Group DescriptionThis group is for the worldwide discussion and posting of your FM and TV Dxing screen caps, videos, or equipment (antennas, tuners, receivers etc). 1x, 2x, 3x+ E-Skip, Trop, Meteor Scatter, Auroral scatter, TEP, EME, in analog or HD- it's all welcome.
Have you ever received a radio or TV station from outside of your area and wondered how it got to you? DXing is the hobby in which people listen for distant radio and television stations during certain atmospheric conditions. Hearing FM and TV stations from Houston in New York, Miami in Chicago, or Denver in LA? It can happen!
Three of the most common forms of DX are E-Skip, Trop, and Meteor Scatter. Normally when a signal is transmitted it is line of sight traveling out into space at the horizon. During "DX" however this signal is brought far beyond the horizon via one of several modes of propagation.
E-Skip occurs when a signal hits an ionized patch in the E-layer of the atmosphere acting as a reflective surface. Upon hitting this "Cloud" of ionization a signal is then reflected back to earth hundreds or even over a thousand miles away. In rare cases another "cloud" is in the area allowing a second or even third "hop" for even longer distances. (2x, 3x). Signals are usually characterized by strong but rapid deep fades. Frequencies affected depend on the "MUF" or Maximum Usable Frequency". As ionization intensifies so does the frequency at which that "cloud" will reflect. You will notice E-Skip on Channel 2 (54MHz) long before you see it in FM (88 MHz and above) as E-skip ionization affects the lower frequencies first. Many times you will see E-skip reach frequencies as high as the VHF TV band 54-88 MHz and occasionally into the FM broadcast band (88-108 MHz). One rare occasion the "MUF" will reach as high as the 2 meter Ham Radio band or even the Weather Band and High VHF (Channel 7-13). “Peak” E-Skip season occurs in the summertime from May-August during the morning or afternoon hours, with a smaller second peak in December. However, aside from these “peaks” E-Skip can be observed at any time during the year at any hour.
Trop forms when there is a temperature inversion in the atmosphere. Normally when a signals transmitted it is line of sight to the horizon. In trop however, this signal ducts in the temperature inversion allowing it to travel hundreds of miles beyond the horizon (and sometimes more). Trop/Tropo signals are usually characterized by steady signals of varying intensity. The best chance for hearing something on "Trop" is during the morning and evening hours during the Spring, Summer, and Fall, though it can occur at any time during any part of the year. There is no known pattern to the frequencies affected- If you have trop on Channel 2, you will also have it on the FM band on up to Channel 69 and beyond.
Meteor scatter forms when an meteor burns up in the atmosphere leaving a short-lived trail of ionization. Along this trail of ionization signals reflect in much the same way E-Skip signals do. Meteor Scatter however or "ms" for short is very short lived sometimes only lasting from a fraction of a second up to a few minutes. Ms can be heard on the FM broadcast band daily and even on TV.
In any of the above interests you please join our group! Additinally, feel free to also check out the WTFDA forums located at www.wtfda.info for audio clips, captures, DX alerts, or just plain discussion of DX related topics. Though not required to post there please consider joining the WTFDA at www.wtfda.org as well.
(Worldwide TV and FM DX Association)- It's an active DXing club which I have been a member of for 8 years.
- This group will count toward the photo's limit (60 for Pro members, 30 for free members)
- Accepted content types: Photos, Videos, Images, Art, Screenshots
- Accepted safety levels: Safe