asomo2000 said:
dear sir,i'm currently searching how to make a campus radio and i found your forum it is very interesting.sir. i would like to ask how to make step by ste to make a campus radio my radius is about 25 Km my power out is 10 watts. is this possible or i need to increase the power output..thank you very much hope to help me....
If you are on FM, you can increase the range by raising the antenna or by adding more antenna bays (to concentrate the RF energy in a narrower beam with less of the signal being wastefully radiated upward). If you are on AM, there are several options.The Low Power AM Broadcaster's Handbook (online at
www.diymedia.net/stuff/lpamhandbook.pdf ) contains a wealth of information about AM transmission systems of the kinds frequently used for campus radio stations.Using a combination of Part 15 AM free-radiating transmitters and Part 15 AM Carrier Current systems (both commonly used for campus radio stations), you can cover many square kilometers. Panaxis Productions
www.panaxis.com/broadbks.html has two books that are valuable resources for starting campus radio stations: "Carrier Current Techniques" and "Low Power Broadcasting." Free-radiating and Carrier Current systems are *both* covered in each book, with different emphases in each book--they complement each other quite well. They cover topics such as setting up a hybrid Carrier Current/free-radiate "grid" broadcast coverage area, equalizing telephone lines for delivering high-quality audio to the transmitters, "leaky cable" transmission systems, and much more.Another consideration (not covered in the books) is that you can broadcast in C-QUAM AM Stereo. Chris Cuff, who produces the "Alfredo Lite" and "Micro Lite" low-power C-QUAM AM Stereo transmitters, has used them (with linear amplifiers) for Part 15 AM Carrier Current broadcasting with excellent results.Also, here are additional web site links to suppliers of Part 15 AM free-radiating and Part 15 AM Carrier Current equipment, which is often used for Campus radio stations:Radio Systems
www.radiosystems.com (Carrier Current and free-radiating AM transmitters)LPB Inc.
www.lpbinc.com (Carrier Current AM transmitters)Hamilton PCB
www.am1000rangemaster.com (Rangemaster free-radiating transmitter--they can be synchronized to cover a larger area with multiple transmitters)Talking House
www.talkinghouse.com ,
www.actradio.com,
www.theradiosource.com/products-infomax.htm (Good, low-cost realty transmitter that works well for Part 15 broadcasting; outdoor ATU/antenna also available for it)TalkingSign
www.talkingsign.com (Good, low-cost realty transmitter that works well for Part 15 broadcasting; outdoor ATU/antenna also available for it)The Talking House TH II transmitters (the black, metal-cased units) are constantly available on eBay at low cost. Your campus radio station need not cover a huge area all at once. Think of it as grass planted in a pasture, with the roots spreading over time until the whole pasture is green. You could start with just one or two transmitters and add more over time as finances permit, literally building up a "grassroots" radio station whose coverage area continually grows.I hope this information will be helpful. -- Jason
