Transponder Ant. was Re: REFLECTOR:anntenas

[Ronnie Brown]

Scott, I put my transponder antenna under the battery and my GPS antenna is
on top of the canard under the cover.

All works well in 11 hours of flight testing.  I have contacted approach and
they are seeing me fine.  And my GPS is working great too.  Now if I can get
my prop back from Catto, I'm ready to go fly some more!

Ronnie

----- Original Message -----
From: "Scott Derrick" <scott@tnstaafl.net>
To: <reflector@tvbf.org>
Sent: Friday, April 11, 2003 10:21 PM
Subject: Re: Transponder Ant. was Re: REFLECTOR:anntenas


> I like that position!!  Close to the radio, out of the way.
>
> The transponder in in the 2 GHz rangem whats the GPS signal in?
>
> Scott
>
> Alexander Balic wrote:
> > I placed my transponder antenna/ground plane under the battery (up
front)
> > barely fits between the bottom of the battery tray and the fuselage, but
> > nothing is in the way of it there, and the coax run is really short I'm
not
> > quite flying yet, so I can't vouch for the reliability of signal there,
but
> > it should be good.
> >
> > -----Original Message-----
> > From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> > Behalf Of Scott Derrick
> > Sent: Friday, April 11, 2003 7:13 AM
> > To: reflector@tvbf.org
> > Subject: Transponder Ant. was Re: REFLECTOR:anntenas
> >
> >
> > I'll second Wayne's "DO NOT" for the transponder. Mine is in the strake
> > in the outside wing bolt hole space.  I get periodic complaints from ATC
> > about intermittent transponder.  I think I'll purchase another antenna
> > and try mounting one closer to the transmitter.
> >
> > I don't want it out side though, don't have any external antennas now,
> > and don't want any.
> >
> > Where's a good spot in a standard RG?  I was thinking about mounting it
> > to the bottom of the rear seat?
> >
> > How big does the ground plane need to be?
> >
> > My GPS antenna is mounted to the inside of the nose access door, 4 feet
> > of cable and works great.
> >
> > Scott
> >
> > Wayne Lanza wrote:
> >
> >>
> >>Regarding the antennas, our experience at the builders center points to
> >>the following:
> >> > Transponder ANT = between the firewall and gear bulk head, on center
> >>line. DO NOT
> >>put this ANT out in the strake, many transponders don't like to drive
> >>this much wire!
> >> > GPS = on top of the landing light or on top of the canard, keep this
> >>wire under 8' long.
> >> > Marker Beacon = Inside or outside of the keel, or on the floor near
> >>the keel. Locate
> >>the foil such that you don't tear it up when upholstering or mounting
> >>the seats...
> >> > Glide Slope = On the floor under the copilot front seat area.
> >> > AM/FM = Not too critical, string a 23" piece of the ANT wire (center
> >>conductor only)
> >>across the under side of the structure in front of the canopy. Make sure
> >>that the pitch
> >>trim spring doesn't interfere.
> >> > ELT = Mount the ELT to the floor between the gear bulk head and the
> >>keel bulk head
> >>on the copilot side. Run two 23" foils on a diagonal centered at the
> >>fuselage joint, the
> >>angle of the foils is such that they are fairly straight (they might
> >>wrap onto the ceiling).
> >>This is not super critical, but this antenna should be vertically
> >>mounted not horizontal!
> >>Use the torroids and connect the coax braid to the lower foil. Secure
> >>foils, torroids and
> >>the end of the lead in coax with 1 ply of bid. This needs to be
> >>shock/impact secured.
> >> > ADF = I've heard of them :-)
> >>
> >>In general, use the correct type of coax (not TV wire or solid center
> >>conductor), use the
> >>proper BNC terminals and appropriate tools. Keep the coax runs short and
> >>secure.
> >>
> >>Fly Safe,
> >>Wayne Lanza
> >>Composite Design, Inc.
> >>(electrical weenie at the Velocity Builder's Center)
> >>____________________________________________________________________
> >>On Friday, April 11, 2003, at 06:37 AM, Lynn Gallup wrote:
> >>
> >>    Noel,
> >>    As near as possible, I followed the suggestions in the Velocity
> >>    manual. After 185 hours flying my airplane in a wide variety of
> >>    circumstances I can pronounce perfect operation of my nav & com
> >>    radios, localizer & glideslope, marker beacon receiver and
> >>    transponder. Even the ADF works acceptably although its range is a
> >>    little short. The GPS would benefit from shielding or a slight
> >>    relocation as it will blank out if one of the nav receivers is tuned
> >>    to a particular VOR frequency. (Leakage of nav's IF frequency signal
> >>    out of the localizer antenna overcomes the satellite signals.)
> >>
> >>    Mine is a hatch door, long wing, RG. The antenna locations are:
> >>
> >>    Com antennas - In the tip sails.
> >>    Nav antenna - One shared antenna on top of fuselage about four
> >>    inches forward of engine bulkhead.
> >>    Marker beacon antenna - Along right side about two inches below
> >>    windows.
> >>    Transponder antenna - Bottom of fuselage below right rear seat.
> >>    ADF antennna - Bottom of fuselage below left rear seat.
> >>    Localizer antenna - On canard top surface, center-line of fuselage.
> >>    GPS antenna - Front of canard top, centered. Forward of localizer
> >>    antenna. It should be remounted under the top of the fuselage above
> >>    the localizer antenna.
> >>
> >>    Regards,
> >>    Lynn
> >>    =====================
> >>    At 11:46 PM 4/10/2003 Thursday, you wrote:
> >>
> >>
> >>    Now that it's finally starting to warm up, I'm doing the planning
> >>    for my summer project... The wings / canard.
> >>    I realize that antenna placement is variable, But...
> >>    What do I really need? Do I need a Com and Nav in each wing?
> >>    Where's the best place for a glideslope antenna. The keel was
> >>    already down when I got the kit.
> >>    I assume the transponder would be best on the floor, and the gps on
> >>    the ceiling.
> >>    What about something for the am/fm?
> >>    I've seen Don's elt antenna on the main wingspar shearweb, and it
> >>    looked pretty survivable.
> >>
> >>    What's popular / what's practical
> >>
> >>    Noel 3suv103
> >>
> >>
> >
> >
> >
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