TA1 Operating Instructions
Since the TA1 offers level control of the balanced input
and output signals, the device is not limited to telecon-
ferencing 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 EXPANSION IN port.The AUTO
MIX switch determines if the equipment connected to
the mixer will participate in the automatic mixing algo-
rithm. 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.
PWR
IN
(CH40)
OUT IN
EXPANSION
M
A
S
T
E
R
S
L
A
V
E
20 VAC
RS232
LECTROSONICS T A 1
LINE LEVEL ADAPTER
EXP OUT
EXP IN
AUTO MIX
OFF
ON
PWR (CH40)
LEVEL
0 6
2
4
0 6
2
4
LINE PHONE
AM8 Rear Panel
TA1 Front Panel
TA1 Rear Panel
Audio Teleconferencing Hybrid
Receive Out
Transmit In
INPUT
OUTPUT
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 unbal-
anced 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 level poten-
tiometers located near the XLR jacks.
1
2
3
1
2
3
Input
Output
Input
Level
Output
Level
Log
Amp
Expansion
In
Expansion
Out
Main Out
Auto Mix
Log Out
Mix Minus In
Main In
Auto
Mix
Mix Minus
Out
TX
Bridge
MM Out
Bridge
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 posi-
tion. 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.
Specifications
Connectors: Expansion port: 8-pin mini DIN
Input/Output: XLR
Output Audio: Actively balanced, RF filtered
Input Audio: Actively balanced, RF filtered
Maximum Gain: 10 dB in the input or the output
path
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
LECTROSONICS T A 1
LINE LEVEL ADAPTER
EXP OUT
EXP IN
AUTO MIX
OFF
ON
PWR (CH40)
TA1-12/00
INPUT
OUTPUT
LEVEL
0 6
2
4
0 6
2
4
LECTROSONICS
®
581 Laser Rd NE - Rio Rancho, NM - 87124 USA
(800)821-1121 (505)892-4501 Fax(505)892-6243
(12 pages)
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