Transponder Ant. was Re: REFLECTOR:anntenas
Fred Marconi
reflector@tvbf.org
Sat, 12 Apr 2003 12:43:53 -0400
Thanks Chris:
The sexy voice sold me. Technology is getting better and better for us. I
have the full UPS stack, I will have to talk to them. Grrrrrr!!!!! What
next?
Fred
----- Original Message -----
From: " Chris Martin" <christophercmartin@earthlink.net>
To: <reflector@tvbf.org>; <reflector@tvbf.org>
Sent: Saturday, April 12, 2003 8:26 AM
Subject: Re: Transponder Ant. was Re: REFLECTOR:anntenas
> Fred,
>
> The new Mode S transponder that is made by Garmin both transmits and
> receives. As far as I know it's is currently the only one that does. When
> it transmits it broadcasts both the transponder code, pressure altitude
and
> your N number. When it receives it reads from the radar signal an embedded
> data stream of information. The data contains location, speed, altitude,
> course and rate of vertical speed of all traffic. That information is
> passed over to the Garmin 430 or 530 and is displayed on the moving map.
It
> shows up to 8 traffic targets in your area. THe indication on the moving
> map shows an open diamond for non alert traffic with a 2 digit number for
> hundreds of feet of separation. It also shows either an up or down arrow
> for a ascending or descending target along with a vector line showing
> target course. If the computer detects that there is a possible collision
> between your aircraft vector and one of the targets, then that target is
> depicted as a yellow solid circle. It also annunciates with a sexy female
> voice, "Traffic" and automatically switches your display to a page showing
> the traffic.
>
> I'm unsure of this being offered by UPS. Currently Garmin is the only one
> offering the information. And, the information is only displayed in
certain
> locations in the USA. The locations do correspond with the areas with the
> highest traffic. For me, it is available in most all of the Southern
> California area that I fly. Last week I went to Mexico and the service
> drooped off about 10 miles below the Mexican border.
>
> Chris
>
>
> > [Original Message]
> > From: Fred Marconi <fmarconi@bellsouth.net>
> > To: <reflector@tvbf.org>
> > Date: 4/12/2003 1:09:11 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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> >
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>
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