The quality of radio reception that you will receive on the Sony SRF-18 AM/FM Stereo Portable Radio at any given time is dependent on a multitude of environmental factors, seasonal conditions, astronomical occurrences, principles of radio propagation, the laws of physics, F.C.C. broadcasting regulations regarding broadcasting power transmissions, broadcast antenna directional polarization patterns, and circumstances that are beyond your control. Reception can change based on the time of day it is, current atmospheric conditions, the presence of sun spots, solar flares, solar storms during the daytime hours, the movement of radio waves from one part of the earth to another, nearby power lines and electrical motors near the home, the proximity of appliances that emit RF interference to your Sony SRF-18 Portable Radio, the type of material that your home or room is made of, the distance from the broadcast tower(s) to your home, the presence of mountains, hills, or skyscrapers in the neighborhood, signal strength of the broadcast station being received, and the quality of your antenna and radio receiver all play a critical part in determining the quality of radio reception in your home or outdoors. Radio reception also varies by geographical location as well. It can’t be determined in the abstract if the tuner design of any particular portable radio is responsible for the quality of radio reception that any particular customer experiences at any given time. A digitally tuned pocket stereo radio is not inherently superior in terms of radio reception performance when compared to its analog counterpart. Any portable radio tuner’s sensitivity and selectivity performance with respect to weak signal and adjacent channel reception aptitude will either thrive or dive based on the quality, electrical design, thermal design, and craftsmanship of the portable stereo’s internal tuning circuitry, built-in oscillator, signal processing, noise filters, IC micro controller unit, accurate calibration of the analog tuner, and built-in system FM/AM antennas. In most instances, a digitally tuned radio merely provides convenience to the listeners as they are able to store preset stations into memory. Customers can instantly recall their favorite radio stations and programs at the touch of a button on a digital tuner. A digitally tuned radio usually suffers less from annoying station-drift issues than an analog tuned pocket radio with a thumbwheel-style tuning knob. Accurate, clear, and drift-free radio reception for any portable radio will inevitably vary. It is not possible to give a definitive answer as to the exact distance that any particular radio broadcast can be received at any specific point of the day or night. Only a general range of broadcast reception can be estimated in terms of miles when determining if a particular broadcast is capable of being received by the Sony SRF-18 AM/FM analog Stereo Pocket Radio. FM radio signals are broadcast at a much higher altitude than AM signals. As a result, FM Band radio interference can be caused from multipath reflections of radio waves off tall buildings or nearby mountains in the neighborhood. The reception area of most FM signals can range between 40-100 miles. Under rare atmospheric conditions, referred to as Tropospheric Ducting, FM signal sky wave coverage over land or bodies of water during the very warm summer months can extend outward up to a 190-500 mile radius from a station(s) broadcast transmitter during the daytime hours. Tropospheric Ducting forecasts are rated on a weakest signal to strongest signal geographical coverage area 0-10 index scale. Please note that hilly or mountainous terrain work to defeat expanded Tropospheric Ducting FM radio wave propagation across the U.S. for the vast majority of FM Band listeners. FM coverage is much shorter than AM because FM signals travel in straight lines (line-of-sight) and have reduced interaction with the earth’s ionosphere. However, FM monaural reception offers better sound quality when compared to AM. FM mono signals are susceptible to much less interference than traditional AM radio broadcasts. FM stereo broadcasts provide high-fidelity sound quality to the target radio audience and provide the shortest reception range in any particular market on the 87.5-108 MHz frequency spectrum. AM radio stations on the 530-1710 kHz frequency band periodically reduce power at night as required by F.C.C. regulations or perform maintenance operations on the transmitter that could adversely affect reception capabilities on the Sony SRF-18 Portable Radio. It should be noted that the transmission of AM radio broadcasts in general are much longer than FM broadcasts. In the daytime, AM radio broadcasts traveling via ground wave transmission may reach listeners within a several hundred mile radius. However, at night, AM signals roaming via sky wave may travel hundreds or even thousands of miles away from the intended radio market. Long-distance or DX reception of remote AM Band radio stations is possible after sunset because of an AM broadcaster’s ability to bounce signals off the outer reaches of the earth’s atmosphere to Sony SRF-18 Pocket Radio receivers outside of the intended radio market. AM DX reception is best during the winter months and is at its lowest point of performance in the summer. A Sony SRF-18 Pocket Radio always incorporates an internal ferrite bar antenna to bolster this unit’s AM Band reception capability of strong signal or Clear Channel 50,000 Watt Stations. FM Band reception can be enhanced on the Sony SRF-18 Portable Radio by extending the telescopic whip antenna to achieve full quieting results, when necessary. An examination of the various sources of radio interference is an important subject as it pertains to the Sony SRF-18 Portable Radio’s overall day-to-day performance. Typically, most sources of radio interference come from entertainment devices within the home that emit RF or radio frequency waves. In addition, radio interference may be caused by phenomenon occurring outside the home, in the immediate surrounding area of your home, deteriorating atmospheric conditions, and/or interference from adjacent broadcast frequencies on the FM Band. Listeners typically experience interference from nearby electronic equipment in their home from such items as computers, cordless telephones, microwave ovens, cellular telephones, televisions, stereo systems, compact disc players, electric power tools, and everyday household appliances. RF interference can be caused from lighting equipment, metal objects, close by ham radio operators, and nearby radio and TV broadcasting equipment. A competing broadcast station that is adjacent to the station being listened to will occasionally bleed into the currently tuned station to degrade reception opportunities as well. Personally, I have not experienced any station-drift issues, sound dropouts, or signal overload noise distortion on this wonderful Sony SRF-18 Pocket Radio thanks to its advanced state-of-the-art exclusively Sony engineered analog tuning circuitry. The Sony SRF-18 AM/FM Pocket Radio pulls in local and long distance radio stations on either broadcast band accurately, superbly, and effortlessly when called upon to. The Sony SRF-18 Portable Radio’s analog AM Band Tuner can receive the following station frequencies in the New York City Metropolitan area: 570, 620, 660, 710, 770, 820, 880, 930, 970, 1010, 1050, 1130, 1190, 1280, 1330, 1380, 1430, 1480, 1560, 1600, 1660 kHz. The Sony SRF-18 Portable Radio’s analog FM Band Tuner can receive the following station frequencies in the New York City Metropolitan area: 88.3, 88.9, 89.1, 89.5, 89.9, 90.7, 91.1, 91.5, 92.3, 93.1, 93.5, 93.9, 94.7, 95.5, 96.3, 96.7, 97.1, 97.9, 98.3, 98.7, 99.5, 100.3, 100.7, 101.1, 101.9, 102.7, 103.5, 104.3, 105.1, 105.9, 106.7, 107.5 MHz. Of course, your receivable FM/AM station results will vary by your particular geographic destination or local radio market. Strong signal AM Band stations can be found from the far left side of the tuning dial to the center position of the tuning dial. Weak signal AM Band Stations are located from the center dial position to the extreme right side of the tuning dial. The Sony SRF-18 Speaker Dock is capable of receiving the following classes of AM/FM radio stations in the United States as licensed by the F.C.C.: For the AM Band: Class A: 10,000 Watts-50,000 Watts broadcast transmission power, Class B: 250 Watts-50,000 Watts broadcast transmissions power, Class C: 250 Watts-1,000 Watts broadcast transmissions power, and Class D: 250 Watts-50,000 Watts broadcast transmissions power. For the FM Band: Class A: 6,000 Watts maximum broadcast transmission power-Maximum Antenna Height 328 ft., Class B1: 25,000 Watts maximum broadcast transmissions power-Maximum Antenna Height: 328 ft., Class B: 50,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 492 ft., Class C3: 25,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 328 ft., Class C2: 50,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 492 ft., Class C1: 100,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 981 ft., Class C0: 100,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 1476 ft., and Class C: 100,000 Watts maximum broadcast transmissions power-Maximum Antenna Height 1969 ft. Receivable AM/FM radio stations are categorized as commercial or non-commercial. Low-powered college radio stations located on the FM Band in NY can offer as few as 11 Watts of transmission power within a particular radio market. High-powered college radio broadcasts can offer up to 46,000 Watts of transmission power on the FM dial. The Sony SRF-18 Pocket Radio is capable of receiving unlicensed (Part 15 F.C.C. Rules) FM radio stations such as those broadcast at a small college, local gym, or in a multiple unit dwelling.
Posted on: Fri, 18 Oct 2013 19:18:57 +0000
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