HOW DO you do this GREYLINE Stuff?

Discussion in 'Discussions, Opinions & Editorials' started by WA6MHZ, Oct 21, 2011.

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  1. WA6MHZ

    WA6MHZ Subscriber QRZ Page

    Way back I had a little slding world map with a Greyline chart on it that was supposed to tell me when I would get good DX. It is one of the FEW things I sold on Ebay. Perhaps I shoulda kept it.

    For NOW I need it desperately to tell me WHEN I have a shot at the T32C on 160M

    This morning I tried again, and at sunrise, I DID hear them briefly, but not good enough to make a contact.

    Maybe it WASN'T sunrise. What is the determining factor of a "SUNRISE"?
    Is it when the sky starts to lighten from Darkness? Or when you actually see the SUN coming over the horizon? How long does "Sunrise" last?

    And with this little chart, it seemed like you had to coordinate Sunrise here with Sunset THERE for it to work.

    Since I have such a MARGINAL 160M station, I need to know EXACTLY when to call the T32C. 160 is the ONLY band (except 6) I am short on, so I am Desperate to make the contact.

    So just what is this "GREYLINE" stuff and how does it work? It MUST work or no one would be using it. What bands does it work on?

    Any QRZeders use it?
  2. K7JBQ

    K7JBQ Moderator QRZ Page


    You're a little too close to T32C to get much horsepower out of grayline.

    I just checked the SR and SS for both ends of the path, using my QTH, which isn't far from yours.


    Sunrise 1406
    Sunset 0108


    Sunrise 1622
    Sunset 0417

    Easiest way I know to check is W6ELProp, but I don't have 160m set up in my configurations.

  3. K7MH

    K7MH Ham Member QRZ Page

    It is just going to be a short period of time as the Sun rises or sets. Maybe 15 minutes give or take.
    At least that is all I have experienced.
    Signals just peak up a bit sometimes enough so that you can work them.

    Even on 160 I think you should have a fairly easy time working T32 without any special mode of propagation.
  4. KB3LIX

    KB3LIX Ham Member QRZ Page

    Download the N1MM logging program.
    Even if you do not use the logging program,
    there is a greyline program included with the package.

    It is FREE...Right in your and my price range.
  5. KG6MZS

    KG6MZS Premium Subscriber QRZ Page

  6. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    I don't think there's a greyline path to T32. Both stations have to be on the greyline, and we aren't, with them.

    I'd just swing the ol' 160m beam around and give 'em a call.:eek:
  7. W5BIB

    W5BIB Premium Subscriber QRZ Page

    Might also go to
  8. G0GQK

    G0GQK Ham Member QRZ Page

    Iv'e never tried any of this fancy stuff, I can't stay awake, and then after getting out of bed a couple of times I can't find enough energy to get up, so sunrise or sunset has to correspond with somewhere on earth doing the same.? Why has nobody ever made a list of where this happens, or is it too complicated ? High and low tide tables are complicated but they've been doing that for 3,000 years
  9. W4PG

    W4PG Super Moderator Staff Member Platinum Subscriber QRZ Page

    Pat, like others have said, there is no greyline from your QTH to there. You need to get up well before sunrise and just hope they are on to work them. HRD has a built-in greyline display on the main logging program display. I actually have a separate monitor to run the rotor program on, which shows the entire Earth and which areas are in light and dark. I can immediately see which areas might benefit from greyline propagation with a quick glance at the monitor.

  10. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Not complicated but it constantly changes with the earth's tilt. No two days in a row have exactly the same grey line pattern, and of course each season the change is rather drastic.

    No reason for a "list" when there's a real, live, accurate continuously updated map on line as given in post #7, above.
  11. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    I can see the gray line in the mirror's where the gray hair meets the brown hair on my head.

    The gray is slowly taking over, however, and someday the line will disappear.
  12. KS2G

    KS2G Subscriber QRZ Page

    The slide-rule-like gray line gadget was "the DX Edge" developed many years back by Tony Japha, N2UN.

    Long since discontinued, due to the availability of gray line computer programs and on-line resources cited in earlier posts.

    But I still have one, and use it all the time in contests.

    One earlier post stated that to benefit from gray line propagation both stations must be in their respective sunrise/sunset zones. That's not so.

    Read up on gray line propagation at:

    Mel - KS2G
  13. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    I didn't see anything in Paul's writeup that contradicts the statement that both stations need to be on or very close to the gray line in order for this to work.

    Fact is, southern CA and T3 are never anywhere near the terminator at the same time, ever; so it's not a gray line path.
  14. KL7AJ

    KL7AJ Ham Member QRZ Page

    During the winter here in Fairbanks, the Gray Line runs due East and West! :)
  15. W5BIB

    W5BIB Premium Subscriber QRZ Page

    Crapola!! I think I'd move!! lol But then again,... The "GRAY LINE" can only run east & west here. yuk yuk..
  16. K7MH

    K7MH Ham Member QRZ Page

  17. W4PG

    W4PG Super Moderator Staff Member Platinum Subscriber QRZ Page

    During spring and fall, it runs due north and south here! :)
  18. W5BIB

    W5BIB Premium Subscriber QRZ Page

    Think you're confused with the 'snowbird line' !! lol
  19. W5BIB

    W5BIB Premium Subscriber QRZ Page

  20. K7UNZ

    K7UNZ Ham Member QRZ Page

    I offer the following, with no scientific explanation, charts, or technical support. Simply based upon my own experience during the winter months to the Pacific and Europe, on 80/40/30 meters. Also bear in mind what has already been said...there is no hard and fast rule on when and where, or if, it will occur.

    One hour before to an hour after local sunrise.
    If you don't know sunrise time, look out the window.

    There also seems to be the same effect with sunset, but not as least at my qth.

    73, have fun...Jim/K7UNZ
    Tucson, AZ
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