Shortwave radio

Shortwave radio is radio transmission using shortwave frequencies, generally 1.6–30 MHz (187.4–10.0 m), just above the medium wave AM broadcast band.

Shortwave radio is used for long distance communication by means of skywave or skip propagation, in which the radio waves are reflected or refracted back to Earth from the ionosphere, allowing communication around the curve of the Earth. Shortwave radio is used for broadcasting of voice and music, and long-distance communication to ships and aircraft, or to remote areas out of reach of wired communication or other radio services. Additionally, it is used for two-way international communication by amateur radio enthusiasts for hobby, educational and emergency purposes.

Frequency classifications

The widest popular definition of the shortwave frequency interval is the ITU Region 1 (EU+Africa+Russia...) definition, and is the span 1.6–30 MHz, just above the medium wave band, which ends approximately at 1.6 MHz.

There are also other definitions of the shortwave frequency interval:

David

David (/ˈdeɪvɪd/; Hebrew: דָּוִד, Modern David, Tiberian Dāwîḏ;ISO 259-3 Dawid; Arabic: داوُد‎ Dāwūd; Syriac: ܕܘܝܕ‎ Dawid; Ancient Greek: Δαυίδ; Latin: Davidus, David; Strong's: Daveed) was, according to the Books of Samuel, the second king of the United Kingdom of Israel, and according to the New Testament, an ancestor of Jesus. His life is conventionally dated to c. 1040 – 970 BCE, his reign over Judah c. 1010–970 BCE.

The Books of Samuel, 1 Kings, and 1 Chronicles are the only Old Testament sources of information on David, although the Tel Dan Stele (dated c. 850–835 BCE) contains the phrase בית דוד (bytdwd), read as "House of David", which many scholars confirm to be a likely plausible match to the existence in the mid-9th century BCE of a Judean royal dynasty called the House of David.

Depicted as a valorous warrior of great renown, and a poet and musician credited for composing much of the psalms contained in the Book of Psalms, King David is widely viewed as a righteous and effective king in battle and civil justice. He is described as a man after God's own heart in 1 Samuel 13:14 and Acts 13:22.

AM

AM or similar may refer to:

Timekeeping

Technology

Science and education

Sunday Morning

Sunday Morning or Sunday Mornin' may refer to:

Albums

Songs

Jesus

Jesus (/ˈdʒiːzəs/; Greek: Ἰησοῦς Iesous; 7–2 BC to AD 30–33), also referred to as Jesus of Nazareth or Jesus Christ, is the central figure of Christianity, whom the teachings of most Christian denominations hold to be the Son of God. Christians believe Jesus is the awaited Messiah (or Christ, the Anointed One) of the Old Testament.

Virtually all modern scholars of antiquity agree that Jesus existed historically, and historians consider the Synoptic Gospels (Matthew, Mark and Luke) to be the best sources for investigating the historical Jesus. Most scholars agree that Jesus was a Galilean, Jewish rabbi who preached his message orally,was baptized by John the Baptist, and was crucified by the order of the Roman Prefect Pontius Pilate. In the current mainstream view, Jesus was an apocalyptic preacher and the founder of a renewal movement within Judaism, although some prominent scholars argue that he was not apocalyptic. After Jesus' death, his followers believed he was resurrected, and the community they formed eventually became the Christian church. The widely used calendar era, abbreviated as "AD" from the Latin "Anno Domini" ("in the year of our Lord") or sometimes as "CE", is based on the birth of Jesus. His birth is celebrated annually on December 25 as a holiday known as Christmas.