lowest-useful frequency - ορισμός. Τι είναι το lowest-useful frequency
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Τι (ποιος) είναι lowest-useful frequency - ορισμός

RADIO TRANSMISSION TERM
Lowest usable frequency

Useful idiot         
DEROGATORY TERM FOR A PERSON PERCEIVED TO PROPAGANDIZE FOR A CAUSE WITHOUT FULLY COMPREHENDING THE CAUSE'S GOALS
Useful Idiots; Useful Idiot; Useful idiots; Poleznye idioty; Useful idiots of the West; Useful innocents; Useful innocent; Idiotarian; Useful fool; Useful fools; Korisne Budale; Idiots utiles; Idiot utile; Polezniye duraki; Polezni durak; Unwitting agent
In political jargon, a useful idiot is a term for a person perceived as propagandizing for a cause -- particularly a bad cause originating from a devious, ruthless source -- without fully comprehending the cause's goals, and who is cynically used by the cause's leaders. The term was originally used during the Cold War to describe non-communists regarded as susceptible to communist propaganda and manipulation.
Lowest usable high frequency         
The lowest usable high frequency (LUF), in radio transmission, is a frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g.
Frequencies         
  • Diagram of the relationship between the different types of frequency and other wave properties.
  • Complete spectrum of [[electromagnetic radiation]] with the visible portion highlighted
  • Modern frequency counter
  • Hz]]
  • The [[sound wave]] spectrum, with rough guide of some applications
NUMBER OF OCCURRENCES OR CYCLES PER TIME
Wave period; Frequencies; Period (physics); Frequency (wave motion); Frequency dependence; Oscillation frequency; Frekvens; Periodic time; Frequency measurement; Period (frequency); Temporal frequency; Repetition frequency; Occurrence frequency; Event frequency; Oscillation rate; Repetition rate; Occurrence rate; Event rate; Rate of occurrence; Rate of repetition; Rate of oscillation; Wave frequency; Ordinary frequency; Aperiodic frequency
·pl of Frequency.

Βικιπαίδεια

Lowest usable high frequency

The lowest usable high frequency (LUF), in radio transmission, is a frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month. Any frequency lower than this is not able to fulfill those requirements, while higher frequencies usually yield better result until the maximum usable frequency is reached. The amount of energy absorbed by the lower regions of the ionosphere (D region, primarily) directly impacts the LUF.