UHF WIRELESS MICROPHONE
OPERATION MANUAL
UHF WIRELESS MICROPHONE
OPERATION MANUAL
UHF-438
UHF WIRELESS MICROPHONE
OPERATION MANUAL
1
Precautions
Hand-held microphone
Receiver unit/operation
Installation
Trouble shooting
Specifications
2
Unscrew the battery cover at the end of microphone, put a 9V battery into compartment with
correct polarities, then close the cover. Pushing "ON/OFF" switch to "ON" position, "PWR"
indicator comes on blue. If it doesn't come on, please check the voltage of battery or
polarities. If it gets dim bit by bit, then "LOW" indicator becomes red in using, this indicates
battery is dead, please replace by another new one. Pushing "MUTE" switch to downside,
audio will be cut down, noises are prohibited to come across receiver. To use microphone,
please push "MUTE" switch to upside. Please confirm frequency of transmitter same as that
of receiver before operation.
3
Note that switching the microphone on and off can cause interference
that will be heard if the microphone volume level of the amplifier system
is still set high.
Switching on wireless microphone receiver, power indicator will
illuminate to show it's under normal working. "RF-A" & "RF-B" will shine
to show signals are strong or not when microphone is working. Now this
wireless microphone system is ready to use, adjusting volume of amp-
lifier/receiver as requested. Please don't forget to switch off microphone
if wireless microphone system is not being used.
SQUELCH
The squelch control on the rear of the receiver is preset well at the
factory, if you must use the system in an area with considerable RF
interference and there is some noises from the receiver when your
transmitter is off, you can adjust the squelch control, so the system will
receive the signal from your transmitter only but squelch or eliminate the
unwanted background RF noise. This adjustment can cause reduction in
useable range of the wireless transmitter, so set the control to the lowest
position that reliablely mutes the unwanted RF signals.
MIXER
BALANCED
LINE
MIC
SQUELCH
A
B
UHF Wireless Microphone Receiver
UHF-438
UHF DUAL WIRELESS MICROPHONE
POWER
RF-A RF-B
VOLUME
MIN
MAX
VOLUME
MIN
MAX
AERIAL.B
AERIAL.A
AUDIO OUTPUT SELECTOR DC POWER IN
BALANCED
OUTPUT JACK
UNBALANCED
OUTPUT JACK
4
Using the supplied screened jack-to-jack lead, connect from the MIXER jack socket to the
"MIC IN" / "LINE IN"socket on amplifier. Another way, using optional lead of balanced output, connect
from "BALANCED" socket on receiver to professional mixer. Plug the mains power adaptor
from "DC 12V" jack to a suitable mains power socket.
Attention in installation
1.5m higher than ground
1.5m distance from wall
MIXER
BALANCED
LINE
MIC
SQUELCH
A
B
UHF Wireless Microphone Receiver
Professional mixer
MIC LINE MIC LINE MIC LINE MIC LINE MIC LINE
5
6
A.Overall system
Oscillation mode: Quartz controlled
Carrier Frequency Range: UHF 700MHz~870MHz
Stability: 0.005%
Max Deviation: 56KHz
Dynamic Range: >110dB
S/N >100dB
T.H.D: <0.5%
Squelch: "Pilotone & Noise lock" dual squelch circuit
Frequency Response: 60Hz~18KHz
Operating range: 100 meters, depending on obstacles
B. Receiver
Sensitivity: 6dB V at S/N>20dB
Image Rejection: >60dB
Audio output: -12db/600ohms unbalanced and balanced
Power supply: 12V-15VDC/0.5A
Dimensions(m/m): 195 152 40
Weights: 1 kg approx
C. Transmitter
Mike capsule: Dynamic microphone
Antenna: Built-in housing
RF output power: <10mW
Spurious emission: >60dB
Battery: one 9V battery
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