Calculate map scale given equivalent map and ground distances
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When 1 millimeter on the map is equivalent to 1 kilometer on the ground, the map scale is 1:100000.
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Calculate map distance given map scale and ground distance
At a map scale of 1:100000, 1 kilometer on the ground is equivalent to 1 millimeter on the map.
Calculate ground distance given map scale and map distance
At a map scale of 1:100000, 1 millimeter on the map is equivalent to 1 kilometer on the ground.
Get a custom map ruler for any map scale you need.
1. These maps are cool, how are they drawn?
These maps are drawn using engineering data from the FCC. Thecoverage pattern for each FM station is calculated using the effectiveradiated power (ERP) of the station and the antenna height aboveaverage terrain (HAAT). The HAAT is calculated in all directionsbased upon the average ground elevation between 1.5 and 10 miles fromthe station in each direction.
The coverage pattern for each AMstation is based on the station's transmitter power, it's field strength pattern,the frequency of the station, and the ground conductivity of thelocal area.
2. What do the red, purple, and blue lines mean?
The red, purple, and blue lines correspond to the 'local', 'distant', and'fringe' predicted coverage areas of each radio station:
- Local Coverage: Within this area,you should be able to receive the radio station on almost any radiowith moderately good to very good reception.
- Distant Coverage: Within thisarea, the signal of the radio station may be weak unless you have agood car radio or a good stereo with a good antenna. You may not be able to receive thestation at all on inexpensive radios or radios with poor antennas.
- Fringe Coverage: Within this area, thestation's signal will be very weak. You may be able to receive thisstation if you have a very good radio with a good antenna, but it'spossible that interference from other stations may prevent you frompicking up these stations at all.
3. What criteria do you use to define the'local', 'distant' and 'fringe' coverage areas?
The 'local', 'distant' and 'fringe' lines on the FM maps correspond tothe predicted 60, 50, and 40 dBμ signal strength contours respectively.
The 'local', 'distant' and 'fringe' lines on the AM maps corresponds to thepredicted 2.0, 0.5, and 0.15 mV/m contours respectively (of thegroundwave propogation signal).
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4. Why do the AM patterns look so funny?
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There are two factors that might give an AM station an odd lookingcoverage area: directional antenna patterns and ground conductivity.
- AM Antenna Patterns: AM radio stations with one towertransmit their signal with equal strength in all directions. Thesestations have a circular, or 'non-directional' antenna pattern. AMstations that have more than one tower can precisely tune theirantenna patterns to a very specific shape. The number of towers, thespacing and orientation of each tower, and the phase and ratio of thesignal that is sent to each tower all combine to create an antennapattern that might look heart-shaped (cardioid), peanut-shaped, orshaped like a 3, 4, or multi-leaf clover.WOBL-AM in Oberlin, Ohio,for example, has 4 towers and a daytime antenna pattern that looks a little likeCasperthe friendly ghost!
- Ground Conductivity To a large degree, AM radio signalsare affected by the electricalconductivity of the ground over which they travel. Higher groundconductivity will enable AM radio signals to travel farther.The geology of the United States varies greatly from onearea to another, and this affects the conductivity of the earth. Seawater has a much higher conductivity than the ground, so AMradio signals will always travel much farther over sea water than over land.WCBS-AM in NewYork City, for example, has one tower and a circular antenna pattern,but as youcan see, its signal travels much farther over the water. You canlearn more about ground conductivity at the FCC's website.
5. Why do the FM patterns look so funny?
FM radio stations can also have directional antenna patterns, althoughthe effect of FM directional antennas is less pronounced than that ofAM antenna patterns. FM radio waves,however, are called 'line of sight', which means that they do nottravel well through solid objects, such as mountains or hills.KBCO-FM inBoulder, Colorado, for example, has relatively flat land to the east,but mountains to the west. This means that it cantransmit muchfarther to the east than to the west.
6. How accurate are these maps?
These maps are generated using the same data and most of the samealgorithms that the FCC uses when trying to predict coverage of radiostations and interference with other nearby radio stations.
However, there are many factors that contribute to radio reception.One of the biggest factors is your radio; some radios will performmuch better than others in trying to pick up distant radio stations.Other factors include interference from radio signals bouncing offnearby buildings (multipath interference), interference from otherstations on nearby frequencies, or interference from nearby electricalequipment in your area. Murus pro suite 1 4 22 review.
Very mountainous terrain, or very non-typical geology can also affectradio signals. If you're on a mountain, you may be able to pick upradio signals much farther than indicated on our maps. Likewise, ifyou're in a valley, you may have trouble receiving many stations.
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At night, AM signals can bounce off the ionosphere and travel greatdistances. This means that at night you may be able to pick up an AMstation from hundreds of miles away. It also means that at night, AMstations that are hundreds of miles away might interfere with stationscloser to your area.
We hope that you enjoy using these maps, but we also hope youunderstand that they are 'predictions' based upon the information thatwe have available to us, and that your actual reception of thesestations may vary considerably.
7. I like the map of my station! Can I put it on my website?
We charge a modest licensing fee for commercial use of our coveragemaps. Please note that we can tailor the map images to meet your specific needs by alteringthe size, color, or other characteristics of the maps. If you're interested inusing one of our maps, please contact our sales department at: .
Faux pas 1 6 1. If your question was not answered here, please write to: .
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