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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: Thomas A Watson who wrote (12406)	5/7/2007 8:00:00 PM
From: maceng2	Read Replies (1) \| Respond to of 36917

If you don't hear signal, the radio is not really tuned Yeah, I suppose you are right. The speaker would be part of the tuning circuit too, you wouldn't hear squat without that, as would be the aerial. In fact, we are lucky it's a nice simple circuit otherwise we would have to include all sorts of stuff as part of the tuning circuit. Regarding the circuit manufacture, no I didn't draw the wire from a lump of copper, but I did wind the inductor and manufacture the variable tuning capacitor. I had back up components pulled out from old radios from the local dump site just in case, and switched them in and out to see if any difference was made. My home made components worked which was the point of the exercise. The aerial design (it's natural resonant frequencies) did do a big part of the tuning, the tuning circuit could only change the frequency by about +/- 10% if I remember correctly. The house where I lived was almost at sea level, the construction of the aerial was the biggest part of the project by far.