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Thread: DX: What's Possible? Primer for new DXers

  1. #11
    Join Date
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    15 mi. N of Boston MA
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    Don't forget about F2 propagation minimums and maximums (Hawaii to Boston MA, on SSB, roughly 5,000 miles in the summer of 1978, Cycle 21!). Mike-CT's site has a great example of the potential, with a super clear recording of a San Francisco CA police frequency, and analogue TV receptions. Also mention the properties of meteor scatter and its' similarity to Es.
    2010 Honda Fit stock radio.
    Grundig G8 ultralight .

  2. #12
    Join Date
    Jul 2005
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    Shreveport, LA
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    After running a Web site about Mexico TV DX for fifteen years, I can assure you from my experience that DXers (like many
    other computer users) don't always have the time or interest to read long articles.
    Last edited by Danny; 12-24-2013 at 06:37 PM.
    Danny
    Shreveport, LA
    Mexico/Latin America TV DX ID Tips http://www.tvdxtips.com
    Submit and read DTV Stats http://www.tvdxexpo.com/dtvdxrecords.html
    TV and DTV DX Photographs http://www.tvdxexpo.com
    My Photographs of 100 Mexico TV DX Local IDs http://www.tvdxexpo.com/100mexicotvids.html
    More than 1,100 TV logs since 1994

  3. #13
    Join Date
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    15 mi. N of Boston MA
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    Very good point. Too much information can be a little intimidating and confusing to newbies.
    2010 Honda Fit stock radio.
    Grundig G8 ultralight .

  4. #14
    pjdyer Guest

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    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

  5. #15
    Join Date
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    Location
    Shreveport, LA
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    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 at 10:36 PM. Reason: Added two links
    Danny
    Shreveport, LA
    Mexico/Latin America TV DX ID Tips http://www.tvdxtips.com
    Submit and read DTV Stats http://www.tvdxexpo.com/dtvdxrecords.html
    TV and DTV DX Photographs http://www.tvdxexpo.com
    My Photographs of 100 Mexico TV DX Local IDs http://www.tvdxexpo.com/100mexicotvids.html
    More than 1,100 TV logs since 1994

  6. #16
    Join Date
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    15 mi. N of Boston MA
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    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.
    2010 Honda Fit stock radio.
    Grundig G8 ultralight .

  7. #17
    pjdyer Guest

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    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 at 04:13 AM. Reason: spelling

  8. #18
    Join Date
    Dec 2013
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    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.

  9. #19
    pjdyer Guest

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    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

  10. #20
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    May 2013
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    United States
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    E's are rare in California on Radio

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