User Manual - HMA

Wideband Digital Hybrid
®
Plug-On Transmitter
Rio Rancho, NM
11
and high fault current with high resistance in the power
supply feeds to pins 2 and 3. This provides protection if
the supply current is accidentally shorted to ground and
also keeps the microphone from being attenuated by
the power supply.
The HMa 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 HMa can also supply more than twice
the current of competing 48 Volt plug on units and pro-
vide four times the current for some very high end 15
Volt microphones.
FREQ Button Settings
Press the FREQ button on the Control Panel to enter
this setup screen. The display will vary depending upon
which StepSize setting is selected. See Selecting Step
Size on page 9.
Note: The default display is in MHz. Pressing
the FREQ button again displays the operating
frequency as a two-digit hexadecimal number that
corresponds to legacy Lectrosonics products that
used two 16-position switches to set the frequency.
While holding the FREQ button, use the UP or DOWN
arrow buttons to change the frequency.
Note: The operating frequency displayed on the
LCD wraps as it reaches the upper or lower end of
its range.
Set Up in 100kHz Step Size
Frequency displayed as
two-digit hexadecimal
number
Frequency displayed
in MHz
The operating frequency can
be displayed either in MHz or
as a two-digit hexadecimal
number. The example of the
two-digit display shown here
indicates CH (channel) and 2C
as the frequency.
The frequency can be set with
the unit in standby mode or
when powered up for normal
operation.
Set Up in 25kHz Step Size
Frequency expressed in MHz
The hexadecimal display in the 25 kHz mode will
appear with a decimal suffix to indicate the 25 kHz
steps.
Standard
frequency
block (22)
Frequency
in hex
code (C8)
Offset in
MHz (.75)
Frequency in hex
Examples:
644.400 MHz
644.425 MHz
644.450 MHz
644.475 MHz
Lock/Unlock Screen
Simultaneously pressing and holding both the UP and
DOWN arrow buttons during normal operation starts
the LOCK timer. The timer starts at three and counts
down to zero. When the timer reaches zero, the key-
pad controls are locked.
The LCD will display the locked condition as long as
the arrow buttons are held, then revert back to the
previous screen when either button is released.
With the controls locked, the AUDIO and FREQ but-
tons can still be used to display current settings. Any
attempt to change a setting by pressing either the UP
or DOWN arrow button will result in an on-screen Loc
reminder that the controls are locked.
NOTE: The control panel can be unlocked by
removing the batteries or using the “dweedle”
tone remote control.