Today's Message Index:
----------------------
1. 04:21 AM - lacing tape (bob noffs)
2. 06:38 AM - Re: Transponder Radio Noise? (Roger Lee)
3. 06:52 AM - Re: Transponder Radio Noise? (darinh)
4. 06:55 AM - Re: lacing tape (kerrjohna@comcast.net)
5. 07:20 AM - Re: Transponder Radio Noise? (Noel)
6. 09:11 AM - Re: Transponder Radio Noise? (Lowell Fitt)
7. 10:43 AM - Re: lacing tape (Lynn Matteson)
8. 11:44 AM - Re: Re: Transponder Radio Noise? (Roger Standley)
9. 12:13 PM - Re: lacing tape (Lowell Fitt)
10. 03:38 PM - Re: lacing tape (Noel)
11. 03:49 PM - Re: Re: Transponder Radio Noise? (Noel)
12. 06:22 PM - Engine mount (Lowell Fitt)
13. 07:23 PM - Re: Engine mount (Noel)
14. 08:06 PM - Re: lacing tape (bob noffs)
15. 08:34 PM - Re: Transponder Radio Noise? (darinh)
16. 11:40 PM - Re: Transponder Radio Noise? (Michel Verheughe)
Message 1
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hi all,
i decided to use ''lacing tape'' from acs for wirjng my wood wings. i will
put a wrap of silocon tape on the wire first, then attach. price of lacing
tape was reasonable so i have plenty to replace the plastic tie wraps in the
engine compartment if they dont take the heat. thanks for all the input.
bob noffs
Message 2
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| Subject: | Re: Transponder Radio Noise? |
Hi Darin,
I have the same annoying little buzz from the transponder being interrogated. It
goes off if I turn off the radio or the transponder or the intercom. The intercom
Mfg. thinks it is coming through one of the antenna wires in the plane,
but I didn't have it for almost two years then it just showed up. I have checked
the wires and have not been able to make it go away yet. I'm still looking.
I'll let you know if I find out what is causing it.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243382#243382
Message 3
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| Subject: | Re: Transponder Radio Noise? |
Roger, I will do the same if I find the problem. I suspect I either have a ground
loop problem, or that it is coming from one of the cables. I am going to
check the connectors again for good ground on both ends. So far I have only checked
ground on the antenna side. Tracing RF noise seem a bit akin to catching
ghosts...actually catching a ghost might be a bit easier! good luck
--------
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243385#243385
Message 4
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F16's and my Hatz Classic has the same method of securing wire bundles.
John Kerr=C2-
Kitfox Classic, 912ul
784 hours GLC
----- Original Message -----
From: "bob noffs" <icubob@gmail.com>
Sent: Sunday, May 10, 2009 5:20:08 AM GMT -07:00 US/Canada Mountain
Subject: Kitfox-List: lacing tape
hi all,
=C2-i decided to use ''lacing tape'' from acs for wirjng my wood wings. i
will put a wrap of silocon tape on the wire first, then attach. price of l
acing tape was reasonable so i have plenty to replace the plastic tie wraps
in the engine compartment if they dont take the heat. thanks for all the i
nput.
=C2-bob noffs
==
Message 5
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| Subject: | Transponder Radio Noise? |
What you are hearing is your transponders reply to the interrogation... not
the interrogation itself. Assuming that at one time you did not get this
buzz then something has changed. If this is the case ferrite beads and
rings may not help you.
What ai would look at first is where the antenna for the transponder
attaches to the plane. This is a location outside the plane where a little
corrosion is more than possible. Remove the antenna and make sure the base
of the antenna, the surface under it and the braid attachment are all nice
and shiny.
I suspect you have a high SWR on that antenna. This results in the
transmitter section of the Xpndr trying to pump more power into the antenna.
That in turn could with a little time cause you to lose your Xpndr RF power
transistors. The extra power drain and load on the transmitting transistors
cause the spurious emissions you are hearing in your headset.
This may be a place where the best thing to do, if you can't track it down,
may be to get an avionics shop do an SWR test on your antenna system.
Noel
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of darinh
Sent: 10 May 2009 02:37 AM
Subject: Kitfox-List: Transponder Radio Noise?
I've got a question for any of you that know more about avionics than I
do...which is everyone. I have noticed that whenever my transponder is
interrogated I get a little short buzz in my headset. It is not major but
enough to really bug me. I know it is from the transponder because I hear
the noise at the exact second the little "R" for receive lights up on the
readout. I can also set it to "Standby" and the noise stops. I have
checked all my grounds including to the antenna and they seem to be good
(checked with ohm meter for continuity). Anyone have any ideas what could
be the problem?
Also, I have read a couple of times about the snap together ferrite rings
you can buy to reduce noise. Anyone every used any of these and are there
and rules of thumb about how to use them (i.e. on the power wire of a
device, signal wire, etc.)?
--------
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243367#243367
Message 6
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| Subject: | Re: Transponder Radio Noise? |
Darin,
Another thing you might try is to check all wire runs. My understanding is
that all antenna cables should be run independent of each other and other
wires. If the coax has to cross another wire, try to make the crossing
angle as close to 90 as possible.
Lowell
----- Original Message -----
From: "darinh" <gerns25@netscape.net>
Sent: Saturday, May 09, 2009 10:07 PM
Subject: Kitfox-List: Transponder Radio Noise?
>
> I've got a question for any of you that know more about avionics than I
> do...which is everyone. I have noticed that whenever my transponder is
> interrogated I get a little short buzz in my headset. It is not major but
> enough to really bug me. I know it is from the transponder because I hear
> the noise at the exact second the little "R" for receive lights up on the
> readout. I can also set it to "Standby" and the noise stops. I have
> checked all my grounds including to the antenna and they seem to be good
> (checked with ohm meter for continuity). Anyone have any ideas what could
> be the problem?
>
> Also, I have read a couple of times about the snap together ferrite rings
> you can buy to reduce noise. Anyone every used any of these and are there
> and rules of thumb about how to use them (i.e. on the power wire of a
> device, signal wire, etc.)?
>
> --------
> Darin Hawkes
> Series 7
> 914 Turbo
> Kaysville, Utah
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=243367#243367
>
>
>
Message 7
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Are you sure you want to subject lacing tape to the heat of the
engine compartment? I would test this tape under the same heat
conditions as under the cowl, before I committed to using it. The tie
wraps that I used...nothing special....hold up perfectly on my plane.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 647.4 hrs
Sensenich 62x46 Wood prop
Electroair direct-fire ignition system
Status: flying
On May 10, 2009, at 7:20 AM, bob noffs wrote:
> hi all,
> i decided to use ''lacing tape'' from acs for wirjng my wood
> wings. i will put a wrap of silocon tape on the wire first, then
> attach. price of lacing tape was reasonable so i have plenty to
> replace the plastic tie wraps in the engine compartment if they
> dont take the heat. thanks for all the input.
> bob noffs
> www.matronics.com/contribution _-
> ===========================================================
Message 8
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| Subject: | Re: Transponder Radio Noise? |
Hi,
Yes, I have the same thing, didn't have it for five years and just
started showing up one day. I tried reseating the transponder in its
rack and that seemed to help for a few days. Now it just comes and goes
with no particular pattern that I have been able to correlate. Also,
when it is making its buzz, ATC has said that they are not seeing my
transponder. When there is no buzz, ATC is happy.
Roger
----- Original Message -----
From: Roger Lee<mailto:ssadiver1@yahoo.com>
To: kitfox-list@matronics.com<mailto:kitfox-list@matronics.com>
Sent: Sunday, May 10, 2009 6:37 AM
Subject: Kitfox-List: Re: Transponder Radio Noise?
<ssadiver1@yahoo.com<mailto:ssadiver1@yahoo.com>>
Hi Darin,
I have the same annoying little buzz from the transponder being
interrogated. It goes off if I turn off the radio or the transponder or
the intercom. The intercom Mfg. thinks it is coming through one of the
antenna wires in the plane, but I didn't have it for almost two years
then it just showed up. I have checked the wires and have not been able
to make it go away yet. I'm still looking. I'll let you know if I find
out what is causing it.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243382#243382<http://forums
.matronics.com/viewtopic.php?p=243382#243382>
http://www.matronics.com/Navigator?Kitfox-List<http://www.matronics.com/N
avigator?Kitfox-List>
http://www.matronics.com/contribution<http://www.matronics.com/contributi
on>
Message 9
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Lynn,
The lacing tape I used is polyester. We shrink our covering fabric to 350.
I would sure hope that the wiring in the engine compartment won't get to
350. At the temperatures that would degrade the polyester, I think I would
be more concerned about the fuel lines.
Lowell
----- Original Message -----
From: "Lynn Matteson" <lynnmatt@jps.net>
Sent: Sunday, May 10, 2009 10:40 AM
Subject: Re: Kitfox-List: lacing tape
>
> Are you sure you want to subject lacing tape to the heat of the engine
> compartment? I would test this tape under the same heat conditions as
> under the cowl, before I committed to using it. The tie wraps that I
> used...nothing special....hold up perfectly on my plane.
>
> Lynn Matteson
> Kitfox IV Speedster, taildragger
> Jabiru 2200, #2062, 647.4 hrs
> Sensenich 62x46 Wood prop
> Electroair direct-fire ignition system
> Status: flying
>
>
> On May 10, 2009, at 7:20 AM, bob noffs wrote:
>
>> hi all,
>> i decided to use ''lacing tape'' from acs for wirjng my wood wings. i
>> will put a wrap of silocon tape on the wire first, then attach. price of
>> lacing tape was reasonable so i have plenty to replace the plastic tie
>> wraps in the engine compartment if they dont take the heat. thanks for
>> all the input.
>> bob noffs
>> www.matronics.com/contribution _-
>> ===========================================================
>
>
>
Message 10
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While I don't like using tie wraps any where a person may be reaching into
they are far ahead of any adhesive unless you are planning on tying the
tapes as well. You need something mechanically sound both in the engine
compartment and in the wings. Mechanically sound means tie wraps or good
solid knots not any adhesive tape.
Noel
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lynn Matteson
Sent: 10 May 2009 03:11 PM
Subject: Re: Kitfox-List: lacing tape
Are you sure you want to subject lacing tape to the heat of the
engine compartment? I would test this tape under the same heat
conditions as under the cowl, before I committed to using it. The tie
wraps that I used...nothing special....hold up perfectly on my plane.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 647.4 hrs
Sensenich 62x46 Wood prop
Electroair direct-fire ignition system
Status: flying
On May 10, 2009, at 7:20 AM, bob noffs wrote:
> hi all,
> i decided to use ''lacing tape'' from acs for wirjng my wood
> wings. i will put a wrap of silocon tape on the wire first, then
> attach. price of lacing tape was reasonable so i have plenty to
> replace the plastic tie wraps in the engine compartment if they
> dont take the heat. thanks for all the input.
> bob noffs
> www.matronics.com/contribution _-
> ===========================================================
Message 11
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| Subject: | Re: Transponder Radio Noise? |
Roger:
In your case disconnect the antenna cable at both ends and first do a
continuity check of the centre conductor of the coax. Be sure to wiggle the
wire while you are doing the test. If it passes that test Gently tug on the
end of the centre conductor from both ends. Do this to make sure the centre
conductor hasn't broken a couple of centimeters ( inches) inside the cable.
You will not have to pull on the centre conductor very hard to have it come
out of the cable if it is already broken. While you are at it make sure the
connection to the exterior of the 256 connector is good the easiest way of
checking that is by doing a continuity check on the outside of the coax
connectors.
Noel
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Roger Standley
Sent: 10 May 2009 04:10 PM
Subject: Re: Kitfox-List: Re: Transponder Radio Noise?
Hi,
Yes, I have the same thing, didn't have it for five years and just started
showing up one day. I tried reseating the transponder in its rack and that
seemed to help for a few days. Now it just comes and goes with no particular
pattern that I have been able to correlate. Also, when it is making its
buzz, ATC has said that they are not seeing my transponder. When there is no
buzz, ATC is happy.
Roger
----- Original Message -----
From: Roger Lee <mailto:ssadiver1@yahoo.com>
Sent: Sunday, May 10, 2009 6:37 AM
Subject: Kitfox-List: Re: Transponder Radio Noise?
Hi Darin,
I have the same annoying little buzz from the transponder being
interrogated. It goes off if I turn off the radio or the transponder or the
intercom. The intercom Mfg. thinks it is coming through one of the antenna
wires in the plane, but I didn't have it for almost two years then it just
showed up. I have checked the wires and have not been able to make it go
away yet. I'm still looking. I'll let you know if I find out what is causing
it.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243382#243382
<Bnbsp; Features Chat, http://www.matronnbsp;
<http://www.matronics.com/Navigator?Kitfox-List> via the Web
title=http://forums.matronics.com/
href="http://forums.matronics.com">http://forums.matronics.com
_p; generous bsp;
title=http://www.matronics.com/contribution
href="http://www.matronics.com/contribution">http://www.matronics.com/c====
===========
Message 12
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There is an engine mount on Barnstormers that is reported to be for a Rotax
912 series to Kitfox Model IV. I don't recognize the mount and I have been
having trouble getting more than three word responses from the guy selling
it.
Does anyone recognize this mount? It is the firewall portion that fit's the
Rotax Ring mount?
Lowell
Message 13
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Lowell it took a little while to find it but it looks nothing at all like
the dynafocal mount I just put in my plane. John Mc Bean said it was the
same attach points at the model III and IV.
Noel
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell Fitt
Sent: 10 May 2009 10:49 PM
Subject: Kitfox-List: Engine mount
There is an engine mount on Barnstormers that is reported to be for a Rotax
912 series to Kitfox Model IV. I don't recognize the mount and I have been
having trouble getting more than three word responses from the guy selling
it.
Does anyone recognize this mount? It is the firewall portion that fit's the
Rotax Ring mount?
Lowell
Message 14
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i believe the tape from acs was nylon. good or bad?
bob noffs
On Sun, May 10, 2009 at 8:08 PM, Noel <noelloveys@yahoo.ca> wrote:
>
> While I don't like using tie wraps any where a person may be reaching into
> they are far ahead of any adhesive unless you are planning on tying the
> tapes as well. You need something mechanically sound both in the engine
> compartment and in the wings. Mechanically sound means tie wraps or good
> solid knots not any adhesive tape.
>
> Noel
>
> -----Original Message-----
> From: owner-kitfox-list-server@matronics.com
> [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lynn Matteson
> Sent: 10 May 2009 03:11 PM
> To: kitfox-list@matronics.com
> Subject: Re: Kitfox-List: lacing tape
>
>
> Are you sure you want to subject lacing tape to the heat of the
> engine compartment? I would test this tape under the same heat
> conditions as under the cowl, before I committed to using it. The tie
> wraps that I used...nothing special....hold up perfectly on my plane.
>
> Lynn Matteson
> Kitfox IV Speedster, taildragger
> Jabiru 2200, #2062, 647.4 hrs
> Sensenich 62x46 Wood prop
> Electroair direct-fire ignition system
> Status: flying
>
>
> On May 10, 2009, at 7:20 AM, bob noffs wrote:
>
> > hi all,
> > i decided to use ''lacing tape'' from acs for wirjng my wood
> > wings. i will put a wrap of silocon tape on the wire first, then
> > attach. price of lacing tape was reasonable so i have plenty to
> > replace the plastic tie wraps in the engine compartment if they
> > dont take the heat. thanks for all the input.
> > bob noffs
> > www.matronics.com/contribution _-
> > ===========================================================
>
>
Message 15
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| Subject: | Re: Transponder Radio Noise? |
Noel, What is SWR? I told you I am not an avionics guru so some of these acronyms
are not familiar to me. By the way, the plane is virtually brand new and
there is not corrosion. I did remove the antenna and checked anyway and even
sanded and brightened up the metal again. There is good ground between the airframe
and the antenna and I have had this problem since day one. I have pretty
much ignored it to this point as the buzz is not really noticeable while flying
due to cabin noise and ATC has never said anything about it so I don't think
they hear it. I think I will try the ferrite option as it is inexpensive
and easy.
Here is the question though...Where should I attach the ferrite cores? On the
antenna side or the Tx side? Or should I put them on both the radio and the Tx?
Lowell, I ran all my power, grounds and other wires on the Right side of the fuse...the
Tx cable is in the center and the radio cable is on the left side.
--------
Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243493#243493
Message 16
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| Subject: | Re: Transponder Radio Noise? |
> From: darinh [gerns25@netscape.net]
> Noel, What is SWR?
Allow me, please.
A Standing Wave Ratio meter is a simple intrument with two dials that you connect
between your transceiver and your antenna via the coaxial cable. It has two
dials. The first one shows the energy going out to the antenna and the second,
the energy coming back.
The aim is to have as much as possible energy out and as little as possible coming
back bacause, in the worst-case-out it may even grill your output amplification
circuit.
An antenna is supposed to shoot out electromagnetic energy and it does that best
when in harmony, i.e. when one end is at the peak positive, the other end of
the antenna should be at the peak negative of the alternative current. This is
why antenna are always as long as the wave length or a fraction of it.
Antenna are weird things and you can never be sure that they work to the best until
you have seen their efficiency with a SWR meter. Perhaps your antenna is
very close to your tail and the tube of your tail works as a reflector. They are
many things that may affect it. At sea, I used to have my isolated backstay
as an antenna that tuned with ... a tuner, which is a set of condensers and coils
that "balance" the antenna. But still, when I wanted to have good reception
from the south (sailing in Norway means that ... the rest of the world is at
the south! :-) I turned the boat heading north. Something to do with my aluminium
mast that was in the way, I guess.
Cheers,
Michel Verheughe
Norway
Kitfox 3 - Jabiru 2200 .... flying as PAX
Do not archive
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