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Thread: MCLAPP vertical 8-bay build, slight increase in pole height and dedicated DX'ing TV?

  1. #11
    Join Date
    Jul 2016
    Location
    Rogersville MO
    Posts
    101

    Default

    Sorry I haven't updated for so long, things been kinda busy around here with the new shop going up, and I wanted to test the antenna out over a couple weeks.

    Before I start, let me say Jim Thomas has been a tremendous help to me with my DX'ing. Recently he ran an elevation report for me and found that with the exception of north-northeast to east-northeast....there's nothing in the way of my antenna. For reference I am near the town of Rogersville MO. The elevation here is about 1420 feet and is one of the higher up places within 10 miles. The best view for my antenna is basically from east to south to west. According to Jim, if a straight line were drawn out 10 miles at 240 degrees, an antenna at that location would have to be on a 281 foot tower to equal the height of my antenna here.

    I am 100% certain this explains at least some of the reason I'm seeing the performance I am from this antenna. Some other reasons: The coax I'm using to test this antenna is 40' long and a straight shot from the transformer to the tuner box, no junctions. On the other hand there's no pre-amp and the antenna was anywhere from 14 inches to 10 feet or so off the ground measured to the bottom screen reflector.

    I deployed the antenna from 5pm to as late as 3am nearly every day. During these times, when I point it towards Kansas City, at least one Kansas City station decodes. It's usually KCTV or KPXE first, but as the sun starts to set, eventually the stations I can get all show up. The signal usually swings wildly from super strong to super weak but as the night wears on things stabilize and the KC channels become watchable a good part of the time. With or without enhancement indicated on APRS, Kansas City seems to show up regularly.

    It's the same way for stations in Joplin, northwest Arkansas and Little Rock, with or without enhancement. if I point it their way at least one of that market's stations will decode with a swinging signal that eventually stabilizes around and after sunset. With Joplin (269deg@90mi) it's usually 43/12 KODE....and that's with KYTV 44/3 close (55deg@11mi) and kicking out a 1Mw signal. Northwest Arkansas is 50/51 KNWA (235deg@66mi) and Little Rock is usually KATV 22/7 (169deg@165mi) with KOZK 23/21 (55deg@12mi) adjacent. The signal from Little Rock swings more wildly and is less watchable than KC until later in the evening.

    When I point the antenna towards Memphis, Jonesboro AR Tulsa and St. Louis I see evidence their signals are there, but they're usually way too weak to decode without some kind of enhancement present. I like to call this "in the background".

    The first night I put it out on my front porch I got full decodes from 4 Dallas TX market stations @380mi and decoded the big four stations in Oklahoma City @265mi with tropo present. What's remarkable about that is only half the antenna could see over the roof to get them. This antenna has garnered me about 12 new logs in the past two weeks.

    The signal levels are anywhere from two to fifteen times better than the Hobotenna and the stock Winegard PR8800 I got from Jim. The PR8800 would not gather enough signal to decode K26GS in Harrison Arkansas (178deg@66mi, 11.2Kw, 2edge, predicted NM 1.7 and power -89.2dBm), averaging a signal strength of 5 to 8 on the Digital Stream box. It always decodes with the Megatenna at an average ss of 36-39, after sunset raising to the mid 40's.

    I see no reason not to put the Megatenna in to service. Now that my 19'2" tall shop is done it will make for a great place to put a pole. The bottom of the antenna is planned to be 10 feet over the metal galvalume ribbed roof (unless anyone can see a reason to go up more) placing the top of the upper receiving assembly at about 37 feet.

    For now I'm done with testing. I don't want to take a chance damaging it....since it only took 3 months to complete. It would take a heck of a good DX forecast for me to put it back out, until it goes on the pole. Once it's in real-time service I'll start officially logging and reporting DX with it. Will keep everyone posted as time permits!

  2. #12
    Join Date
    Jul 2016
    Location
    Rogersville MO
    Posts
    101

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    Last night and this morning we had a DX event strong enough to warrant deploying the Megatenna. About 8:30PM I put it out on the front porch settling on a southwest point.

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    If you noticed, only slightly more than half of the MT is over the roof line, and the new shop (at 19’8” tall) is just left of most of the MT’s beam width. These are the logs from this direction.

    NOTES: I am located 5 miles south of Rogersville MO
    * denotes a new log

    KXNW 34/34 Eureka Springs AR
    KNWA 50/51 Rogers AR
    KHOG 15/29 Fayetteville AR
    KODE 43/12 Joplin MO
    KFJX 13/14 Joplin MO
    KSNF 46/16 Joplin MO
    KOAM 7/7 Pittsburg KS
    KEMV 13/6 Mountain View AR
    KAFT 9/13 Fort Smith AR
    KFSM 18/5 Fort Smith AR
    KJRH 8/2 Tulsa OK
    KOTV 45/6 Tulsa OK
    KOED 11/11 Tulsa OK
    KMYT 42/42 Tulsa OK
    KKYK 30/16 Little Rock AR
    KTHV 12/11 Little Rock AR
    KLRT 30/16 Little Rock AR
    KATV 22/7 Little Rock AR
    KVTN 24/25 Little Rock AR
    KARK 32/4 Little Rock AR
    KTVE 27/10 El Dorado AR
    KFOR 27/4 * Oklahoma City OK
    KOCO 7/5 Oklahoma City OK
    KWTV 39/9* Oklahoma City OK
    KTBO 15/14* Oklahoma City OK
    KOCB 33/34 Oklahoma City OK
    KUOK 36/29* Oklahoma City OK
    KAUT 40/43 Oklahoma City OK
    KOCY 48/29* Oklahoma City OK
    KTUZ 29/30* Shawnee OK
    KTEN 26/10 Ada OK
    KSWO 11/7* Lawton OK
    KJTL 15/18 Wichita Falls TX
    KAUZ 22/6* Wichita Falls TX

    The antenna direction is noted in degrees for the remaining captures, these were mainly received this morning. This is the view of the MT to the south southwest:

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    K26GS 26/26&12 Harrison AR 168
    KAIT 8/8 Jonesboro AR 151
    KTEJ 20/19 Jonesboro AR
    KJNB 42/42* Jonesboro AR
    KVTJ 48/48 Jonesboro AR
    WSIL 34/3 Harrisburg IL 080
    WATN 25/24 Memphis TN 130
    WPXX 51/50 Memphis TN
    WBUY 41/40 Holly Springs MS
    KETS 7/2 Little Rock AR 168
    KLRA 20/49 Little Rock AR
    KASN 39/38 Little Rock AR
    KTVV 18/18* Hot Springs AR 168
    WMAO 25/23 Greenwood MS 158

    All sub-channels included there were 158 total out of market channels logged for this event.

    Here’s some screen shots!

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    This was my best night ever, so when DX conditions are sufficient there will be future MT deployments and reports that will follow!

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