Galaxy DX 29HP Owner's Manual

Contents

Galaxy DX 29HP Owner's Manual Manual pdf 4 page image

IGNITION NOISE INTERFERENCEUse of a mobile receiver at low signal levels is normally limited by thepresence of electrical noise. The primary source of noise in automobile installationsis from the generator and ignition system in the vehicle. Under most operatingconditions, when signal level is adequate, the background noise does not present aserious problem. Also, when extremely low level signals are being received, thetransceiver may be operated with vehicle engine turned off. The unit requires verylittle current and therefore will not significantly discharge the vehicle battery.Even though the transceiver has ANL and NB controls, in same installationsignition interference may be high enough to make good communicationsimpossible. The electrical noise may come from several sources. Many possibilitiesexist and variations between vehicles require different solutions to reduce the noise.ANTENNAA vertically polarized, quarter-wavelength whip antenna provides the mostreliable operation and greatest range. Shorter, loaded-type whip antennas are moreattractive, compact and adequate for applications where the maximum possibledistance is not required. Also, the loaded whips do not present the problems ofheight imposed by a full quarter-wavelength whip.Mobile whip antennas utilize the metal body of the vehicle as a ground plane.When mounted at a corner of the vehicle they are slightly directional, in thedirection of the body of the vehicle. For all practical purpose, however, theradiation pattern is nondirectional. The slight directional characteristic will beobserved only at extreme distance. A standard antenna connector (type SO239) isprovided on the transceiver for easy connection to a standard PL 259 cabletermination.If the transceiver is not mounted on a metal surface, it is necessary to run aseparate ground wire from the unit to a good metal electrical ground in the vehicle.When installed in a boat, the transceiver will not operate at maximum efficiencywithout a ground plate, unless the vessel has a steel hull.Before installing the transceiver in a boat, consult your dealer for informationregarding an adequate grounding system and prevention of electrolysis betweenfittings in the hull and water.If you are having difficulties in adjusting your antenna, check the following:A. All doors must be closed when adjusting the antenna.B. Make sure the antenna base is grounded.C. Check your coaxial cable routing (it may be pinched when routed into thecar).D. Try a different location on your car (keeping in mind the radiation patternyou wish)E. Is the antenna perfectly vertical?F. Try a different location in your neighborhood. Stay away from largemetal objects when adjusting (metal telephone or light posts, fences, etc.).EXTERNAL SPEAKERThe external speaker jack (EXT.SPK) on the rear panel is used for remotereceiver monitoring. The external speaker should have 8 ohms impedance and beable to handle at least 4 watts. When the external speaker is plugged in, the internalspeaker is disconnected.THE PROPER SETTING IS ACHIEVED WHEN THE SWR IS1.5 OR BELOW, AND WHEN IT HAS THE SAME READINGFOR CHANNELS LOW BAND A1 AND HI BAND D40.The transceiver will operate into an SWR of 2 to 1 indefinitelyand sustain an SWR of 20:1 for a maximum of 5 minutes at ratedoperating conditions.- 5 -NOTE- 6 -NOTE