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Old 23rd August 2006, 04:18 PM   #1
mikeks is offline mikeks  United Kingdom
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Thumbs up Excellent Analogue Notes..

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Old 23rd August 2006, 06:19 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi Mike,
no time to read through those enormous documents. Some day I'll have to try and expand my knowledge.


Spotted the frequency chart near the beginning showing Radar as operating from 1MHz to 100Mhz. Surely this is too low?
I thought radar worked in the GHz range, about 10cm or so to avoid some of the rain droplet signal fall off.

Is there a specialised form of Radar that operates at much lower frequencies?
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Old 24th August 2006, 06:09 AM   #3
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Early radar wasn't very high in frequency. I remember seeing WW2 radar equipment that must have been using a frequency around 100 Mhz.

Until a few years ago the Russian army used some sort of "over the horizon" radar that operated in the shortwave range. It was called "woodpecker" by HAMs and other SW users (guess why ?!).

But usually, today's radar equipment works in the GHz range.

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Charles
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Old 24th August 2006, 08:26 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
the WW2 radar used 3cm to 10cm wavelengths to get useful reflections.
This is GHz.

I don't know about the more modern stuff, that's why I asked.
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Old 24th August 2006, 08:39 AM   #5
moamps is offline moamps  Croatia
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radar frequency bands
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Old 24th August 2006, 08:44 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi Mo,
thankyou.
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Old 24th August 2006, 08:57 AM   #7
405man is offline 405man  Scotland
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Details of some WW2 radar can be found here

http://www.westwight.clara.co.uk/CH.htm#top

Radar in the GHz range was developed after the invention of the Cavity Magnitron in 1940

http://www.sciencemuseum.org.uk/on-l.../magnetron.asp

50cm/600Mhz radar was used extensivly in the UK until about 20 years ago and then band was used for CH5 TV. Long range radar then went to 23 cm and most airport radars operate on 10cm with surface movment radars on 3cm and above

Stuart
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Old 24th August 2006, 12:20 PM   #8
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This is an interesting diversion as I was told at a recent hifi show that Lamm amplifiers are designed by an ex-Soviet radar engineer, by the name of Vladimir.
I had the pleasure to listen for some time to the Lamm M1.2 Reference and I have to say it is probably the best commercial amplifier I have ever heard...or not heard. This reminds me I must buy a copy of "Up All Night" by the Waifs.
Is a study of radar a help in audio design? Something to ponder!
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