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1
Connecting User
Inputs To
E1474A/75A
Cabling Guidelines
1
E.F. Johnson Co., 299 Johnson Ave, Waseca, MN 56093-0514. Telephone: 1-800-247-8256,
FAX : 1-507-835-6287
24 Configuring the RF Multiplexer
User inputs to the RF Multiplexer and Expander modules are via user-supplied
female 75 Ohm SMB connectors to the male 75 Ohm SMB connectors on the
modules. Figure 2-6 shows the RF Multiplexer 75 Ohm SMB connectors and
associated channel numbers.
• The 75 Ohm connectors only work with one braided shield or one braid and
a foil wrap.
• Always use shielded coaxial cables with the characteristic impedance of 75
Ohms. Keep cables as short as possible, especially in high-frequency
circuits or pulse circuits where a rise/fall time is critical.
• Long cables can add delay time which can cause timing problems. All test
equipment, such as counters, spectrum analyzers, and oscilloscopes must be
terminated in the characteristic impedance (75 Ohms) to minimize reflection
loss.
• The 75 Ohm SMB connectors are significantly different than the
standard 50 Ohm SMB connectors. Carefully plug the connectors in
and out to minimize damage to the connector. The 75 Ohm SMB mating
connectors and accessories are available only from Hewlett-Packard or E.F.
1
Johnson Co.
• Refer to Cabling Connection Examples 1 and 2 for information on
connectors and accessories.
Figure 2-8. 75 Ohm SMB Connector Locations
Chapter 2
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