Re: EF50 was Re: radar history
On Mon, 5 Mar 2018, Christian Corti wrote: The EF50 has a Loctal base with eight pins. 5xx is Magnoval. 8x is Noval. Correction: Loctal with nine pins ;-) How crazy... Christian
Re: EF50 was Re: radar history
On Sun, 4 Mar 2018, Nico de Jong wrote: E = 6.3v filament F = Pentode 5x = B9G base .. also known as Noval base No, absolutely not ;-) The EF50 has a Loctal base with eight pins. 5xx is Magnoval. 8x is Noval. Christian
Re: EF50 was Re: radar history
> From: William Donzelli > Germany often gets the short end of the stick when it come to radar > tech in World War 2 For those who are interested in German radar, there's a good book: David Pritchard, "The Radar War: Germany's Pioneering Achievement 1904-45", 1989 which covers their systems in some detail. There's also: Martin Streetly, "Confound and Destroy: 100 Group and the Bomber Support Campaign", 1978 which contains a very interesting chapter about an exercise called "Post Mortem", run immediately after the close of hostilities, from 25 June to 7 July, 1945, in which the Allies observed (from inside) the workings of the German air warning network, including things like how well it coped with various kind of jamming (window, as well as active). Noel
Re: EF50 was Re: radar history
:> The high frequency power tubes were required for better spacial resolution. My understanding was that major difference between the German radar and allied was that the Germans had a single trace, like a time domain reflectometer. The allies had a rotating image that is similar to what we see on current radars, today. Both sides had the displays you describe. The first is called A-scope, and the latter PPI (Plan Position Indication). Consider that early radar, well into the 1950s, was actually pretty horrible. PPI back then often resulted in a screen full of indistinct smudges, so nearly every search radar had the "old" A-scope, where the operator would use a cursor* and get a very accurate range and azimuth reading. Basically, the PPI scope was good for "the big picture" "show me all the information", and the A-scope was good for getting the information that was actually useful. > The cavity tuned magnetron was clearly an issue because it allowed them to > run at a higher frequency than the split plate magnetron. Both were > significant changes in how things were done. Significant, but only sometimes significant. Higher frequencies produced by magnetrons were useful for bombing and gun laying (anti aircraft and naval guns) as it improved range accuracy greatly, but it did nothing for air search radars. VHF radars (with triodes) were still in front line service until the 1950s, simply because they did a much better job at illuminating aircraft. Germany often gets the short end of the stick when it come to radar tech in World War 2, but towards the end, their (non-magnetron) air search radars were some of the best. Why? Because that is what they needed with their skies full of Allied bombers. The graphical real-time cursor and joystick, in one or two dimensions, has its origin in World War 2 radar systems. It is astonishing how many historical accounts of early computer graphics do not mention this. -- Will
Re: EF50 was Re: radar history
The high frequency power tubes were required for better spacial resolution. My understanding was that major difference between the German radar and allied was that the Germans had a single trace, like a time domain reflectometer. The allies had a rotating image that is similar to what we see on current radars, today. The cavity tuned magnetron was clearly an issue because it allowed them to run at a higher frequency than the split plate magnetron. Both were significant changes in how things were done. Dwight From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Nico de Jong via cctalk <cctalk@classiccmp.org> Sent: Sunday, March 4, 2018 7:23:13 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: EF50 was Re: radar history Oh sh..l., It was a bit too quick Apologies... /Nico - Original Message - From: "ANDY HOLT via cctalk" <cctalk@classiccmp.org> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Sunday, March 04, 2018 3:52 PM Subject: EF50 was Re: radar history >E = 6.3v filament > F = Pentode > 5x = B9G base > > Andy -- I am using the free version of SPAMfighter. SPAMfighter has removed 16135 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len Free Spam Filter for Outlook, Windows Live Mail & Thunderbird - SPAMfighter<http://www.spamfighter.com/len> www.spamfighter.com SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
Re: EF50 was Re: radar history
Oh sh..l., It was a bit too quick Apologies... /Nico - Original Message - From: "ANDY HOLT via cctalk" <cctalk@classiccmp.org> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Sunday, March 04, 2018 3:52 PM Subject: EF50 was Re: radar history >E = 6.3v filament > F = Pentode > 5x = B9G base > > Andy -- I am using the free version of SPAMfighter. SPAMfighter has removed 16135 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
Re: EF50 was Re: radar history
.. also known as Noval base /Nico - Original Message - From: "ANDY HOLT via cctalk" <cctalk@classiccmp.org> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Sunday, March 04, 2018 3:52 PM Subject: EF50 was Re: radar history >E = 6.3v filament > F = Pentode > 5x = B9G base > > Andy -- I am using the free version of SPAMfighter. SPAMfighter has removed 16135 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
EF50 was Re: radar history
E = 6.3v filament F = Pentode 5x = B9G base Andy
