Field Sweeping with the SDA-5000: Considerations for Sweep in the Field
73
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problem, but an artifact of the type of test point used and impedance
mismatches in the network.
If the video carriers at the forward test point are above +20dBmV, then use a
pad to drop the levels. (Typically this will be the case only when there are
direct connections to an amplifier output.)
Fig. 4-7 SDA-5000 Connection in a Network with One Bi-directional Test
Point
• Dual cable networks: Dual cable networks are a second type of
forward/reverse network. Although this is a less common configuration, it
can also be swept in both directions.
Two separate pieces of coax are run to all points in the network. One is used
for forward path signals, the other for reverse path signals. This type of
network is more expensive to build, but it offers more return bandwidth.
Two cables can be used to sweep this type of system in both directions with
the same setup. A sample setup is shown in Fig. 4-9.
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