Early last year the Historical Radio Society Of Australia held a major competition for radio constructors. The project consisted of building replica Browning Drakes. Much information was culled by members from old publications, from BD articles etc. to be able to construct them to be as authentic as possible. There were 2 categories, actual submissions and postal. Judging was held at the end of the year and the results were published in the January 2001 "Radio Waves" the quarterly publication of the HRSA. Also published in this issue was an article by Jim where he comprehensively describes his BDs construction. The following is a very much condensed version.
"I was quite thrilled to be informed that I had won the postal section of the Browning Drake competition.
For the information of others I shall set out how I constructed the receiver."
Coils: The heart of the receiver is the two tuning coils. As it is rather difficult to obtain the double cotton covered wire originally used I substituted modern enamelled wire. The problem here is the difference in the diameter of the two wires. By cutting a 36 TPI thread on the former to take the winding I was able to achieve the correct spacing to closely adhere to the original.
|For the regenaformer primary winding I turned a ring from 1/4" perspex with a 0.5mm groove in the outer edge to take the winding this was just pressed into the main former. The tickler coil was made a smaller diameter in similar manner but I glued two pieces together to take the 1/4" shaft. The nuts and bearings of two old wirewound pots were fitted to each side of the coil former. The flexible leads were made from desoldering wick.|
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