I built an FM radio transmitter (if you need the schematic I will scan it) and every once in the while use to broadcast some music. The problem is it only broadcasts within a very (I mean very!) short distance. How could I increase the distance?
I am pretty sure it is not the power, it is connected to a 3 foot wire, that is how it works.
HERE IS THE SCHEMATIC:
http://img201.imageshack.us/img201/9977/schematicgs1.jpg
1. Use a directional antenna to increase the output signal in the desired direction.
2. Adjust the impedance of your antenna. The circuit you describe does not include an output impedance adjustment, so you have to use/make an antenna that matches this circuit. If you have the antenna connected directly to the output, and the length of the antennae is 1/4 the wavelength of the frequency that you are transmitting at, you should get maximum signal transmission.
3. Get an RF amp. (But remember, the FCC limits the broadcast power you can legally transmit without a license.)
I have a farm in mountains and there is no any communication. I would like to establishe a FM radio there. Two small station with 2KM radius. and two FM radio for receiving the waves. How can i build it? Any idea?
If you are just listening to music, it would be a lot easier to get a boom box. If you want 2-way communications, a CB can be gotten at Radio Shack.
If you want to establish a radio station, low power FM is the way to go. It costs about $250 k to set up the station and about $100 k per year to operate it.
20 Years Of RMF FM Radio
27.02.2010
Alexandra Burke – Bad Boys
(C) RMF FM & Polsat
Duration : 0:3:18
Read the rest of this entry »
If there is please give me the name of the app thanks! If there isn’t an app is there any way to listen to local FM Radio on my Ipod touch without WIFI.
Yeah, Wunder Radio should work for you!
I want to buy a new phone but i don’t want those fancy high tech phones all i want is with 3G and fm radio capabilities
I phone is sick, no regrets!
All mobiles phone who has facility to tune to FM Radio ask for insert the earphone to start the Radio. Once you insert the earphone or headphone then you can put it in Loudspeaker mode, but as soon as you take out the pin out of phone it will stop the Radio? Why so?
the ear phone wire has a small box on it if u notice….it contains frequency receiver u may relate it to traditional antennas in radio sets
thats the reason u need to attach it
if it were inside the mobile handset it would provide as much clarity in reception of the voice signals
xD
cute cute!!!~
Duration : 0:3:51
Read the rest of this entry »
I’m doing a project on radio, and i wanted to find the transmission ranges of AM and FM radio, or the distance at which their respective signals are still useful.
Welcome to the magic of "propagation".
SHORT answers:
FM radio signals are normally limited to a maximum of about 50–100 miles in crowded radio markets, and about half again farther in areas where interference from other stations wouldn’t be a problem. The FCC sees to that in order to avoid interference issues that would degrade reception.
AM radio signals can cross the country, and in fact, a very few are encouraged to try to do just that at night with their high transmitter power, antenna design and frequency allocation.
LONGER ANSWERS:
Especially for AM, there’s no *easy* answer to this question since so MANY variables come into play. While AM and FM broadcast signals propagate quite differently (due to the difference in their frequencies) and their distances are affected by the following to varying degrees, here’s an interesting list:
For AM especially, what is the time of day? Makes a HUGE difference due to what is known as skip (see link below). AM can make it cross-country at night if there isn’t too much …
… interference. This can come from other stations on the same frequency or from artificial sources. Certain AM frequencies were once (and still are to some degree) called "clear channel" since a limited number were allowed to operate on the same frequency and with high power at night.
Power makes a big difference. A 250 watt transmitter and a 50,000 watt transmitter will certainly have different coverage areas. See "Time of Day", above. Because AM stations can have such greater coverage at night, those on many "regional" and "local" frequencies are required to lower their transmitter power at night (the FCC sees to that) to keep their range in check to avoid interference with other stations. A station might be 10,000W during the day, and only 500W at night.
Antenna design — antennas can be directional by nature, and squeeze more of their power into certain directions. That’s called "antenna gain". If you were on the west coast and didn’t care about the folks in the Pacific Ocean, why not try to direct all of your energy in an easterly direction? It’ll go a whole lot farther if it doesn’t have to try to cover a 360 degree circle.
Antenna height — especially for FM, which tends to be a more or less "line of sight" proposition in the first place. Get the signal up there, and you can get an FM signal to reach out a good bit more.
Sunspots — yeah, sunspots. Every 11 years, the sun goes on a tirade, and it does some very interesting things to the upper atmosphere. That "something" also makes a big difference to radio wave propagation.
The list of variables IS huge, and there’s just no one answer to your question as a result. Engineers spend a lot of time estimating (and then measuring) the propagation of a broadcast TV, FM or AM station… and are often still surprised at the results.
Here’s a couple of links that discuss this in more detail:
http://en.wikipedia.org/wiki/Radio_propagation_model
http://en.wikipedia.org/wiki/Radio_propagation
Some people make a hobby of trying to pick up distant AM (medium wave) stations, and a few try for long distance FM or TV. It’s called DXing (DX being the abbreviation for "distance". A couple more sites out of hundreds of possible ones devoted to this hobby:
http://en.wikipedia.org/wiki/MW_DX
http://en.wikipedia.org/wiki/E-skip
I just wanted to find out how a independent fm radio station is setup and what are the costs . There is some website which charges 80 pounds to answer the same question . Basically I have no knowledge of this at all whatsoever and just wanted to know how is a fm radio station setup what are the costs, licenses etc?
Regards
Sam.
For costs of an on-line station go here,
http://www.ehow.com/how_2040362_start-on..
www.ehow.com/how_4912525_set-up-local-radio-station.html
* Have a Good Day *
~ Don ~
im doing a paper on Radio Broadcasting and i need some information about how you go about obtaining a FM radio license.
im not looking to get one myself, i just need some sites that would give me the information i need to write my report. just kinda stuff like what qualifications need to be met and what the process is and so on
any help would be great, thanks!
Legal and Engineering Assistance in the Preparation of Construction Permit Applications for Licensed Stations. Most applicants retain legal counsel and broadcast engineering consultants to perform frequency searches and help prepare the legal and technical portions of construction permit applications. The FCC does not maintain a list of or recommend any particular legal services or broadcast engineering consultants, but we note that many of these services do advertise on the Internet and in trade publications. You must decide which services best suit your needs. Please be aware that the FCC cannot tell you whether a frequency will be available in a particular location, or help in the preparation of applications (except for questions of a general nature).
Access to a Computer is Essential. The Commission is rapidly implementing electronic filing of its applications and the elimination of paper forms. This procedure has several advantages, including error checking of application entries before an application is accepted for filing, more rapid posting of data, and reduced processing time. Construction permit applications, for example, must now be electronically filed; paper-filed applications will not be accepted for filing.
Application Filing Fees. For commercial AM, FM, and TV broadcast station applications, filing fees must be paid with the submission of any application. These fees are detailed in the Media Bureau Fee Filing Guide, which may be retrieved through the Internet at http://www.fcc.gov/fcc-bin/audio/appfees.html.
FCC Application Forms. FCC application forms may be retrieved through the Internet at http://www.fcc.gov/formpage.html, or by writing to:
Federal Communications Commission
Forms Distribution Center
2803 52nd Avenue
Hyattsville, MD 20817
and requesting the appropriate form (e.g., FCC Form 340). Broadcast application forms available for electronic filing may be retrieved through http://www.fcc.gov/mb/elecfile.html. Please be aware that the availability of paper vesions of the form at these locations does not override the requirement for electronic filing of most applications.
FCC Rules. Any FCC rule may be retrieved at the Code of Federal Regulations site at http://www.gpoaccess.gov/cfr/index.html. Parts 70 to 79 of the Code of Federal Regulations, which contains the radio and television broadcast station rules in Part 73 and the FM and TV translator rules in Part 74, may also be obtained in book form from the Government Printing Office, 866-512-1800.
For your convenience, we have compiled the radio broadcast station rules on the Internet at http://www.fcc.gov/fcc-bin/audio/amfmrule.html. FM translator station rules may be retrieved at http://www.fcc.gov/fcc-bin/audio/part74rule.html. These rule lists are updated once a year, after the Code of Federal Regulations website is updated to reflect rule changes from the previous year.
Mutually Exclusive Commercial Auctions. Where conflicts occur between mutually exclusive commercial applicants (that is to say, where interference would be created between applicants if all applications were to be granted), the conflict will be resolved by means of an auction. The auction process was mandated by Congress and the President in the Balanced Budget Act of 1997.
Information about the auction process is available on the Internet at http://wireless.fcc.gov/auctions/ (see also the general information about auctions). Please note that we cannot provide advance information as to when an auction or application filing window for a particular service might be opened. However, notice of an auction proceeding or an application filing window period will be posted in the Headlines at the Media Bureau website.
Mutually Exclusive Noncommercial Educational Applications. Noncommercial educational station conflicts with other timely filed noncommercial educational applicants (i.e., where interference would be created between stations if all applications were to be granted) will be resolved through a point system. The point system is described in the Report and Order in MM Docket 95-31, FCC 00-120, released April 21, 2000 [ PDF | Word | txt ]. See also the Memorandum Opinion and Order, MM Docket 95-31, FCC 01-64, released February 28, 2001 [ PDF | Word | txt ], [ Appendix D (PDF); Appendix D (Word) ]. See also Sections 73.7000 through 73.7005.
FM Commercial Stations
FM commercial stations may be authorized on 92.1 MHz to 107.9 MHz, corresponding to Channels 221 through 300. Noncommercial educational FM stations may also be authorized in this band but such applications must meet the spacing, city coverage, and other technical criteria applicable to commercial stations.
Rules. FM commercial station rules include 47 CFR 73.201 through 73.333, and 73.1001 through 73.7005. These rules may be retrieved at http://www.fcc.gov/fcc-bin/audio/amfmrule.html or obtained from the Government Printing Office at the location listed in the Introduction above. New rules in effect as of January 19, 2007 prescribe new procedures for the filing of petitions for rulemaking and applications for new commercial FM stations (see the Report and Order in MB Docket 05-210, FCC 06-163, 21 FCC Rcd 14212 (2006), 71 FR 76208 (December 20, 2006) [ PDF | Word ]). An applicant/petitioner seeking to apply for a new allotment must:
Electronically file FCC Form 301, application for construction permit, for specific allotment proposed by the petitioner. This application must be complete and acceptable. The applicant must pay the rulemaking fee as well as the application filing fee listed in the Media Bureau Fee Filing Guide and include FCC Form 159 with the fee payment and application. Please note that payments for commercial applications must be directed to the Pittsburgh, PA address listed in the Media Bureau Fee Filing Guide, and NOT the FCC in Washington, DC.
On the same day as the Form 301 is filed, file a petition for rulemaking on letter-sized paper (an original and two copies) through the Office of the Secretary, FCC. The petition must include the proposed new channel, class, and the community to be served. The proposed new allotment must meet the spacing requirements of Section 73.207 of the Commission’s rules to other stations, prior-filed applications, and vacant allotments, and provide at least a 70 dBu signal strength over the entire community of license.
The petition and application must cross-reference each other, so that we can associate the two related filings.
We will then consider the merits of the petition for rulemaking. If the petition for rulemaking is technically acceptable, the Bureau will release a Notice of Proposed Rulemaking which will indicate the date by which interested parties may file comments or counterproposals. If approved, an FM allotment will be created and placed in a future FM broadcast auction proceeding. The petitioner/applicant must, at a minimum, qualify to bid in the auction. If the applicant is the successful bidder for the allotment, the previously filed Form 301 construction permit application will become the applicant’s post-auction long-form construction permit application.
Petitions for rulemaking for new allotments should be directed (in triplicate) to the attention of the Audio Division (MB), c/o Office of the Secretary, TW B204, FCC, 445 12th Street NW, Washington, DC 20554.
Auctions. Once auction filing window dates are announced for allotments which were created previously, instructions for filing applications will be released on a Public Notice, which will also be placed on the FCC’s Internet site at http://www.fcc.gov/mb/audio/. We cannot provide advance information as to when the next auction or application filing window might take place. (General information about auctions.)
Additional Information about FM broadcast stations and applications may be accessed on the Internet at http://www.fcc.gov/mb/audio/main/fm.html.