Roy Lewallen wrote:
There's no sharing when there's only one user, channel, or LED
involved, so no multiplexing. Except, I guess, for digital types who can
share an LED between a 1 and a 0.

A two-wire serial ASCII RS232 line is time-multiplexed between
marks and spaces, i.e. you can't have a mark and a space occurring
at the same time. :-)

Just out of curiosity, what does your revered IEEE Dictionary have to
say about it?

I'm at the GED office presently. I'll check that when I get home.
--
73, Cecil http://www.qsl.net/w5dxp


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Cecil Moore wrote:
Roy Lewallen wrote:
Just out of curiosity, what does your revered IEEE Dictionary have to
say about it?

I'm at the GED office presently. I'll check that when I get home.

Well, looks like I win. The IEEE Dictionary agrees with you and you
have said in the past that the IEEE Dictionary is wrong. :-)
--
73, Cecil http://www.qsl.net/w5dxp


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Cecil Moore wrote:

Well, looks like I win. The IEEE Dictionary agrees with you and you
have said in the past that the IEEE Dictionary is wrong. :-)

Ah, binary again. I disagree with all entries or I disagree with none,
with no other possibilities. Spoken like a true digital engineer.

Indeed, I often disagree with that book, and don't feel that it does a
very good job of reflecting usage among working engineers. But
apparently on this issue I do agree with it -- a possibility only in my
analog world but seemingly not in your digital one.

Roy Lewallen, W7EL

On Fri, 07 Jan 2005 13:41:29 -0600, Cecil Moore
wrote:

|Roy Lewallen wrote:
| There's no sharing when there's only one user, channel, or LED
| involved, so no multiplexing. Except, I guess, for digital types who can
| share an LED between a 1 and a 0.
|
|A two-wire serial ASCII RS232 line is time-multiplexed between
|marks and spaces, i.e. you can't have a mark and a space occurring
|at the same time. :-)

Baloney. By this definition, OOK Morse is a "time-multiplexed"
system, eh?

Why not just Google this: define: multiplexing

Then try this: define: time multiplexed. And the answer is, "Huh?"

What you mean is that the LEDs are pulsed at some rate and/or duty
cycle. I wouldn't call this, "multiplexing."

|
| Just out of curiosity, what does your revered IEEE Dictionary have to
| say about it?

Took the words right out of my mouth, Roy. I almost asked that in the
previous post.

Wes Stewart wrote:
On Fri, 07 Jan 2005 13:41:29 -0600, Cecil Moore
wrote:

|Roy Lewallen wrote:
| There's no sharing when there's only one user, channel, or LED
| involved, so no multiplexing. Except, I guess, for digital types who can
| share an LED between a 1 and a 0.
|
|A two-wire serial ASCII RS232 line is time-multiplexed between
|marks and spaces, i.e. you can't have a mark and a space occurring
|at the same time. :-)

Baloney. By this definition, OOK Morse is a "time-multiplexed"
system, eh?

Why not just Google this: define: multiplexing

Then try this: define: time multiplexed. And the answer is, "Huh?"

What you mean is that the LEDs are pulsed at some rate and/or duty
cycle. I wouldn't call this, "multiplexing."

|
| Just out of curiosity, what does your revered IEEE Dictionary have to
| say about it?

Took the words right out of my mouth, Roy. I almost asked that in the
previous post.

Time Domain Multiplexing is where two or more signals share one data
pipe. Under TDM each signal is allocated one domain. Each domain is sent
in sequence. At the other end each domain is isolated and combined with
other domains elements from the same source. i.e. a, b, c fragmented and
sent as a1, b1 , c1, a2, b2, c2, a3, b3, c3 received and defragmented as
a, b, c. Commonly used to sent telephone conversations and internet
packets over copper wires and radio.

Dave WD9BDZ

Wes Stewart wrote:

Cecil Moore wrote:
|A two-wire serial ASCII RS232 line is time-multiplexed between
|marks and spaces, i.e. you can't have a mark and a space occurring
|at the same time. :-)

Baloney.

Didn't you ever use an 8 to 1 *MULTIPLEXER* chip to change
parallel BAUDOT to serial BAUDOT? The parallel BAUDOT bits
are time-multiplexed into a serial bit stream by the
three clock bits. The first parallel bit is hard-wired to
yield a start pulse and the last two parallel bits are hard-
wired to yield a stop pulse. The center five parallel BAUDOT
bits are time-multiplexed from parallel to serial by five
states of the clock.
--
73, Cecil http://www.qsl.net/w5dxp


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On Fri, 07 Jan 2005 23:29:16 -0600, Cecil Moore
wrote:

|Wes Stewart wrote:
|
| Cecil Moore wrote:
| |A two-wire serial ASCII RS232 line is time-multiplexed between
| |marks and spaces, i.e. you can't have a mark and a space occurring
| |at the same time. :-)
|
| Baloney.
|
|Didn't you ever use an 8 to 1 *MULTIPLEXER* chip to change
|parallel BAUDOT to serial BAUDOT?

Actually, no. I have however, worked on monopulse RADAR missile
seekers where the requirement for three phase and gain matched
receiver channels (sum, delta elevation, delta azimuth) was reduced to
two by time-sharing one delta channel. You can call this multiplexing
if you want (TDMA?), but as an r-f guy, I have a different take. At
any point in time the only data in the delta channel was *either*
elevation *or* azimuth, not both elevation *and* azimuth. (* maybe a
digital system after all? :-)

|The parallel BAUDOT bits
|are time-multiplexed into a serial bit stream by the
|three clock bits. The first parallel bit is hard-wired to
|yield a start pulse and the last two parallel bits are hard-
|wired to yield a stop pulse. The center five parallel BAUDOT
|bits are time-multiplexed from parallel to serial by five
|states of the clock.

Fine, but how does this support your statement above to which I
responded?

I think I'm catching on tho...in ham terms, a digital multiplexer is
like a two-meter repeater; only one guy can talk at a time. I'm more
familiar with analog multiplexers, a 20-meter DX pile-up for instance,
where everybody talks at once. [g].

Wes Stewart wrote:
Fine, but how does this support your statement above to which I
responded?

The 8-bit ASCII could be generated using a digital multiplexer.
If one had a 10-bit digital multiplexer chip, one could use an
ASCII byte stream into it to generate serial ASCII. That's eight
separate input bit data streams being time-multiplexed into one
output data stream and that comes under the definition of multiplexing.

One problem here is the age of my vocabulary. When I learned and
worked on this stuff, there were digital multiplexers and decoders,
i.e. the word "encoder" was not in common use yet. Reference:
"Fundamentals of Logic Design", 2nd edition, Charles H. Roth, Jr.,
copyright 1979, pages 184-190. "Multiplexers" and "decoders" are
described in detail but absolutely no mention of "encoders" anywhere
in the book. Back then, "encoders" were included in the definition
of "multiplexers".
--
73, Cecil http://www.qsl.net/w5dxp


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This is really funny! On the 5th, someone posted a question about how a dish tracks a satellite, and I told them to go
look up monopulse techniques for the answer and got roundly slapped around the head and shoulders for offering a non
answer. Now, here the three channel monopulse technique appears in a discussion of AUTOMOBILE TAIL LIGHTS for gosh
sakes.

Go figure.

--
Crazy George
Remove N O and S P A M imbedded in return address
"Wes Stewart" wrote in message ...

snip

Actually, no. I have however, worked on monopulse RADAR missile
seekers where the requirement for three phase and gain matched
receiver channels (sum, delta elevation, delta azimuth) was reduced to
two by time-sharing one delta channel. You can call this multiplexing
if you want (TDMA?), but as an r-f guy, I have a different take. At
any point in time the only data in the delta channel was *either*
elevation *or* azimuth, not both elevation *and* azimuth. (* maybe a
digital system after all? :-)


snip more

On Sat, 8 Jan 2005 20:42:05 -0600, "Crazy George"
wrote:
Now, here the three channel monopulse technique appears in a discussion of AUTOMOBILE TAIL LIGHTS for gosh sakes.

Hi George,

A sucker post is how we got there.

73's
Richard Clark, KB7QHC