QUESTIONS AND ANSWERS

Radio Record, 19 June 1936, Page 48

QUESTIONS AND ANSWERS

TE*1098- (Nightcaps) : The best length of aerial jis. about 100 feet placed as high as possible, vertical being the best of all. The length that one is allowed to erect is not limited now. ‘T MLL." (Manurewa): The best plan. ¢ would be to make up the "PreSelector Unit’ described in the 1986 "Radio Constructors’ Guide," using a two-gang condenser of 0.0005 mfd. per section. This would then be suitable for any set. mh Ww." (Tauranga): The marking on * the speaker is merely the resistance in ohms of the-windings. It has nothing to do with the loudness of the signals given: by the speaker. ‘The one that you have would be just as suitable as any of the others you mention, the best resistance to use depending on the type of yalve used in the last stage of the set. "T V.D.". (Le Kuiti): The value of *each section for the "Pre-Selector Unit" should have been given as 0.0005 mfd. If this size is unobtainable you can, use .00085 with a reduction of the covering range. Yes, the heater supply could be taken from your set provided that the transformer there does not warm up too much with the extra load. "PYRAKEH" (Kokiri): We are afraid that we cannot help you in the alteration of your receiver, as we do not. design circuits for individual requirements, _ _. " D." (Mount Eden): In the April *issue of the "Radio Times" there is described completely the ‘"Hxelrad Broadcast, Superhet Five." This should suit your needs exactly, as it has plenty of reserve and is an excellent performer. "63844." (Napier): The model you have does not usually need any realignment except when hew valves are fitted and the sealing of the condensers is performed to protect the guarantee. We suggest that you get the set checked by the nearest agents. who will be able to reseal it afterward. "CURIOUS" (Frankton): In the July issue of the "Radio Times’ there _ Will be described a very high quality receiyer with each stage of the audio ‘in push-pull, You will probably be interested in this, which could be modified if you wish from the present 12 valves, to perhaps 10, and we suggest you await this description before deciding on any other ype. "QTALO" (Limaru) : The iron core coil has a selectivity curve that approaches the ideal more closely than

does the air core coil, and it also has a greater sensitivity. There is a detinite limitation imposed in ‘recording or broadcasting music, on the ratio of the:high to low passages,.due to practical details in the apparatus used. The volume expander over-accentuates the crescendo passages to an amount , sufficient to make up for this limitation. imposed, "(\URIOUS" (Reefton) : In the absence of any details, it is impossible to answer your question fully, We are inclined to blame a faulty valve or a faulty resistor, and suggest that you have the set overhauled by a good serviceman, "Py X341Ww." (Palmerston North): We : * are-afraid that you will have to lower ‘that aerial even if it does mean lowering the pole, as there is no other way to adjust the condensers except by having the twisted pair near the aerial. By the way, when doing this see that the two ends of the twisted flex cannot touch each other and are well insulated there, os Tt is better to put.in the paper and to adhere to the instructions closely. :