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Tempest 2400 Wireless Intercom System

2-Wire (Party-Line) Interface

2-Wire party-line intercom systems carry one or two (depending on the system type) channels of full

duplex intercom audio plus system power and other information on a single XLR-3M cable (2 wires and a

ground). Each 2-Wire intercom type has a different wiring scheme and unique line characteristics. It is

imperative to have the rear panel connections and the front panel settings adjusted correctly for audio to

pass correctly between the systems.

Steps to Configure a 2-Wire Intercom Connection

• Adjust the Intercom Type Slide Switches to appropriate manufacturer compatible setting- RTS,

Clear-Com, Bal.

• Select 2-Wire connection for the appropriate channels.

• Make the 3-pin XLR physical connections to the Tempest base station and the 2-Wire system.

• Null the system. For details see page 43.

• Adjust IN/OUT volume levels between the Tempest 2400 Wireless Intercom System and the 2-

Wire system.

Always confirm that the 2-Wire intercom system is functioning properly before connecting the Tempest

2400 Wireless Intercom System. Test each wired communication station before connecting the wireless

system. Confirm operation of the wireless system before connecting to the wired system.

After 1) the slide switches are set correctly; 2) the appropriate channels are set for 2-Wire operation; 3)

the XLR cable connections are made; 4) power is provided by the 2-W system or Master Mode; then

audio will pass between Tempest and the wired system.

Audio may develop an echo that is heard in the wireless beltstations until the system is nulled. The echo

should not prevent communication but is undesirable. The volume levels in to or out from Tempest, may

need adjusting so that relative volumes are the same.

Echo Cancellation Menu

In the base station’s Tech Menu is a selection for “Echo Cancellation” (Ecan). This refers to software that

assists in removing echo from 2-Wire intercom connections. Hardware connections need to be optimized

with the null procedure to minimize echo in the physical link so that the software can remove any residual

echo.

In the Tech menu, “Echo Cancellation” is “ON” by default, but is only enabled for channels that are

selected for operation with a 2-Wire intercom and have a physical connection to a 2-Wire system.

If a 2-Wire intercom is never utilized in a system, Ecan can be turned “Off” to assure that it cannot create

undesirable effects. This should not be necessary though and it is recommended that you keep Ecan “on”

at all times.

Ecan is disabled while the base station’s Auto-Null or Manual Null menu screens are active, to insure that

the hardware is optimized for echo reduction. When Ecan is enabled it requires up to 10 seconds of

active audio to achieve maximum efficiency. Brief loud active audio can help accelerate efficiency.

Auto-Null Explained

In 2-Wire intercom systems, inefficiencies in the hybrid circuitries that combine or separate the send and

receive audio signals onto the same pair of wires, inherently cause echo. Within analog systems the echo

is not noticeable but when connected to an extremely sensitive digital system the echo becomes more

problematic.

In order to minimize echo resulting from connection to an external 2-Wire system, it is necessary to

optimize the hardware of the hybrid circuitry in the Tempest base station. Tempest provides a user

initiated AUTO-NULL feature that automatically optimizes the 2-Wire interface. Nulling only impacts 2-

Wire hardwired intercom connections.

Auto-Null sends a tone to each of the 2-Wire intercom channel connections. The Tempest Wireless base

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