Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine USAF Radr Shop Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Thank you for visiting RF Cafe!
Copper Mountain Technologies (VNA) - RF Cafe
 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com

KR Electronics (RF Filters) - RF Cafe

TEM alternate - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

LL
 Post subject: TEM alternate
Posted: Thu Sep 29, 2005 10:53 am 
I saw an interesting question on another forum (won't mention since probably against policy) that I'd like to pose here.

"As an alternate to a TEM cell, we're exploring the idea of using a waveguide-below-cutoff as a means of creating a controlled environment for receiver sensitivity measurements. The receiver is within cellphone-sized package and contains a loop antenna. The receive frequency is roughly 900 MHz.

The thought is to construct a simple tubular rectangular metal structure with height and width dimensions appropriate to prevent waveguide propagation, supposedly providing a steep attenuation characteristic to an incident field at 900 MHz. One end of the tube would be open and allow placement of the receiver in a tightly controlled position within the tube. The other end of the tube would be closed off by a metal plate containing a panel-mount coaxial connector attached by cable to a signal generator.

The thought is to terminate the other end of the connector with some sort of a load appropriate to the generator (50 ohm wirewound resistor?) creating a field within the tube that would rapidly decay.

The generator level, length of the tube, and position of the receiver within the tube would be experimentally determined (using a known good receiver) to be appropriate for threshold testing of subsequent receivers.

Does the concept have merit? Any comments/suggestions would be most welcome."

Posted  11/12/2012

RIGOL Technologies (test equipment) - RF Cafe
RF Cafe Sponsors
Innovative Power Products Passive RF Products - RF Cafe
Anatech Electronics (RF Filters) - RF Cafe

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

These Are Available for Free