Clear-Com TEMPEST 2400 Dokumentacja Pobierz pdf (Strona 43)

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Tempest 2400 Wireless Intercom System

Auto-Null Procedure

Turn off all TALK buttons on both the wired and wireless systems. Since Tempest monitors a self

generated tone to adjust the Null characteristics, any sounds entering through either the wired or wireless

intercom systems will interfere with the nulling process. When the Auto-Null or Manual Null menu screens

are accessed, Tempest sends a Mic Kill signal to all wireless beltstations, but the wired communication

stations will need to be turned off individually, or a hardwired Mic Kill signal will need to be initiated.

On the Tempest base station press MENU to open the Main Menu. Rotate the Volume Control to scroll

through the menu options to the “Wired Intercom Settings” and select “Auto-Null”. Select “Null Now” to

start the Auto-Null process. Normal functions will be interrupted for about 10 seconds during the Auto-Null

process. Progress of the null process can be observed on the base station LCD display.

The base station display will indicate “Auto-Null Complete” once the Auto-Null process is completed.

Press MENU to escape to the Operational screen.

Activate Auto-Null for new connections, or whenever the 2-Wire system changes significantly such as

when additional wired belt packs are added or removed, or when cable lengths are changed significantly.

Test for Echo

Talk into the wireless system for at least 10 seconds to test for echo. Echo cancellation (Ecan) software is

disabled in the Auto-Null and Manual Null screens, to insure the best hardware null. Press MENU to exit

the nulling menu screen, and to enable Ecan. When Ecan is first enabled it requires up to 10 seconds for

it to achieve convergence. There will usually be some noticeable echo during the first few seconds of

testing and the echo will diminish over time as the Ecan software converges to an inaudible level. Brief

louder active audio can help accelerate efficiency.

If multiple base stations are connected by 2-Wire intercom connections, each base station must be nulled

separately. Null one base station at a time.

Manual Null

Generally Auto-Null will adequately control the inherent echo caused by the 2-wire hybrid circuitry.

However, “Manual Null” is available if there is residual echo.

If echo persist after testing for at least thirty seconds:

1. Turn off all

TALK buttons. Since Tempest analyzes a tone to adjust the Null characteristics, any

sounds entering through the wired or wireless systems will interfere with the nulling process.

2. Press MENU and advance to the Manual Null screen.

3. Press Channel SEL to advance to the desired channel.

4. Rotate the “IN” knob to adjust the “RBAL” null value until the “Amplitude” is minimized.

5. Rotate the “OUT” knob to adjust the “CBAL” value until the “Amplitude” is minimized.

6. Repeat the “RBAL” and “CBAL” adjustment. The repeat process and order of adjustment of the

process is important because the “CBAL” adjustment is most effective when the “RBAL” is close

to its absolute minimum.

7. Once the best null is achieved, turn the “IN” knob clockwise to add ten to the “RBAL” value. For

example, if the minimum “RBAL” value is 123, adjust to 133.

8. Exit the Manual Null screen. Test for echo for at least 10 seconds. It will take up to 10 seconds for

echo cancellation software to achieve maximum efficiency.

If the echo is not acceptable, use the IN knob to adjust the “RBAL” null value up one and test again. If

necessary, turn the “RBAL” value down two and test again. Continue with this trial and error method until

the echo is minimized.

Manual null requires each channel to be nulled individually. Return to the Null Screen and press SEL to

advance to the next channel. Repeat for all channels.

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