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Sunday, 16-Dec-2007 17:17:10 PST
I am particularly indebted to Philips Components and Semiconductors Australia in part, for their most generous assistance in giving me access to some of the material presented on this page.
I'm going to leave the rest to see if anybody actually reads these pages and asks me for some oscillator circuits. This would include both fixed and variable oscillators as well as fixed and variable crystal oscillators - all in the HF region.
Note that up in the VHF region it is almost impractical to design variable oscillators, the drift will kill you. I'd recommend using 3rd or 5th overtone oscillators using crystals, see "Figure 9. Typical Application for Cellular Radio" from the 602 mixer PDF data sheet.
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This is a mutual help group with a very professional air about it. I've learn't things. Not for absolute newcomers to ask questions BUT it is an excellent learning resource for lurkers.
602 mixer data sheet - (109K) in PDF format.
NE/SA615 Double Balanced Mixer and FM IF System
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Bibliography: - Philips Semiconductors - Semiconductors for Wireless Communications 1999 - IC17
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