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 Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
Exodus Advanced Communications

Transmission Line theory, please help! - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

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

screamtruth
 Post subject: Transmission Line theory, please help!
Posted: Thu Jul 01, 2004 3:08 pm 
 
Lieutenant

Joined: Thu Jul 01, 2004 2:58 pm
Posts: 1
Location: Channelview, Tx and World
I'm trying to learn transmission line theory on my own, a difficult task, as I'm finding out. Keep in mind, our sub sea control lines are balanced tranmission lines, and have lengths in excess of 10km. Now, first can anybody explain the losses, or attenuation of these lines? Is it just a function of the series resistance per unit length? Or, is it a function of frequency, impedance? Our test frequencies are LOW, I mean in the range of 1 to 3 kHz. Does surface roughness play a part in this? Secondly, I have no way to measure the reflection coefficient or SWR caused by the Well load on the opposite end. Last, I am trying to calculate the NVP for a specific conductor in which I know the Z,C,L values, is there an easy way to perform this? How does the formula for propagation constant play here; y=a+jB. y = prop constant, a = attenuation, and jB for phase shift.

_________________
What? Huh?


 
   
 
KC2SHO
 Post subject:
Posted: Thu Jul 01, 2004 5:43 pm 
 
Captain
 

Joined: Mon Apr 12, 2004 4:50 pm
Posts: 20
Location: South Florida
I have some very good training materials in PDF format if you are interested.

_________________
KC2SHO



Posted  11/12/2012
Triad RF Systems ConductRF Phased Matched RF Cables - RF Cafe
NorthEast RF Antenna Testing Services Berkeley Nucleonics Academy - 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 typing 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

spacer

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

These Are Available for Free