Michael - thanks for these excellent and tidy thumbnail explanations
and histories. I guess I've long *sort of* known about these things,
but your concise posts encapsulate them beautifully and make them very
concrete.

Bruce Jensen

It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

OK, I'll bite - why is this important in a world of radios that operate
on the heterodyne basis? And what makes a linear device different?
Are any commonly used radios linear devices?

Seriously!

Non-electronics guy Bruce Jensen

Maybe so,but I have an Allied Radio catalog here,the 1941 Spring Summer
issue of the catalog and many of the radio ads in the catalog (which I
am looking at right now) do say things about Superhet (Superheterodyne)
and S-P-R-E-A-D band tuning and Regen and super Magna Beam antennas.
cuhulin

Sometimes Cuhulin it is NOT who came up with invention first, but who
patented it (if such were available) and who best promoted it and marketed
it successfully.


Case in point
Marconi is credited with the invention of wireless (radio) 1895
and he was very good at promoting and marketing.

Others say it was Tesla.
By early 1895, Tesla was ready to transmit a signal 50 miles to West Point,
New York see URL:
http://www.pbs.org/tesla/ll/ll_whoradio.html

But one Mahlon Loomis did a successful wireless experiment in 1868 before
Marconi was born - 1874.
You can read about it at URL:
http://www.smecc.org/mhlon_loomis.htm

Few today have heard of Mahlon Loomis. Perhaps the world wasn't ready.



--
CL -- I doubt, therefore I might be !






wrote in message
...
www.devilfinder.com Old Superheterodyne Shortwave Radio
Advertisements

Shortwave History on the Net Stubblefield's Wireless.As many old,old
Superheterodyne Shortwave Radio advertisements as I have seen in
magazines and catalogs that date back to the 1940's and earlier,I know
they were eschewing the advantages of Superheterodyne Shortwave Radios,I
saw those old advertisements with my very own eyes,there isn't anything
wrong with my memory.The Wright Brothers did not invent the first engine
powered Aircraft either. www.devilfindr.com First Aircraft Flight
Pittsburg Texas
I once
read an article about probally Alexander Graham Bell didn't invent the
first Telephone,the article said a German guy in Germany did.Do you know
who really invented the first transistor? www.devilfinder.com Who
really invented the first transistor?

Eli Whitney didn't invent the Cotton Gin,Mrs.Green did.History is full
of Mishistory.
cuhulin

David wrote:


It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

Yeah, that's extremely important all right. *yawn*

Yep,I see what you mean.There is an article at
www.globalnewsmatrix.com about,Patent issued for anti.gravity device.
The guy may have a patent for an anti-gravity device,but he certainly is
not the first to invent or "discover" such a device,not by a long shot.I
have some old Popular Mechanics and Popular Science magazines here and
some of the magazines date back to about 1911 or before.One of the
magazines which dates back to around 1911 has an article about a
radio/vacuum tube a guy invented and the article goes on to mention that
within a very short distance of the tube,there is a flux that could lead
to the invention of an anti-gravity device.There is a company near
Huntsville,Alabama which has also created anti-gravity techonology
devices and a few years ago,I read an article about Boeing Aircraft
company claims to have anti-gravity devices too.Anti-gravity can not be
invented though,devices that can take advantage of anti-gravity can and
have been invented.
cuhulin

wrote in message
ups.com...

David wrote:


It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

Yeah, that's extremely important all right. *yawn*


Let us hope your stereo hi-fi amplifier doesn't go non linear on you
(;-)

coustanis wrote:
....and what does it sound like?
I used to think it was a type of radio but since reading this group
I see it is a sound.

Thanks,
C-


homosexual from holland. nope that would be a homodane! dammit!

On 10 Nov 2005 12:15:10 -0800, "bpnjensen"
wrote:

It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

OK, I'll bite - why is this important in a world of radios that operate
on the heterodyne basis? And what makes a linear device different?
Are any commonly used radios linear devices?

Seriously!

Non-electronics guy Bruce Jensen

An RF Preamp and Active Antenna electronics are 2 places where you
have a need for a linear active device.

On 10 Nov 2005 14:05:42 -0800, wrote:


David wrote:


It's very important to point out that 2 different frequencies, when
mixed in a perfectly linear device, will not beat.

Yeah, that's extremely important all right. *yawn*

It's an important concept in the radio world.