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Is it true? This transmitter works at around 96 MHz to 100 MHz, not higher or lower. But I can receive the signal by using a super regen receiver which can also receive a few radio station. The digital radio from my mp3 player can receive the signal too. I didn't try the max distance, but it works trough wall and around 10 meters tested.JimB said:Because the coils are so large, could it be that the transmitter is actually on about 45 to 50 Mhz and when Banana can hear the tx on an FM radio he is actually hearing the second harmonic?
JimB
JimB said:Because the coils are so large, could it be that the transmitter is actually on about 45 to 50 Mhz and when Banana can hear the tx on an FM radio he is actually hearing the second harmonic?
JimB
audioguru said:Don't larger coils make the inductance lower because the coupling between the turns is lower? The larger coil is approaching being just a long piece of wire.
Hero999 said:Isn't the the Q factor the ratio of resistance to inductance?
So a 100nH inductor with a resistance of 1mhm: has the same Q as a 1:mu:H inductor with a resistance of 10mhm:.
bananasiong said:Hi,
Another question. For LC tank circuit, usually I fix the L and use a trimmer cap to tune. Is it good to use larger L so that it won't be so sensitive when I tune it? For example 30 MHz:
A 12 pF trimmer with a 2.3 uH
A 33 pF trimmer with a 850 nH
which one is preffered? or both are the same?
EDIT: I have a 300 MHz crappy rf module that uses cmos oscillator as the modulating signal, doesn't the output of the cmos oscillator produce square wave? Can the square wave being modulated?
Thanks