Constructional Data for Short-Wave Coils

Radio Record, Volume IV, Issue 38, 3 April 1931, Page 12

Constructional Data for Short-Wave Coils

S$ numerous inquiries for short-wave coil specifications reach us we have prepared the following table of various combinations. A slight departure from specifications in either coil or condenser should not affect efficiency greatly, but it will slightly alter tuning. This table was published some time ago, but there have been many requests from new readers for its republication, so we are complying. Cut it out, it will be useful.

Valve Base. Tuning Midget, 32mmfd. Reaction, 32mmfd.

*Tickler wound double layer or band,

Valve Base. Tuning, .00015. Reaction. Resistance.

"Tubes slpped over valve base.

"Tube sin. long slipped over valve to take winding **All enamelled wiring spaced by own diameter.

Diameter, 1din. Tuning, .00015. TReaction, 000255.

Diameter, 14in. Condenser, .00O15. Reaction, .00085.

Diameter, 2in. Tuning, .000125. Reaction, .00015.

38-inch Former. Condenser, 0001 Reaction, .00025

Diameter, 3in. Tuning, .00015. Reaction, .00025.

Band. Secondary. Wire: Tickler: Wire: 19-25 7 24 d.cc: 7 28 d.cc 25-35 10 24 d,c.c 10 28 d.cc: 35-45 15 24 dcc 15 28' d.c.c 45-64 22 24 d.cc 22# 28 d,cc 62-110 40 24 dcc 40* 28 d.c.c

Valve Base_ .00015 Tuning and .00015 Reaction_ Band. Secondary Wire. Reaction. Wire. 9-15 23 26; dsc: 3 30 dsc: 15-28 6 26 dsc: 52 30 dsc. 28-50 8} 26 dlsc 10 30 dsc; 50-100 15} 26 dlsc: 11 30 dsc 205-350 968 28 dlsc: 30 36 dsc 320-550 195 32 dsc: 50 36 dsc:

Band. Secondary. Wire_ Tickler: Wire: 9-16 22 26 dsc. 32 36 dsc 15-30 52 26 dsc. 6 36 dlsc. 28-55 83 . 26 dsc; 10} 36 'dsc 50-110 15} 26 dsc. 143 36 dsc 200-325* 80 30 30 36 dsc. 320-500 148 30 36 dsc

Valve Base. Tuning, .00025. Reaction. Resistance controlled. Band. Secondary. Wire. Tickler. Wire. 16-45 ..... « SR oeeeee 24 @F oo ocen 44... 380 e 40-90 ..eeee 18% ...... 24 e. cocoes TE eooees 30 @ 250-540 ..... 110* ...... 30 e4 ceveee OD os 84 e

Diameter, 14in. 10-20 .... 3 .... 18 18-30 .... 5 .... 20 28-38 .... 8 ..0. 24 34-60 .... 10 .... 26 56-100 ... 12 .... 30 Tuning, Band. Primary. Wire. 8 dse. dse. dse. dse. . dse. .... 0001. Reaction, .00035. Secondary. Wire. 3 .... 18 dse. 5... 20 dse..... » 12.... 24 dse. .... 2 26 dse. .... 45 .... 80 ds... Tickler. Wire. -.- 30 Ase. 30 dse. 80 dse. 80 dse . 380 dse.

Band. Secondary. Wire. TTickler: Wire: 16-30 5 18 e. 5 26 e. 29-38 12 20 e. 9 26 e. 54-110 22 20 e. 15 26 103-225 45 26; e. 24 26 & 220-350 115 30 e. 12 34 300-550 195 32 e, 50 36 e.

Band: Secondary. Wire; Tickler. Wire. 14-32 62 22 e. 5} 34 dl,ec 30-65 133 22 e. 5} 34 d.cc 50-110 25 24 e. 92 34 d.cc 100-220 50 24 e 15} 34 d.cc

Band. Primary. Wire. Secondary. Wire. Tickler, Wire. 15-25 ..... 4 ...... 26 e, ...- 4.... Ide .... 8B ..., 26 dse 24-40 ...-- 6 ...0.. 26 @ 2... 7 0s. Ite 1... 5... 26 dse. 87.5-65 ... 18 ...... 26 ...,14 ..., de 1... 6 1... 26 dsc, 64-115 ..., 24 ...... 26 @ ....24 .... 16 e .... 6.2... 26 dss.

Band. Secondary. Wire. Tickler. Wire 15-30 3 18 e. 22 e. 30-45 6 18 e. $ 22 e. 45-85 11 18 e. 22 e. 65-110 20 18 e. 5 22 e.

Band. Primary: Wire. Secondary. WVire: Tickler. Wire. 15-35 7 26 e. 3 24 e. 8 28 dsc 30-70 7 26 e. 9 24 e. 4 28 dsc: 00-130 26 0. 19 24 e, 6 30 dsc: