fm broadcast station

ARRL Handbook would be a great place to start.

You can buy it at a host of different places, but check your college library. That would probably be your best resource for that book and dozens of others.

Be sure to observe all local and national laws that govern transmission of RF.

dear sir i do not want to buy but i want to embedd it myself. so sent me some schematic

manoj kumar,

Building a stable FM transmitter "from scratch" definitely requires more finesse than AM, based upon my personal experience from decades ago. (I am talking about the discrete component - early I.C. era)...

Things like hand tuning coils to "fine-tune" your output freq... And endlessly "tweaking" your analog PLL (Phase-Locked Loop) circuitry, to improve performance & stability.

While the ARRL handbook is an excellent place to start, as Anonymus Hero said, you might want to check out the web site of Ramsey electronics

(http://www.ramseyelectronics.com)

They sell various hobbyist kits as well as pre-assembled AM & FM transmitters, and many other types of electronic equipment.

You could purchase a kit that would suit your needs for well under a hundred dollars (US)...

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Just my $0.02...

2-3km may need 5w power at leat.

do your athorities agree you set up such station freely?

no any constrains? or you will be punished by them if no certificate.

mono or stereo fm do you want to setup?

I regularly transmit over 30Km on 5 Watts of power, there are so many variables that effect proporgation distance to be so specific including height, surrounding area, antenna gain etc...

you are right, it depends on frequency as well besisdes your said above.

if you use super short wave, this power can transport through the wide world by reflect of F layer.

are you a harmmer? although harm station is using am. or a fox searcher?

I am a G7 Amateur radio licensee in the UK and I've been mainly operational on 144-146Mhz (2M) not far from the FM Broadcast band, I have played with HF equipment down to 3Mhz and as you say the possibilties are great in comparison, I did built a kit form FM Transmitter using 2x 2N3566's but it was very basic and I had problems with stability, I used a standard 3 element Yagi FM antenna and acheived a range of about 4 miles across town.

This maybe useful for Manoj Kumar:

http://members.tripod.com/~transmitters/links.htm

The most important question is: How much money do you have to start this station?

What do you want the station to do? How long will you be broadcasting? Do you want to sell advertising? How many hours will you be broadcasting? How many people are willing to actively support the station?

There are a variety of solutions out there. But these questions should be answered first.

In the US, without a license from the FCC, you may not broadcast more than I believe 1/2w of power. I do not know the licensing requirements in your locality, but I would be surprised if India did not have some similar regulations. Building a 5W transmitter, while not exactly child's play, is also not out of the realm of possibility either. However In the US, you have to have an "Expert" Amateur radio license or a commecial radio engineer license in order to legally operate a homebrew transmitter with that power level. Additionally, you may find that it will actually be cheaper to buy an off-the-shelf unit than it would be to build one from scratch. You may have other motivations for building it from scratch such as a learning tool for radio technicians etc. but you'll need to justify spending the extra money somehow.

to have an "Expert" Amateur radio license

Did you mean amateur "extra"? There is no such classification as amateur "expert" in the US.

I might make sense to buy a transceiver though, rather than build one if he wants to get on the air soon. Perhaps build a kit. That is another option.

excuse me, you're right, I did mean Extra. mea culpa.

I know cuz I is 1

Another thing to consider, you will need a transmitter that is designed for continuous duty.

Hello, like Jman said Ramsey Electronics has complete transmitters both AM and FM and in kit forms from small up to commercial. Also, you could start small and add power amp if the lower power did not cover the area. They have antennas and most any other items you would need.

Is this going to be live or taped broadcast? You will probably need a mixer board for mike input and also for tape, cd, or any other source.

I have used there FM25B unit in a Drive In theater here in the USA. I found the audio out to the speaker system and taped off to the unit so the cars could receive on the radios because there were more parking spots than working windows speakers.

Just using a 1/4 wave antenna Inside the projector room about 1.5m off the ground and with the unit in low power mode the range was 1/4 to 1/2 mile .4 to.8 Km. This was I think 100mW level.

Anyway give them a look, most items can be got in kit form, if you want to learn how it works and to put it together and save a little money. Or buy assembled and tested for a little more.

Also, make sure to look in pro-audio for the rest of what you need to set up a station.

metalSmith's

disclaimer: I'm not affiliated with Ramsey, Just a consumer, and I have built several of there kits over the years. The manuals are good, the boards are good and the parts come with it. So no sourcing for parts. The cases are optional on some kits. Unless you're building a turnkey system I'd get the matching cases.

thanks

yes it will be be a tapped broadcasting. we want to broadcast the guest lecture in our campus to all those student who can not attend the lecture.

we need your kind guidance to complete this project. we want help the student community in our collage. and we want to embed it of our own so that student can get good knowledges about the FM broadcasting

hoping for the best***************

Hello, After reading some of the new posts. I think Buying a kit would be the best compromise between designing from scratch with the problems in doing design and board layout. Verse buying a complete built and tested unit. The reason being working with R.F. and trying to make a noise free and stable circuit can be difficult. With the Kit the board and components have been through the design and stabilize to produce a good product.

Also with the kit the manual walks you through the components and theory and troubleshooting and if needed tech support. And it discuss the proper ways to solder the components. Here a link to the Ramsey Electronics Kit FM25B

the only thing the online manual does not have is the schematics.

To interface the Tape system to the F.M. unit all you would need is a simple cable from the line out on the tape unit to the input. If your tape unit does not have line out you can use the headphone jack you would just half to be careful not to over drive with the volume out of the headphone jack. Otherwise it would be distorted very badly.

Like I had said and audio mixer with several inputs one for a mike,tape unit 1, tape unit2, C.D.unit, or what ever else and the mixer has audio out for a monitor speaker/headphone jack so you can hear what going in and coming out. Very useful feature to have. Other wise you would need a radio to hear and adj on air Which is not good. Although it would be good practice to monitor with a radio just make sure the system is working correctly.

Also someone else mention duty cycle this unit will work contentious with out any problem.

Hope this helps you some

metalSmith's

Dear friend,

I Have experience in to build FM transmitters. Different powers and diferent antennas. If you find some solution is OK, but if you like I can provide you information.