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7
UH-4 HANDHELD TRANSMITTER
Transmitters set up
The UH-4 transmitter requires a single 9V battery to operate. To open the battery compartment,
unscrew the
BATTERY COVER (16)
with a counter-clockwise turn and remove the cover, exposing
the
BATTERY HOLDER (17)
. Insert a fresh 9V battery according to the correct polarity as indicated
on the transmitter body. Screw cover back onto the microphone. Make sure the cover is screwed on
completely. Fresh alkaline batteries can last for up to 10 hours of operation, but in order to ensure
optimum performance, it is recommended that the batteries should be replaced after 6-8 hours of
use.
Transmitter
Operation
Transmitter OperationTransmitter
To turn transmitter on, slide the
OFF/STANDBY/ON SWITCH
(18)
to the STANDBY position fi rst
(transmitter on, audio muted) or the ON position (transmitter and audio both on). The
LOW BAT
LED (19)
will give a single fl ash, indicating usable battery strength. In case of dead or low battery,
the LOW BAT LED will either not go on at all or will stay on continuously. During use, if the LOW
BAT LED stays on continuously, it is indicating that the battery should be replaced with a fresh one.
To preserve battery life, turn the transmitter off when not in use.
Receiver Volume Controls Adjust
The Volume Controls adjust only the 1⁄4” sum output level. Turn the
VOLUME CONTROLS (1
0)
on
the UHF-24 receiver clockwise to near full gain. Adjust Volume up or down so that no audio distor-
tion is present when amplifi er or mixer is set at their usual levels. At full gain, the system gain is ap-
proximately +20dB higher than direct line to amp connection. If the
XLR OUTPUTS (11)
are used,
the volume level of each receiver should be adjusted by the mixer to which the UHF-24 receiver is
connected.
Level Trim Adjust
For optimum performance, an
INPUT LEVEL CONTROL (20)
is provided for the transmitter. Adjust
the microphone gain by inserting a small slot-headed screwdriver through the adjustment hole,
located on the topside of the battery compartment, under the compartment cover. Factory setting
is 1⁄2 full. This is a setting to be used in most typical close microphone applications. Depending on
the average distance between vocalist’s mouth and microphone, you can adjust the level for your
application. Set for maximum possible gain and headroom without noticeable distortion of the high
level peaks. It is recommended that the level be set at about 1⁄2 maximum. Experiment and set for
maximum possible gain without audible distortion on the high level peaks.
(Note: Turning down the gain too much can compromise the signal-to-noise and it is not recom-
mended.)
The transmitter is now ready to use. The CH.A or B LED indicator on the corresponding receiver
should now be on, indicating a received signal from the transmitter. When ready to speak, slide the
switch to the ON position. Adjust the volume of the receiver as outlined in the
Receiver Operating
Instructions section: Connecting Audio Outputs
.
Notes:
• The battery compartment on the UH-4 functions as a built-in antenna. For proper operation, it
should not be covered by the hand or touched during operation.
• Observe care in selecting P.A. volume, transmitter location and speaker placement so that acous-
tic feedback (howling or screeching) will be avoided.
10
UB-4 BODYPACK TRANSMITTER
2
8
2
9
30
23
2
2
7
26
Opening Battery Compartment
22
2
1
2
5
2
4
INPUT SELECTOR
SWITCHES
Instrument
HL
G
G
H
L
Headworn
HL
G
G
H
L
Lavalier
HL
G
G
H
L