transmission distance in radio communication

[bhuvaneshnick]

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

 

[Ramussons]

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

Everything decides the "range". Frequency, Output Power, Receiver Sensitivity, Antenna Height, Antenna Gain, Terrain Profile, Type of Data, Bandwidth, Modulation Technique, . . . . . (have I left out anything else? )

It's difficult to answer your question at this stage. What do you want to transmit? What is the expected Range? If this is known, then we have a starting point to proceed from.

Ramesh

 

[bhuvaneshnick]

my transmitting distance is just 2 or 3 meter.i am new to this.so first want to make a led on and off by switch via radio waves.

 

[JimB]

i have bought all the components to make radio transmitter and receiver

Well, what components have you bought exactly?

The components you have very much defines the characteristics of the radoi which you can build.

JimB

 

[bhuvaneshnick]

on reciever
PC Board
Toroid Core (AL=25)
3x 2N2222 Transistors
1x 555 Timer
2x 2.2MΩ Resistor
2x 180kΩ Resistor
2x 100kΩ Resistor
4.3kΩ Resistor
560Ω Resistor
2x 100Ω Resistor
100uF Capacitor
4.7uF Capacitor
3x 0.1uF Capacitor
2.2nF Capacitor
47pF Capacitor
27pF Capacitor
1x 5mm Red LED
1x 5mm Green LED
Magnetic Wire (AWG 24/26)
Antenna Wire (AWG 26/28)
+9v Battery Connector
Ferric Chloride
Clothing Iron
Solder
Soldering Iron


On transmitter
PC Board
27.145 MHz Crystal
2x 2N2222 Transistors
1x 555 Timer
100kΩ Resistor
22kΩ Resistor
1kΩ Resistor
470Ω Resistor
100Ω Resistor
27pF Capacitor
68pF Capacitor
100pF Capacitor
150pF Capacitor
0.1uF Capacitor
2.2uF Capacitor
Push Button
2x 2.2uH Inductor Choke
10uH Inductor Choke
1N4148 Diode
+9v Battery Connector
Ferric Chloride
Clothing Iron
Solder
Soldering Iron

 

[JimB]

OK, and is there a schematic for this lot?

JimB

 

[bhuvaneshnick]

ya i have today i think i start doing myself,then i ping thank you

 

[Willen]

Till now are you drawing shchematic?

 

[bloki]

Transmitter schematics: http://www.pyroelectro.com/projects/pyro_rf_transmitter_27mhz/schematic.html
Receiver schematics: http://www.pyroelectro.com/projects/pyro_rf_receiver_27mhz/schematic.html

Do not worry it will work on even larger distance than 3m if you assemble and tune it correctly.