Chiayo SDR-1900 User manual

Operation manual
CHIAYO ELECTRONICS CO.,LTD.
SDR-1900
UHF Dual-Channel 2-Way Sync Receiver
SDR-1900

1
SDR-1900 UHF Dual-Channel 2-Way Sync Receiver
Thank you for choosing this wireless microphone system! For more details, please take a few
moments to read this operating manual to have a thorough understanding of the function and
operation of both transmitter and receiver.
In the box
SDR-1900 receiver
two transmitters
(handheld/beltpack)
a pair of antennas
audio cable
switching adaptor
operation manual
** Remark: The above specifications are subject to change without prior notice.
Important
1.Please make sure that the output DC voltage range of the switching power covers that
specified by the receiver before turning it on.
2.The antenna diversity indicator will flash to denote RF signal received after turning on the
transmitter.
3.The receiver and transmitter must be the same frequency.
4.While speaking to the transmitter, the audio indicator will flash to denote audio signal received.
SDR-1900

2
Instructions
Parts and functions
Front panel
Rear panel
1.Power switch
2.RF diversity indicator
3.AF indicator
4.7-segment channel display
5.Channel scan button
6.IrDA synchronizing area
7.IrDA synchronizing button
8.Volume control
9.RF diversity indicator
10.AF indicator
11.7-segment channel display
12.Channel scan button
13.IrDA synchronizing area
14.IrDA synchronizing button
15.Volume control
16.Antenna B (TNC socket)
17.CH2 balanced audio output
18.CH2 squelch control. Clockwise to increase level.
19.Mix audio output
20.Mic /Line level switch of mixed audio output
21.CH1 balanced audio output
22.CH1 squelch control. Clockwise to increase level.
23.DC input
24.Antenna A (TNC socket)
Channel scanning
In situations with heavy wireless microphone use or other wireless equipment you
may experience interference. The scan function will automatically find a cleaner
channel. To perform the scan function, the transmitter must first be switched off.
Press and hold a channel button [ channel 1:⑤,channel2:○
12 ] for 3 seconds and
the receiver will auto scan UPwards (▲) or DOWNwards (▼) and stop at the next
clean one. Then you turn on the transmitter and use the sync function set the
channel accordingly.
Volume adjusting
Volume level can be adjusted by rotating the designated volume knob [ channel 1:
⑧,channel2:○
15 ]. Clockwise to increase the volume and counterclockwise to
decrease the volume.
DIVERSITY
A B AUDIO
CHANNEL SYNC MAXMIN
DIVERSITY
A B AUDIO
CHANNEL SYNC MAXMIN PLLDIVERSITY RECEIVER
SDR-1900
12 7
3
4
9
8
5
6
10 12
13
14
15
11
16 17 18
19 24
23
20
22
21
CHANNEL 1
CHANNEL 2
CHANNEL 2

3
SDR-1900 UHF Dual-Channel 2-Way Sync Receiver
Channel synchronizing between receiver and transmitter
Align infrared areas of the receiver and transmitter within 10~30cm.
Changing the receiver’s channel
1 Press the synchronizing button of the
transmitter.
2 The transmitter's LED will grow to denote
synchronizing signal transmitted.
3 The channel/frequency of the receiver will
change and then the synchronization is
complete.
Changing the transmitter’s channel
1 Press the synchronizing button of the
receiver
2 The transmitter's LED will grow to denote
synchronizing signal received.
3 The channel/frequency of the transmitter
will change and then the synchronization is
complete.
If it doesn’t work check that you have the IR sensor panels aligned, that they are facing each
other, devices are within 10~30cm of each other, and try again.
Squelch (SQ) setting
When interference is encountered try reducing the sensitivity of the receiver by turning the SQ
control [channel 1:○22 ,channel 2:○18 ] clockwise, thus less susceptible to interference. If this still
does not solve the problem it means this frequency is not suitable. Adjust the squelch back to
where it was and use the scan function to locate a clear channel.
10~30cm

4
Instructions
Audio output connection
Balanced output
XLR connector provides balanced audio output signal from this jack to the mixer/amplifier.
Use an audio output cable with “XLR” or “Cannon” connector, connect one end to the
balanced output jack of the receiver, and the other end to the “MIC IN” jack of the mixer/
amplifier.
Unbalanced mixed output
¼” PHONE PLUG connector provides unbalanced audio output signal from this jack to the
mixer/amplifier. Use an audio output cable with ¼ ” PHONE PLUG connectors. Connect one
end from the unbalanced output jack of the receiver, and the other end to the “LINE IN” or
“MIC IN”jack of the mixer/ amplifier.
MIC-LINE level switch setting
When connecting to the LINE /AUX IN of a mixer/amplifier, switch to “LINE” position. DO NOT
use the “MIC” position as they may not deliver a sufficient high output level. When connecting
to the “MIC IN” jack of a mixer/amplifier, switch to “MIC” position. Overload distortion may
occur at the wrong level position.
MIC level for connecting to MIC IN.
LINE level for connecting to LINE IN or AUX IN.

5
SDR-1900 UHF Dual-Channel 2-Way Sync Receiver
Receiver installation
For best operation, the receiver should be at least 1m above the ground and 1m away from a
wall or metal surface to minimize reflections. The transmitter should also be at least 1m away
from a wall or metal surface to minimize reflections. The transmitter should also be at least 1m
away from the receiver. Keep antennas away from noise source such as motors, automobiles,
neon light as well as large metal objects.
1m 1m
1m

6
Instructions

CHIAYO ELECTRONICS CO.,LTD.
Http://www.chiayo.com.tw｜Email: [e-mail]
Office: 30, Lane 27, Section 4, Jen-Ai Road, Taipei 10685, Taiwan
Tel: [phone]｜Fax: [phone]
Factory: 88, Chung-Hsiao Street 2, Chiayi 60080, Taiwan
Tel: [phone]｜Fax: [phone]