any1 can guide me to FM trnsmitter Receiver for 1Km or more - Electronic Circuits Projects Diagrams Free

tkhalid · 6th January 2003, 04:49 AM

hi fellows.
is there any 1 who can guide me abt designing an FM Transmitter and Receiver for 1 km or More Range. or is there any IC which can prform the same task.
1 thing necessary to mention is that i cant desighn the project as not in professional field. so plz treat me as a student.
thanks to all of u.

**kinjalgp** · 6th January 2003, 05:34 AM

The FM transmitter given in our Projects Section can be modified to increase the range. In the output power stage befor antenna you can use a power transistor like BD139 to increase the transmission power.
WARNING: Transmitting any type of data over radio frequency band for more than 100 meters is illegal without license from FCC. So be careful before any experimentation.

elegeek · 7th January 2003, 09:29 AM

hi
u can get ready made fm transmitter boards for as cheap as rs 25
in india,u in pakistan convert it into its equivalent.for transmitting over
1 km u don't need to worry abt the reciever.only the current supplied to the transmitter unit is to be bothered abt.for 1 km dist 5 volts should suffice ,if the there is a direct line of transmission (straight line or else) u need to design circuits and enter into rf communication.
hope this is of any use to u.
bye

**mechie** · 7th January 2003, 01:34 PM

Take a sken at this ...
http://www.hobbytron.net/R-FM25.html

**kinjalgp** · 7th January 2003, 04:31 PM

Quote:

if the there is a direct line of transmission (straight line or else) u need to design circuits and enter into rf communication.
hope this is of any use to u.

RF waves are omni directional waves. The spread in all directions and not only in one direction as mentioned by elgeek.

herbymcduff · 8th January 2003, 06:25 PM

True that RF is omni directional, but you can control the direction with different types of antennas. Like a four element collinear array, or a six element Yagi. Those two produce a pretty staight line. It makes you wonder how they get Space wave or Direct wave propagation.

elegeek · 9th January 2003, 12:30 PM

hi
by direct line of communication i meant no obstruction in th epath of rf waves.if there are buildings (as an eg) for the the ready made ckt i was talking abt u can't transmit it for over a km.moreever the transmission frequency must not interere with the exsisting fm transmission by the
govt organ: fm radio.there are stringent laws used by every govt which restricts the use of rf for communication purposes.u can transmit in the citizens band.u don't need to worry abt antennas for hobby proj:.just a simple wire would do,even a bread board wire with an open end .
if it is for a serious application which u intend commercilaising then u need to get license and lot other headaches which i am not aware of.

Mikkel · 10th January 2003, 05:02 PM

http://w1.859.telia.com/~u85920178/tx/bug5.htm

Simple and ove 1Km range

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6th January 2003, 04:49 AM	(permalink)
tkhalid	any1 can guide me to FM trnsmitter Receiver for 1Km or more hi fellows. is there any 1 who can guide me abt designing an FM Transmitter and Receiver for 1 km or More Range. or is there any IC which can prform the same task. 1 thing necessary to mention is that i cant desighn the project as not in professional field. so plz treat me as a student. thanks to all of u.

6th January 2003, 05:34 AM	(permalink)
kinjalgp	The FM transmitter given in our Projects Section can be modified to increase the range. In the output power stage befor antenna you can use a power transistor like BD139 to increase the transmission power. WARNING: Transmitting any type of data over radio frequency band for more than 100 meters is illegal without license from FCC. So be careful before any experimentation. __________________ "There is no way to peace, peace is the way!"

7th January 2003, 09:29 AM	(permalink)
elegeek	ready made boards available in the market hi u can get ready made fm transmitter boards for as cheap as rs 25 in india,u in pakistan convert it into its equivalent.for transmitting over 1 km u don't need to worry abt the reciever.only the current supplied to the transmitter unit is to be bothered abt.for 1 km dist 5 volts should suffice ,if the there is a direct line of transmission (straight line or else) u need to design circuits and enter into rf communication. hope this is of any use to u. bye

7th January 2003, 01:34 PM	(permalink)
mechie	FM transmitter kit Take a sken at this ... http://www.hobbytron.net/R-FM25.html __________________ I need a memory upgrade ... My head is full !

8th January 2003, 06:25 PM	(permalink)
herbymcduff	True that RF is omni directional, but you can control the direction with different types of antennas. Like a four element collinear array, or a six element Yagi. Those two produce a pretty staight line. It makes you wonder how they get Space wave or Direct wave propagation. __________________ \"If Noah had been truly wise, he would have swatted those two flies\" Joe Blaschka

9th January 2003, 12:30 PM	(permalink)
elegeek	hi by direct line of communication i meant no obstruction in th epath of rf waves.if there are buildings (as an eg) for the the ready made ckt i was talking abt u can't transmit it for over a km.moreever the transmission frequency must not interere with the exsisting fm transmission by the govt organ: fm radio.there are stringent laws used by every govt which restricts the use of rf for communication purposes.u can transmit in the citizens band.u don't need to worry abt antennas for hobby proj:.just a simple wire would do,even a bread board wire with an open end . if it is for a serious application which u intend commercilaising then u need to get license and lot other headaches which i am not aware of.

10th January 2003, 05:02 PM	(permalink)
Mikkel	http://w1.859.telia.com/~u85920178/tx/bug5.htm Simple and ove 1Km range