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:
WHY? this is SO - 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: WHY? this is SO. Posted: Tue Sep 27, 2005
Joined: Wed Sep 21, 2005 3:40 am
Hello every body:
Every one of us is aware of this fact that we always make the transmission
of our signals in analog form.Why we do not preffer digital?
information signal is in digital form in most of modern technologies
but we use analog signals as carrier of our information signal.Receiver
side has to filter the received signal to extrect informatic signal.
Please tell three reasons for this?
Post subject: Posted: Tue Sep 27, 2005 11:49 am
Don't get me wrong
Naveed, I like you. I think you're the best thing that has happened
to this website forum for a long time.
But have you ever considered
having a different profession?
Like hair stylist or disco dancer?
If his profession really interests you, then read more about
Harmonics, Linearity, impedance mating, bandwidth,
figure, propagation, gain, power, phase noise,
Post subject: Posted: Wed Sep 28, 2005 1:58
Joined: Mon Jun 27, 2005 2:02 pm
Todd, that was a really good one.
I would suggest another profession as a comedian for retired Electronics
Post subject: Analog/DigitalPosted:
Wed Sep 28, 2005 5:42 pm
Except when you get down to an atomic scale,
where you get real quantum effects, there is no such thing as a truly
ALL digital signals are inherently and unavoidably
analog in nature - it's just that we interpret them as a ONE or a ZERO.
Even classic TTL digital circuits have specifications like VIL, VIH,
VOL, and VOH, noise margin, rise and fall times, etc.
engineering is in large part the selection of waveforms to communicate
what we need to communicate. Some signals appear more "digital", but
they are always at root analog, because voltages and currents are not
limited to certain values.
When I first started doing digital
design, a co-worker came into my office and said "All the world's an
analog stage, where digital circuits play bit parts." Well, it's not
just bit parts any more, but analog it certainly is. The designers of
3 GHz cpu clock rate computers cannot ignore wave effects, and "all
that Maxwell's equations stuff". Digital IS analog.
Post subject: Just for TODD,have
a look at thisPosted: Thu Sep 29, 2005 2:10 am
Joined: Wed Sep 21, 2005 3:40 am
I was shocked to read that you like me but no problem.
u have suggested a job like dancer and hair stylist instead of a telecommunication
I am very very very very sorry to say that I can't do this.
I like these professions but don't want to be a part of them so sorry
Thanks for your suggestion.
Send more suggestions at:
I am waiting.
Again thanks but sorry dear.