Anatech Electronics (RF Filters) - RF Cafe
Windfreak Technologies

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
    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 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:

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!
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

Help for a newbie - 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

Post subject: Help for a newbie Posted: Fri Oct 14, 2005 10:28 am


Joined: Fri Oct 14, 2005 10:05 am
Posts: 1
Let me start by saying I have minimal experience with electronics, I have a Electronics degree from ITT (please.. no laughing) of which I haven't used any of the knowledge in 7 years. If you find this isn't the appropriate place for this question or isn't the appropriate site please point me in the correct direction (before or after you flame me.. your choice ).
I have the need for a transmitter that is triggered on a small input voltage (< .5V) the transmitter will need to transmit < 20 feet (usually no more than 5 feet) and trigger a reciever that will send an output of .5V. What is transmitted doesn't matter (to me anyway). I will have multiple transmitter/receiver combos in the same location so I will need mutlple frequencies. I don't know if this is to much to do for a novice or if this is something simple and I am just skipping past the solution. If this is something to simple for a novice is there somewhere I can go to try and find designers?


Travis Williams


Post subject: Posted: Fri Oct 14, 2005 11:43 am


Joined: Mon Jul 18, 2005 4:31 pm
Posts: 32
Location: Baltimore, MD
Hard to offer you a good solution since you haven't mentioned the application, but I suggest you look into circuits and ICs made for handling car Remote Keyless Entry systems (RKE) or garage door opener transmitters. Either of those will be great for your application... probably even more than you need.


Post subject: Posted: Fri Oct 14, 2005 12:03 pm
Is there a common place to go to to look for people who do circuit design for profit? I see a lot of big companies that say they do it and spread the cost out during the ordering of the circuit.. but we are kind of in a proof of concept phase and don't really want to incur a lot of cost for something that isn't going to work the way we want anyway.




Post subject: Posted: Thu Oct 20, 2005 2:38 am


Joined: Mon Sep 26, 2005 7:29 pm
Posts: 13
Kanlings suggestion was a pretty good one. With the concept of garage door openers, you could have multi RX/TX units, with each having a seperate code. The coding would allow you to do what ever it is you need multi RX/TX units for.
As far as designing from scratch, I think you would be in over your head, and a design person would cost you some serious money. If you are serious about hiring someone, perhaps you could call one of the garage opener companies, and ask them if they could take an existing product and just add the changes which would fit your application.

Posted  11/12/2012
RF Superstore (RF Components) - RF Cafe
EMC Directory
LOTUS Communications Systems Modular RF Component Building Blocks - RF Cafe

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

These Are Available for Free