Configuration & Controls
12
Sonifex HY-02 User Handbook
HY-02 Alignment Procedure
The HY-02 is aligned and tested at the factory before you receive it, so that this procedure does not need to be carried
out before use. Please note that you should only realign the product if you have sufficient knowledge and test equipment
to do so and it has been advised by a Sonifex member of staff.
Connect the equipment with a line analogue circuit in place of the telecommunications network (Figure 2-3) and ensure
that the line input is connected to a signal source and the line output is connected to a measuring instrument.
Figure 2-3 : Line Analogue Circuit
The internal DIL switches SW2 – (See Figure 2-4) should be at the ‘ON’ position giving Noise Gate Threshold – ‘OFF’, CAP
SET – ‘ON’ and RES SET – ‘ON’.
Power the equipment and operate the line divert switch connecting the equipment to the line analogue. With 0 dB at
1KHz at the line input measure the voltage across the line analogue, which should read – 9dB. This may be adjusted by
means of the limit level control, RV2, as follows:-
•
With +20 dBm line input set the voltage across the line analogue to 4 dB and recheck that 0 dB line input gives – 9dB
at line analogue.
•
Remove the 0 dB line input and connect the signal source at –74 dB nominal into the MIC Input and set the MIC GAIN,
RV1, to give –9 dB at the line analogue.
•
Remove all line and mic inputs and inject –13dB 1K Hz signal across the analogue line and adjust the output level
control, RV3, to give 0 dBu at the output (unterminated). Set the input level to –30 dB 1KHz and set the NOISE GATE
DIL SWITCH ON and adjust the NOISE GATE THRESHOLD control, RV4, to just operate the noise gate and produce a
noise gated level of approximately –52 dB.
Check that a –29 dB input will open the gate to give an output level of –16 dB. Reset the NOISE GATE DIL SWITCH OFF.
Remove the signal input from the line analogue. Set the line input to –20 dB 1KHz. With an oscilloscope set to 5V/div,
1mS/cm, probe on T1 and set RV5 SAMPLE THRESHOLD anticlockwise until a gating waveform is just observed. Check at
–21 dB input the gate waveform is suppressed. This sets the SAMPLE THRESHOLD.
With a 0 dB 1kHz signal at the line input, observe the line output and adjust RES SET RV6 for minimum residual 1kHz and
then CAP SET RV7 for minimum residual 1kHz. Reset RV6 and RV7 to obtain a complete null at typically –55 dB 1kHz.
Reset the DIL switches to RES AUTO and CAP AUTO and NOISE GATE ON for automatic operation.
Pin 2
HY-02
Telephone Line Plug
Pin 5
Telephone Line
Analogue Circuit
8
20R
0.
022
uF
15
0R
0.
1u
F