Highest freq oscillators

[Watson A.Name - Watt Sun]

So the limitation will be I think the wire, not the components... Anywhere
above 40 to 60GHz you will have great difficulties to find a "wire" that
will conduct your signal, except on very very short distance. But if you
accept more exotic transmission medium, like planar waves in a tube, then
100 to may be 200GHz seems achievable these days. The only problem will be
to find a device to detect it...

That's easy to do. Freqs that high have wavelengths that are almost
in the long wave infrared band, so they can be felt as heat on the
skin. Or they can be detected by a bolometer. Now _that_ is old
technology. http://www.1upinfo.com/encyclopedia/B/bolomete.html

Robert

If you consider light waves to be oscillations then UV LEDs would be the

winner.

OK, OK, I guess a rephrase is in order...

I only mean oscillations of current in a wire, not electron clouds in
mercury atoms! (or something)

And by "normal" components, I meant thing like semiconductors, crystals,
etc., as opposed to klystrons [sic] and that kind of thing. I guess it's a
matter of opinion where you draw the line, though.

Thanks,
Robert

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[Watson A.Name - Watt Sun]

How about the oscillators in satellite receivers - must be about 10 GHz
or so. Millions of these are in use.

Satellites in the Ka band are 30 GHz.

Leon

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[Watson A.Name - Watt Sun]

And I guess you can't exactly use TWT for communications? Or can you? :-S
http://www.nec-mwt.com/english/twt_es.html

Thnaks,
Robert

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[Active8]

On Tue, 14 Oct 2003 20:00:34 -0700, Watson A.Name - "Watt Sun"

If you consider light waves to be oscillations then UV LEDs would be the
winner.

OK, OK, I guess a rephrase is in order...

I only mean oscillations of current in a wire, not electron clouds in
mercury atoms! (or something)

And by "normal" components, I meant thing like semiconductors, crystals,
etc., as opposed to klystrons [sic] and that kind of thing. I guess it's a
matter of opinion where you draw the line, though.

those Klystrons and magnetrons are used because they put out way more
power than the semiconductor oscillators and they're tuned cavities.

The reflex klystrons that are the size of the tubes in a tube radio
put out well under 1 watt. See http://www.tubecollector.org/707b.htm

i've got a freq/power chart of klystrons from .1W to 200W. hadn't
visited that in a while.

pretty cool antique. maybe one day i'll have time to play with tubes.
some people don't even realize they are still used in new designs. did
(does) fender ever(even) make a solid state amp?

Not necessarily. Here's a publiation that talks about a Gunn diode
that puts out 45 GHz.
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980ITMTT..28.1460M

didn't i mention Gunn diodes below? couldn't remember how high they went
in freq, but...

Here's a 120 GHz HEMT oscillator. Now, that's prtty high freq. If
you go much higher than that, you are in the low end of the infrared
band.

where?

i forgot about HEMT.

mike

 

[Rene Tschaggelar]

But the light is not a pure frequency, it is not monochromatic like a
laser is. A regular blue or UV LED has a purer, less polychromatic
output than a light bulb, but a laser is truely monochromatic.

No, it is not.
The gainmedium has a certain bandwidth connected to the upperstate liftime
and some solidstate geometry factors. The resonator allows multiple
axial modes.
Depending on how the resonator is built, a multitude of the them
is under the gain curve.
Having just one wavelength is extremely hard to achieve.
A usual HeNe has the modes beat in the few 100MHz range.
When you touch it, the beat frequency move.

Rene

 

[Ian Buckner]

If you consider light waves to be oscillations then UV LEDs

would be the
winner.

OK, OK, I guess a rephrase is in order...

I only mean oscillations of current in a wire, not electron clouds in
mercury atoms! (or something)

And by "normal" components, I meant thing like semiconductors, crystals,
etc., as opposed to klystrons [sic] and that kind of thing. I guess it's a
matter of opinion where you draw the line, though.

The next time you walk thru an automatic door, look up at that small
box above it, which has a microwave oscillator in it. This is usually
a Gunn diode or IMPATT diode in a cavity. It might oscillate in the X

band.

Thanks,
Robert

--

Another high volume application on the way is vehicle collision
avoidance radar, which will be up in the 70GHz band.

Regards
Ian

 

[N. Thornton]

That's easy to do. Freqs that high have wavelengths that are almost
in the long wave infrared band, so they can be felt as heat on the
skin. Or they can be detected by a bolometer. Now _that_ is old
technology. http://www.1upinfo.com/encyclopedia/B/bolomete.html

A bolo-meter: was that what we used on news2020?

And if so, would that make his output in the 100 - 200 GHz region?


Regards, NT

 

[Fred Abse]

Abandon wires and you're in TWT (traveling wave tube)

TWTs have a wire helix inside. that's how they get a "slow wave".

So do BWOs

 

[Watson A.Name - Watt Sun]

No, it is not.
The gainmedium has a certain bandwidth connected to the upperstate liftime
and some solidstate geometry factors. The resonator allows multiple
axial modes.
Depending on how the resonator is built, a multitude of the them
is under the gain curve.
Having just one wavelength is extremely hard to achieve.
A usual HeNe has the modes beat in the few 100MHz range.
When you touch it, the beat frequency move.

Rene

Oops, I meant truly. Ok, so the light is coherent. After all, that's
what lasers do. But compared to other types of light, it's closer to
being monochromatic. & I had Ss lasers in mind, not HeNe.



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[Ben Bradley]

In sci.electronics.design, Watson A.Name - "Watt Sun"

A Laser, with the shortest wavelength. What's that? UV? Blue?

I thnk he means using normal "electronic" components. There's the
Magnetron oscillator in a microwave oven.




.... and what a tagline...

 

[Roy J. Tellason]

Hm, now I wonder what it'd take to use that scrap microwave oven for a
communications device? And what sort of range I'd get...

 

[t.hoehler]

:-S

Hm, now I wonder what it'd take to use that scrap microwave oven for a
communications device? And what sort of range I'd get...

Why, RadarRange, of course! ;-)
/regards,
Tom

 

[Rene Tschaggelar]

Hm, now I wonder what it'd take to use that scrap microwave oven for a
communications device? And what sort of range I'd get...

Not very far when it rains, even with 1kW.

Rene