The article is devoted cable connectors that are most often used for radio and navigation devices.
The most common coaxial RF connectors
American Standard, the most widespread in professional and cellular radio.
Screening of more than 90 dB;
Intermodulyatsionnh noise level - more than 155 dBm. VSWR:
For direct connector - no more than 1.12 at frequencies up to 18 GHz
For corner connectors - no more than 1.22 at frequencies up to 5 GHz.
Mostly connectors of this type are used by 50 ohms, but there is also an option 75 ohms. N channel 75 ohm is rarely used and has a thin inner conductor (2 mm) than the connector 50. In practice, it is recommended to use this channel to the flexible cable (with an external conductor - braid) and cables up to 12 mm shell with an external conductor in the form of foil. When using N- channel thicker and rigid cables may happen mechanical damage to the internal connector pins. Operating frequency range in a given connector - up to 18 GHz.
TNC connector and BNC
Connectors BNC and TNC have the same characteristics and are separated only way junction:
Connector TNC - Screwed 'fork' with 'rosette'.
Connector BNC - bayonet 'fork' with 'rosette'.
Working range of TNC connector Set - up to 11 GHz, connector BNC - up to 3 GHz.
Shielding - not less than 60 dB. VSWR: To TNC - not more than 1.3 at 11 GHz .; For BNC - about 1.25 at frequencies up to 3 GHz
Braid and center conductor of the coaxial cable can be fixed in BNC- and TNC-connectors of different design in three ways: as a solder and wrap a crimp on the cable connector parts.
The shape of the connectors are straight and angled.
Connectors are used in measuring, low-power communications equipment (up to 50 W), as well as in home appliances (TV, radio, etc.).
Series - UHF
Type the central contact - Pin
Mark applied cable - RG-58
Impedance - 50 Ohm
Installation of the central contact - Soldering
Method of attachment - wrap on the cable
Connector UHF (plug), in accordance with the military list, commonly referred to as PL-259. UHF connectors have threaded coupling and are characterized by impermanence impedance. Therefore their use is limited to frequencies up to 300 MHz. UHF connectors are classified as low-cost and are mainly used for communications equipment low-frequency bands (CB).
DB-9F (connector for serial port COM)
The resistance of the insulator at least 1,000 MW
Withstand voltage of not less than 1000 V AC for 1 min.
Contact resistance less than 0.1Om
The maximum current 5A
The most common serial port of PCs using a standard RS-232C. The navigation equipment is port type DB-9F. This connector is used for programming the equipment, or where the data transfer is required.