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E a s i - P i c o U s e r G u i d e
4 0
Separate "R" (resistance), "L" (inductance), and "C" (capacitance) controls
compensate for each component of the line's impedance, providing the best null
possible.
The null circuit is effective on line lengths between zero and 4000 ft. with
impedances in the range of 120 to 350 ohms, and can reduce local audio in the
received signal by more than 0 dB over the frequency range of 200 Hz to 8 kHz.
To null one channel of the CCI-22:
1. Connect the external party-line devices to the CCI-22 channel. Make sure that
any connected devices do not have their microphones on.
2. Plug the accessory earphone into the front-panel jack labelled "Test". This will
disconnect the interface from the matrix and enable a test oscillator. The
oscillator produces a square wave with both low and high harmonics, allowing
testing of all frequencies. The test tone pulses approximately every 0.5 sec.
3. While listening to the test tone in the earphone, adjust the "R" control until
the tone is at a minimum.
4. Repeat Step 3 with the "L" and "C" controls. Because these controls interact,
steps 3 and 4 will have to be repeated several times the test tone is minimized.
Continue adjustment until the tone is minimal. If a deep null cannot be
obtained, it is likely that something is wrong either with the wiring in the
external party line or with one of the other devices attached to it.
Following are some troubleshooting hints if a deep null cannot be obtained.
If the "R" control is turned fully counter-clockwise, the line has either more
than one termination, or an excessive resistive load.
If the "R" control is fully clockwise, then the line has no termination.
The "L" control compensates for the low-frequency inductive and capacitive
elements the wiring of the external party line presents to the line. If the "L"
control is fully turned in either direction, it is likely that there is a problem in
the external party line. When a Clear-Com party line is connected, the "L"
control should be just to one side of its mid-pot position.
The "C" control compensates for cable capacitance; the setting depends on the
length of the line. If the "C" control is fully counter-clockwise, it indicates a
very short line (under 10 ft.); this is a valid setting for a short line.
If the "C" control is fully clockwise, it indicates an excessively long line (more
than 1300m (4000 ft)).
Содержание ECLIPSE EASI-PICO MATRIX
Страница 1: ...ECLIPSE EASI PICO MATRIX U s e r G u i d e...
Страница 17: ...E a s i P i c o U s e r G u i d e 1 1 PANEL TO MATRIX Figure 1 11 Panel to Matrix Connection...
Страница 30: ...E a s i P i c o U s e r G u i d e 2 4 Figure 1 25 Easi PiCo Front Panel Menus...
Страница 48: ...E a s i P i c o U s e r G u i d e 4 2...
Страница 57: ...E a s i P i c o U s e r G u i d e 5 1 Figure 2 51 Party Line Configuration Ports...
Страница 60: ...E a s i P i c o U s e r G u i d e 5 4 Figure 2 56 IFB Configuration Ports...
Страница 63: ...E a s i P i c o U s e r G u i d e 5 7 Figure 2 61 Panels Configuration Port Map...
Страница 67: ...E a s i P i c o U s e r G u i d e 6 1...
Страница 68: ...E a s i P i c o U s e r G u i d e 6 2...
Страница 72: ...W A R R A N T Y i v...