Owner`s manual

6
Zaxcom TRX900 and TRX900AA Recording Wireless™ Owner’s Manual
Chapter 1
be as low as .6 MHz when set to US modulation or .5 MHz when set to European modulation. When you
use a large channel spread between transmitters, it aids in reception. Maintaining a distance of 20 feet or
more between any transmitter and receiver also aids in reception when several transmitters are used at the
same time. This prevents any transmitters from de-sensing the receiver.
Channel plan programs used to prevent intermod problems are not needed when using the Zaxcom Digital
Wireless system. However, if regular FM mics are being used close to the Zaxcom system then you must
plan your channel assignments to prevent intermod. When two FM transmitters come close to each other
they can transmit interference on adjacent channels. Since this interference is transmitted into the air there
is no way for the Zaxcom receiver to reject this interference. However, the Zaxcom transmitters do not
suffer from this problem.
Lock Out Page
This page has a five second countdown. After five seconds, when the counter reaches zero (0), the LCD
displays LOCKED and cannot be changed without holding down both the Menu and INC buttons at the
same time. Powering the unit off also clears the lock.
The lock out mode prevents buttons on the TRX900/900AA from accidentally from being pressed. As a
safety feature, when the unit is locked, all buttons are disabled except the ability to unlock the unit.
If you scan past the LOC display to the next menu item, the LOCK MODE will not be engaged.
Unlocking the TRX900/900A
To unlock the transmitter, press and hold the MENU and INC keys simultaneously. When the TRX900/
TRX900AA unlocks, the LCD displays UNLOCKED.
Specialized Function Pages
The specialized function pages are accessed by holding the menu key down when powering on the
TRX900/TRX900AA. These pages cannot be accessed when the unit is already powered on, the
transmitter must be off, then powered while holding the menu key to access these pages. These pages are
in the extended menu system.
When powered in the extended menu system, the transmitter briefly displays EXT MENU on the LCD.
Like the standard pages, pressing the menu button cycles through the pages.
To exit the extended menu system, power off the unit. All changes are saved to a FLASH ROM.
RX Channel Select Page
This page allows you to change the RX channel center frequency used for IFB. There was a change in the
frequency range of the TRX900 and TRX900AA. The frequency range was changed so that could the
TRX900 could be used worldwide. The freqency was changed to 2.4 GHz with 100 channels.
Early Models
On early TRX900 and TRX900AA models, the frequency ca
n be adjusted throughout its frequency range
of 944.0 - 952.0 MHz. This frequency can be adjusted in 100 kHz steps.