SG-235 Smartuner - SGC

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SG-235 Manuala conventional Vee antenna as an inverted Vee. The coupler is very flexiblein this regard.4.1 Antenna SelectionThe automatic antenna tuner will operate into almost any end fed antennawith a length of 2.5 meters or more, provided an effective ground is used.The antenna efficiency will be proportional to length and in most applicationswill be maximum at a length of 1/4 wavelength. This means that thelongest possible antenna should be selected for each installation.Very short antennas are only recommended when there is no other alternativesuch as in a vehicular mobile installation. The performance of shortwhip antennas is usually very poor, particularly at the lower frequencies,and radiation efficiency will be only a few percent of a full sized antenna.However, a special electrically long antenna such as the SG-303 9 ft. mobileantenna overcomes much of the radiation problem.4.2 Whip Antennas - 2.5-3.0 meters (8-9 ft)This antenna is recommended only for vehicular mobile installations. Theshort length will result in poorer performance when compared with thelonger antennas. A special high performance 9 foot antenna, the SG-303, ismanufactured by SGC specifically for this problem. The SG-303 is SGC PartNumber 55-27.4.3 Whip Antenna - 7.0 to 8.5 Meter (28 ft)This antenna is recommended for marine installation on smaller vessels. Itmay also be used in base stations if there is no way of using a longer antenna.The SG-203 is this type of antenna. Order SGC Part Number 55-23.4.5 Longwire Antenna -23 meter (75 ft) and 46 meter (150 ft)For most applications the longwire antenna will give the best results and isrecommended when practical. The diagrams at the end of this section showsome recommended methods of installation. These are only a few of themany possible methods of installation and frequently a different configurationwill be the best at a particular site. SGC's long wire antenna, 60 feet inlength, provides efficient operation on low frequencies and high frequenciesalike. Order SGC Part Number 55-10.20© 1998 SGC IncSGC 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.com
SG-235 ManualAntenna Length vs. Lowest Tunable FrequencyAntenna Lengthin Feet (approximate)Lowest Frequencyin KHz350 feet 1650 KHz335 feet 1700 KHz315 feet 1800 KHz285 feet 1900 KHz275 feet 1950 KHz220 feet 2000 KHz100 feet 2500 KHz50 feet 3000 KHz4.6 Backstay Antennas -8 meters (28 ft) and longerAlthough we would love to sell everyone a high performance marine whipantenna, the backstay of a sailboat is almost impossible to improve upon inmost installations.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.com21© 1998 SGC Inc
Page 1: SG-235Smartuner®Microprocessor Con
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Page 8 and 9: SG-235 Manual1.0 General Informatio
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Page 18 and 19: SG-235 Manualdetail. If you are dea
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Page 24 and 25: SG-235 ManualFigure 5.05Base instal
Page 26 and 27: SG-235 Manualup to 300 feetBalanced
Page 28 and 29: SG-235 ManualThe insulated backstay
Page 30 and 31: SG-235 ManualAn End fed antenna cou
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Page 36 and 37: SG-235 ManualSG-235 coupler is spec
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Page 40 and 41: SG-235 Manualand should be installe
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Page 58 and 59: SG-235 Manualtests and appropriate
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Appendix - QMS SystemAppendixÑ QMS
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Appendix - QMS System4. When connec
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Appendix - QMS System2. Insure that
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Appendix - QMS SystemU s e o f t h
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Appendix - QMS System¥ To make rem
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© August, 1997 SGC, Inc.The QMS An
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© Copyright October, 1997 SGC, Inc
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SG-235500 watt Smartuner Automatic
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SG-235 Smartuner - SGC

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