Anatech Electronics (RF Filters) - RF Cafe
Windfreak Technologies
 

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

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 App Notes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Homepage Thank you for visiting RF Cafe!
Anatech Electronics

FM Band Transmitter Specs - 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. If the folks at phpBB would release a version with integrated sign-in from the major social media platforms, I would resurrect the RF Cafe Forums, but until then it is probably not worth the effort. 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

FL Techie
Post subject: FM Band Transmitter Specs Posted: Tue Oct 11, 2005 4:33 pm

Captain


Joined: Tue Jan 06, 2004 1:51 pm
Posts: 8
Sorry for posting in multiple places, but I need this in a hurry.

Does anyone know exactly what FCC spec governs the output of an FM transmitter? My application is for low power (<1 W), and in fact will be covered by Part 15. However, I want to know the real specification limits for THD, frequency accuracy, L-R channel separation, S/N, etc.

I have spent a couple hours searching the web and the FCC website but CANNOT find it!!!

Thanks a lot guys (and gals, if applicable ).


Top

Guest
Post subject: FM SpecsPosted: Wed Oct 12, 2005 5:23 pm
The FCC has only a few real regulations for license-free ("Part 15") use:
1. less than 100 mW power
2. inside the FM band, and harmonics down a reasonable amount (I don't know what it is right off the top of my head.

The rest is up to you. If you want to make a crappy Part 15 stereo transmitter with lots of distortion, poor frequency response, almost no separation, etc. , the FCC won't quibble unless you go outside the band or power limits. If you want to make a state-of-the-art DSP-based stereo transmitter, the FCC won't quibble unless you go outside the band or power limits.

Broadcast station limits are something else. You might look at those for THD, separation, frequency response, distortion, etc. if you want a baseline for comparison.

I know these answers are not what you were hoping for - but they do reflect the regs.

Good Luck!


Top

FL Techie
Post subject: Posted: Thu Oct 13, 2005 7:42 am

Captain


Joined: Tue Jan 06, 2004 1:51 pm
Posts: 8
Thanks for the infoGuest. Morton provided the documents I was loking for here.

http://rfcafe.com/phpBB2/posting.php?mode=reply&t=1833



Posted  11/12/2012
Werbel Microwave - RF Cafe
Amplifier Solutions Corporation (ASC) - RF Cafe
 

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

These Are Available for Free