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8
VAD-2 Installation and Operation Manual
INSTALLATION
INSTALLATION
Installation of the VAD-2 in high RF environments should be performed with care.
Shielded cable is suggested for all control and the audio output. All shields should
be tied to the
“CGND”
terminals. The station ground should be connected to the
chassis ground screw located on the far right side of the VAD-2 as viewed from the
rear. It is recommended that all cables connected to the VAD-2 be looped through
ferrite cores to suppress RF. Surge protection with RF filtering such as the Tripp
Lite “ISOBAR 4 or 6” is also suggested for the wall transformer. The purchase of
an inexpensive UPS will provide back-up power in case of a power outage.
Connecting your equipment
The VAD-2 interfaces to your equipment through the rear panel screw terminals.
Follow the legends for the desired relays, inputs and audio output connections,
which appear on the lip of the printed circuit board and also on the layout drawing
on the last page of this manual. Strip each conductor and insert the conductor into
the terminal and screw down the capture screw. The terminals accommodate wire
sizes from 18 - 28 AWG solid or stranded wire.
Status Inputs
Connection for input 1 is made between the terminal labeled “IN-1” and Ground, while
input 2 may be connected to the terminal labeled “IN-2” and the ground terminal.
Silence Sensor inputs
These are stereo 10 k ohm unbalanced inputs and are summed together and moni-
tored for silence.
BOTH
channels
MUST
go silent to trip an alarm. The alarm
threshold is set at –20dbu. Connect your unbalanced source equipment to either or
both inputs and tie the ground to the
“AGND”
terminal. If your source equipment
is balanced, use the "+" and GND terminal from the source.
Do not connect the "-"
terminal to ground of your source equipment.
Shields should be tied to the
“CGND”
terminals. The SS LED is illuminated when you have audio applied to
the inputs. When the SS is in an alarm condition, the SS LED will flash. The time
delay is user programmable for 10, 30, 60 (seconds) 1.5, 2, 2.5, 3, 4, & 5 minutes.
Factory default is (0) OFF.
Relays
Connection for relay one is between the K1-A and K1-B terminals. Relay two is
between terminals K2-A and K2-B. Limit contact current to 1 amp at 30 vdc.
Note: For safety, never connect 120 Vac circuits to these relays!
Telephone “CALLER” line level output
Balanced CALLER telephone line audio output is available between the Aud-A and
Aud-B terminals.
NOTE:
NOTE: Some features
may require the remov-
ing of the chassis cover.
Caution should be
observed. Hazardous
voltages may be present
on the printed circuit
board.
NOTE:
Both status inputs
employ a 4 second
debounce (response
delay).
NOTE:
The 5-vdc TTL/CMOS
compatible inputs are
configured as a divider.
A low input must be
between 0 and + .6 vdc,
while a high must be
b 4.00 and +
5.00 vdc. This should
help in noisy (RF, etc)
environments.
