Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums RF Cafe Homepage Thank you for visiting RF Cafe!

Coax Amplitude Ripple Issues - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

 Post subject: coax amplitude ripple issues
Posted: Mon May 29, 2006 3:11 am 

Joined: Mon May 29, 2006 3:07 am
Posts: 2
I'm having some issues testing our system- I can't shake the amplitude ripple I'm reading from the coax cables I'm using. I've tried changing cables, using different lengths, making sure connections are tight, having isolation in the path, and nothing is working.

Any thoughts? I'm testing in a high heat/humidity region, so maybe that's the issue . . .

Thanks so much.

 Post subject:
Posted: Thu Jun 01, 2006 11:05 am 

Joined: Sun Jan 11, 2004 4:44 pm
Posts: 18
Are you sure that the cables & connectors are rated for the frequencies that you're operating at? If you're transmitting anything with a square edge, then you;d better make sure that the cable is rated at least 5x your highest fundamental or the harmonics that make up the edges will be reflected and possibly be causing your amplitude ripple.

Otherwise, maybe the impedance of your source and/or load are not close enough to the cable/connector impedance and you are seeing VSWR (that's my name!) mismatch induced ripple. If your source/load is even 10 ohms off of your transmittion path impedance the amplitude ripple can be noticealbe of long distances.

You didn't mention how long the cable run is or your signal frequency & modulation type, so all I can do is make these guesses. Hope they help.

--- VSWR ---

 Post subject:
Posted: Thu Jun 01, 2006 9:13 pm 

Joined: Mon May 29, 2006 3:07 am
Posts: 2
I'm in the 10-13 GHz region. I'm using the appropriate isolators, and my cable runs are only around 12ft. However, in talking with a senior RF tester, he says that my adapters may be causing the issues- I'm using a fair number of adapters to connect my SMA isolators to my N-type coax. Minimizing them may be the key. Any thoughts?

Thanks for your input.

Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Kirt Blattenberger,

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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !