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Connectors: Difference between revisions
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==UHF== | ==UHF== | ||
The UHF connector is | The '''"[http://en.wikipedia.org/wiki/UHF_connector UHF connector]"''' is coaxial connector developed prior to WWII | ||
with a screw-on shield. The male is often called a PL-259, and the female is often called an SO-239. | as a [[Connectors#Banana|banana]] connector with a screw-on shield. The male is often called a PL-259, and the | ||
female is often called an SO-239, following the old Signal Corps nomenclature. | |||
Although it is called a "UHF" connector, the connector's construction | Although it is called a "UHF" connector, the connector's construction does not provide for constant | ||
a | impedance - it drops to 30-40 Ω for about a centimeter in the central region of the connector, which | ||
Manufacturers usually specify this connector as | means they create significant electrical signal reflections above 150 MHz. Consequently, | ||
Manufacturers usually specify this connector as suitable for use up to 200 or 300 MHz only. | |||
UHF sockets are used on many pieces of early Tektronix gear, initially having the advantage that | |||
initially having the advantage that 4 mm (banana) plugs as used on earlier equipment could | 4 mm (banana) plugs as used on earlier equipment could be inserted directly. | ||
be inserted directly. | |||
Like other test equipment manufacturers, Tektronix moved away from UHF connectors in the mid-1960s | Like other test equipment manufacturers, Tektronix moved away from UHF connectors in the mid-1960s. | ||
Tek provided kits that allowed owners or field technicians to convert instruments from UHF connectors | Tek provided kits that allowed owners or field technicians to convert instruments from UHF connectors | ||
to [[Connectors#BNC|BNC connectors]], which are smaller, quicker to attach and remove, and have | to [[Connectors#BNC|BNC connectors]], which are smaller, quicker to attach and remove, and have | ||
better high-frequency characteristics (controlled impedance). | better high-frequency characteristics (controlled impedance). | ||
Contemporary use of UHF connectors is limited | Contemporary use of UHF connectors is limited to niches like ham radio or marine radio gear, where | ||
they are still popular for ease of assembly. | |||
The UHF connector is used in the [[511]], [[512]], [[513]], [[514]], [[515]], [[516]], [[517]], | The UHF connector is used in the [[511]], [[512]], [[513]], [[514]], [[515]], [[516]], [[517]], | ||