SG-235 Smartuner - SGC

SG-235 Manual2. The antenna should be kept as far away as possible from buildings,trees and vegetation. If metallic masts or supports are used, arrangethe insulators so the antenna is spaced at least 2 meters from the mast.3. Remember that the radiating part of the antenna starts at the tuner.The location of the bottom portion of the antenna is very important.4. Vertical antennas have an omni-directional radiation pattern andwill provide equal performance in all directions.5. Horizontal wire antennas have maximum radiation broadside to theantenna when the frequency is less than 1/4 wavelength. As thefrequency increases beyond 1/4 wavelength, lobes will appear in theradiation pattern with the principal lobes becoming closer to theplane of the antenna as the length increases. At all times, radiationwill be minimal at the end of the antenna and should be located sothe ends point in directions where communications are not required.6. The "V" construction minimizes the directivity of the horizontalantenna and is recommended for all around coverage. In addition,the "V" antenna is a compromise between vertical and horizontalpolarization and will give good results for communications with landor marine mobiles using vertical whip antennas.7. High voltages (sometimes exceeding 30,000V RF) are present on theantenna. All parts of the antenna and tuner must be located orprotected so that there is no possibility of accidental contact.8. Do not locate the antenna close to other antenna systems.9. Make sure that the antenna is rigidly supported. The antenna willdetune if it sags or sways.10. The connection from the tuner to the ground must be a smallpercentage of the total length of the antenna. Do not let the length ofthe ground strap exceed 1 meter. Use heavy gauge wire or strap forground connection.11. Whip antennas should be connected with the minimum length of wire.(Do exceed 0.6 meters).12. Do not locate the tuner farther from the transceiver than necessary. Ifthe distance exceeds 10 meters (30 ft) , it is recommended that low losscoaxial cable, such as RG-8 or RG-213 be used.SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USAP.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331E-mail: sgc@sgcworld.com Web site: http://www.sgcworld.com37© 1998 SGC Inc