Lectrosonics SMa User Manual download pdf (Page 10)

SMa Series

Setting Transmitter

Operating Frequency

Frequency displayed

The Operating Frequency of the

in MHz

SM can be displayed either in

MHz or as a two-digit hexadeci-

mal number. (See Controls and

Functions, FREQ Button.) The

Frequency displayed as

SM’s operating frequency can

two-digit hexadecimal

be set with the unit in Standby

number

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

frequency both in MHz and as a two digit hexa-

decimal number. This conforms to the Lectrosonics

tradition of setting the operating frequency using

two 16-position rotary switches. The SM Series

units offer the ability to 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 set-

ting. Simply use the UP or DOWN arrow to increase

or decrease the operating frequency.

Adjusting the Low Frequency Roll-off

Repeatedly press the AUDIO button until the LF roll-

off adjustment screen appears. Then press and hold

the AUDIO button while selecting the desired roll-off

frequency with the UP and DOWN arrows.

Attaching a Microphone and Adjusting Gain

The control panel Modulation LEDs indicate the modu-

lation level and limiter activity. Once set, the transmit-

ter’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 position of the microphone. The audio input level

can be set with the unit in Standby Mode or while pow-

ered up in 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.

See the following page for suggestions on using

the microphone connector and sleeve

2) Place the transmitter 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 audio level 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 -20 LED occasionally ﬂickering red.

This will maximize the signal to noise ratio of the

system with full modulation and provide subtle limit-

ing to prevent overload and audible compression of

signal peaks.

Note: Setting the audio level too high reduces the

dynamic range of 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 turn the transmitter off, then power it

up again in normal operation so the RF output will

be on. Then the other components in the sound or

recording system can be adjusted.

The roll-off frequency can be set to 35, 50, 70, 100, 120

and 150 Hz.

LECTROSONICS, INC.

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Lectrosonics SMa User Manual Page 10

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