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transreciver

04/21/2008 7:36 AM

hi every one it is very urgent ......

- i want to make a project on transreciver with following infomation

- Range with in 500m

- bandwidth fm range (transreciver should work on fm range(88-120MHz))

- if posible with out any ic (using basic component which can be easily purchaded from market )

- i have basic idea of fm transmition and reception so ckt should not be so much complax

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Guru
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#1

Re: transreciver

04/21/2008 11:49 AM

Be advised that there is legal and licensing requirements in most countries.

Here is a simple design with discrete components:

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#3
In reply to #1

Re: transreciver

04/22/2008 7:55 AM

Quite. 88-108MHz is the VHF broadcasting band!

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#5
In reply to #3

Re: transreciver

04/22/2008 10:45 AM

Right

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#2

Re: transreciver

04/21/2008 9:14 PM

#1 thread metioned is only a AM transmitter.

However, I think the so much big bandwidth is a diffcult task for a FM trans.

500m is not problem. 0.5w can be done.(also depend on your high of antinna)

besides, which signal will yuou deal with? sound or descret data? concern different chips.

go to IT web site to find out most of these chip.

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#4
In reply to #2

Re: transreciver

04/22/2008 7:57 AM

sir

if you think that bandwidth is problem then what you suggest

but transreciever should work in fm range .

what will be hight of antenna if range of the transreciever is 500m and i want to emband it on the bread bord what will be its cost (cost of components)

please sent me a suitable ckt diagram

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#6
In reply to #4

Re: transreciver

04/22/2008 10:51 AM

For that small range, The antenna only needs to be 1/4 wavelength of your carrier frequency.

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#7
In reply to #4

Re: transreciver

04/22/2008 8:56 PM

Your equipment overlaid total broadcast band of fm. I hvnt heard so sumch wide band transmitter. the muxium band is about 125khz. of cause you can use up to 1mhz depend on your requirement. this is rather wide band in practice. but this will require antinna is total band range.

and middle frequency amplifier is also high quality. double couple method can do it.

distance denpend on not only higher of antinna but power. besides, distortion etc you have to take acount of.

What type of signal will you deal with? you hve relate to it.

analog or digital?

single or stereo?

if you use it for campus culture or data transmit?

you eem just to get in touch of the topic.

answer my above question, then you will know how to build up it....

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#8
In reply to #7

Re: transreciver

04/23/2008 5:41 AM

thanks for the advise

frist i am student of second year of my B.Tech i have basics idea of fm analog signal transmition so i am just studing these topic in my classes these days so have not so much experience in the field of system designing. i am just tring to impement ideas or can say just experementing what so ever im studing.

i want to make this project for the tech fest which is just going to held in coming next month .

my plan was to built a tunable transreciever so for the time being i thought that i have to drop this plan

i want to use analog signals

band width (which you think is suitale to transmite a voice signal over the range of 500m or more )

i going to use it for campous in my collage

i want to make two sets between which i want to use it for two way communication for distance almost 250-500m

please tell me a circuit(ckt)which should not be expensive and can be easily implemented

waiting for your responce

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#9
In reply to #8

Re: transreciver

04/24/2008 8:51 PM

In your case, the band wide will be only 10--25khz enough, you can choice carrier from the band you said above.

you can use a dielectric capacitor as modular. its cheap. and there is products in shop.

try to contact with your teacher and finish it. it needs patient.

test is very borthering.

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