radar stoty

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John Larkin         Highland Technology, Inc 
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John Larkin
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That's quite some stoty you found there.

Reply to
bloggs.fredbloggs.fred

Sorry to disturb you. We know that you're not interested in electronics.

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John Larkin         Highland Technology, Inc 
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John Larkin

Poor little thumb-sucking baby bloggs... just needs attention... or he goes into shrill caterwauling ;-) ...Jim Thompson

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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Jim Thompson

I don't know that the Germans were noted for innovations in radar technology. Did they even hit on synthetic yet? You know they were struggling if they were stealing American and British work.

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bloggs.fredbloggs.fred

Den tirsdag den 22. august 2017 kl. 22.08.22 UTC+2 skrev John Larkin:

a bit about WW2 radar

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Reply to
Lasse Langwadt Christensen

I never learned to type. It hasn't done me much harm.

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics
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John Larkin

As judged by John Larkin, who thinks that anthropogenic global warming is an academic hoax.

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Bill Sloman, Sydney
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bill.sloman

We were doing the same. That is the whole point of the story.

Freya was more advanced and higher frequency than the UK air defences which is why they wanted to snaffle parts of it.

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It also had coverage gaps which was perhaps fortunate for us.

Germany had some pretty good kit actually but they didn't have the Randall & Boot 10kW magnetron (a device so secret that the prototype sent to the US with plans would have been dropped overboard and/or the ship carrying it scuttled to prevent it from falling into enemy hands).

The Germans had Lorenz AG with a pretty considerable expertise in blind landing and gun control radar for anti aircraft which was Freya and also Enigma. Their anti aircraft was never quite good enough fortunately for us. Never under estimate your enemy's capabilities.

Steerable Wurtzberg antennas were very nice steerable dishes for their day (and one was still in service at MRAO Cambridge for finding transient sources of terrestrial interference as late as the 1980's). They were very well engineered.

ISTR Westerbork got most of the rest and founded a radio astronomy facility in Holland at a former transit camp. Some went to military use and others dispersed to astronomy groups in Europe and the US.

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Regards, 
Martin Brown
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Martin Brown

Yes, the German radar was technically far superior to Chain Home but CH won by being widely deployed and better integrated into command systems.

To synchronise Chain Home transmissions so nearby stations did not interfere without the expense of a separate synchronization channel the penny wise designers used the national grid 50c/s mains supply: each CH triggered at 25c/s PRF at a phase shifted instant of the grid.

Not only did German radar use much higher radio frequency but the PRF was higher. German prewar radio espionage had detected CH but because it sounded nothing like their radar and was tied to the supply grid they assumed it was part of the electricity supply infrastructure and not military. Only later did they realize the true significance.

piglet

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piglet

However, magnetrons were flown in pathfinder missions for bombing raids over Germany which resulted in one being captured rather sooner than might have been desired. Magnetrons are almost indestructible - even a mangled cavity and magnet would be distinctive enough to give the idea away. This was despite the objections of some of those involved in radar development who wanted to keep the magnetron secret for as long as possible because of its benefits in night-time submarine detection. Submarine periscopes and snorkels could be detected while the submarines were recharging their batteries allowing them to be attacked.

Soon after the first magnetron was captured German submarines were fitted with radar detectors which operated at higher frequencies, allowing them to submerge as soon as they detected the radar signals.

John

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jrwalliker

If you liked that then you might also enjoy the description of the earlier action against the Wurtzberg dish radar installation.

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They managed to grab most of the key parts. Dish was way too big to take away but conveniently had a specifications plate they photographed!

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Regards, 
Martin Brown
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Martin Brown

Good books:

Three Steps to Victory by Robert Watson - Watt The Inventor and the Pilot by Dorothy Varian The Invention that Changed the World by Robert Buderi

The MIT RadLab Series

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics
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John Larkin

I'd add Boffin by Robert Hanbury Brown and Radar Days by E. G. "Taffy" Bowen. (IIRC you have both of those too--I first ran across the Bowen book at your place iirc.)

Cheers

Phil Hobbs

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Dr Philip C D Hobbs 
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Phil Hobbs

All those books are BULLSHIT, not worth the paper they're printed on.

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bloggs.fredbloggs.fred

sary_pourville_raid/

I wouldn't believe a single account coming out of those research establishm ents in the 40s. People back then were horrendous liars and there was alway s a less than altruistic ulterior motive to anything they said or published . In this case it was most likely more funding. The same bunch of worthless parasitic scum in this country had the president scared to death about the German nuclear bomb program, when post war findings were that they had no nuclear program whatsoever!

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bloggs.fredbloggs.fred

Have you read the Varian book? It's not very technical, but it is a fascinating picture of pre-war California, the Theosophist settlements, academic snobbery at Stanford, and the early days of Silicon Valley.

I could send you one (not the copy signed by Dorothy... I wouldn't ship that one.)

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John Larkin         Highland Technology, Inc 

lunatic fringe electronics
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John Larkin

Sure, sounds like fun, thanks.

(I'm not as down on FE Terman as they were, by all accounts--I used to know his son Lew slightly, studied in a building named for him, and heard generally good things from folks who knew him BITD at Stanford.)

Cheers

Phil Hobbs

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Dr Philip C D Hobbs 
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Phil Hobbs

I'm continually impressed by the enormous range of things that you have no interest in. Like, everything.

Add this to your list of dislikes:

The Deadly Fuze by Baldwin.

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John Larkin         Highland Technology, Inc 

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John Larkin

Total crap written by that APL shill bullshit artist astronomer.

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bloggs.fredbloggs.fred

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