archive2009-14.pdxradio.com » Portland Radio

Stuck on daytime power/pattern

(29 posts)
  • Started 5 years ago by Alfredo_T
  • Latest reply from Craig_Adams

  1. Alfredo_T
    Member

    To avoid cluttering the DX thread, I'm starting a thread on AM stations that are slipping up and not going to nighttime patterns and/or power levels after sunset.

    Yesterday evening, I was listening to KOMO, when I started to hear organ music and what sounded like a Catholic mass. This appears to be KCEO (Vista, CA), which airs Immaculate Heart Radio.

    Posted on September 26, 2014 - 02:30 PM #
  2. Broadway
    Member

    Yep, heavy null to the north nights...
    http://radio-locator.com/cgi-bin/pat?call=KCEO&service=AM&status=L&hours=N

    Posted on September 26, 2014 - 03:33 PM #
  3. Andy_brown
    Member

    Which is antithetical to Alfredo's reception, Broadway. Duh. With a null coming this way, that doesn't explain the phenomenon. In fact, it contributes to better KOMO reception @180º from Vashon Island. This is all about skywave.

    The reason for your picking them up, Alfredo, is that the large body of KCEO's signal (their major lobe) is over sea water which provides an excellent skywave propagation, better than the best ground field.

    Posted on September 26, 2014 - 03:43 PM #
  4. W7PAT
    Member

    When I was down in LA and Longbeach last spring I never heard KCEO, but KOMO had a good signal there, even better than KEX and KPNW.

    Posted on September 27, 2014 - 07:32 AM #
  5. Alfredo_T
    Member

    I had never heard KCEO before. When I checked Radio-Locator, I suspected that perhaps, KCEO has built out its construction permit for 10 kW daytime (see pattern here: http://www.radio-locator.com/cgi-bin/pat?call=KCEO&service=AM&status=C&hours=D ), and they forgot to switch back to the nighttime pattern.

    Posted on September 27, 2014 - 07:19 PM #
  6. Broadway
    Member

    >>they forgot to switch back to the nighttime pattern.
    My point earlier...no duh...

    Posted on September 27, 2014 - 07:48 PM #
  7. Andy_brown
    Member

    "forgot to switch back to the nighttime pattern."

    Unlikely. That wreaks havoc. Ignore Broadway. He has no clue. Also, quit using radio locator's pattern to answer questions like this. The new 10 kW day pattern is still directional and northward radiation is reduced to about half of what they radiate @ 305º. Sort of like what a 5 kW non directional would be in that (0º) direction. You can't see that by looking at radio locator, but you can by looking at the e field chart. So even if they failed to switch pattern, it would not overcome KOMO's 50 kW flamethrower with full power south to Portland. KCEO has been DA-2 (directional 24 hours, different patterns day and night) for a long time. They aren't going to "forget" to change patterns.

    It's skywave phenomenon. Period. Broadway, go thump your bible.

    10 kW Day pattern:

    http://transition.fcc.gov/ftp/Bureaus/MB/Databases/AM_DA_patterns/1555654-121358.pdf

    Posted on September 27, 2014 - 10:01 PM #
  8. boisebill
    Member

    I don't hear KCEO now. But I have in the just before past before sunset and after sunrise.

    Since we're getting near the end of the month the pattern change times (based on the average sunset time for the month) are ending up after the sun actually sets. So it's quite possible to hear a them operating legally for a short period after the sun actually goes down.

    Skip on the AM band can go on all day in the winter and you can get some enhancement along the day/night boundary well before sunset.

    As for "forgetting" to change to night. Tonight I had to text another engineer that his station didn't change to night pattern. Turned out he has an equipment failure.

    DX lists are littered with reports of stations "forgetting" to switch to night. Or (wink wink) there's a local high school football game to broadcast.

    Posted on September 27, 2014 - 11:05 PM #
  9. jr_tech
    Member

    Perhaps KCEO was heard here due to poor reception conditions affecting KOMO... We have had lots of solar activity lately... a good solar flare could reduce skywave (ionospheric) propagation, possibly reducing skywave from a station north of our location much more than that of one to the south.

    Posted on September 28, 2014 - 12:54 PM #
  10. Alfredo_T
    Member

    KOMO was pretty weak when I heard KCEO break through, so unusual skywave propagation was a definite factor at the time.

    Posted on September 28, 2014 - 01:20 PM #