Transponder Ant. was Re: REFLECTOR:anntenas
Ronnie Brown
reflector@tvbf.org
Sat, 12 Apr 2003 08:32:55 -0400
This is a new capability included in Garmin's 330 Transponders. See
http://www.garmin.com/products/gtx330/
There are some articles in the latest issue of Flying magazine. The TIS is
uplinked data from some of the newer ATC systems that provides traffic as
seen by their radar systems. A great low cost alterative to the Ryan TCAD
systems.
I read an article (but can't remember where it was) about UPSAT's Capstone
project in Alaska that referred to the capability to receive the FAA TIS
(FAA Traffic Information Services) including location, direction, altitude,
and climb/descent information of nearby aircraft. See
http://www.upsat.com/uat_datalink_air.shtml
Ronnie
----- Original Message -----
From: "Fred Marconi" <fmarconi@bellsouth.net>
To: <reflector@tvbf.org>
Sent: Saturday, April 12, 2003 4:52 AM
Subject: Re: Transponder Ant. was Re: REFLECTOR:anntenas
> Chris:
>
> I have a similar set up as you, except that I have the UPS transponder
mode
> C. Do we now have the ability to pick up the traffic around us through
our
> transponder antennas, so we do not need and additional pick up system?
> Clue me in please. I'm not flying yet but I am getting there.
>
> Fred
>
> ----- Original Message -----
> From: " Chris Martin" <christophercmartin@earthlink.net>
> To: <reflector@tvbf.org>; <reflector@tvbf.org>
> Sent: Friday, April 11, 2003 8:12 PM
> Subject: RE: Transponder Ant. was Re: REFLECTOR:anntenas
>
>
> > Scott,
> >
> > I also had a transponder mounted inside of the outside strake. Poor
> > reception by ATC. I moved it to the floor of the fuselage underneath the
> > retract gear and offset to the co-pilot side. I used a small 3"
> Transponder
> > antenna mounted on a 8" square aluminum plate. The antenna pokes through
a
> > hole in the floor of the fuselage and the backing plate is attached to
the
> > floor with 2 pop rivets. The cable attaches with a B & C connector. This
> is
> > the only antenna I have that is visible outside the plane. Only 2"
> actually
> > is visible. The ATC has no problem seeing this antenna transmission,
> really
> > excellent results. I recentally added the Garmen GTX 330 Mode S
> Transponder
> > with TIS (Traffic Information Service). This displays traffic on my
Garmin
> > 430 moving map. I can recieve the TIS information within 500 feet of the
> > ground. So, this new antenna is not only transmitting well but is
> receiving
> > well.
> >
> > For those of you that live in a high traffic area, (I live in one of the
> > busyest, Los Angeles). This TIS information is a wonderful aid. I
strongly
> > recomend it.
> >
> > Chris Martin
> > Velocity XL RG
> >
> >
> > > [Original Message]
> > > From: Scott Derrick <scott@tnstaafl.net>
> > > To: <reflector@tvbf.org>
> > > Date: 4/11/2003 5:36:05 AM
> > > 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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> >
> >
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>
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