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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...

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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.

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Post subject: WHY? this is SO. Posted: Tue Sep 27, 2005 2:48 am


Joined: Wed Sep 21, 2005 3:40 am
Posts: 10
Location: Islamabad,Pakistan.
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?
Our 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,
noise figure, propagation, gain, power, phase noise,


Post subject: Posted: Wed Sep 28, 2005 1:58 am

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Todd, that was a really good one. I would suggest another profession as a comedian for retired Electronics Engineers.


Best regards,

- IR


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 digital signal.

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.

So communications 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.

Good Luck!


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
Posts: 10
Location: Islamabad,Pakistan.
Hi todd.
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 engineer.
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 a lot.
Thanks for your suggestion.
Send more suggestions at:
I am waiting.
Again thanks but sorry dear.

Posted  11/12/2012
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