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46
IBM 8265: Planning and Site Preparation Guide
Each actual reflection coefficient, p(shorted cable) and p(open cable), is converted to
an impedance using the following equation:
( )
×
(
Z b
(
)
Z actual
=
--------------------------------------------------------------
(
1 p actual
–
Where:
Z(b)
output impedance of balun
The cable impedance is then calculated using the equation:
2
( )
(
)
×
Z 0
Z open
=
Note: Characteristic impedance measurements are performed on 305 m (or greater)
reels at 25° ± 3°C, 10 percent tolerance, unless otherwise noted.
Frequency
9.6 kHz
38.4 kHz
3 MHz–20 MHz
Notes:
1. Tolerance.
2. The specification must be met over the entire frequency range specified.
(
)
)
1 p actual
+
(
)
)
(
)
Z short
Type 1A
270
185
150 (2)
Type 9A
390 (1)
235 (1)
150 (2)
Type 6A
390 (1)
235 (1)
150 (2)
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