4
HEADSET MICROPHONE WITH-BELT-SWITCH:
The “M34” Headset Microphones and Belt Switches are an additional option for
environments with a high level of ambient noise. Keying the belt switch overrides the
default mode of the intercom and enables audio transmission to all Primary units in the
intercom system. Figure 5 on page 11 illustrates a common intercom system where a
headset microphone and belt switch are used.
REMOTE POWER:
The “‑1” models are designed to provide power to “‑1” remote intercom units. The
AC‑powered main unit provides 12 Volts DC‑power and audio in the same cable to the
remote unit. The A “‑1” unit can provide power to just one remote unit. Figure 3 on page
9 illustrates this configuration.
PRE-AMPLIFIER:
The “‑8” models are equipped with a pre‑amplifier and are designed for use with
Secondary speaker units such as the AD‑SV‑25 Remote Speaker with Volume Control.
The “‑M44” option equips the “‑8” Primary unit with a knob for controlling the volume of
remote speakers such as the AD‑SF‑25 Flush Mount Speaker or the AD‑SS‑25 Swivel
Mount Speaker. Figures 6 on page 12 and 7 on page 13 illustrate intercom systems with
the “‑8” and “‑M44” options.
EXTERNAL-POWER-SOURCE:
The use of an external power source allows the user to configure intercom systems
made up of “‑1” DC‑powered Primary and Secondary units. Figure 8 on page 14
illustrates such a system.
SURGE PROTECTION:
Metal Oxide Varistor (MOV) devices are used to protect the audio lines. The intercom
must have Earth or Chassis Ground terminated to it to ensure surge protection.
The output amplifier of the Atkinson Dynamics intercom offers full short circuit
protection and overheat protection on AC models only.
FOOT PEDAL READY:
Models with the “‑2” option are designed for hands‑free activation of the Talk/Listen
switch. Figures 9 and 10 on pages 16 and 17, and 17 on page 23 show examples of
intercoms with this option. A heavy‑duty foot pedal (Model ADFP) is available through
Atkinson Dynamics.
AUXILIARY SIGNAL:
Models with the “‑3” option are equipped with a call button that provides a contact
closure for an attention‑getting auxiliary device, e.g., a strobe light. Figure 13 on page
19 demonstrates an intercom system with this option. Atkinson Dynamics offers a low
profile strobe light that is available with an amber or red lens, pipe or surface mount
configuration, and in three voltage variations.
ZONED SYSTEM REMOTE:
Models with the “‑6” option are designed for use in a zoned system. Figure 11 on page
17 illustrates a zoned intercom system. A Primary intercom can select (via a switch box)
to talk to any one or more remotes in a system. Each remote unit is equipped with a
Talk/Listen switch that enables communication to the Primary intercom, even when that
zone is not selected. Atkinson Dynamics offers 6‑zone and 12‑zone switch boxes.
MONITOR SWITCH:
Models with the “‑M22” option are equipped with a monitor on/off toggle switch. When
the monitor switch is in the on position, the remote unit becomes a Secondary and
defaults to talk mode. Figures 14 and 15 (pages 20 and 21) illustrate systems with this
feature.
