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UHF: 150 kW analog video; 15 kW digital The class-A television class is a variant of LPTV created in 2000 by the FCC to allocate and protect some low-power affiliates. Class-A stations are still low-power, but are protected from RF interference and from having to change channel should a full-service station request that channel.
In the days when CB required a license, some low-powered or toy walkie-talkies were exempt because they operated within Part 15. However, in 1976, the FCC phased in a shift of these 100 mW [12] devices to the 49 MHz band, with operation on the CB frequencies to cease in 1983. [13]
A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. The term usually refers to a type of radio-frequency (RF) power amplifier , some of which have output power measured in kilowatts , and are used in amateur radio .
After the 1973 oil crisis, the U.S. government imposed a nationwide 55 mph speed limit, and fuel shortages and rationing were widespread.Drivers (especially commercial truckers) used CB radios to locate service stations with better supplies of fuel, to notify other drivers of speed traps, and to organize blockades and convoys in a 1974 strike protesting the new speed limit and other trucking ...
CB was, and still is, designed for short-distance (local) communications needs. US FCC law prohibits communicating with any station more than 250 km (155.3 miles) on CB frequencies.(150-mile rule deleted by FCC September 2017) Like many rules regarding the HF CB services, the distance prohibition is largely ignored and unenforced. Often as a ...
KALV-FM (101.5 MHz, "Live 101-5") is a commercial radio station in Phoenix, Arizona. It is owned by Audacy, Inc. and it airs a top 40 (CHR) format . KALV-FM's studios are located in downtown Phoenix, and its transmitter is in South Mountain Park .
The klystron and TWT are linear devices and so, in principle, could be used as receiver preamplifiers. However, the klystron was quite unsuitable as it was a narrow-band device and extremely noisy [ 21 ] : 392 and the TWT, although potentially more suitable, [ 21 ] : 548 has poor matching characteristics and large bulk, which made it unsuitable ...
The second amplifier released was the Phase Linear 400 with 200 watts per channel. It shared the same distinctive brushed aluminum, dual VU meters front panel style as the 700. It retailed for just under $500. [1] The next product was the Phase Linear 4000 Series Auto-correlation Pre-Amplifier introduced in 1973 and manufactured through 1978.