Copyright: 1996 - 2024
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:
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
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: Help for a newbie Posted: Fri Oct 14, 2005
Joined: Fri Oct 14, 2005 10:05 am
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?
Posted: Fri Oct 14, 2005 11:43 am
Mon Jul 18, 2005 4:31 pm
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
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
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.