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All drawings appearing in this Recommendation have been done in Autocad.
ANNEX A
(to Recommendation Q.552)
Example of a longitudinal interference coupling network
The component should be chosen with small absolute tolerances (at least
resistors and capacitors with 1% and the inductance with less than 5%) and
matched to pairs where relevant to achieve a longitudinal conversion loss better
than 60 dB at 1000 Hz. For this LCL measurement a terminating resistance of 600
Ohms symetrically applied to each port should be used.
Figure A-1/Q.552 - T1105730-87
TABLE A-1/Q.552
Components list
Quantity Type
Metallized resistors
1 10 R1 . . . R10: ohm 1%, 1.1 W
100
2 4 R11 . . . R14: ohm 1%, 1.1 W
49.9
3 12 R15 . . . R26: ohm 1%, 0.35
133 W
4 12 R27 . . . R38: ohm 1%, 0.35
32.4 W
5 2 R39 . . . R40: ohm 1%, 0.35
24.9 W
6 4 R41 . . . R44:
Fascicle VI.5 - Rec. Q.552 PAGE1
200 kohm 1%, 0.35
W
Styroflex foil capacitors
1 4 C1 . . . C4: nF 1%, 160 V
15
2 8 C5 . . . C12: nF 1%, 160 V
7.5
3 4 C13 . . . C16: nF 1%, 160 V
28
4 2 C17 . . . C18: nF 1%, 160 V
24.3
5 2 C19 . . . C20: nF 1%, 160 V
20
6 2 C21 . . . C22: pF 1%, 160 V
499
7 12 C23 . . . C34: nF 1%, 63 V
60.4
PAGE2 Fascicle VI.5 - Rec. Q.552
HF-chokes, ferrite rod
1 2 L1 . . . L2: 47 mH 5%, Ro 1.1
ohm
Fascicle VI.5 - Rec. Q.552 PAGE1
PAGE2 Fascicle VI.5 - Rec. Q.552