Lectrosonics SMQ - Manual (Page 10)

SM
Setting Transmitter Operating Frequency
The Operating Frequency of the SM can be displayed
either in MHz or as a two-digit hexadecimal number.
(See
Controls and Functions, FREQ Button.) The SM’s
operating frequency can be set with the unit in Standby
Mode or powered up for normal operation. Use the
following procedure to change the Operating Frequency
of the SM transmitter:
1) If the LCD is displaying something other than the
Frequency Screen, press the FREQ button on the
SM Control Panel to enter this screen.
Note: The default display is in MHz. Pressing the
FREQ button again displays the operating
frequency as a two-digit hexadecimal number that
corresponds the equivalent Lectrosonics
Frequency Switch Setting.
2) While holding the FREQ button, use the Up or
Down arrow buttons to move the operating fre­
quency up or down in 100 kHz increments from the
current setting.
Note: The operating frequency displayed on the
LCD wraps as it reaches the upper or lower end of
its range. Thus, if you intend to move the
operating frequency from the lower end of the
range to the upper end, it may be faster to do this
by using the Down arrow until the frequency wraps
to the upper end.
Most Lectrosonics receivers
indicate the operating
644.400
frequency both in MHz and
as a two digit hexadecimal
Frequency displayed in
MHz number. This conforms to
the Lectrosonics tradition of
setting the operating
CH 2C
frequency using two 16­
position rotary switches.
Frequency displayed as
two-digit hexadecimal The SM offers the ability to
number
set the operating frequency
in a similar manner. Pressing the FREQ button
while the LCD displays the operating frequency in
MHz will change the display to show the equivalent
two-digit hexadecimal frequency select switch
setting. Simply use the Up or Down arrow to
increase or decrease the operating frequency.
Modulation
LCD LEDs Control Panel
UP Arrow
Attaching a Microphone and Adjusting Gain
The front panel Modulation LEDs indicate limiter activity.
(See chart below.) Once set, the transmitter’s audio
level setting
should not be used to control the volume
of your sound system or recorder levels. This gain
adjustment matches the transmitter gain with the
microphone’s output level, the user’s voice level and the
microphone’s position. The audio input level can be set
with the unit in Standby Mode or powered up for normal
operation.
Signal Level -20 LED -10 LED
Less than -20 dB Off Off
-20 dB to -10 dB Green Off
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 db Red Red
Note: Different voices will usually require different
settings of the AUDIO control, so check this
adjustment as each new person uses the system.
If several different people will be using the
transmitter and there is not time to make the
adjustment for each individual, adjust it for the
loudest voice.
1) With the SM powered off, insert the microphone
plug into the Audio Input Jack, aligning the pins and
ensuring that the connector locks.
2) Place the SM in Standby Mode, or if the unit is to be
powered up and adjusted, mute the main sound
system prior to powering up the transmitter.
3) Position the microphone in the location where it will
be used in actual operation.
4) Observe the SM Modulation LEDs while speaking
or singing into the microphone at the same voice
level that will be used during the program. While
holding the AUDIO button, press the Up or Down
arrow buttons until the both the -20 and -10 LEDs
glow green, with the -10 LED occasionally flickering
red (-10 dB to +0 dB Signal Level as shown in the
chart below with only occasional forays into the +0
dB to +10 dB range).
Note: Setting the audio level too high reduces the
dynamic range of if the audio signal. Setting the
audio level too low may cause hiss and noise in
the audio.
5) If the unit was set up in Standby Mode, it will be
necessary to power up the SM and adjust the
remaining components of the audio system prior to
use.
PWR LED AUDIO Button FREQ Button
LECTROSONICS, INC. 10