transmission distance in radio communication

[bhuvanesh]

i have bought all the components to make radio transmitter and receiver.but i am week at basics i dont know which factor cause effect on transmission.i mean which decides transmission range

 

[Harald Kapp]

There are many factors:

• transmitted power
• gain of transmittting antenna (including e.g. directionality)
• losses during transmission (attenuation by obstacles like walls, humidity etc.)
• gain of receiving antenna
• sensitivity of receiver
• robustness of the transmission's coding scheme (AM, FM, QAM, ...)
• robustness of any higher layer coding (e.g. use of errror correcting codes etc.)
• accepted signal-to-noise ratio of the received and decoded signal

 

[davenn]

losses in feed lines
and last but not least
the frequency used ( which probably should be at the top of the list)


Dave

 

[shrtrnd]

I'm kind of assuming this is an inside your home device?
A liitle more specific information would help.
Are you working a signal device like an on-off switch, or a communications device, like your own short-range FM radio station?