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Variable selectivity?
"Michael Black" wrote in message
xample.org... On Sun, 13 Oct 2013, gareth wrote: Further information most welcome, thank-you In the 1948 Radio handbook which I mentioned previously, there are adverts from a company by the name of Millen, and I assumed it was the same guy after he had left National. Your comment about a phenolic intersperser is no doubt some means of isolating an earthy contact? It would be interesting to know from the Lamb patent whether he proposed therein the technique of Single Signal Reception by the use of the phasing control to null out the audio image, or whether this was something that came about through experience? ONce again, "single signal selectivity" is credited to the Lamb filter, everyone referencs that famous QST article of his. You don't need the phasing control to get the single signal selectivity. Incorrect. If the Xtal alone gave you single signal reception, then there'd be no advantage whatsoever in having the phasing control. That the phasing control can be used to null out other signals is the strong indication that more than the one signal is getting through the Xtal. Single Signal reception is the reference to the audio image being phased out. |
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