[ARC5] Zero Beat Question

[Richard Knoppow]

    To the editor, I really can't trim this or no one will know what its 
about.
    Ramsey is a familiar name, what it the title of the book?  I may 
have it.
    Its curious to me that it took so long to recognize that a hetrodyne 
could be used for detection since the phenomenon was known in acoustics 
and music. One reason was perhaps that the only RF generators were high 
power. The use of continuous waves was held back by the lack of a 
detector.

On 7/23/2016 10:27 PM, Fuqua, Bill L wrote:
>    I located a book I have written by R.R. Ramsey on Experimental Radio.
> Very old book around 1929.
>   I read a comment in the preface that was confusing at first and then I realized what
> it was about.
>   It was in regards to frequency mixing and beat notes. Mind you, many formed their
> opinions back in the spark era where a crystal receiver was coupled to another tuned
> circuit connected to a buzzer. The RF from the second tuned circuit and buzzer produced
> a beat note with the incoming signal. In fact Marconi had a patent on a balanced detector
> using a second tuned circuit and buzzer.
>   Quantum Mechanics had just been given birth by Max Plank around 1900 and some
> physics thought the beat note was due to having two tuned circuits which, I am guessing here,
> was like having two energy states and the audio beat note was produced by state (frequency) change
> from the higher frequency tuned circuit to the lower one.
>   However, engineers disproved this but many physicist still believed this for some time. They were
> completely stuck to a quantum mechanics explanation.
>   I am hoping that I can find some other reference to this in earlier books.
>
> 73
> Bill wa4lav

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL