Optional Football Modifications; General Description; Eliminating Mic Kill And Call Signal; Restoring Mic Kill And Call Signal - Telex BP-2002 Operating Instructions Manual

Headphone Amplifier
Maximum Output:
3.5 ±10% Vrms into 150Ω headset
Frequency Response:
200Hz to 8kHz ±2dB
Audible Alert:
1kHz, at the headset
Total Harmonic Distortion:
Less than 1% at less than 3.25V
Sidetone:
17dB minimum range, adjustable

Optional Football Modifications

General Description

In Audiocom Intercom Systems, the Mic Kill feature is used to turn off any activated
microphone on a selected channel. The Mic Kill feature is activated when the
beltpack receives a 24kHz signal from the channel. In some applications, the Mic Kill
and Call Signal features are not desired and need to be disabled.

Eliminating Mic Kill and Call Signal

CAUTION: To prevent damage to the equipment, these modifications should only be
made by qualified technicians.
If desired, the Mic Kill and Call Signal features can be disabled in the BP-1002/2002,
by removing a surface mounted capacitor from the printed circuit board.
To remove the capacitor, do the following:
Before making changes to the printed circuit board, disconnect all power and
1.
line connections from the beltpack.
Refer to Figure 3, and locate C61 on the underside of the printed circuit
2.
board.
Remove capacitor C61 from the printed circuit board.
3.

Restoring Mic Kill and Call Signal

into 150Ω headset
RMS
Operation
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