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#7
March 31st 16, 03:13 PM
posted to rec.radio.amateur.boatanchors
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Wig Wag transmitter
On 03/30/2016 09:35 PM, Hank wrote:
And of course superheterodyne and FM...he really knew what he was doing. Armstrong was a major contributor---but whether he actually "invented" the superhet seems to be in doubt, as there was considerable French work in frequency conversion during WWI. No question that Armstrong brought the superhet to the home entertainment market with the RCA Radiolas of the early 1920's. These were really strange beasts, as they used a reflex circuit to reduce tube count. Add to that the "catacombs" construction---a wax-filled can with V99 tube sockets. I had one of these (a "portable") from 1924 as a teenager, and really went through fits to get it to work, after melting all the wax out of the catacomb. That portable had a "loudspeaker" (a headhone-type driver into a horn) and an extra v99 to drive it. Armstrong's FM was really his baby. All the theoreticians said it wouldn't work, but it did. I once worked with an old-timer who'd been involved in setting up the original NTSC TV standard in 1941. They purposely put a hook into RCA's condemnation of FM by specifying FM for TV audio (said he). Thanks for the info, I did not know that. |
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