Antex electronic SX-36, SX-6, SX-34, SX-5e user manual Appendix, Connectors for Male Headers, Terms

APPENDIX

Connectors for Male Headers

For connecting to the auxiliary connectors on the Antex Card, there are 2 types of connectors to use. One type is the individual crimp type, such as the Molex C-Grid series. For single row headers, the part number would be 50-57-900X, where X is the number of contacts. For dual row headers, the part number would be 22-55-2XX1, where XX is the number of contacts. The crimp contacts are ordered separately, 16-02-0103. These parts are available from Digi-Key, www.digikey.com.

These connectors are high profile and may interfere with the card in the adjacent slot. Another alternative for the dual row headers is to use insulation displacement ribbon cable connectors. (This is the type of cable that connects to your hard drive.) These are lower profile, but the ribbon cable wires are fairly delicate. The ribbon cable was designed for insulation displacement termination only, not for stripping and soldering. This will work, however, if the ribbon cable is immobilized so that the solder joints will not be flexed. Ribbon cables are also available from Digi-Key.

Terms

Decibels

A decibel or “dB” is a relative logarithmic measurement. It is de- fined as:

dB = 20 x log (Voltage/Reference Voltage)

The reference voltage is referred to as the “zero dB point”. A sig- nal 10 times greater in voltage is 20 dB higher. A signal 2 times greater is 6 dB higher. dBu measurements use .775 volts RMS as the reference. This is similar to dBm, which is based upon 1

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