Making the most of your receiver Eddystone Stratton VK7AG 0008
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r with the propa- - daylight in mid- to produce good od entertainment ntacts to be made es fade out... This lower frequencies” ir sun-spot cycle’. 30 Mc/s and even ine will be noticed Range |, you will advice generally ar of other wires proper must not in a high wind— aerial, which may It should be well rough a deck or sults, particularly band. But it will te a short aerial, < up interference rranging adequate be overcome by » elsewhere. The al wire, insulators putting into use fty feet of feeder ed feet of feeder, igth of feeder, it tion. The longer > a surplus exists, it roll and stowed further insulation ted in the drawing) S can occur. — is necessary at the point of lead-in. In some cases, it may be advisable to protect the feeder against friction and a wrapping of insulating tape will serve. The effect of local electrical interference tends to cancel out in the two wires forming the feeder, with the result that noise from this source is much less than it otherwise would be. SMALL BOATS. By small boats is meant yachts, trawlers, cabin cruisers and similar sized vessels. Again, it is difficult to give advice, since so much depends on individual circumstances. In the majority of cases, it will only be possible to employ a com- paratively short length of wire but, because of the open surroundings and free- dom from serious screening, results will still be good. » i ae Fig. 10. A suitable aerial for use in a tug or similar vessel. Some suggestions are made in the sketches herewith. Where a single mast exists, alternative arrangements are possible. Running a wire directly up the mast, as in Fig. 9, will prevent any possibility of fouling guy wires. It is necessary to use insulated wire and the insulation known as P.V.C. is very suitable, since it is tough and will not deteriorate quickly when exposed. For maximum effi- ciency, the wire should be spaced away from the mast with the aid of small porcelain stand-off insulators, but this refinement is not essential. OO * Fig. 11. Space is restricted on a motor cruiser but the aerial illustrated will give good results. Alternatively, the insulated twin feeder cable may be employed as an aerial. The insulation is fairly robust and it will not be important if the cable touches: metal or other objects. The cable should be run right up to the receiver and the two bared ends twisted together and connected to the aerial terminal (or socket). Whatever sort of wire is used, it must be fixed in a way which does not result in damage to the insulating covering. Page Seven