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DX: What's Possible? Primer for new DXers

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  • KW4RZ
    replied
    Often during trans-gulf tropo conditions during the day propagation over land will dissipate but continue over water allowing coastal Texas and Mexican FM stations to be received easier. I made this FM Es graph some time ago based on all signals logged from 2005-2009. A lack of targets beyond 1500 miles due to endpoint being in rural Rocky Mountain regions or over water certainly lowers the higher numbers.graph.jpg

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  • Danny
    replied
    In doing a little bit of research, I've come to this conclusion: While 9am to 9pm tropo is not common in
    some regions, afternoon tropo (especially on FM) is indeed more common in other regions.

    However, it appears that the number of *daytime* tropo events in one year is not as plentful as the number
    of *daytime* E-skip events during a one-year period.

    Nevertheless, my words about 9 - 9 are *not* correct for every region.
    Last edited by Danny; 12-24-2013, 06:36 PM.

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  • Danny
    replied
    Reading articles about propagation, watching videos, and listening to audio clips are very useful for DXers.

    However, my feeling is that all of the talk, articles, videos, and audios in the world won't replace actual DXing experience
    in understanding the differences in propagation modes.

    As far as generalizations and exceptions go, a newcomer will understand that Es and tropo events can occur at any time
    if he/she reads Doug's original post.

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  • Mike-CT
    replied
    One thing to remember is that we're writing in generalizations. There are exceptions to everything said in these posts, of course, but we're making generalizations here. To cover all bases, let's just say that your mileage may vary.

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  • Danny
    replied
    Many thanks, Mike.

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  • mp11
    replied
    Danny I wouldn't delete any posts, nor would I apologize for any statements made. I believe every member here understood what you meant. Of course there are exceptions to that rule. As far as newbies go...there is a learning curve that goes with any hobby. It wouldn't take a newbie long to realize there isn't really a switch that turns propagation on at 9am then off at 9pm. It's hard to imagine that the omission of one little word "most", could cause such a stir from a member. I think his response to what you said was a little too direct, and could have been worded in a more respectful manner. I think you deserve that much. After all...you sir, have made enormous contributions to the forum, and the hobby.

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  • Russ-PA
    replied
    I've DX'ed FM at least somewhat seriously in NJ, EPA, NE ME, Central GA, and SE VA, so I know that there are substantial variations. What Gulf Coast DX'ers experience in
    terms of tropo is quite different from what DX'ers elsewhere experience. But my point was that in something intended to instruct beginners, I think we are better served to
    provide info in simple terms, but not to mislead. Generalizations ( and I forget which famous person once said "All generalizations are false, including this one" ) can be misleading, and I believe that to be true in this case - it's too easy for a beginner to draw erroneous conclusions.

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  • Russ-PA
    replied
    <Here are some very basic *general* laws.

    Es occurs 9am to 9pm. Tropo 9pm to 9am. >

    I have to dispute this. It simply isn't supportable. I have at many times and in many locations observed DX via these modes at almost any time of the day, and I've seen numerous reports from others as well.

    One might be able to say that Es occurs more frequently within the hours noted above, but one could not say the same for tropo events, as I can vividly recall tropo events over the years where the tropo persisted 24/7 for 2 or 3 days.

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  • MarioMania
    replied
    E's are rare in California on Radio

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  • Guest's Avatar
    Guest replied
    For the most part, tropo events with their slow fade in/out behavior aren't very well-suited to keeping records to make diurnal graphs like is the case for the more-sharply defined Es events. Also, one would have to define some sort of minimum distance for a tropo "event", which would likely be different for each observer. Alternately, a selected rare path (like here to Miami) could be chosen and the diurnal behavior of that documented - but that rarity itself would result in a paucity of data to make a meaningful graph plot from.

    73, Pat - WA5IYX

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  • Guest's Avatar
    Guest replied
    The tropo seems to be common in the Midwest and Gulf coastal area, and along the Atlantic Coast (where the DX is usually confined to south and east of the Appalachians). Seem less common in the Pacific NW area, much less so nearby mountain areas.

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  • Guest's Avatar
    Guest replied
    http://www.qsl.net/wa5iyx/#audio hardly a brief listing, but the prop mode of each clip is noted (Es, ms, tropo, F2, and even a few aurorae) However, the latest Real Audio Player doesn't display the complete textual info that I added when encoding them from WAV files (lacks the date/time of the original tape). There are too many to convert to mp3 and make all the data part of a very long title for each. (I've a backlog of some 4,000 ra clips with MANY more not even yet done from 45+ years of tapes).

    73, Pat - WA5IYX
    Last edited by pjdyer; 12-12-2013, 04:13 AM. Reason: spelling

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  • DX Grrl
    replied
    One more small suggestion: brief recordings of what each propagation mode sounds like, or a link to Mike-CT's recordings. Some people may need an aural example to cement the knowledge.

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  • Danny
    replied
    There are many articles about propagation on the Internet. Here are a few from WTFDAers.

    Girard's Propagation article
    http://www.dxfm.com/Content/propagation.htm

    Glenn Hauser's Propagation article
    http://www.anarc.org/wtfda/propagation.htm

    Pat's site
    http://qsl.net/w/wa5iyx/

    Frank Aden's Meteor Scatter article
    www.wtfda.org/mem/mscatter.pdf‎

    Mike Hawk's Es article
    http://www.anarc.org/wtfda/sporade.pdf

    Todd Emslie's site (Todd was a WTFDAer at one time)
    http://home.iprimus.com.au/toddemslie/dx.html
    Last edited by Danny; 12-15-2013, 10:36 PM. Reason: Added two links

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  • Guest's Avatar
    Guest replied
    http://www.qsl.net/wa5iyx/images/SUFM0006.gif This is the diurnal plot of FM Es from my data for May-Aug 2000-2006 so some 40 years "newer" than that 1963 one was. I've QBASIC programs written up to handle these from properly-formatted text files of the events so can combine/sort by years/months. Beats manually using graph paper (with 5 div. per hour) like I did for them 1963-69 before I realized that a numerical matrix (1440/5 per day) would be best-suited for computer manipulation. Those matrices are what WA0EKO used (via key punched cards) on the IBM7040 at the DoC in Boulder in Aug 1971 to make the plots in this http://www.qsl.net/wa5iyx/papers/rs1972b4.htm for my 1964-70 50-MHz Es data. (The graphs were output on 35-mm film which was then used to make acetate transparencies for my presentation at the Sept Es Conference at Utah State http://www.qsl.net/wa5iyx/images/Logan71sk1.jpg).

    73, Pat - WA5IYX

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