Lectrosonics SM User Manual download pdf (Page 10)

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 fol-

lowing 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 receiv-

ers indicate the operating

frequency both in MHz and

644.400

as a two digit hexadecimal

number. This conforms to

Frequency displayed in

MHz

the Lectrosonics tradition

of setting the operating

frequency using two 16-po-

CH 2C

sition rotary switches. The

SM offers the ability to set

Frequency displayed as

two-digit hexadecimal

the operating frequency in

number

a similar manner. Press-

ing the FREQ button while the LCD displays the

operating frequency in MHz will change the display

to show the equivalent two-digit hexadecimal fre-

quency select switch setting. Simply use the Up or

Down arrow to increase or decrease the operating

frequency.

Modulation

LEDs

LCD

Control Panel

AUDIO Button PWR LED

UP Arrow

FREQ Button

Attaching a Microphone and Adjusting Gain

The front panel Modulation LEDs indicate limiter activ-

ity. (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.

Locking or Unlocking the Control Panel

LECTROSONICS, INC.

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Lectrosonics SM User Manual Page 10

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