Lectrosonics UT400 - Manual (Page 15)

Synthesized UHF Hand-Held Transmitter
Operating Notes
The Audio Level control should not be used to control
the volume of the overall sound system or recorder
levels. This gain adjustment is used to match the trans­
mitter gain with the user’s voice level and microphone
position.
If the audio level is too high — both Modulation
LEDs glow red sporadically. This condition will
reduce the dynamic range of the audio signal.
If the audio level is too low — neither Modulation
LED will glow, or only the -20 LED will glow green.
This condition may cause hiss and noise in the
audio.
Different voices will usually require different settings
of the Audio Level control, so check the Audio Level
settings as each new person uses the UT. If several dif­
ferent people will be using the same UT and there is not
time to make the adjustment for each individual, adjust
it for the loudest voice.
Adjusting the Transmitter Frequency
If you are experiencing interference from another signal
on your operating frequency, you may need to change
the operating frequency of your system. This is done
through two Frequency Switches located under the Bat­
tery Compartment Cover.
The left switch is for coarse frequency adjustment, and
it increments the operating frequency in 1.6 MHz steps.
The right switch is for fine frequency adjustment and it
increments the operating frequency in 100 kHz steps.
Modulation LEDs Frequency Switches
-20 -10 Coarse Fine
Audio Level
All 400 Series receivers (and a number of earlier receiv­
ers) offer front panel LCDs that indicate the correct
transmitter switch settings, and provide built-in scan­
ning functions to help locate clear channels. Use the
scanning functions on these receivers to find a clear
channel, then switch both the receiver and transmitter
to the Frequency Select Switch settings indicated in the
receiver’s display.
The R400A model receivers have an autotune function
(SmartTune™) that automatically locates clear operat­
ing channels.
If your receiver does not have an autotune or built in
scanning function, manually tune the receiver across its
band and find a frequency where little or no RF activity
is displayed, with the transmitter turned off .
After finding a clear channel, set the transmitter to this
new frequency, then turn it on and make sure the RF
signal is strongly indicated at the receiver. Be sure
the switch settings on the receiver and transmitter are
set exactly the same. If, for example, the 100K switch
is one click above or below the desired frequency, the
receiver will indicate RF, but no audio (or severely dis­
torted audio) will be produced.
Rio Rancho, NM 15