in city without using pay phones ?

If the purpose is to have something that replaces pay phones, then
yes there are 2 way radios. However, why not using something more
common like cell phones :) Beats any two way radio there is....except
for the fact that it costs some money to use a cell phone. But it
sounded like you weren't happy stopping by a pay phone all the time.
So try cell phones.

Mounir

Hi all,

To start, I'm new to this group. I'm not even sure what you guys all
talk about .... but from the group name it sound rather interesting.

Curtis

Hi all,

To start, I'm new to this group. I'm not even sure what you guys all
talk about .... but from the group name it sound rather interesting.

Curtis

Can someone tell me where I might find manual on a Jerrold 727 field
strength meter. I bought this at a ham auction. thanks

I work as a Technical Support Engineer in Automation Division of a
Turkish Company, Ozdisan Electronics....I would like to discuss about
any kind of Automation and Electronics.

If you have any special projects about Automation we may share it.

开云体育

----- Original Message -----

From: Jim Purcell

To: Electronics_101@...

Sent: Saturday, October 27, 2001 10:53 PM

Subject: Re: [Electronics_101] hacking

ejazabidi,

> i need to know about "HACKING AND HOW TO HACK".
> is there some one how help me.

If you don't know how to hack, you probably don't want to do it. If you are
talking about breaking into computer systems and the like. The term 'hacker'
actually has no connection with the hacking you are probably talking about.
It's just that some hackers, i.e. people who like to play around with
computers also do the nasty kind of hacking. If I knew how to do it I would
never tell anyone.

Jim

Ditto that.


ServoKamen.

"Cruise Missile knockin' at your door."

FUNNY!!

开云体育

----- Original Message -----

From: lupinstel volkh

To: Electronics_101@...

Sent: Saturday, October 27, 2001 10:30 PM

Subject: [Electronics_101]

Got that right.


ServoKamen.

"Cruise Missile knockin' at your door."

FUNNY!!

Hmmm...Does the Lego robot development system use a PIC? I'm not sure.

-Mike

From: "Mounir Shita" <mshita@...>
Reply-To: Electronics_101@...
To: Electronics_101@...
Subject: [Electronics_101] Robots
Date: Sun, 28 Oct 2001 18:41:10 -0000

Anyone know where I can find a "PIC" powered little toy robot of some
kind? Toy store or something?

-Mounir

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Anyone know where I can find a "PIC" powered little toy robot of some
kind? Toy store or something?

-Mounir

ted,

who has to be coached even on basic terminology, to join this group?

Groups like this are about just what you are looking for. I can't speak for
the moderators but no one has been shunned for less than journeyman
knowledge. It has been my experience that many technologists, techies, etc.
have a wide range of knowledge and skill, there are few real experts.
Technology is complex if not necessarily difficult. Our knowledge may be vast
in some relatively specialized area and minimal in others. Then there are
hobbyists, whose knowledge and skill levels are even more diverse.

What you can't expect (nothing official, my opinion): We can't 'teach you
electronics. If you take courses or read up on theory we can sometimes offer
alternative ways of explaining theory or practice. We WONT do your homework.
That's a standard rule in most groups and lists. That would rob you of one of
your most valuable learning experience. It has been my experience that there
is a wide variety of knowledge and skill levels represented here, as with
most techie groups. Be careful of what people write, not everyone knows what
he is talking about. I know that sometimes that's even true of myself. :-)

Welcome to the group.

Jim

Hi!
i'm interested in electronics, but i only know basic stuff, didn't
actually learn it in school. would it be alright if someone like me,
who has to be coached even on basic terminology, to join this group?
i'm asking because i don't want to offend anyone who is already
advanced by asking very basic question. all i'm asking for is a bit
of patience for my level of understanding. thanks.

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Mark,

As I said I would rather learn things by doing rather than starting >off
with only extensive electronics laws and theory.

So would everybody. But it doesn't work that way.

That's true, lots of folks would like to make a killing on the stock market but
no one does without studying the market, and of course few make a killing even
when they do study. It's sort of like creating a killer software or hardware
product. Many are called but few are chosen. In short, there's no short cut.
Electronics can be a very rewarding hobby or profession. For me it has been both
for the better part of fifty years. Learning is not easy in any field but
electronics is a fun field to pursue.

Jim

angtengchat,

hello, could anyone explain me the following ?? 1. how do the waves actually travel through air ? ( for eg. waves in a radio receiver )?Sound waves cannot travel thru a vacumn. But I think light waves could, How is this done, could members tell us.

Of course light waves, and all electromagnet waves, i.e. radio, infra-red, ultra violet, gamma, etc. travel in a vacuum, that's how the sun's light and other waves can reach earth since there is no medium that we know of. There is great debate now as to whether light is a wave phenomenon, which requires a medium, or a particle phenomenon, which does not.
I can't tell you how these waves travel, if I could I could be famous.
But as for waves, the idea here is just like water waves. We see the
wave apparently traveling, but only the ripples travel, or appear to.
The water isn't moving much except up and down. Radio waves are
similar, but as I said, as far as we know there is no medium for them
to make waves in. They used to use a term, 'ether', to suggest that
there was some kind of mystical medium for the radio waves to trevel
through. The idea of ether has mostly disappeared, except that the
term is occasionally used, even referring to parts of the internet that
do not use wires, called the ethernet. Many words to say, we don't know.??2. why dont these waves mix up ? how is it that same waves are received after tuning the receiver ??
?Different waves have different frequencies, thats why they dont mix up. We are able to receive because the receiver is tuned to that particular frequency.

That's right and in fact when we WANT frequencies to mix together it takes a circuit that is non linear, i.e. that distorts the waves. When an AM radio receives a signal, the first circuit, the RF stage is tuned to
the signals frequency. Then the signal is converted to frequency that
is common to all signals being received called the 'intermediate frequency' or IF. This is usually 455 kHz. Whether the radio signal
was at 760 kHz,? a clear channel from my original home town of Detroit,
or 1130 kHz, a local talk show station in Milwaukee, they all are converted to 455 kHz. If the RF amplifiers were totally linear this
conversion wouldn't work.
?

Jim

Listed below is an excellent website with one page of text for each project and
many projects. If you have no electronics experience you might find that the
information given is not sufficient. Generally it takes a minimum of training to
do electronics projects. Can you solder, do you know how a transistor works, at
least to the point where you can troubleshoot your project if it doesn't work?



Jim

lupinstel volkh wrote:

Tom,

BASIC Stamps have their purpose I suppose, but $34 per chip is expensive. Compared to $5 for a PIC with more features and greater speed.

Stamps actually contain PICs. Their expense is due to making the programming of them easy for beginners. I'd only recommend them for someone who has never programmed computers before.

-Mike

From: "yahoo" <yahoo@...>

Stan,
I don't know what kind of computer languages you know or what you consider cheap but the Basic Stamp modules by Parallax are what I started with recently. They are programmed in PBasic and are avalible at www.parallaxinc.com. The modules consist of an interpreter chip, a resonator, and an EEPROM chip. A basic stamp 1 module has 8 I/O's and is $34 and a basic stamp 2 module has 16 I/O's and start at $49. They have starter kits that cost more which include a stamp module, instruction manual, and a parallel or serial cable to contect the stamp to a PC, although I just bought the module since the software and documentation to program them is avalible for free download at their web site. They also sell individual parts to build your own basic stamp modules.

Tom

----- Original Message -----
From: Stan
To: Electronics_101@...
Sent: Thursday, October 25, 2001 7:44 PM
Subject: [Electronics_101] programmable microcontrollers


Hello Group,

I would like to learn how to program microcontrollers, but I don't
know which one to pick for starters. I am overwhelmed with the great
variety of manufacturers and technologies on the market. Could
someone, please, recommend something simple and cheap? Even a
microcontroller that would flash a few LED's in response to a button
pressed would be great for me. Thank you.

Stan



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lupinstel,

I saw a good book at the bookstore the other day entitled "Starting Electronics" by Keith Brindley. It doesn't bog the reader down with theory like most electronics books, but rather is based mostly on experiments.

-Mike



lupinstel volkh <lupinstel@...>:

I am new to this group and new to electronics, (aside from the occasional
small repair) I am the kind of person who learns by doing rather then just
reading. So i was wondering if there are any good project books or websites
which would be a good place for me to start. As I said I would rather learn
things by doing rather than starting off with only extensive electronics
laws and theory. Thanks

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As I said I would rather learn things by doing rather than starting >off with only extensive electronics laws and theory.

So would everybody. But it doesn't work that way. You can't smell electric current. You can't see a transistor work. As such, you're completely dependent upon instrumentation, which is something of a mystery in itself.

You will occasionally find people who appear to have learned electronics by just connecting devices on a workbench, but these guys have an instinct for circuitry that most of us do not. The rest of us have to learn the stuff out of a book and confirm it in our minds with laboratory exercises. The lab exercises also teach us to use the instruments and to become acquainted with various sorts of hardware.

Some electrical behavior is fairly intuitive: if you increase the current through a lamp, it'll get brighter. But some phenomena are counter-intuitive: you'll find AC voltages across capacitors and inductors that are higher than your source voltage. (This is how a lot of 'free energy' schemes get started.)

There is, unfortunately, no easy way to learn electronics. If you try to do it without going into the theory, you'll remain stuck a low level where you're connecting parts without understanding why. Then you'll drift off into software and the electronics that makes it all work will remain a mystery.

M Kinsler


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