Instruction Manual
53 Tempest®24 00 2 -Channel 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 informa on on a single XLR-3M cable (2 wires and a ground). Each 2-Wire intercom type has a di erent
wiring scheme and unique line characteris cs. It is impera ve to have the rear panel connec ons and the front panel se ngs
adjusted correctly for audio to pass correctly between the systems.
Steps to Confi gure a 2-Wire Intercom Connec on
• Adjust the Intercom Type Slide Switches to appropriate manufacturer compa ble se ng- RTS, Clear-Com, Bal.
• Select 2-Wire connec on for the appropriate channels.
• Make the 3-pin XLR physical connec ons to the Tempest BaseSta on and the 2-Wire system.
• Null the system.
• Adjust IN/OUT volume levels between the Tempest Wireless System and the 2-Wire system.
Always con rm that the 2-Wire intercom system is func oning properly before connec ng the Tempest Wireless system.
Test each wired communica on sta on before connec ng the wireless system. Con rm opera on of the wireless system
before connec ng to the wired system.
A er the slide switch is set correctly, the appropriate channels are set for 2-Wire opera on, the XLR cable connec ons are
made, and power is provided by the 2-Wire 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 BeltSta ons un l the system is nulled. The echo should not prevent
communica on but is undesirable. The volume levels into or out from Tempest may need adjus ng so that rela ve volumes
are the same.
Echo Cancella on Menu
In the BaseSta on’s Tech Menu is a selec on for “Echo Cancella on” (ECAN). This refers to so ware that assists in removing echo
from 2-Wire intercom connec ons. Hardware connec ons need to be op mized with the null procedure to minimize echo in the
physical link so that the so ware can remove any residual echo.
In the Tech menu, “Echo Cancella on” is “ON” by default, but is only enabled for channels that are selected for opera on with a
2-Wire intercom and have a physical connec on to a 2-Wire system. See “Nulling” Sec on of this manual.
If a 2-Wire intercom is never u lized in a system, ECAN can be turned “OFF” to ensure that it cannot create undesirable e ects.
This should not be necessary, though, and it is recommended that you keep ECAN “ON” at all mes.
ECAN is disabled while the BaseSta on’s Auto-Null or Manual Null menu screens are ac ve, to ensure that the hardware is
op mized for echo reduc on. When ECAN is enabled, it requires up to 10 seconds of ac ve audio to achieve maximum e ciency.
Brief loud ac ve audio can help accelerate e ciency.