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On Dec 11, 9:18 am, cmor wrote:
I'm trying to create a largish ferrite receiver antenna tuned exclusively to the 457khz range. I was going to get the ferrite rod from he http://www.stormwise.com/page26.htm As I only need the single frequency I was wondering if it was more effective to make a self-resonant antenna?, or does a capacitor not decrease quality of the single? Secondlly, I have very little experience in the radio world, and was considering following am radio plans similar to this to attach my antenna to:http://www.stormwise.com/page56.htm Just swapping the variable capacitor for a fixed one tuned to my frequency. Is this the optimal way to get the strongest signal? Can anyone point me in a direction to get more information on how to build such a receiver? Most important is the range of the antenna in picking up very weak signals. Thanks, Chris What specific kind of signals are you trying to pick up, and what is it that will prevent you from hearing them? That is, if the signals are buried in atmospheric noise, a more "sensitive" antenna that also picks up more noise as well as more signal isn't going to help the signal-to-noise ratio. For that, you may need to use some additional knowledge about the signal that you can use to differentiate it from the noise. At 457kHz, atmospheric noise is very high amplitude, and it doesn't take much of an antenna plus receiver to get all the signal that will do you any good. On the other hand, if the thing that keeps you from hearing the desired signal is an interfering signal, the null of a loop (or ferrite rod) antenna can be used to get rid of that signal that comes from one direction (which lets you listen more easily to the desired signal, provided your desired signal isn't coming from the same direction). Cheers, Tom |
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