Clear-Com PTX-3 - Manual (Page 21)

Vitec Group Communications
PTX-3 UHF Digital Hybrid IFB Transmitter 1 - 1 5
7. Press the MENU button to display the Frequency Window and
adjust the transmitter to the desired frequency with the front panel
Up and Down buttons.
8. Position the microphone. The microphone should be placed where it
will be located during actual use.
OPERATING NOTES
The AUDIO LEVEL control should not be used to control the volume of
the associated receiver. This gain adjustment is used to match the
PTX-3 input level to the incoming signal from the sound source to
provide full modulation and maximum dynamic range, not to set the
volume of the associated receiver.
If the audio level is too high — the audio metering will exceed the 0 dB
level too frequently. This condition may reduce the dynamic range of
the audio signal.
If the audio level is too low — the audio metering will be too far below
the 0 dB level. This condition may cause hiss and noise in the audio, or
pumping and breathing in the background noise.
The input limiter will handle peaks over 15 dB above full modulation,
regardless of the gain control setting. Occasional limiting is often
deemed desirable, indicating that the gain is correctly set and the
transmitter is fully modulated for optimum signal to noise ratio.
Different voices will usually require different audio input gain settings,
so check this adjustment as each new person uses the system. If
several different people will be using the transmitter and there is not
time to make the adjustment for each individual, adjust it for the
loudest voice.
TROUBLESHOOTING
Note: Always ensure that the COMPAT (compatibility) setting is
the same on both transmitter and receiver. A variety of
different symptoms will occur if the settings do not match.
With the PRC-2 receiver no sound will be heard unless the transmitter
is set to the IFB mode. When used with receivers other than the
PRC-2, a variety of symptoms will occur when the COMPAT settings
do not match, ranging from no sound, to level inconsistencies, to
distortion of various degrees.
See the section entitled Front Panel Controls and Functions for details
on the available compatibility modes and how to select them.