08-10-2014, 07:11 AM
(This post was last modified: 08-10-2014, 08:01 AM by Radio Fixer.)
Lot of detail in that article you found Lawrence ... I may find time to read it thoroughly. There was a large and excellent article, maybe 3 or 4 years back in Radio Bygones about making modern solid state circuits using the technique.
Here is part of the article I wrote all those years ago. I made PDFs by a devious route using CorelDraw and so skipped the restoration part (well most could have done it). It is my only radio where the chassis goes in from the bottom.
Gil 1.pdf (Size: 37.16 KB / Downloads: 123)
Gil 2.pdf (Size: 44.5 KB / Downloads: 51)
I didn't get any comments to my idea of how the circuit worked so either I was spot on (unlikely) or readers glazed over (most probable).
The second attachment misses a bit in that I asked other US owners of the set how theirs performed and the answer was no better than mine.
At the time I didn't know about the Proximity Fuse invented in the US for WW2 that used the super - regeneration technique . It made a very compact circuit, with high gain, that could be built into the nose of shells so that they could detect the presence of a target and explode without actually hitting it. So Armstrong's invention did find an important use. Somewhere I have read an article and making tubes, components and construction that could withstand the G forces was a major challenge.
Gary
Here is part of the article I wrote all those years ago. I made PDFs by a devious route using CorelDraw and so skipped the restoration part (well most could have done it). It is my only radio where the chassis goes in from the bottom.
Gil 1.pdf (Size: 37.16 KB / Downloads: 123)
Gil 2.pdf (Size: 44.5 KB / Downloads: 51)
I didn't get any comments to my idea of how the circuit worked so either I was spot on (unlikely) or readers glazed over (most probable).
The second attachment misses a bit in that I asked other US owners of the set how theirs performed and the answer was no better than mine.
At the time I didn't know about the Proximity Fuse invented in the US for WW2 that used the super - regeneration technique . It made a very compact circuit, with high gain, that could be built into the nose of shells so that they could detect the presence of a target and explode without actually hitting it. So Armstrong's invention did find an important use. Somewhere I have read an article and making tubes, components and construction that could withstand the G forces was a major challenge.
Gary
