• Re: LPDA

    From TOM WALKER@1:123/140 to HOLGER GRANHOLM on Wednesday, June 04, 2014 08:32:00

    The antenna Tom has is apparently based on the same design philosophy
    but instead of parasitic elements the number of phased driven elements HG>are increased.

    Exactically. And most references refer to it as an LPDA design
    The Twin Booms are a modification of the basic design to assist
    impedence matching. The cross over wiring is used but mostly in TV
    antennas. But it still is an LPDA antenna
    ---
    ■ SLMR 2.1a ■ Typo Tom Strkes Again
    * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)
  • From TOM WALKER@1:123/140 to ED VANCE on Wednesday, June 04, 2014 08:36:00
    -snip-
    I cannot come up with any pictures on the interent of a Yagi
    that loks like my Picture ! in my previous posts.
    YES a multipuls band Yagi will have different director lengths
    but they are the same length for each band and do not follow
    the full tapering lengths of the LPDA

    Tom,

    I use Firefox and have the History set just so I can go back to look
    at something that comes to my mind to read it again.

    As long as the address of the page hasn't been changed by a webmaster EV>just my clicking the History option on the Menu Bar and clicking
    the selection for All History, then typing a word or three in the
    Search box usually narrows down to show me the page I was looking for.

    Making Bookmarks helps too. <GRIN>

    I have an extensive bookmark folder in my Firefox. but have all history
    erased upon shutdown.
    I like each session to be a New Adventure. Sometihng that coems easy
    nowdays for me.
    ---
    ■ SLMR 2.1a ■ 0
    * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)
  • From Holger Granholm@2:20/228 to Roy Witt on Friday, June 06, 2014 09:27:00
    In a message dated 06-05-14, Roy Witt said to Holger Granholm:

    GM Roy,

    The antenna Tom has is apparently based on the same design philosophy
    but instead of parasitic elements the number of phased driven
    elements are increased.

    Meanwhile, it isn't even in a class that could be called a LPDA.

    No, that's why it is called LPYA (Log Periodic Yagi Array) often with "bandpass" added to that.

    CU L8ER,

    Holger

    ---
    ■ MR/2 2.30 ■ A friend: someone who likes you even after they know you.
    * Origin: Coming to you from the Sunny Aland Islands. (2:20/228)
  • From TOM WALKER@1:123/140 to HOLGER GRANHOLM on Saturday, June 07, 2014 10:24:00
    The antenna Tom has is apparently based on the same design philosophy

    The Twin Booms are a modification of the basic design to assist HG>TW>impedence matching. The cross over wiring is used but mostly in TV HG>TW>antennas. But it still is an LPDA antenna

    Correction, the dual boom design is the basic one.

    For Transmitting Antennas YES becaue it provides a better feed line
    match.

    BUT for recieve only antennas the single boom is used by some

    And when I tried to interject some ham Termonology I was told by
    Roy that we were talking aobut TV antennas.
    ---
    ■ SLMR 2.1a ■ Typo Tom strikes agaoin
    * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)
  • From Roy Witt@1:387/22 to Holger Granholm on Sunday, June 08, 2014 12:58:42
    Greetings Holger!

    The antenna Tom has is apparently based on the same design
    philosophy but instead of parasitic elements the number of phased
    driven elements are increased.

    Meanwhile, it isn't even in a class that could be called a LPDA.

    No, that's why it is called LPYA (Log Periodic Yagi Array) often with "bandpass" added to that.

    Translated: Yes, that is why the KLM (Log Periodic Yagi Array) often has 'bandpass' added to its description.


    Have a day!

    R\%/itt - K5RXT

    --- GoldED+/W32 1.1.5-31012
    --- D'Bridge 3.99
    * Origin: HAM Radio, aka Amateur Radio. 804? Over! (1:387/22)
  • From Roy Witt@1:387/22 to TOM WALKER on Sunday, June 08, 2014 13:01:59
    Greetings TOM!

    The antenna Tom has is apparently based on the same design
    philosophy

    The Twin Booms are a modification of the basic design to assist
    impedence matching. The cross over wiring is used but mostly in
    TV antennas. But it still is an LPDA antenna

    Correction, the dual boom design is the basic one.

    For Transmitting Antennas YES becaue it provides a better feed line
    match.

    Show me an antenna, RX or TX, that doesn't need feed line matching.

    BUT for recieve only antennas the single boom is used by some

    Yes, I have one of those. It isn't a LPDA, as it more closely resembles
    the KLM LP Yagi...it too has the 'cross-over' matching device on it, but
    each element is insulated from the boom. i.e. a yagi

    And when I tried to interject some ham Termonology I was told by
    Roy that we were talking aobut TV antennas.

    You were mixing yourself up by talking one, then the other. If you want an antenna that can receive locally transmitted high-power signals, no
    biggie, just throw up a long wire and be done with it.

    If you want to reach out and get reception from long distant TV
    broadcasts, you'll need an antenna designed for that.


    Have a day!

    R\%/itt - K5RXT

    --- GoldED+/W32 1.1.5-31012
    --- D'Bridge 3.99
    * Origin: HAM Radio, aka Amateur Radio. 804? Over! (1:387/22)
  • From Holger Granholm@2:20/228 to Tom Walker on Sunday, June 08, 2014 09:30:00
    In a message dated 06-07-14, Tom Walker said to Holger Granholm:

    Hi Tom,

    Correction, the dual boom design is the basic one.

    For Transmitting Antennas YES becaue it provides a better feed line TW>match.

    Feed line matching is also beneficial for receiving antennas.

    And when I tried to interject some ham Termonology I was told by
    Roy that we were talking aobut TV antennas.

    Me too !!!

    CU AGN, Sam, OH0NC

    aka Holger

    ___
    * MR/2 2.30 * This OS/2 system uptime is 625 days 17:47 hours (en).

    --- PCBoard (R) v15.22 (OS/2) 2
    * Origin: Coming to you from the Sunny Aland Islands. (2:20/228)
  • From TOM WALKER@1:123/140 to ROY WITT on Monday, June 09, 2014 07:20:00

    The antenna Tom has is apparently based on the same design
    philosophy

    The Twin Booms are a modification of the basic design to assist HG>TW>> impedence matching. The cross over wiring is used but mostly in HG>TW>> TV antennas. But it still is an LPDA antenna

    Correction, the dual boom design is the basic one.

    For Transmitting Antennas YES becaue it provides a better feed line match.

    Show me an antenna, RX or TX, that doesn't need feed line matching.

    A longwire thrown out the windoww rr conected to a tree.


    You were mixing yourself up by talking one, then the other. If you want an RW>antenna that can receive locally transmitted high-power signals, no RW>biggie, just throw up a long wire and be done with it.

    I already know that and a great deal more about radio theory then you
    think

    ---
    ■ SLMR 2.1a ■ Typo Tom strikes agaoin
    * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)
  • From TOM WALKER@1:123/140 to HOLGER GRANHOLM on Monday, June 09, 2014 07:24:00

    Correction, the dual boom design is the basic one.

    For Transmitting Antennas YES becaue it provides a better feed line HG>TW>match.

    Feed line matching is also beneficial for receiving antennas.

    Of course but is far less critical. Hense a length of wire tied to a
    tree outside a window can provice some very nice Short Wave listening.

    ---
    ■ SLMR 2.1a ■ Typo Tom Strkes Again
    * Origin: Fidonet Since 1991 bbs.docsnetservices.com (1:123/140)