Lectrosonics UM400 - Manual (Page 3)

Frequency-Agile UHF Belt-Pack Transmitter
Thank you for selecting the Lectrosonics UM400 fre­
quency agile, belt-pack transmitter. The UM400 com­
bines over 80 years of engineering experience with the
very latest components, in a design that addresses the
most demanding professional applications.
The design of the UM400 was the direct result of nu­
merous conversations with users, staging and touring
companies and dealers across the US. The specific
concerns and needs brought up in these conversa­
tions led directly to the development of the operational
features offered on the UM400. Two hundred fifty six
frequencies are user selectable in 100kHz steps to al­
leviate interference problems in traveling venues, and
the low frequency roll-off is user adjustable to adapt to
varying acoustic environments and preferences.
The UM400 is a rugged, machined aluminum pack­
age with a removable, spring loaded belt clip. The
input section provides a correct input tap for virtually
any microphone or line level audio source. Five volts
of bias voltage is available to power electret mics with
either positive or negative bias. Level indicating LEDs
are provided on the control panel to make level settings
quick and accurate, without having to view the receiver.
The battery compartment accepts any 9 Volt alkaline
battery and makes a positive connection via self-adjust­
ing contacts. The antenna is a detachable, locking 1/4
wavelength flexible galvanized steel cable that connects
to a 50 Ohm SMA port on the transmitter.
Only the UM400 transmitter is covered in this manual.
Companion receivers are covered in separate manuals.
The UM400 will operate with any 400 Series Lectro­
sonics receiver and a variety of analog receivers in the
same frequency group.
Rio Rancho, NM