Lectrosonics TA1 User Manual
TAl
T M
Line Level Adapter
TECHNICAL DATA
Feature Highlights
• Connects a teleconferencing hybrid or
other audio source to LecNet Automatic
Mixers
• Expansion I/O port connects to LecNet
bus
• Picks up a “mix minus” output from the
mixer
• Switchable participation in the automatic
mixing algorithm
• Balanced XLR input and output
• Independent level control of input and
output
TM
The TA1 Line Level Adapter is designed for connecting an
Audio/Video Teleconf erencing Hybrid to Lectrosonics automatic mixers. It can also be used to add a line level audio
input or interconnect a tape recorder to the mixer.
With the AUTO MIX switch in the “ON” position, the video
codec (or other audio source) will participate in the automatic mixing algorithm applied by the mixer.
cases, this will eliminate the need for acoustic echo cancellation within the hybrid in teleconferencing applications that
use a sound system with multiple microphones and loudspeakers. In addition, an incoming signal from the far end of
the telephone or ISDN line will attenuate the gain on the
local microphones to eliminate acoustical coupling between
microphones and loudspeakers that could cause a feedback loop.
The TA1 picks up a “mix minus” output from the mixer
expansion bus. This output contains all inputs connected to
the mixer, but does not include the signal connected to the
INPUT jack on the TA1.This arrangement provides simultaneous send/receive for a teleconferencing hybrid and
prevents the output of a tape recorder in the “record” mode
from getting back to the input.
When used with the AM8 or AM16 mixer, TH3 telephone
hybrid, and a video codec, 3-site bridging can be accomplished without the need for any other routing device.
The TA1 comes with two 24” eight pin expansion cables,
part # 21592.
In many
• Simultaneous 2-wire/4-wire conversion
for 3-site conference bridging with AM8
and TH3
TA1 Operating Instructions
Since the TA1 offers level control of the balanced input
and output signals, the device is not limited to teleconferencing applications. It can also be used to include
any balanced or unbalanced line level signal into the
LecNet automatic mixing algorithm.
The TA1 is connected to a LecNet automatic mixer via
the Expansion port, i.e. TA1’s EXPANSION OUT port is
connected to the mixer’s EXP ANSION IN port.The AUTO
MIX switch determines if the equipment connected to
the mixer will participate in the automatic mixing algorithm. The TA1 is connected to the Audio/Video
Teleconferencing Hybrid or other audio device via the
INPUTand the OUTPUT XLR jacks in a fully balanced
form:
Pin 1 — Ground
Pin 2 — Signal Hi
Pin 3 — Signal Low.
AM8 Rear Panel
PWR
EXPANSION
IN
M
A
S
S
L
(CH40)
T
A
E
V
OUT IN
R
E
20 VAC
RS232
If the device connected to the TA1 has unbalanced Input/
Output connectors, pins 3 & 1 should be jumpered on the
TA1 INPUT XLR jack with the input signal applied to pin
2(+) and pin 1(-). To connect the TA1 output to an unbalanced load, no jumpers are required. Simply connect the
load to the TA1 OUTPUT XLR pin 2 (+) and pin 1(-).
The level of these signals is controlled via the le vel potentiometers located near the XLR jacks.
MM Out
2
Input
1
Output
Bridge
Input
Level
1
3
TX
Bridge
Output
Level
2
3
Log
Amp
Auto
Mix
Main In
Mix Minus
Out
Mix Minus In
Main Out
Auto Mix
Log Out
Expansion
In
Expansion
Out
LECTROSONICS T A 1
EXP IN
EXP OUT
Audio Teleconferencing Hybrid
LINE PHONE
TA1 Front Panel
LINE LEVEL ADAPTER
AUTO MIX
ON
OFF
PWR (CH40)
Receive Out
INPUT
Transmit In
2
0 6
LEVEL
4
2
0 6
Specifications
Connectors: Expansion port: 8-pin mini DIN
Output Audio: Actively balanced, RF filtered
Input Audio: Actively balanced, RF filtered
Maximum Gain: 10 dB in the input or the output
Power Requirements: 80mA at 20VAC
Power Consumption: 3 watts max at 20VAC
Weight: 0.25 lbs.
Dimensions: 3.25” wide, 1.25” high, 4.50” deep
TA1-12/00
Input/Output: XLR
path
TA1 Rear Panel
4
OUTPUT
The default state of the TA1 enables 3-site bridging
with a LecNet automatic mixer, the TH3 telephone
hybrid, and a video codec. To disable this feature, the
two jumpers shown above must be in the OFF position. Remove the screws on the front panel and rear
side panels and slide the chassis out of the housing
for access to the internal jumpers.
LECTROSONICS T A 1
INPUT
EXP IN
2
0 6
LEVEL
4
EXP OUT
LINE LEVEL ADAPTER
AUTO MIX
ON
OFF
2
4
0 6
OUTPUT
PWR (CH40)
LECTROSONICS
581 Laser Rd NE - Rio Rancho, NM - 87124 USA
(800)821-1121 (505)892-4501 Fax(505)892-6243
www.lectrosonics.com sales@lectrosonics.com
®
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