Lectrosonics UH200d - Manual (Page 4)

CONTROLS AND FUNCTIONS
LIMIT LED
LEVEL LED
POWER
ON/OFF
LED
PWR OFF LEVEL
P HTM
N O PHTM 5V
1 5V
48 V
MIC LEVEL
PHANTOM POWER
VOLTAGE SELECT
POWER
SWITCH
0 1 2 3
4
5
6 7 8 9 A B C D E F
FREQUENCY
1.6MHz 100kHz
0 1 2 3
4
5
6 7 8 9 A B C D E F
FREQUENCY SWITCHES
(BEHIND DOOR)
INPUT
JACK
INPUT
JACK
Top View Control Panel
The UH200D may be used with a wide variety of microphones.
The 3-pin XLR connector on the UH200D allows the transmitter
to be used with any dynamic microphone, as well as many two
wire positive bias lavaliere systems (such as those systems
supplied by Lectrosonics).
POWER SWITCH
Turns the battery power on and off. Even when the switch is
turned off or on abruptly, the pilot tone muting system prevents
“thumps” or transients from occurring.
The PHTM (center) position of the power switch turns on the
phantom power while the NO PHTM (fully on) position disables
phantom power. Be careful to use the center position phantom
power only when necessary and keep the voltage selector switch
in the 5 Volt position for additional protection against accidents.
PHANTOM POWER VOLTAGE SELECT SWITCH
This switch selects from three voltages when the PWR switch is
in the mid position. The voltages are:
• 5 Volts for lavaliere microphones,
• 15 Volts for some professional mics requiring high current and
for many common stage mics that will operate over a wide
phantom voltage range of 12 to 48 Volts. With the proper
adapter, this position can also be used with T power micro­
phones. See our web site for details on finding or making the
proper adapter.
• 42 Volts for microphones that do in fact require a supply
greater than 15 Volts. (See below for a discussion of why 42
and not a “true” 48 Volts.)
For longest battery life use the minimum phantom voltage neces­
sary for the microphone. Many stage microphones regulate the
48 Volts down to 10 Volts or so internally anyway, so you might
as well use the 15 Volt setting and save some battery power. If
you are not using a microphone for the input device, turn the
Side View
phantom power off (off is the fully up position of the power
switch). The phantom power should only be used with a fully
floating, balanced device such as almost any type microphone
with a 3 pin XLR connector. If you use the phantom power with an
unbalanced device or if pins 2 or 3 are DC connected to ground,
then you will draw maximum current from the power supply. The
UH200D is fully protected against such shorts but the 9 Volt
battery will be drained at twice its normal rate.
The transmitter can supply 4 mA at 42 Volts, 8 mA at 15 Volts,
and 8 mA at 5 Volts. The 42 Volts setting actually supplies the
same voltage to a 48 Volt microphone as the DIN standard
arrangement due to a dynamic biasing scheme that does not
have as much voltage drop as the DIN standard. The 48 Volt DIN
standard arrangement protects against shorts and high fault
current with high resistance in the power supply feeds to pins 2
and 3. This protects the supply if the supply current is acciden­
tally shorted to ground and also keeps the microphone from
being attenuated by the power supply. The UH200D improves on
those functions and is able to use less power from the battery by
using constant current sources and current limiters. With this
dynamic arrangement the UH200D can also supply more than
twice the current of competing 48 Volt plug on units and provide
4 times the current to some very high end 15 Volt microphones.
The 5 Volt setting is provided for lavaliere microphones made by
us and others. Do not power lavalieres from the 15 or 48 Volt
setting as the microphone will be most likely destroyed.
Lectrosonics makes an adapter, MCA5X, that will adapt our
standard TA5F 5 pin microphones to the UH200D. This adapter
also provides protection against excessive phantom voltage. If
voltages higher than 5 Volts are applied to the adapter, a Zener
will shunt excess voltage to ground. The microphone won't work
until the voltage is correctly reduced to 5 Volts. If you have an
older lavaliere mic that was wired directly to an XLR for use with
the earlier UH200's, we strongly recommend building our protec­
tion circuit into the XLR to prevent accidental destruction of the
lavaliere.
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