So i need to even use two different demodulators[1) AM 2)FM]. Okay.FM stands for frequency modulation and AM is for amplitude modulation. So for a given radio band only the detectors need to be changed (and perhaps the AGC/limiting circuits). The problem is that FM transmissions are normally on band 2(88 - 108 MHz) and AM on medium waveband (550 - 1602 KHz)
So you need to make a dual band radio set, this is a complex item and I would just stick to a AM superhetrodyne receiver as your first venture.
Frank
But, there were many things that were nearby, why would only a hman being like me would act like antennae. Is there any name for this effect?the person standing by acts like an antenna
it implies that the Radio's antenna is poor and signal in that locality is also weak.
And this happens only in certain FM Stations. So, it might mean that 'those stations are emitting low strength signals' - Am i Right?yes i agree with sarma .if you connect an anteana to the radio then there will have the above said effecj. In FM/AM only the components used according to their frequency range thats why the componet are diffrent .See the frequncy range of both.
I guess that the person acts like a conductor to the ground, which adds a non-ignorable capacitance between the person and antenna of your receiver. And this additional cap makes your antenna match better than without the person standing there. Thus, I think it is due to the man standing at specific position that the antenna matches better. If the person move to another place, the result will change. You can try that.
It far more likely that the other objects nearby are:
.....AM signal conveys the audio by controlling the signal strength, the amount of power transmitted follows the audio waveform while an FM transmission has constant power but shifts up and down the band very slightly in time with the audio.
Brian.
I had forgot to remember that.LW and MW use ground wave
while Shortwaves use even ionospheric reflection principles
Thanks Brian,LW (Long Wave), MW (Medium Wave) and SW (Short Wave) are just names for the lower
......broadcasting in the 88 - 108MHz band, it should really be called 'VHF' not 'FM'.....
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