| R |
|
|
|
| R |
|
Symbol for resistance |
|
| Radio Frequency (RF) |
|
Radio-Frequency. Usually considered to be frequencies ranging
from 1㎒ TO 3㎓. |
|
| Range |
|
Number of sizes of connectors or cables of a particular type. |
|
| Receptacle |
|
Usually the fixed or stationary half of a two-piece multiple
contact connector.
Also the connector half usually mounted on a panel and containing
socket contacts. |
|
| Reflection |
|
The change in direction (or return) of waves striking a surface.
For example,
electromagnetic energy reflections can occur at an impedance
mismatch in a
transmission line, causing standing waves. |
|
| Reflection Loss |
|
The part of signal that is lost due to reflection of power
at a line discontinuity. |
|
| Reflow Soldering |
|
The process of screenprinting solder paste and then heating
it to cause is to melt, or reflow , to wet the leads and pads
around it. |
|
| Repeater |
|
A receiver and transmitter combination used to regenerate
an attenuated signal. |
|
| Resistance |
|
In dc circuits, the apposition a material offers to current
flow, measured in ohms. In ac circuits, resistance is the real
component of impedance, and may be higher than the value measured
at dc. |
|
| RF |
|
Abbreviation for radio frequency. |
|
| RGB |
|
Abbreviation for the three parts of color video signal: red,
green and blue, and also refers to multi-coaxial cables carrying
these signals. |
|
| RG/U |
|
Symbol used to designate coaxial cables that are made to Government
Specification (e.g., RG-58U; in this designation the R means
radio frequency, the G means Government,
the 58 is the number assigned to the goverment approval, and
the U means it is an universal specification). |
|
| rms |
|
Abbreviation for root mean square. |
|
| Rubber (Wire Insulation) |
|
A general term used to describe wire insulations of thermosetting
elastomers,
such as natural or synthetic rubbers: neoprene, Hypalonⓡ, butyl
rubber, and others. |
|
