VK7WI Northern Radio Exhibition pic 2
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12 AMATEUR RADIO OCTOBER Ist, 1939 Great interest was shown by the public at all times, especially with the duplex telephony carried out with VK7XL and VK7BQ. We are greatly indebted to VK7XL (Mr. Geo. Groves), who at that time was a non-member of the W.I.A., for his assistance in standing by at all times to contact us when conditions were unfavorable for outside contacts. High noise level prevented us from making very many DX QSO’S, but several American amateurs were contacted. Probably our best DX were three contacts with Great Britain on two-way ’phone, especi- ally G6BW, who reported us QSA5 R8 solid. Short-wave listeners re- ported reception of VK7WI from many countries. Many congratulations were receiv- ed on the excellence of the exhibit, and we sincerely hope that we have left a favorable impression on all those who saw 7WI in operation. WANTED Can anyone devise this equipment. The Editor, “Amateur Radio.” Dear Sir, Here is a chance for some of the Hams who have initiative. I am looking for a_ sure-fire method of detecting metallic sub- stances, which are liable to create considerable damage during various processes used in my business, which business incidentally provides the wherewithall for my own Ham activities. So far, I am stumped. Briefly, the process is one of feed- ing fibrous material, hessian, bags, ete., etc., into a carding or teasing machine. This machine has therein some hundreds of thousands of small pins on its many rollers. The clear- ance between the rollers is in some cases measured in thous. of an inch. Occasionally, the raw material being fed in, is received by us with metallic substances (wire, nails, nuts, bolts and such like) therein, and may be of brass or ferreous metal. I am looking for a method which will detect these substances before they actually reach the feed rollers of the machine. There is adequate space for in- stalling some kind of gear on the feed table over which the fibrous materials above move very slowly— approximately 3 inches per second. It will be seen that a magnetic apparatus is out of the question on account of the possibility of metals other than ferreuos types being present. I wonder whether any of your readers can help me out of my diffi- culty. It is hopeless for me to in- struct the suppliers of fibre that such metallic substances be not present. Although I use a nom-de-plume, my enquiry is quite genuine, and you have my permission, if you so wish, to make known my name to any person who may write you on the matter. Yours faithfully, BI-METALLIC, c/o W.I.A. Melbourne. ° ° Camtran Windings Specialising in customer's require- ments for Interstage, Line, Microphone and Output Trans- formers. Booster, Step-Down and Power Transformers. REWINDING — Customer’s __ ow! equipment such as RELAY cons, and SPEAKER Transformers and Field Coils a specialty. POWER AND AUDIO Chokes. 4th Floor, HARDY’S CHAMBERS, 5 HUNTER STREET, SYDNEY. ‘Phone: B4881. A. R. Paetz, Prop.