Use of Chokes

Radio Record, Volume III, Issue 20, 29 November 1929, Page 27

Use of Chokes

For Short-Weve Work N a set intended particularly for short-wave reception, it is advisable to use high-frequency chokes which are specially wound for this purpose,. The average constructor might find it a little difficult to wind a choke which would] perform efficiently on both broadeast bands, but the construction of a short-wave choke should present no difficulties. The materials required are a piece of ebonite tube 7-8in, in diameter and 23in. long and an ounce of 36’s single silk-covered wire. Drill a small hole half an inch from the end of the tube and fasten the wire by threading it through. Another method of fastening is to place a small terminal in the hole with the wire, seraped clean, under it. Wind on a hundred turns close together and fasten the other end in the same way as the first. Ordinary plug-in coils. of about 25 to 85 turns can be used to serve the purpose of a short-wave choke, but they are not so, compact as those outlined above, while owing to the larger "field" they need careful placing in the set to obviate interaction.