AeroElectric-List Digest Archive

Wed 10/25/17


Total Messages Posted: 4



Today's Message Index:
----------------------
 
     1. 03:48 PM - 406 ground plane (David Saylor)
     2. 04:09 PM - Re: 406 ground plane (Robert L. Nuckolls, III)
     3. 04:11 PM - Re: 406 ground plane (John Cox)
     4. 05:11 PM - LOM Magneto and Shower of Sparks on Z-18 ()
 
 
 


Message 1


  • INDEX
  • Back to Main INDEX
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 03:48:08 PM PST US
    From: David Saylor <saylor.dave@gmail.com>
    Subject: 406 ground plane
    I'm planning to install a new ELT. It comes with a "shark fin" antenna that incorporates the 406 antenna and the antenna for the internal GPS. It has no 121.5 capability. It has a metal base plate, which I thought was sufficient for higher frequencies. However, the installation instructions call for a ground plane of at least 120 square inches, and preferably 300 square inches. Am I missing something? Why would an antenna operating at such high frequencies need such a large ground plane? Isn't the rule that the radius of the ground plane should match the length of the antenna? --Dave


    Message 2


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 04:09:33 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: 406 ground plane
    At 05:46 PM 10/25/2017, you wrote: >I'm planning to install a new ELT.=C2 It comes >with a "shark fin" antenna that incorporates the >406 antenna and the antenna for the internal >GPS.=C2 It has no 121.5 capability.=C2 It has a >metal base plate, which I thought was sufficient for higher frequencies. > >However, the installation instructions call for >a ground plane of at least 120 square inches, and preferably 300 square inches. > >Am I missing something?=C2 Why would an antenna >operating at such high frequencies need such a >large ground plane?=C2 Isn't the rule that the >radius of the ground plane should match the length of the antenna? > >--Dave The 1/4 wave ground plane at the lowest frequency of interest is 300/406 meters = 0.74M x 39.36 in/M x 0.25 yields a radius of 7.25" 7.25 (squared) x 3.1416 = 166 square inches . . . which meets the "120 mininum". Bob . . .


    Message 3


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 04:11:48 PM PST US
    From: John Cox <rv10pro@gmail.com>
    Subject: Re: 406 ground plane
    300 sq. in. would be 17.5 x 17.5 and using six radials of 1" wide copper adhesive tape is commonly used to propagate a solid ground plane. 0/60/120/180/240/300 degrees as the line of longitude runs. John On Wed, Oct 25, 2017 at 3:46 PM, David Saylor <saylor.dave@gmail.com> wrote: > I'm planning to install a new ELT. It comes with a "shark fin" antenna > that incorporates the 406 antenna and the antenna for the internal GPS. It > has no 121.5 capability. It has a metal base plate, which I thought was > sufficient for higher frequencies. > > However, the installation instructions call for a ground plane of at least > 120 square inches, and preferably 300 square inches. > > Am I missing something? Why would an antenna operating at such high > frequencies need such a large ground plane? Isn't the rule that the radius > of the ground plane should match the length of the antenna? > > --Dave >


    Message 4


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 05:11:28 PM PST US
    From: <mike@vision499.com>
    Subject: LOM Magneto and Shower of Sparks on Z-18
    I have LOM engine and have a few questions regarding Z-18 What purpose does the filter F526.910-03 serve, is there anything else available that will serve the same purpose if it is an essential item? The Magneto's that are on my engine do not have a retard terminal as shown in the Shower of sparks article, is the LOM magneto different? I have the starting vibrator LUN 2231 as described on Z-18, should I wire it into the single terminal on the Magneto? Thanks Mike --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus




    Other Matronics Email List Services

  • Post A New Message
  •   aeroelectric-list@matronics.com
  • UN/SUBSCRIBE
  •   http://www.matronics.com/subscription
  • List FAQ
  •   http://www.matronics.com/FAQ/AeroElectric-List.htm
  • Web Forum Interface To Lists
  •   http://forums.matronics.com
  • Matronics List Wiki
  •   http://wiki.matronics.com
  • 7-Day List Browse
  •   http://www.matronics.com/browse/aeroelectric-list
  • Browse AeroElectric-List Digests
  •   http://www.matronics.com/digest/aeroelectric-list
  • Browse Other Lists
  •   http://www.matronics.com/browse
  • Live Online Chat!
  •   http://www.matronics.com/chat
  • Archive Downloading
  •   http://www.matronics.com/archives
  • Photo Share
  •   http://www.matronics.com/photoshare
  • Other Email Lists
  •   http://www.matronics.com/emaillists
  • Contributions
  •   http://www.matronics.com/contribution

    These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.

    -- Please support this service by making your Contribution today! --