Lectrosonics Inc LTC1 사용자 설명서

Digital Hybrid Wireless Belt-Pack Transmitter

Rio Rancho, NM

11

Adjusting the Input Gain

The two bicolor Modulation LEDs on the control panel 
and keypad provide a visual indication of the audio 
signal level entering the transmitter. The LEDs will glow 
either red or green to indicate modulation levels as 
shown in the following table.

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:  Full modulation is achieved at 0 dB, when 
the “-20” LED first turns red. The limiter can cleanly 
handle peaks up to 30 dB above this point.

It is best to go through the following procedure with the 
transmitter in the standby mode so that no audio will en-
ter the sound system or recorder during adjustment.

1) With fresh batteries in the transmitter, power the 

unit on in the standby mode (see previous section 
Powering On in Standby Mode).

2) Navigate to the Gain setup screen.

Gain

LineIn
Freq.
MuteSw

-40

-20

0

Gain

25

3) Prepare the signal source. Position a microphone 

the way it will be used in actual operation and have 
the user speak or sing at the loudest level that oc-
cur during use, or set the output level of the instru-
ment or audio device to the maximum level that will 
be used.

4) Use the   and   arrow buttons to adjust the gain 

until the –10 dB glows green and the –20 dB LED 
starts to flicker red during the loudest peaks in the 
audio.

5) Once the audio gain has been set, the signal can 

be sent through the sound system for overall level 
adjustments, monitor settings, etc. 

6) If the audio output level of the receiver is too high or 

low, use only the controls on the receiver to make 
adjustments. Always leave the transmitter gain ad-
justment set according to these instructions, and do 
not change it to adjust the audio output level of the 
receiver.

Selecting Step Size

This menu item allows frequencies to be selected in 
either 100 kHz or 25 kHz increments.

Compat

StepSiz

Phase
Locked

StepSiz

100 kHz
25 kHz

StepSiz

100 kHz
25 kHz

If the desired frequency ends in .025, .050 or .075 MHz, 
the 25 kHz step size must be selected.

Normally, the receiver is used to find a clear operat-
ing frequency. All Lectrosonics Digital Hybrid Wireless

®

 

receivers provide a scanning function to quickly and 
easily find prospective frequencies with little or no RF 
interference. In other cases, a frequency may be speci-
fied by officials at a large event such as the Olympics 
or a major league ball game. Once the frequency is 
determined, set the transmitter to match the associated 
receiver.

Selecting Frequency

The setup screen for frequency selection offers several 
ways to browse the available frequencies.

LineIn

Freq.

MuteSw
Rolloff

Freq.

b 19

494.500

51

Each field will step through the available frequencies in 
a different increment. The increments are also different 
in the 25 kHz mode from the 100 kHz mode.

Freq.

b 19

494.500

51

Freq.

b 19

494.

500

51

Freq.

b 

19

494.500

51

Freq.

b 19

494

.500

51