Formulas & Data:
- Electronics
- Mathematics
- Physics
- RF & Microwaves

Parts Vendors:
- all hand-selected

- Amateur Radio
- Vintage Articles:
- Electronics World
- Popular Electronics
- Radio & TV News
- Radio Craft
- Short Wave Craft
- Wireless World

- Events Calendar
RF Cafe Homepage
Copyright 1999-2015   •−•  ••−•    −•−•  •−  ••−•  •   "RF Cafe" in Morse Code  >> Listen to It <<
- EW & Radar Handbook
- Quizzes       - Software
- App Notes
- Calculators
- Advertise on RF Cafe
- About RF Cafe™
- RF Cafe Shirts & Mugs
- RF Cafe Archives
RF Cafe Book Contest
- RF Cafe on Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
- Tech Humor
- Forums Archive
- Job Board
- Donate to RF Cafe
- Kirt's Cogitations
Custom Search
More than 10,000 searchable pages indexed.
Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it here. Thanks!

WHY? this is SO - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

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

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website