Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

WHY? This is SO - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

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

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !