Tandem tuning in radio receivers demands careful design
The article outlines that successful tandem tuning hinges on matching inductive and capacitive values in each stage to compensate parasitics. It discusses coil choices, vernier capacitances, antenna coupling, and practical assembly tips like mounting the series condenser inside the cabinet to reduce handling.
MENTIONED IN THIS ARTICLE
New York Herald-Tribune
Amsco
Radio waves travel two paths cause fading say experts
General Electric scientists cites Dr E B Free on Week's Science reporting two distinct radio wave paths. Surface waves travel near ground while higher atmospheric waves ride fifty to one hundred miles up. When they arrive together interference can cause fading and reception disturbances.
MENTIONED IN THIS ARTICLE
General Electro Company
E. B Free
Science
New -York
Local radio tubes and aerials affect reception range
The article discusses how single and multi-tube crystal sets without tubes are for local stations. One-tube sets reach only nearby signals, while adding tubes after the detector boosts volume and sensitivity. A good aerial improves distance, and loop aerials are not used without radio frequency amplification.
Radio Fifty Wire Reaches Global Reach on 70 Foot Pole
A slender wire nearly pencil thick hangs from a 70 foot wooden pole and functions as a radio link from Schenectady New York. The setup flashes across the globe delivering radio coverage to nearly every habitable corner.
MENTIONED IN THIS ARTICLE
2XAF
Schenectady
N. Y
Wave Length Range and How to Keep in Tune
Article explains two methods to tune receiving sets for 200 to 600 meter waves. Placing a coil in series with the antenna increases effective wavelength. a series condenser reduces the range. Instructions cover connecting leads from coil or condenser to the antenna binding post.
Aerial Lengths and Switch Setup for Home Antennas
Short indoor aerial offers selectivity while a long outdoor aerial provides volume and distance. A single pole double throw switch can combine both. Run bell wire through rooms to the indoor aerial and connect to the switch post. The outside coax feeds the other switch post. The center contact feeds the set’s aerial input.
Radio Aerial Efficiency Ranges Report
Radio engineers nationwide report that indoor aerials are far less efficient than outdoor ones. The average loop aerial tests at about 5 percent the efficiency of outdoor aerials, while indoor aerials reach only 10 to 15 percent efficiency.
Old Age Pensions Adopted Worldwide
Thrift Magazine notes old age pensions are in force in Great Britain France Germany Belgium Argentina Australia Sweden Italy Portugal Greece Switzerland Denmark Austria Czechoslovakia and New Zealand.
MENTIONED IN THIS ARTICLE
Great Britain
France
Germany
Belgium
Argentina
Australia
Sweden
Italy
Portugal
Greece
Switzerland
Denmark
Austria
Czechoslovakia
New Zealand
Thrift Magazine
Sport Licenses Reach Millions in 1924 25 Season
American hunters and anglers took out more than 5,000,000 licenses during the 1924 25 season. State treasuries received returns totaling over 6,400,000 dollars.
Danger of Typhoid in Vacation Season
Public health officials warn typhoid risk rises with motor car travel during peak tourist season. In 1925 cases spread from a polluted Indiana town to eight states, with Illinois recording six linked cases. Vaccination, safe food and water, and sanitation are urged for travelers and communities.
MENTIONED IN THIS ARTICLE
Illinois
Magnetism: Ferro Magnetic Trio and Heusler Alloy Found
Faraday showed in 1845 that all substances respond to strong magnets. Ferro magnetic metals iron nickel and cobalt dominate this group. Heusler alloy copper aluminum manganese also responds, claimed to rival iron in magnetization.
MENTIONED IN THIS ARTICLE
Faraday
Heusler
French Baby Premiums Boost Family Subsidies
The new law raises parental allowances to encourage larger families. Families with four or more children under thirteen receive 860 francs per child, with provision for widows and widowers. A widow with five children would obtain 1 800 francs annually, about 800 dollars at prewar rates.
MENTIONED IN THIS ARTICLE
France
London’s Longest and Shortest Streets
London’s longest thoroughfare is Hatgrow Road at more than three miles, while the shortest street is Shorter Street, measuring only 44 feet in length.
MENTIONED IN THIS ARTICLE
London
Hatgrow Road
Immigration into Palestine in 1925 totals 83 801
The Palestine immigration figure for 1925 excluding tourists and visitors reached 83 801, nearly matching the combined totals of the four preceding years. The net gain by immigration from the armistice to 1925 is about 70 000.
MENTIONED IN THIS ARTICLE
Palestine
Roman gold mined in Wales near Cairo field
Gold mining near Cairo Wales dates to about 1700 years ago under Roman activity. The site lies in a marshy field where ore was extracted in antiquity, reflecting historic extraction practices and regional activity.
MENTIONED IN THIS ARTICLE
Cairo
Wales
Customers and Owners Invested 26 Million in Stock
The customers of the electric service companies in the United States purchased during the past year a monthly average of 205000 shares of stock. Thus for the year the customers invested a total of 26000000 dollars in their securities.
MENTIONED IN THIS ARTICLE
United States
Ox tongue dinner prompts stomach roar joke
A humorous dialogue depicts a patient blaming a loud stomach sound on eating ox tongue. The doctor minimally comments, turning the moment into light banter about digestion and dinner choices.
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