Avionics-List Digest Archive

Sun 07/13/14


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 01:56 PM - King KX155 weak VOR reception (Jimmyb)
     2. 04:45 PM - Manual for Vision microsystems EPI-800 engine monitor (Alan Barnett)
 
 
 


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: 01:56:44 PM PST US
    Subject: King KX155 weak VOR reception
    From: "Jimmyb" <James@newazrealty.com>
    Hello all, New member here! I'm having an issue that I wanted to share with some of the more experienced members on here hoping to find a resolution. I have two king KX-155 Nav/Coms one with GS and the other without GS installed in a Glasair III with a single NAV antenna feeding both radios including GS via a multiplexer. The NAV antenna is embedded in the horizontal stabilizer as the Glasair is a composite aircraft. The NAV indicators are KI-209 and a KI-208. Both indicators exhibit erratic needles when turning but only through a portion of the turn (example: sometimes when intercepting a radial the needle will start to move in and nearly be centered but as I roll out expecting to capture the radial the needle suddenly moves three-quarter scale deflection. Also when flying an ILS the GS flag pops in and out of view well down the approach when the GS signal should be strong. All needles are not as stable as I think they should be. I recently had both radios checked out at the local avionics shop and they are performing within specs. The thought now is that I either have an antenna or a feedline issue. The multiplexer currently has one open port that used to service a second glideslope receiver. I've ordered a 50 ohm BNC terminator to cap the open port thinking that I might be getting some reflections/interference that is causing the issue but that has yet to be proven. The aircraft was built in 1990 so all of the coax is original RG58. If the 50 ohm Terminator doesn't solve my problem the next logical step is to replace the RG58 with RG400 but I'm starting to feel like I'm grasping at straws. With no antenna analyzer/distance to fault meter I have no way to verify the condition of the antenna/coax. Questions: 1. Do you think it's likely that the open multiplexer port could be causing my issues? 2. How likely is it that the old RG58 cable could be causing my issues? 3. Should I bite the bullet and buy an antenna analyzer such as the rigexpert AA 600? NOTES: Because the NAV antenna is embedded in the horizontal stabilizer it is physically impossible to access the antenna. The best that I can do will be to replace the RG58 with RG400 but even at that there's will still be approximately 2 feet of the old RG 58 left that is inaccessible the so I will need to install a BNC connector back near the tail to connect the old RG58 (short pigtail that will still be connected to the antenna) with the new RG400. Your ideas, tips & suggestions will be most appreciated! James Phoenix, AZ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=426590#426590


    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: 04:45:19 PM PST US
    From: Alan Barnett <alansbarnett@verizon.net>
    Subject: Manual for Vision microsystems EPI-800 engine monitor
    Does anyone have a digital copy of the manual for the Vision microsystems EPI-800 engine monitor? I bought a plane with an EPI-800 installed, but most of the installation manual was lost. I'm particularly interested in the wiring associated with the backlighting system. At present, the backlighting doesn't work at all. It's supposed to sense the voltage on the lighting bus. My plane has no lighting bus, and the builder disconnected the lighting wiring for the VOR head and the transpondes, so I assume he disconnected wiring for the EPI-800 as well.




    Other Matronics Email List Services

  • Post A New Message
  •   avionics-list@matronics.com
  • UN/SUBSCRIBE
  •   http://www.matronics.com/subscription
  • List FAQ
  •   http://www.matronics.com/FAQ/Avionics-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/avionics-list
  • Browse Avionics-List Digests
  •   http://www.matronics.com/digest/avionics-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! --