User's Manual

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.
Block 470/19 Frequency Overlap
Frequencies 486.400 - 495.600 Overlap in Blocks 470 and 19
Block 470 and block 19 overlap each other in the
frequency range from 486.400 to 495.600 MHz. Since
block 470 starts at a lower frequency than block 19,
the hex codes (and pilot tones) will not match even
though the frequencies are the same in the overlap
zone. When using a transmitter on the A1 band with
a block 19 receiver, be sure the transmitter is set to
block 19 and check the hex code on the receiver to
make sure it matches the transmitter.
Call the factory for further questions on this issue.
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 hexadeci-
mal 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 (20)
Frequency
in hex
code (F6)
Offset in
MHz (.25)
Frequency in hex