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modulated signal is recovered from the 455 kHz I-F signal in (Block 2) The audio signal is amplified to drive a speaker in (Block 1), see Figure 12-2 The 6N2 receiver specifications are illustrated in Table 12-1 So you ask, why dual conversion To answer this question, take a look at the diagram shown in Figure 12-3, and it may become more clear In order to obtain the desired intermediate frequency (I-F) signal by mixing the local oscillator with the desired radio frequency, an unwanted output may result due to a transmission spaced one intermediate frequency or (I-F) on the opposite side of the oscillator (image) By using a large I-F frequency, this image is moved further out of the band of desired frequencies The second conversion

provides the selectivity to filter out the desired narrow band transmission The 6N2 receiver operates on two of the most popular VHF amateur radio bands The 6N2 VHF amateur radio receiver receives both the 6-meter ham band and the 2-meter ham bands, and you can select the band with a band-switch To help you visualize the relationship between frequency and wavelength, take a look at the diagram shown in Figure 12-4 If the speed of a wave (meters per second) is divided by the number of waves that pass a given point (cycles per second), the seconds cancel and you obtain the wavelength = meters per cycle The speed of radio waves is approximately 300,000,000 meters per second If the frequency is 50 to 54 MHz, the wavelength becomes 300,000,000/50,000,000 or 6 meters So for the 2-meter band, which is approximately 150 MHz, the wavelength becomes 300,000,000/150,000,000 or 2 meters The actual bands are: 2-meter band which covers 144 MHz to 148 MHz, and the 6-meter band which covers 50 MHz to 54 MHz The 6N2 dual band VHF receiver is composed of four major blocks, ie blocks 1 through 4 It is a bit easier to follow how the receiver works if we break it down into smaller defined blocks, see Figure 12-5 The heart of the receiver is the integrated circuit at U1, an almost complete FM receiver on-a-chip The FM receiver chip only requires timing components, a crystal and RF tuning components, a filter The output of the FM radio chip is sent to the audio amplifier chip at U2 Power for the receiver is regulated via the regulator chip at U3

College courses required in this eld usually include technical subjects, such as surveying, landscape design and construction, landscape ecology, site design, and urban and regional planning Other courses include history of landscape architecture, plant and soil science, geology, professional practice, and general management Many landscape architecture programs are adding courses that address environmental issues Most students at the undergraduate level take a year of prerequisite courses such as English, mathematics, and social and physical science The design studio is an important aspect of many landscape architecture curriculums Whenever possible, students are assigned real projects, providing them with valuable hands-on experience While working on these projects, students become more pro cient in CAD, GIS, and video simulation In 2008, forty-nine states required landscape architects to be licensed or registered Licensing is based on the Landscape Architect Registration Examination (LARE), sponsored by the Council of Landscape Architectural Registration Boards (CLARB) and administered over a three-day period Exam admission usually requires a degree from an accredited school plus one to four years of work experience, though standards vary from state to state Currently, fteen states require the passage of a state examination in addition to the LARE to satisfy registration requirements State examinations, which are usually one hour and completed at the end of the LARE, focus on laws, environmental regulations, plants, soils, climate, and any other characteristics unique to the state Because state requirements for licensure are not uniform, landscape architects may not nd it easy to transfer their registration from one state to another However, those who meet the national standards of graduating from an accredited program, serving three years of internship under the supervision of a registered landscape architect, and passing the LARE can satisfy most states requirements Through these means, a landscape architect can obtain CLARB certi cation and gain reciprocity in other states In the federal government, candidates for entry positions should have a bachelor s or master s degree in landscape architecture Unlike state requirements, the federal government does not require its landscape architects to be licensed.

Table 12-1