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!
withwave microwave devices - RF Cafe
Anatech Electronics (RF Filters) - 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

Innovative Power Products Couplers

ORFS Reference Power Different? - 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

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Systems

-- Test & Measurement

lucious
 Post subject: ORFS Reference Power Different?
Posted: Fri Aug 08, 2008 5:10 am 
 
Lieutenant
User avatar

Joined: Tue Apr 22, 2008 8:24 am

Posts: 1

Hi Guys,

Recently, during testing, I request the DUT to transmit the signal at EGSM, CH38 and PL5. and I measure it using both R&S CMU200 and Agilent 8960. The Reference Power for "Spectrum due to Switching" is around 33.87dBm, whereas the Reference Power for "Spectrum due to Modulation" is around 25.73dBm. So, I was wondering why there is about 8.14dB different.

According to my colleague, he mention that this is because of the definition of the "Spectrum due to Modulation" which require the average power of the whole channel, which is average power of the 8 time slots. And after calculating using the 33.87dBm,

10log [ (10^33.87/10) / 8 ] = 24.84dBm

the value calculated is 24.84dBm, but it has around 1dB different from the measured power.

So I am curious whether is the method that my colleague thought me is wrong or is the way of the instruments measure differently. Please do let me know about why is this happened. And I'm interested on how these Reference Power are calculated/measured as well.

Please let me know if you need further details.

Thanks in advance!

BR

Lucious

Posted  11/12/2012

RIGOL Technologies (test equipment) - RF Cafe

RF Cafe Visitor Comments on News, Articles, System, Design, Components, etc.

Please e-mail your comment to me (Kirt B.), and I will post it here for you - no computers involved!

1 - Your participation will be greatly appreciated. - Kirt B.

Exodus Advanced Communications Best in Class RF Amplifier SSPAs
Axiom Test Equipment - RF Cafe
 

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

These Are Available for Free