REFLECTOR: : Transponder Antennas

Matt Bucko mbuc310 at cox.net
Mon Feb 25 10:25:33 CST 2008


Putting any antenna near or on  carbon almost guarantees that the signal
will be attenuated to nothing. Transponder or com... the signal dies.
Matt
  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
Behalf Of Kirk Aragon
  Sent: Monday, February 25, 2008 9:16 AM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Transponder Antennas



  Craig,

  I've temporarily installed the Advance Electronics com/nav antenna to fix
an issue on my aircraft. The original builder chose to use "Wingco" winglets
(Alan Shaw) which are made of carbon fibre. It appears that transmission
where the antenna is bonded to the carbon fibre is next to impossible. This
results in a highly directional antenna (i.e. I can transmit through the
side of the winglet that is not bonded directly to the antenna).

  The new antenna has only been tested on the ground, but reception is
already confirmed 5+ miles as compared to 100 yards previously. I'm looking
forward to testing it in the air in about 2 weeks.

  Kirk





----------------------------------------------------------------------------
    From: cdwoolston at sbcglobal.net
    To: reflector at tvbf.org
    Date: Mon, 25 Feb 2008 05:05:57 -0800
    Subject: REFLECTOR: Transponder Antennas


    Hey all-



      John and I have a homemade ¼ wave transponder antenna mounted under
the battery in the nose of the aircraft (completely) inside.  When we first
started flying we got occasional complaints here in SoCal about losing our
beacon.  Now it happens much more frequently and it appears to be when we
are low and in the “ground clutter”.  The frustrating part is the GTX 330
shows a reply light even when ATC says they can’t see the code.  They are
getting a primary but no code.



    Where have other located their antennas and what type?



    Has anyone tried the Archer or Advance Electronics Antennas I see in AS?



    Craig

    250hrs…XL-5FG Flying in Lancaster, CA


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20080225/7274e411/attachment.htm 


More information about the Reflector mailing list