Search RFCafe.com                           
      More Than 18,000 Unique Pages
Please support me by ADVERTISING!
Serving a Pleasant Blend of Yesterday, Today, and Tomorrow™ Please Support My Advertisers!
   Formulas & Data
Electronics | RF
Mathematics
Mechanics | Physics
     AI-Generated
     Technical Data
Pioneers | Society
Companies | Parts
Principles | Groups


 About | Sitemap
Homepage Archive
        Resources
Articles, Forums Calculators, Radar
Magazines, Museum
Radio Service Data
Software, Videos
     Entertainment
Crosswords, Humor Cogitations, Podcast
Quotes, Quizzes
   Parts & Services
1000s of Listings
 Vintage Magazines
Electronics World
Popular Electronics
Radio & TV News
QST | Pop Science
Popular Mechanics
Radio-Craft
Radio-Electronics
Short Wave Craft
Electronics | OFA
Saturday Eve Post

Software: RF Cascade Workbook
RF Stencils for Visio | RF Symbols for Visio
RF Symbols for Office | Cafe Press
Espresso Engineering Workbook

Aegis Power  |  Alliance Test
Centric RF  |  Empower RF
ISOTEC  |  Reactel  |  RFCT
San Fran Circuits

Crane Aerospace Electronics Microwave Solutions: Space Qualified Passive Products

Noisecom

KR Electronics (RF Filters) - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low-priced products, all of which I created.

RF Cascade Workbook for Excel

RF & Electronics Symbols for Visio

RF & Electronics Symbols for Office

RF & Electronics Stencils for Visio

RF Workbench

T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads

These Are Available for Free

Espresso Engineering Workbook™

Smith Chart™ for Excel

Innovative Power Products (IPP) 90 deg Hybrid Couplers

On the Cover: Antenna Testing Methods
March 1954 Radio-Electronics

March 1954 Radio-Electronics

March 1954 Radio-Electronics Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Electronics, published 1930-1988. All copyrights hereby acknowledged.

Lecher Line (wikipedia.org) - RF CafeOften, the photo on the covers of magazines is related to a feature article within, but in the case of the March 1954 Radio-Electronics, only a couple paragraphs are devoted to it. Although more commonplace back in the day, mention of a Lecher wire for measuring VSWR values of the antenna under test caused me to look it up. The Wikipedia entry says, "Lecher line or Lecher wires is a pair of parallel wires or rods that were used to measure the wavelength of radio waves, mainly at VHF, UHF and microwave frequencies. They form a short length of balanced transmission line (a resonant stub). When attached to a source of radio-frequency power such as a radio transmitter, the radio waves form standing waves along their length. By sliding a conductive bar that bridges the two wires along their length, the length of the waves can be physically measured. Austrian physicist Ernst Lecher, improving on techniques used by Oliver Lodge and Heinrich Hertz, developed this method of measuring wavelength around 1888." Interesting, non?

On the Cover: Antenna Testing Methods

On the Cover: Antenna Testing Methods, March 1954 Radio-Electronics - RF CafeWith the scenic Catskill mountains as a background, engineer Julius Green of Channel Master, Ellenville, N. Y., is seen testing the Ultra-Bow antenna.

The experiment in process consists of measuring the characteristic impedance of the antenna. The girl, Barbara Watson, is recording standing-wave ratios as measured on a Lecher wire and is taking signal generator and voltmeter readings.

The large wooden mast behind them is used for field testing. The tower mounted on the mast can be pivoted in a vertical plane. The tower and mast represent the receiving section of a transmit-receive setup.

At the end of the tower is mounted the antenna to be tested; in this case it is the 2-bay Champion. The antenna can be rotated 360° by a selsyn motor mounted on the tower and can be controlled from a nearby laboratory. The antenna under test is rotated at a speed of 2 r.p.m. while the receiving pattern is automatically recorded.

 

 

Posted May 16, 2022

Innovative Power Products (IPP) 90 deg Hybrid Couplers
withwave microwave devices - RF Cafe

Innovative Power Products (IPP) Directional Couplers

TotalTemp Technologies (Thermal Platforms) - RF Cafe