100W Audio Amplifier

[Michael A. Terrell]

Eeyore wrote:

"Michael A. Terrell" wrote:

Eeyore wrote:
"Michael A. Terrell" wrote:
Eeyore wrote:

Yes it was.

You are easily entertained.

Radar is indeed entertaining.

It was, for a few weeks when I was in Jr. high school. I worked in a
building with a pair of 2 MW Westinghouse RADAR systems while in the US
Army. It was nothing but rack after rack of tubes and a half dozen techs
working around the clock to keep both systems working. It was hot,
noisy, and boring.

This wasn't. It was microprocessor controlled and low power by your
standards. It was popularly know as 'the Rine River Radar' It has 50%
'look-ahead' too btw.
http://en.wikipedia.org/wiki/Rhine

The job was for Kelvin Hughes.
Their then Managing Director is one of my referees. He's moved on a bit
since !
http://www.ibd-uk.com/members/jones-martin.htm

Qualifications:
B.Sc. (Tech), M.Sc., Ph.D. Chartered Physicist. Member, Institute of
Physics, Institute of Acoustics, Audio Engineering Society.
Languages: rusty French and a little German.

A damn nice guy too. We still keep in contact.

Graham

You just don't get it, do you? You and your buddies aren't
interesting.

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Can they compensate for doppler distortion of a LEO satellite, and
recover the data a full five minutes faster than the standard designs?
That is, while the bird is still over the horizon?


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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Eeyore]

"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data in r,
theta coordinates was interesting though.

Graham

 

[Eeyore]

"Michael A. Terrell" wrote:

Idiots are 'blown away' with lots of shiny beads & baubles. Anytime I
want to remind myself why I got out of audio all I need to do is visit
the only place in the are that repairs pro audio and look at the inside
of that chrome & plastic.

PRO audio isn't chrome and plastic. That's MI.

Graham

 

[Michael A. Terrell]

Eeyore wrote:

"Michael A. Terrell" wrote:

Idiots are 'blown away' with lots of shiny beads & baubles. Anytime I
want to remind myself why I got out of audio all I need to do is visit
the only place in the are that repairs pro audio and look at the inside
of that chrome & plastic.

PRO audio isn't chrome and plastic. That's MI.

Graha

Yawn...................................................


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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Michael A. Terrell]

Eeyore wrote:

"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data in r,
theta coordinates was interesting though.

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.


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your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Eeyore]

"Michael A. Terrell" wrote:

Eeyore wrote:
"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data in r,
theta coordinates was interesting though.

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

Yes, I've seen one of display units of that sort.

Precious little other way it could be done then for a PPI. I was stunned to discover
the concept was dreamt up in the late 30s IIRC.

Graham

 

[Michael A. Terrell]

Eeyore wrote:

"Michael A. Terrell" wrote:

Eeyore wrote:
"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna or
array. Its all been done by multiple groups for over 60 years. Adding a
microprocessor is no big deal. That has been done to almost anything
with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data in r,
theta coordinates was interesting though.

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

Yes, I've seen one of display units of that sort.

Precious little other way it could be done then for a PPI. I was stunned to discover
the concept was dreamt up in the late 30s IIRC.

Can you imagine the design review? YOU WANT TO DO WHAT?????????


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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Rich Grise]

On Sun, 28 Dec 2008 12:16:27 -0500, Michael A. Terrell wrote:

Eeyore wrote:
"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a
pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna
or array. Its all been done by multiple groups for over 60 years.
Adding a microprocessor is no big deal. That has been done to almost
anything with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data
in r, theta coordinates was interesting though.

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

In the ones I've seen diagrams of, all that they rotated was the yoke.

If you rotated the whole CRT, it would have one trace on the same line
of the screen forever, until it burned the phosphor off. =:-O

Cheers!
Rich

 

[christofire]

"Rich Grise" <rich@example.net> wrote in message
newsan.2008.12.29.20.07.53.863739@example.net...

On Sun, 28 Dec 2008 12:16:27 -0500, Michael A. Terrell wrote:
Eeyore wrote:
"Michael A. Terrell" wrote:

Basic RADAR is less complex than a $10 B&W TV set. You send a
pulse.
You receive a pulse, which is 'detecting'. You measure the delay for
"ranging'. To get relative position data you use a steerable antenna
or array. Its all been done by multiple groups for over 60 years.
Adding a microprocessor is no big deal. That has been done to almost
anything with electrons for almost 35 years.

Doing it with a resonant spiral scan system on the tube to keep the data
in r, theta coordinates was interesting though.

Not as much as the mechanical system that rotated the CRT. 400 Hz
Syncros at the antenna and display unit were used to keep them locked.
Considering what was available at the time, THAT WAS REAL ENGINEERING.

In the ones I've seen diagrams of, all that they rotated was the yoke.

If you rotated the whole CRT, it would have one trace on the same line
of the screen forever, until it burned the phosphor off. =:-O

Cheers!
Rich

.... and there wouldn't be a PPI 'map' on account of the persistence of the
phosphor. (Relatively) inexpensive marine radars used to employ rotating
scan coils and yoke around the neck of a longish-persistence CRT, using slip
rings, before they became computerised. I remember a model that
(remarkably) used shaded-pole induction motors and nylon gears at the
antenna head and the tube neck, with 60 Hz or thereabouts generated locally
and a microswitch 'zero-degree' sensor at each end to get them started in
sync - and maybe to put things right if the angular error became too large!

Chris