Zaxcom TRX900 User Manual - page 2
The last seven menu pages are infrequently used special functions. In order to get to those
pages the MENU key must be held while powering up the transmitter. To exit this special menu
system cycle power off then back on.
ID CODE #0 SELECT PAGE: Changes the security0 code (normally should be set to zero)
ID CODE #1 SELECT PAGE: Changes the security1 code (normally should be set to zero)
FORMAT SELECT PAGE:
Changes the transmission data format
HIGH-PASS FILTER PAGE:
Changes the cutoff frequency of the high-pass filter
Limiter ON/OFF PAGE:
Changes the peak limiter state
Group SELECT PAGE:
Changes the selection of a control group for remote control
UNIT SELECT PAGE:
Changes the unit ID code for remote control
TEXT NAME PAGE
Allows entry of Text identification metadata for file output
POWER UP LOCK/UNLOCK
Selects the lock mode on power up
Repeatedly press the FNCT key to cycle through the following menu pages.
PACIFIER PAGE
At power-up the transmitter will enter the home pacifier page. The UP and DOWN keys have no
function in this page. In this page the unit will display the Txfrequency, battery level and the mode
of the recording.
AUDIO GAIN PAGE(s)
This page is indicated by the word GAIN on the left side of the display. The two-digit number
indicates the gain setting of the mic preamp. When audio is applied to the microphone input the
LCD will display the audio level. The mic preamp gain may be adjusted in this page by pressing
the INC or DEC keys repeatedly. Unless a microphone is connected to the unit's input the
display will go blank but stay in the gain setting mode. If a significant audio signal is present, the
display will meter the signal level horizontally from left to right, from -40 dB to 0 dB. As you speak
into the microphone, you can raise and lower the gain with the UP keyand the DOWN key. The
gain is adjusted in increments of 2 dB.
One of the key features of the unit is a digitally controlled analog limiter located before the A/D
converter. This means that the digital signal processor can automatically turn down the mic
preamp gain when excessive audio is detected to prevent clipping of the A/D converter. This
compressor/limiter will engage before signal exceeds the digital capabilities of the signal path.
The compressor/limiter will activate at about 6 dB from clipping digital clipping would occur at
0 dB). The gain level should be set low enough so the compressor/limiter does not engage
even when the talent is shouting. This gain setting will remain intact even when the battery is
removed.
TX CHANNEL SELECT PAGE
This page will display the current TX channel . To change channels, press the UP and DOWN
keys. The TX channel is displayed directly in MHz.
Changing the channel will prevent the transmitter from transmitting for 1 second. This allows the
user to change channels without transmitting over every single channel that is encountered while
obtaining the desired destination channel frequency. If the channel is changed quickly the
transmitter will remain quiet until the desired channel has been selected.
When operating multiple transmitters in the same location it is recommended that a channel
spacing of at least 1 MHz be maintained. If channel frequencies are difficult to obtain the
minimum channel spacing can be as low as .7 MHz when set to US modulation or .5 MHz when