Frequency Scan; Loop Applications - Shure PSM 900 User Manual

Frequency Scan

The scan feature analyzes the RF environment for interference to identify
available frequencies. The PSM900 has two frequency scan modes:
• Channel Scan Press the scan button on the bodypack. Finds the first
available channel.
• Group Scan Press and hold the scan button for two seconds. Finds
the group with the greatest number of available channels. (Each group
contains a set of frequencies that are compatible when operating multiple
systems in the same environment.)
Sync
The PSM900 transfers settings in either direction: from the bodypack to the
rack unit, or from the rack unit to the bodypack.
• Sending settings to the bodypack: Align the IR windows and press the
sync button on the rack unit. The blue LED on the bodypack flashes.
• Downloading settings from the bodypack: First press the scan button
on the bodypack. Then align the IR windows and press the sync button
on the rack unit while the bodypack display is flashing "SYNC NOW...".
The level LEDs flash on the rack unit.
MixMode
Some performers need to hear more of their own voice or instrument, while
others want to hear more of the band. With MixMode, the performer creates
their own mix using the balance control (▼▲ buttons) on the bodypack.
To use MixMode, send a solo mix of the performer to the CH. 1 IN input on
the transmitter, and send a band mix to the CH. 2 IN input.
Set the performer's bodypack for MixMode. The bodypack combines the two
signals and sends them to both earphones, while the balance control on the
bodypack adjusts the relative levels for each.

LOOP Applications

Use LOOP OUT L (left) and R (right) outputs to send a copy of the audio
signal going into the transmitter to other devices. Following are a few of the
many applications for these outputs.
Note: The input level control and the input pad do not affect the LOOP
OUT signals.
Stereo for Multiple Systems
Send one stereo signal from the mixing console to the inputs on the first
transmitter, then connect the LOOP outputs to the inputs on the next trans-
mitter. Repeat for all transmitters to form a chain.
Floor Monitors
Send the audio from the LOOP outputs to onstage loudspeakers. The
bodypack and the onstage monitors receive the same audio signals.
Recording Devices
To record a performance, connect the LOOP outputs to the inputs of a re-
cording device.
6
Squelch
Squelch mutes audio output from the bodypack when the RF signal be-
come noisy. While squelch is activated, the blue LED on the bodypack
turns off.
For most installations, squelch does not need adjustment, and it keeps the
performer from hearing hiss or noise bursts if the RF signal becomes com-
promised. However, in congested RF environments or in close proximity to
sources of RF interference (such as large LED video panels), the squelch
may need to be lowered to prevent excessive audio dropouts. With lower
squelch settings, the performer may hear more noise or hiss, but will experi-
ence fewer audio dropouts.
Note: Before lowering squelch, first try to eliminate the problem by find-
ing the best set of frequencies for your installation and removing potential
sources of interference.
Caution: Turning off or lowering the squelch setting can increase the noise
level and cause discomfort to the performer:
• Do not lower the squelch setting unless absolutely necessary.
• Turn earphone volume to the lowest setting before adjusting squelch.
• Do not change the squelch setting during a performance.
• Turn up the transmitter setting to make noise or hiss less noticeable.
Squelch Settings
HIGH (NORMAL)
Default factory setting.
MID
Moderately decreases the signal-to-noise ratio
required to squelch the receiver.
LOW
Greatly decreases the noise squelch threshold.
PILOT ONLY
Turns off noise squelch leaving only pilot
squelch on.
Symbol appears in display window
NO SQUELCH
Turns off noise and pilot tone squelch. (Sometimes
used as a debugging tool by monitor engineers or
RF coordinators to "listen" to the RF environment.)
Symbol appears in display window
Point-to-Point Wireless Audio
When a cable cannot be used, a UR4 receiver and a P9T transmitter can
be used for point-to-point (PTP) wireless audio.
UR4S
Wireless Receiver
with Audio Reference Conpanding
sync
For more information on PTP, please visit:
www.shure.com/americas/products/personal-monitor-systems/psm900
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