I don't understand what batteries have to do with an antenna.
I fear we may have a language problem. The usage of antenna that I know is that it is a conducting structure that picks up or transmits radio waves.
For transmission it is connected to a transmitter. Do you want to also build a battery powered transmitter?
For reception it is connected to a receiver.
A classic loop antenna is one wavelength in circumference. At 475kHz, this is about 600m, which is fairly large. AM radios often use a ferrite loaded loop, which is much physically smaller, and can be bought into resonance with a tuning capacitor.
I fear we may have a language problem. The usage of antenna that I know is that it is a conducting structure that picks up or transmits radio waves.
For transmission it is connected to a transmitter. Do you want to also build a battery powered transmitter?
For reception it is connected to a receiver.
A classic loop antenna is one wavelength in circumference. At 475kHz, this is about 600m, which is fairly large. AM radios often use a ferrite loaded loop, which is much physically smaller, and can be bought into resonance with a tuning capacitor.
elfotony said:
The battery powers a FET buffer with another gain stage to compensate for a physically small loop.
This page has many links to loop antenna design:
http://www.frontiernet.net/~jadale/Loop.htm
Frank
than's you.
I know that my english is not good, but I'm trying to improve it.
The question is: I've a continuous power alimentation and I wont to transmith a wave of 475kHz (and recive it). I don't know if a qarz oscillator cuold help me. And if yes, i don't know the way for a correct construction. I want to transmit some bites in a sistem point to point for some analisys.
Thank's.
Sorry for my engl. but I'd never studied it.
I know that my english is not good, but I'm trying to improve it.
The question is: I've a continuous power alimentation and I wont to transmith a wave of 475kHz (and recive it). I don't know if a qarz oscillator cuold help me. And if yes, i don't know the way for a correct construction. I want to transmit some bites in a sistem point to point for some analisys.
Thank's.
Sorry for my engl. but I'd never studied it.
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