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| To: | "LF-Group" <[email protected]> |
|---|---|
| Subject: | LF: something for the weekend ?? |
| From: | "Alan Melia" <[email protected]> |
| Date: | Fri, 25 Apr 2003 15:29:18 +0100 |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
Hi Andy, I am afraid my Terman "Radio Engineers Handbook" 1943 Page 19 gives Sin(A).Cos(B)= Sin(A-B)+Sin(A+B) ....if we forget about the 0.5 factor. but it agrees on the others. This gives you Cos(A-B) + Cos(A+B) out of the top after the 90deg. phase shift and Cos(A-B) - Cos(A+B) out of the bottom ....again cancelling one sideband. I was toying with the idea that Sin(A+pi/2)=Cos(A) but Cos(A+pi/2)= -Sin(A) but that seems irrelevant. Cheers de Alan G3NYK [email protected] |
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