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Long range (wireless)signal communication - RF Cafe Forums
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vihangas
Post subject: vihangas
Post subject: Long range (wireless)signal
communication Posted: Sun Dec 03, 2006 11:13 am
Lieutenant
Joined: Sun Dec 03, 2006 10:53 am
Posts: 2
Hi Guys,
I
am new to this RF design and stuff..
Can anybody help out how to
design a circuit for transfering a signal for a 1KM. I want to design
product should be as small as it can be hold in palm like car secuity
system. I dont want to transfer any kind of audio signal. It cud be
some binary data. I have restrictions on cost of the product, It should
not cross 15-20$.
Please guide me in designing this system.
vihang
vihangas@rediffmail.com
Top
fred47
Post subject: RF designPosted: Tue Dec 05, 2006 12:52 am
General
Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
Hi Vihangas,
In order to design something, you need a clear understanding of
1. what you're trying to do
2. what the restrictions are
In
the first category, are you talking about 1 bit/second? 1k bits/second?
100k bits/second? 10M bits/second? What quantity of these (remote controls?)
are you trying to build? - there's often a wide range in component prices,
depending on quantity. Who is your market (consumer? law enforcement?
military? terrorists?)
In the second category, what country are
you in? (The laws of different countries vary dramatically, as far as
power, frequencies, bandwidth, duty cycle, etc., are concerned).
"If you don't care where you're going, any solution is fine..."
Good Luck,
Fred
Top
vihangas
Post subject:
requirmentsPosted: Tue Dec 05, 2006 2:47 pm
Lieutenant
Joined: Sun Dec 03, 2006 10:53 am
Posts: 2
Hey Fred,
Thanks
for your reply. well I will not able to tell what could be bits/sec.
let me explain me in more details, see if you can only suggest me.
I stay in India. I am developing this wireless transceiver for the farmers
(filed is agricultural). I want to operate a relay on receiver side
which will on-off upon the signal send by transmitter. So that need
not be the data. but the same time one transmitter should be unique
for one receiver. Here I want both transmitter and receiver on battery.
I expect receiver should send acknowledgement on receiving signal from
transmitter and on successful action on it. What I can imagine about
acknowledgment is there would be two frequencies one for positive response
and one for negative response.
Why I am bit press for the cost is
the cause where it going to use. Here farmer can not afford such product
for more than 15-20$.
Now I request you only to give me the direction
to move ahead.
Regards,
vihang
Top
fred47
Post subject: Remote controlPosted: Fri Dec 08, 2006 2:00 am
General
Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
Hi!
OK, so what we have is a transceiver with undefined (but
low!) power, transmitting on an undefined (but high?) frequency, operating
from an undefined (but inexpensive!) power source with an undefined
life, of undefined reliability, of small physical size, communicating
with a second transceiver of similarly undefined characteristics, which
will control a relay to control an undefined load.
The first
step in designing something is to be absolutely crystal clear on what
you want - in other words, define what you mean by "success". You don't
even have to be clear with anyone else - if it's you doing the design.
But you do need a vision of the goal. Otherwise, who you need is Harry
Potter, not an engineer.
Good Luck!
(I'm not being sarcastic
- just a bit frustrated !)
Fred Posted: Sun Dec 03, 2006 11:13
am
Lieutenant
Joined: Sun Dec 03, 2006 10:53 am
Posts:
2
Hi Guys,
I am new to this RF design and stuff..
Can anybody
help out how to design a circuit for transfering a signal for a 1KM.
I want to design product should be as small as it can be hold in palm
like car secuity system. I dont want to transfer any kind of audio signal.
It cud be some binary data. I have restrictions on cost of the product,
It should not cross 15-20$.
Please guide me in designing this system.
vihang
vihangas@rediffmail.com
Top
fred47
Post subject: RF designPosted: Tue Dec 05, 2006 12:52 am
General
Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
Hi Vihangas,
In order to design something, you need a clear understanding of
1. what you're trying to do
2. what the restrictions are
In
the first category, are you talking about 1 bit/second? 1k bits/second?
100k bits/second? 10M bits/second? What quantity of these (remote controls?)
are you trying to build? - there's often a wide range in component prices,
depending on quantity. Who is your market (consumer? law enforcement?
military? terrorists?)
In the second category, what country are
you in? (The laws of different countries vary dramatically, as far as
power, frequencies, bandwidth, duty cycle, etc., are concerned).
"If you don't care where you're going, any solution is fine..."
Good Luck,
Fred
Top
vihangas
Post subject:
requirmentsPosted: Tue Dec 05, 2006 2:47 pm
Lieutenant
Joined: Sun Dec 03, 2006 10:53 am
Posts: 2
Hey Fred,
Thanks
for your reply. well I will not able to tell what could be bits/sec.
let me explain me in more details, see if you can only suggest me.
I stay in India. I am developing this wireless transceiver for the farmers
(filed is agricultural). I want to operate a relay on receiver side
which will on-off upon the signal send by transmitter. So that need
not be the data. but the same time one transmitter should be unique
for one receiver. Here I want both transmitter and receiver on battery.
I expect receiver should send acknowledgement on receiving signal from
transmitter and on successful action on it. What I can imagine about
acknowledgment is there would be two frequencies one for positive response
and one for negative response.
Why I am bit press for the cost is
the cause where it going to use. Here farmer can not afford such product
for more than 15-20$.
Now I request you only to give me the direction
to move ahead.
Regards,
vihang
Top
fred47
Post subject: Remote controlPosted: Fri Dec 08, 2006 2:00 am
General
Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
Hi!
OK, so what we have is a transceiver with undefined (but
low!) power, transmitting on an undefined (but high?) frequency, operating
from an undefined (but inexpensive!) power source with an undefined
life, of undefined reliability, of small physical size, communicating
with a second transceiver of similarly undefined characteristics, which
will control a relay to control an undefined load.
The first
step in designing something is to be absolutely crystal clear on what
you want - in other words, define what you mean by "success". You don't
even have to be clear with anyone else - if it's you doing the design.
But you do need a vision of the goal. Otherwise, who you need is Harry
Potter, not an engineer.
Good Luck!
(I'm not being sarcastic
- just a bit frustrated !)
Fred
Posted 11/12/2012
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