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Post by DaveC on Aug 12, 2014 9:36:44 GMT
I'll swap my three gold stars for your five girly ones ?
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Post by DaveC on Aug 12, 2014 7:30:41 GMT
Very sad. I loved Mork & Mindy, well Mindy quite a lot ! 36 years ago, doesn't time fly ? Nanu Nanu !
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Post by DaveC on Aug 11, 2014 8:36:10 GMT
Mmm : editing and quoting defeated me ! My view :
RDF : A "passive navigation" system that any number of people can use simultaneously
Radar : An "active detection" system that in essence only one person can use at a time
Mixed systems : Are where an issue lies as they are sometimes juxtapositioned
History : Often not as remembered correctly
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Post by DaveC on Aug 11, 2014 8:10:54 GMT
Barry said : a) The Germans were using radio waves to guide their bombers at the beginning of WW II. There were rumours that these radio beams were some sort of 'death ray'.
b)Several countries had already experimented with the idea of using the reflection of radio waves by metallic objects as a means of detection.
a) Wasn't this RDF though ? Although automated, not Radar ? This was using a "passive" RF beam to navigate from, as opposed to the "active" detection by "transmit and return" Radar ?
b) You might say Radar was invented in 1904, from the net : "The German inventor Christian Hülsmeyer was the first to use radio waves to detect "the presence of distant metallic objects". In 1904 he demonstrated the feasibility of detecting a ship in dense fog"
My memory of people who were around at the time, and radio people in the 60's were only too keen to share their war experiences, was that Germany had it first in WWII, but the UK got it to work more reliably ?
Whilst writing this I have just re-read Arthur C Clarkes "You're on the Glide Path - I Think" where he talks about the "blind approach" landing system. This seemed to use Radar so that the airfield could ask the pilot to get close by detection, and a sophisticated DRF for the pilot to navigate and to land by.
If I had all day I would crack this, but customers await................. Barry ??
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Post by DaveC on Aug 11, 2014 7:32:07 GMT
If you smashed into a surfboard with a U1 or U2 on the surfboard would come off worse!! Love the Sinn technology. Although it's only half the weight of 135 vs 286g of the Nixon, I would swap as it's even rarer and all but 10 times the cost !! And I thought I only wanted an Omega N.A.S.A. space qualified watch..........................
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Post by DaveC on Aug 10, 2014 20:28:37 GMT
The Nixon is too, so if you smash onto a surfboard the knobs are better protected
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Post by DaveC on Aug 10, 2014 20:26:20 GMT
There is a rumour that the Germans had Radar before WWII and we just perfected it not invented it? The net isn't too good on research in this area and is often conflicting.
Whatever, the bulk manufacturing of electronics in WWII helped shape the world thereafter.
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Post by DaveC on Aug 10, 2014 20:11:15 GMT
Wow! Submarine steel, what is that ? Ah ! found it 1.55 better that 316 stainless, now that is cool......
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Post by DaveC on Aug 10, 2014 20:06:50 GMT
Just a bit ! Longlete and Woburn rallies are no more ? Dayton is still good but a bit of a trek
Men in a shed hobbies are all but dead.
Munich ?
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Post by DaveC on Aug 10, 2014 18:51:28 GMT
Can't find the 665i or the U series, can you give us link. They seem to do a GPS one too but can't find it.
A great new discovery !
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Post by DaveC on Aug 10, 2014 18:40:02 GMT
There wasn't much for the average person though. Virtually no young people and no pretty women........
I suspect the whole genre seems to be dying, well here anyway ?
We did get a discount for arriving late though !
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Post by DaveC on Aug 10, 2014 16:35:10 GMT
Today at the Kinsbridge Vintage Working Rally a 1918 Fairbanks Morse Z Type stationary engine and a 1/4 scale model, both were working !
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Post by DaveC on Aug 10, 2014 10:59:52 GMT
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Post by DaveC on Aug 10, 2014 9:35:59 GMT
The one on the left is identical to Martins on the first post but in white/gold (still the essential VHP version though). And on the right a 286gm stainless surfers watch. Yes they are that different in size ! Or to put it another way, the Nixon is simply massively huge !
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Post by DaveC on Aug 9, 2014 12:52:35 GMT
Yes, in my experience batteries exhibit electrical noise from the chemical activity. And usually they need a regulator which sort of defeats the whole point, even if it was valid ? My Meguro MN-446 Noise Meter www.soundhifi.com/test.html has as the bottom range 10uv FSD and can be used as a preamplifier for other equipment. So when the boards arrive I can check them out.
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Post by DaveC on Aug 9, 2014 10:59:02 GMT
The primary heat conduction path for the QFN (RGW) package is through the thermal pad to the PCB. The thermal pad should be soldered to a copper pad area under the device. This pad area should then contain an array of plated vias that conduct heat to any inner spreading plane areas or to a bottom-side copper plane.
That would work. I think it's more useful for DAC's and preamplifiers rather than high current. In fact where places really need low noise.
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Post by DaveC on Aug 9, 2014 9:16:57 GMT
Not yet, I'm going to order a few dev boards on Monday.
It could revolutionise DIY as it seems to do absolutely everything including 1A ! I think the only issue is heatsinking if used at high current.
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Post by DaveC on Aug 9, 2014 8:30:11 GMT
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Post by DaveC on Aug 7, 2014 8:37:43 GMT
No, but musical industry people often listen on studio nearfeild systems. It's great such a luminary has come into the real world ?
You could say anything I post is an advert, so I'll get my coat now. Such a shame.............
Dave
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Post by DaveC on Aug 7, 2014 7:50:11 GMT
Never say never !
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