null position

null position

null positionclick for a larger image
The position of an ADF (automatic direction finder) loop antenna when the signal being received is canceled in the two sides of the loop, and the signal strength is the weakest. At this position, the transmitting station lies in line with the direction of the loop—either ahead or to the rear. A sense aerial is used to remove this ambiguity.
References in periodicals archive ?
The aim of this study was to show whether using the null position on the EVD provides adequate inter-hour trending of a patient's ICP.
No conclusive evidence was found regarding the use of the null position in relation to trending patients' ICPs.
It can be seen from Figure 9(b) that the null position of the best result obtained by QPSO in [14] is not accurate.
j] the specified null angle value, and [PSI] the set of all the null positions.
Emphasizing that it is time for Arab youth to speak up on this issue, Fakhri explained "decision-makers in the region have always had a null position and this is not acceptable for us, especially as youth whose futures are jeopardized by the problems that this climate catastrophe causes.
The number of nulls doubles and the 20dB power point drops when the operating frequency is doubled and the pattern of the null position is aperiodic.
Assuming the height of the antenna may vary in a real world sensor network, a simulation has been carried out to observe the effects on the null position when the antenna height is altered.
After completing the task, the spool will be brought back to null position causing the shaft to not to rotate.
This makes an LVDT perform well as a null position sensor in closed-loop control systems and high-performance servo balance instruments.
As the probe slides away from a null position, the voltage can be seen increasing to a peak before decreasing to zero again at the next null.
And, because an LVDT typically has no end position stops, the null position, located in the middle of the range of motion of the LVDT's core, is the "stake in the ground" for determining core position and is always specified on an LVDT data sheet.
After element failure the radiation pattern is destroyed, which results in increase of the SLL and displacement of null positions.