Radio Broadcast (Nov 1923-Apr 1924)

Record Details:

Title:
Radio Broadcast
Date:
Nov 1923-Apr 1924
Publisher:
Garden City, N.Y., Doubleday, Page & company [etc.]
Volume:
Radio broadcast ..
Leaf #:
000372
Language:
English
Subjects:
radio periodical, Radio -- Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Radio Broadcast supported home listeners of the new technology of radio – for building or buying a receiving set to explaining the technology used by the new radio stations. Throughout the magazine shows the cultural influence of radio as it evolved from hobbyist to mainstream. -- David Pierce, 2011
Date Added:
September 29, 2022
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

354 Radio Broadcast CHART I CHART H A \ 7 1 a. 1 W avelength Range in Meters Size of Primary Tube Size of Secondary tube (or ball) Turns on Primary Turns on Secondary Turns on Tickler 175 to 220 (amateur) 32 3" ball or 2^ tuoe 12 30 40 220 to 500 (broadcast) same same 40 40 60 350 to 650 (upper broadcast and commercial) same same 60 80 80 a .001 mfd. condenser must be shunted across the secondary coil. Sharper tuning and a greater wave range may also be had by using a similar variable condenser in the antenna circuit, with a series-parallel switch, permitting its use in series with the antenna, and in shunt with the primary. The number of turns in Chart 1 apply equally well to straight windings, honeycombs, or the average spider-web. If the last division in Chart 1 (No. 3) is used, and the coils tapped, the wave range will include all those given for the smaller coils. For wavelengths in excess of those covered in the first chart, the reader is referred to Chart No. 2, which spans the higher wavelengths, which can only be attained, practicably, by the use of honeycomb coils (duolaterals). Chart 3 gives the wavelengths of honeycomb coils used singly, and shunted by .001 mfd. condensers. This data is useful in wavemeter work and in the construction of single circuit tuners for long wave reception. The relation between wavelength of a given coil and its number of turns is clearly shown by the charts. Type of Signal Wave Range Primary Secondary Tickler Commercial 450-700 900-1400 DL75 DLioo DLioo DL150 DLioo DLioo High commercial, And Time Signals (NAA) 1 5602750 DL300 DL300 DLioo Long Wave 80001 5000 1 000020000 DL600 DL1000 DL750 DL1250 DL300, 400 or 500 DL300, 500 or 600 CHART II! It is always a good idea to use the largest possible. coil for a given wave. Boosting it up by the addition of a shunt capacity is inefficient and results in loss of signal strength. Coil Number DL25 DL35 DL50 DL75 DLioo DL150 DL200 DL250 DL300 DL400 DL500 DL600 DL750 DL1000 DL1250 DLi 500 Approximate wave range with .001 shunt condenser 170-375 200-5 1 5 240-730 330-1030 450-1460 660-2200 860-2850 1 120-4000 1 340-4800 1 860-6300 2340-8500 29401 2000 3 100-1 5000 5700-19000 5900-21000 7200-2 5000 Supplemental List of Broadcasting Stations in the United States LICENSED FROM NOVEMBER 17 TO DECEMBER 14 INCLUSIVE CALL SIGNAL FREQUENCY WAVE POWER LOCATION /i^-i 1 \ (Kilocycles) length watts Galveston, Texas •. 1250 240 10 Fargo, N. Dak : 1300 231 20 Atlantic, Iowa 1100 273 10 Fayetteville, Arkansas 1140 263 100 Sioux City, Iowa 1150 261 50 Haverford, Pa 11 50 261 50 Toledo, Ohio -. mo 270 50 Newark, N. J 1230 244 50 Washington, Pa. 11 90 252 100 Camden, N. J 1330 226 100 Nashville, Tenn. 1 140 263 20 Butler, Pa. 1050 286 250 Kenosha, Wis 13 10 229 50 Houghton, Mich 1230 244 250 KFLX KFLY KFLZ KFMQ KFMR WABQ WABR WABS WABT WABU WABV WBR WOAR WWAO