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A plain-language radio check is the means of requesting and giving a signal strength and readability report for radiotelephony (voice) communications, and is the direct equivalent to the QSA and QRK code used to give the same report in radiotelegraph communications.
A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment. These report ...
A time-domain reflectometer; an instrument used to locate the position of faults on lines from the time taken for a reflected wave to return from the discontinuity.. A signal travelling along an electrical transmission line will be partly, or wholly, reflected back in the opposite direction when the travelling signal encounters a discontinuity in the characteristic impedance of the line, or if ...
Weak signal strength can also be caused by destructive interference of the signals from local towers in urban areas, or by the construction materials used in some buildings causing significant attenuation of signal strength. Large buildings such as warehouses, hospitals and factories often have no usable signal further than a few metres from ...
Signal Weak Unable to copy - change location Unreadable 10-2 Receiving well. Signals good Signal Good — 10-3 Stop transmitting. Disregard last information Stop transmitting Stop Transmitting 10-4 Acknowledgement. Message received Acknowledgement Affirmative (Ok) Roger Roger/ Affirmative 10-5 Relay. Relay (To) Relay 10-6 Busy. Busy, stand by
Because damage to the cable can cause reflections, an instrument called an electrical time-domain reflectometer (ETDR; for electrical cables) or an optical time-domain reflectometer (OTDR; for optical cables) can be used to locate the damaged part of a cable. These instruments work by sending a short pulsed signal into the cable and measuring ...
The significance of local geographical conditions cannot be over emphasised and this was underlined by an experiment which revealed the signal reception conditions around a typical house. The site did not have the critical "line-of-sight propagation" to the transmitter. Average signal levels, taken at the same height, varied by up to 6 dB, and ...
Line signaling is a class of telecommunications signaling protocols. [1] Line signaling is responsible for off-hook , ringing signal , answer, ground start , on-hook unidirectional supervision messaging in each direction from calling party to called party and vice versa.