User's Manual

T4
LECTROSONICS, INC.
10
Accessories
CH20
Power supply for IFB base transmitters with locking
LZR power jacks; 110 VAC input, 12 VDC regulated
output; 400 mA max.
21586
DC16A Pigtail power cable, LZR to strip & tin
SNA600
Collapsible dipole antenna that adjusts over a wide
frequency range. Ideal for situations where a full
360 degree receiving pattern is required as op-
posed to a directional pattern.
ALP600
Shark Fin style Log Periodic Dipole Array (LPDA)
that provides a useful directional pattern over a
broad frequency bandwidth. Ideal for portable
applications including temporary setups for fi eld
production.
ALPKIT
Stainless steel kit for mounting SNA600 and
ALP600 antennas on photo and video tripods, light-
ing equipment, and standard microphone stands.
ARG15/ARG100
Coaxial cables for remote antennas available from
Lectrosonics in a variety of lengths from 2 to 100 ft.
RMP195
4 channel rack mount for up to four T4 IFB
receivers. Rocker switch installed to work as a mas-
ter power switch if desired.
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 T4 input level to the
incoming signal from the sound source to provide full
modulation and maximum dynamic range.
If the audio level is too high — the audio metering
will exceed the 0dB level too frequently. This condi-
tion 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 0dB 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.
The limiter uses a true absolute value circuit to detect
both positive and negative peaks. The attack time is 5
milliseconds and the release time is 200 milliseconds.
Occasional limiting is 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 settings of the AUDIO LEVEL
control, 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 adjust-
ment for each individual, adjust it for the loudest voice.
CH20
SNA600
ALP600
ARG15/ARG100
RMP195