Are you going to modulate a single RF carrier with AFSK audio tones, or are you going to somehow switch between two RF frequencis with FSK?
It would be nice if I used two separate carrier frequencies and transmit tones and receive them. In fact, I think that method is at least twice as fast compared to transmitting two tones on one carrier frequency.
and because the varactor trick you pointed out has some more success to it, I can use that to switch the frequencies. This is where the digital counter comes in handy :wink:
Don't worry Nigel, I'm not reentering that topic.
This guy here:
**broken link removed**
audioguru must be jealous, because my receiver works, even though he declares it as a "toy". My god, if I gave it to a young kid, he eat the ***n transistors :shock:
Good point!
FM is a very simple way to make FSK. But how would you detect it, it is DC modulation, isn't it?
I have made a VU meter that detects amplitude and lights an LED accordingly.
The problem is that MStechca's transmitter was an AM transmitter
How is it AM? I used and slightly modified the "miniature FM transmitter" found at the university of guelph.
Now he can't afford a real varactor diode...
It isn't the matter of affording it, it is the matter of wise shopping.
I shop at Sayal Electronics, because it is the cheapest store I go to.
They sell varactor diodes at $1 each. they sell normal 1N4007's at about 10 cents each. I would rather screw up 1 regular diode than 1 varicap.
Did anyone tell you that at least 1/2 of us are not real experts?
It is called "Experimenting".
Also he is using an AM receiver.
As long as I can receive almost anything with it, I don't care.