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Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism .
CQ Amateur Radio United States: English Monthly 1945–2023 National Communications Magazine United States: English Bimonthly 1988-present CQ VHF Magazine United States: English Quarterly 1996–2013 Electronics Illustrated United States: English Monthly 1959–1961 ham radio United States: English Monthly 1968–1990 K9YA Telegraph United States
The AN/ART-13 is used today by ham radio operators interested in restoring and operating historic military gear. [2] It is often paired with a BC-348 military receiver of World War II vintage or the later AN/ARR-15 autotuned receiver of postwar vintage.
The use of "ham" meaning "amateurish or unskilled" survives today sparsely in other disciplines (e.g. "ham actor"). The amateur radio community subsequently began to reclaim the word as a label of pride, [15] and by the mid-20th century it had lost its pejorative meaning. Although not an acronym or initialism, it is often written as "HAM" in ...
The company was founded in 1943 by radio design engineer Robert L. Drake. The company began as a manufacturer of low pass and high pass filters for the government and amateur radio market, and after World War II, produced amateur radio transmitters and receivers and communications receivers for maritime mobile service.
Image credits: Detroit Photograph Company Even though the autochrome was patented in 1903, that doesn't mean that it was readily available to the public. "Only affluent amateur photographers were ...
Such operating events are not traditional ham radio contests inasmuch as they are a night of friendly QSO’s using home-built, restored commercial ham, broadcast or military equipment. [20] The Antique Radio Club of Illinois operates a vintage radio station as a public demonstration at the Antique RadioFest allowing licensed amateurs who visit ...
Voyager 1 relays messages to NASA’s mission control team after losing contact due to a technical issue. The aging spacecraft is relying on an old radio transmitter.