIN ADJ for Radio 2*
MIC XMIT GAIN ADJ for Radio 1
MIC XMIT GAIN RANGE switch for Radio 1
RADIO VOLUME switch for Radio 1
RADIO
VOLUME LO
HI
RADIO 2
RADIO 1
HI
LO
MIC
XMIT
RANGE
MIC XMIT
GAIN ADJ
*
*On Dual Radio units only. Models US-45D and US-67D.
FIGURE 6