Lectrosonics UM500 - Manual (Page 9)

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1.6M 100K
Frequency-Agile UHF Belt-Pack Transmitter
The –20 and –10 LEDs will blink:
• Once for 110 Series mode
• Two times for 300 Series mode
• Three times for some other receivers
• Four times for 500 Series mode
• Five times for IFB mode*
At powerup the transmitter will confirm the current compatibility mode with the number of blinks listed
here. This setting will remain the same until you reset it with the procedure listed above.
ATTACHING A MICROPHONE AND ADJUSTING GAIN
1) Ensure the battery is in good condition.
2) Insert the microphone plug into the input jack, aligning the pins;
be sure that the connector locks.
3) Attach the antenna to the SMA connector on the top of the
transmitter.
4) Mute the associated receiver’s audio output.
5) Turn on the transmitter.
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
6) Position the microphone in the location you will use in actual operation. While speaking or singing at the
same voice level that will actually be used, observe the Modulation LEDs. Adjust the AUDIO LEVEL
control until the –20 dB LED glows green with occasional red flickers and -10 dB glows green. This will set
the gain of your transmitter to between +0 dB and +10 dB modulation. (See chart to right.)
7) Once the gain has been adjusted, the audio system audio can be turned on to make level adjustments in
the main audio system.
Note
The transmitter Audio Level Control should not be used to control the volume of your sound system or recorder levels. This gain
adjustment matches the transmitter gain with the user’s voice level and microphone positioning.
OPERATING NOTES
If the audio level is too high — both LEDs will blink red frequently or glow a steady red. This condition may reduce
the dynamic range of the audio signal.
If the audio level is too low — neither 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 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.
ADJUSTING THE TRANSMITTER FREQUENCY
If you are experiencing interference from another signal on your frequency,
you may want to change the operating frequency of your system.
The left switch changes the operating frequency by 1.6 MHz per
step and the right switch changes it 100 kHz per step. Start by
changing the operating frequency in 100 kHz increments to
find a clear channel. If it is not possible to find a clear channel
using the 100 kHz switch, return it to its original position and
change the 1.6 MHz switch by one click then try the 100 kHz
switch again.
To gain access to these switches, slide the access door sideways
with a fingernail.
With the 500 Series receivers, a front panel LCD character display will indicate the
correct transmitter switch settings.
*Not available on earlier units.
Rio Rancho, NM – USA
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