Re: The transmission range of 0dbm output power

On Apr 22, 11:57 pm, aitezaz....@xxxxxxxxx wrote:
Thanks for you people's replies. Here is the parameters that you
people has asked for,

Currently the channel is AWGN. The transmitter is exactly in front of
receiver but in an indoor environment. So, multipaths are likely but a
strong line of sight exists. ADC is 14 bit. Besides, the noise figure
of the receiver RF front end is 10 dB (in previous post i wrote 5 dB
that is incorrrect). The antenna gain is 2 dbi an omni directional
antenna both at TX and RX. Room temperature is 27 degree celcius.
bandwidth of the signal is 500kHz and on a carrier frequency of 430
MHz. I have used path loss equation but someone told me that this
equation is true for far field and my transmit power is so low that i
cannot use this equation. Besides, the path loss equation gives me a
transmit range of 2 km that it is not supporting at all. Almost 1 feet
away, the scatter plot of the receiver is perfect i.e. beautiful dots.
But, as soon as I increase the separation beyond 3 feet, the scatter
plot shows destruction.
Even a rough guess would be fine. I just want to make sure that this
much distance is justified.
Thank you again for your time.

How much power do you need at the input of your 14-bit ADC to produce
a full scale digital output? Also, make sure that your antennas and
input/output connections are impedance matched.

Darol Klawetter
.

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