ANSWERS TO CORRESPONDENTS

Radio Record, Volume I, Issue 15, 28 October 1927, Page 14

ANSWERS TO CORRESPONDENTS

From Matakohe a Browning-Drake constructor sends the following ‘letter: — I wish to thank you for your kind reply to my inquiry. I have the set going, and am getting power and to spare on all the New Zealand three main stations, but have not yet tried it out on any of the lesser stations. I am very pleased with the clear way you have of explaining things, and althongh very much a beginner have managed to build quite an efficient set, There is no sign of Farmer’s or 2BL when I am listening to Wellington or Auckland, or vice versa.’’-Pleased to hear of your success-you will soon be raking-in the ‘‘lesser ones.’’ An interesting letter and photograph from a lighthouse-keeper will be dealt with next week. "Rongotai’ (Wellington) asks if there is any method of charging a B accuinulator with an ordinary A accumulator charger. Such a method was fully described in Nos. 11 and 12 of the "Record." The only proviso is that the B hattery must be divided. into sections each of several volts below the voltage given by the charger. This system works best with a charger giving a voltage between 16 to 24 volts. Converting Set to Browning-Drake. Inquirer" (Otago) wishes to know if he can convert a Roberts reflex threevalve set into a four-valve BrowningDrake as described in recent issues. Certainly this conld be done, especially as panel and baseboard are the correct size. Follow the published instructions, using anv existing gear that von can. The .0005 variable condensers will necessitate fewer turns on the secondary coil. If vour aerial atid R.F. transformer coils are Both snace-wound, use them as thev are. ‘fickler of 20 turns will be richt, bué connections may have to be reversed, Connections to variable condensers, ete,, should be made as in article, otherwise you will he troubled with hand-canacitv. Prohably yorr Kellore 44 ta 1 andio transformer will do well for first stave and the Ferranti A3 far second stage, as you suggest, will vive excellent results. Fived condensers across primary first audio transformer, and a small value across plate and wrid terminals of same, but not across secondary. Another of good capacity across speaker and ’nhone outynt, although this is not shown in diagram. Considerable interest is being taken in the article recently published on the oscillating crvstal, and reoders are inquirine as to where a suitable crystal ean be obtained. If anv dealer has rood ‘snecimens of zincite in stock. ‘Meg nhm" would he slad ta he advised ace’ cordinely, so that inquirers can be put in touch.