Today's Message Index:
----------------------
1. 01:12 AM - Re: John Deere Dynamo Generator (jetboy)
2. 07:10 AM - Re: DYNON EMS Log (Jim McBurney)
3. 09:25 AM - Re: Re: Firewall penetration (Ken)
4. 11:18 AM - Z-13/8 question (Lincoln Keill)
5. 11:22 AM - Re: DYNON EMS Log (John Cleary)
6. 02:26 PM - Re: Z Diagram Questions (jayb)
7. 02:40 PM - Re: Z Diagram Questions (jayb)
8. 03:38 PM - Wireless Thermometers (FLAGSTONE)
9. 03:53 PM - Radio Noise Chevy V8 installation (Mike Kimball)
10. 05:12 PM - Re: Radio Noise Chevy V8 installation (Matt Prather)
11. 05:13 PM - Re: Wireless Thermometers (Matt Prather)
12. 05:32 PM - Re: Radio Noise Chevy V8 installation (Mike Kimball)
13. 05:42 PM - Re: Re: Firewall penetration (Bill Schlatterer)
14. 06:07 PM - Re: Re: Firewall penetration (Joemotis@aol.com)
15. 06:40 PM - Re: Radio Noise Chevy V8 installation (Matt Prather)
16. 09:16 PM - Re: Radio Noise Chevy V8 installation (n801bh@netzero.com)
Message 1
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| Subject: | Re: John Deere Dynamo Generator |
I've seen a similar unit fitted to a VW conversion, it was a Kubota small tractor
part. (same part as for J.Deere but less cost) They are good for 8 amps or
so, but not as smooth as a 3 phase alternator - they come with a simple but robust
regulator which is adequate.
B&C make a similar unit and regulator. I guess as a backup you want to run it off
a seperate belt.
Ralph
Do Not Archive
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=161519#161519
Message 2
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| Subject: | Re: DYNON EMS Log |
Try searching for "WAITERS FLIGHT DATA RECORDER". Pretty slick freeware.
Jim
CH-801
DeltaHawk diesel
Augusta GA
90% done, 90% left
Message 3
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| Subject: | Re: Firewall penetration |
FWIW I ran everything including starter fat wire through the same
opening which is a hardware store steel towel rack/grab bar elbow. It
really doesn't matter if an engine sensor is misreading a bit during
cranking. At idle on the ground I can hear a bit of electronic ignition
noise from one ignition. No alternator noise at all so I'd do it again.
I don't have mags.
Ken
>
>
>> Be aware of possible impact on engine sensor data if sensor leads are too
>> close to high current (fat) wires.
>> Dale Ensing
>>
>
>
> Hadn't thought of this. I had planned on running my main bus and e-bus feed lines
through this pass through (along with all engine sensors). No really fat
wires (like starter or B-lead) but would there be enough current here for me to
need to make a separate penetration to keep these wires separate?
>
> Really appreciate all the input so far. If I actually do need to make 2 more
penetrations then maybe this is worthwhile ($7 vs $100).
>
> Thanks,
>
> --------
> Jim McChesney
> Tucson, AZ
> RV-7A Finishing Kit
Message 4
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I'm planning on initially equipping my RV-7 for day/night VFR flight with one magneto
and one Lightspeed electronic ignition, turn coordinator, one VHF radio
and transponder. Once I get comfortable in the airplane (and the budget allows),
I plan on buying all the goodies to make her an IFR bird and re-doing the
panel with a GNS-430 and Dynon D-100 (or similar).
Bob describes the Z-13/8 architecture as "dual-layer" so my plan was to build
the "Z-13" part of the system initially and leave the "/8" part of it out until
I get to the point where my bank account and experience allow me to make her
IFR. It looks like everything on the "/8" side of the system is in front of
the firewall (except for the wires running to the "AUX ALT" switch and the additional
loadmeter/ammeter) so I'm thinking this is a good plan. By buying big
enough fuse blocks for future expension and sizing the main alternator appropriately,
it seems doable. Anyone ever do this, think about doing it or have
advice one way or the other? Please feel free to shoot holes in my thinking.
I did a search on the site but came up empty. Thanks.
Lincoln Keill
Message 5
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Jim,
This search led me to the FlyEZ site - what a great site.
Thank you,
John Cleary
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jim
McBurney
Sent: Friday, 1 February 2008 2:03 AM
Subject: Re: AeroElectric-List: DYNON EMS Log
<jmcburney@pobox.com>
Try searching for "WAITERS FLIGHT DATA RECORDER". Pretty slick freeware.
Jim
CH-801
DeltaHawk diesel
Augusta GA
90% done, 90% left
9:29 AM
9:29 AM
Message 6
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| Subject: | Re: Z Diagram Questions |
f you have a vacuum pump pad open, an 8A
alternator is a whole lot lighter than
a second 17 a.h. battery, has indefinite
service life and unlimited energy for
continued flight.
>> I do have one and I will consider this option.
Z-19 is for electrically dependent automotive
conversions that CANNOT have a second alternator.
>> That's fairly obvious once you understand what ECU and EFI acronyms mean...
However, the diagram nicely showed a rear battery mount just like the RV10 requires
(it's nose heavy). I had a lot of confusion until someone pointed out to
me that, in general, Z diagrams were written from the view point of airplanes
that use front-mounted batteries. It's not always easy to tell which is which
as "RB" only appears in the -19 as far as it could see.
Z-13/8 can be used with ANY combination of ignition
systems. For the lightest weight, lowest cost of ownership
and highest reliability, Z-13/8 with one battery is your
best choice.
>> I agree in principle that this would be the best choice. However - I spoke with
the P-Mag guys and the 6 cylinder version is -not- a shipping product (or
anytime soon either). Since vaporware isn't a good power source, I'll build my
electrical system to not preclude this as a future upgrade.
A Lancair IVP with full up IFR panel both
sides and intended to be used in a manner that
pushes the comfort zone for all weather flight.
Since that drawing was published, I've had only
3 or 4 readers who were building that kind of
airplane with that kind of mission.
>> Maybe, but I'm willing to bet there are more than a couple of RV10 builders
considering this route. Are you guys out there lurking? :-)
Look at the specs for an ANL published at:
http://www.aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/Bussman/ANL_Specs.pdf
>> Thanks. It's a bit overwhelming how many documents are available. I'm not complaining
as it's better to know the information must be out there than to simply
"guess" and be sorry later!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=161665#161665
Message 7
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| Subject: | Re: Z Diagram Questions |
One more question... The Z-19RB battery location is the same as for the RV-10.
Do you see any real advantage of running a #2AWG ground forward to the forest
of tab in a metal airplane rather than grounding locally? There's plenty of conduit
space space in my fuse, but would rather save the weight as #2 is pretty
heavy. I'm planning on running #2AWG forward to the starter...
Thanks,
Jay
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=161668#161668
Message 8
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| Subject: | Wireless Thermometers |
Hi:
Does anyone know if using a wireless thermometer or temperature probe in
your plane causes any problems whatsoever while flying.
Thanks
Mark
Message 9
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| Subject: | Radio Noise Chevy V8 installation |
I have just joined the list today although I have made good use of the
AeroElectric website for a long time. I have probably the 3000th radio
noise question for the list but mine might be more uncommon due to my
uncommon installation. I have a Chevy V8 on a Murphy Super Rebel, using an
MSD dual electronic ignition system. Two ignition modules, two coils, one
dual pickup distributor, one set of unshielded ignition wires and resistor
plugs. There is a switch in the cockpit for choosing one system or the
other which basically just switches modules and coils. I have the following
avionics which were professionally prewired for me so all I had to do was
hook up power, ground and antenna wires.
Garmin 340 Audio Panel
King KX-165 Nav/Com
King 76C Transponder
Centruy NSD360A non-slaved HSI
My battery is grounded in the back directly to the airframe. I have a
grounding block on the firewall where all of the avionics are grounded,
along with most other things although one ignition module is grounded to the
firewall in a different location. The grounding block on the firewall is
directly connected to the engine block with a large gauge cable. I have
filters on the alternator but the alternator is not the source. (I ran the
engine with the alternator solonoid switch open and the alternator drive
belt removed. Still have the same noise.) I detect no noise from the
stobes. The radio power wire is filtered. I used RG-142/400 antenna wire.
The noise is present with or without the audio panel/intercom. I made sure
none of the headset jacks were grounding to the airframe and the noise is
present in all jacks. The noise is much worse on the NAV side unless there
is voice on the NAV frequency, then the noise is about the same. The comm
antenna is on the cabin top and the nav antenna is on top of the vertical
stab. The noise changes in pitch with engine RPM. It's a sort of whine
with static. My transmissions are reported by the tower as loud and clear.
The ignition modules are mounted inside the cockpit, one on each sidewall
just behind the firewall. I can only see this as the source if I have a
compromise in both the comm and nav antenna wires or coax connectors that
are nearby. I wouldn't put it past me to screw up more than one coax
connector but I was pretty careful installing them on the wires. Someone
told me that I might try disconnecting the NAV/COMM ground wire because it
might be grounded through the mounting tray and the additional ground might
set up a loop. I haven't tried that yet. I remember reading about making
sure the antenna itself was grounded but I think I remember a cork gasket
that went under it before mounting to the airframe. Might there be a
problem with the way I mounted the comm and nav antennas themselves? If the
problem is radiated from the coils, ignition wires, or distributor I'm
screwed. Shielding those will be a huge problem.
Any suggestions would be greatly appreciated.
Mike Kimball
Message 10
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| Subject: | Re: Radio Noise Chevy V8 installation |
Hi Mike,
Are you using (have you tried) spiral wound wires? I am running an old
LSE ignition on my O-200 powered Varieze. This model of LSE has an MSD
amplifier and a pair of MSD coils. When I installed the system I made
custom length Moroso spiral core wires connected to Nippon Denso
(resistor) plugs.
The electronic ignition is _very_ quiet compared to the magneto.
Disconnect the antenna leads from the back of the radio. If the noise is
gone, the propagation mode is radiated...
I have heard of people having noise problems when using solid core wires.
Regards,
Matt-
> I have just joined the list today although I have made good use of the
> AeroElectric website for a long time. I have probably the 3000th radio
> noise question for the list but mine might be more uncommon due to my
> uncommon installation. I have a Chevy V8 on a Murphy Super Rebel, using
> an
> MSD dual electronic ignition system. Two ignition modules, two coils, one
> dual pickup distributor, one set of unshielded ignition wires and resistor
> plugs. There is a switch in the cockpit for choosing one system or the
> other which basically just switches modules and coils. I have the
> following
> avionics which were professionally prewired for me so all I had to do was
> hook up power, ground and antenna wires.
>
> Garmin 340 Audio Panel
> King KX-165 Nav/Com
> King 76C Transponder
> Centruy NSD360A non-slaved HSI
>
> My battery is grounded in the back directly to the airframe. I have a
> grounding block on the firewall where all of the avionics are grounded,
> along with most other things although one ignition module is grounded to
> the
> firewall in a different location. The grounding block on the firewall is
> directly connected to the engine block with a large gauge cable. I have
> filters on the alternator but the alternator is not the source. (I ran
> the
> engine with the alternator solonoid switch open and the alternator drive
> belt removed. Still have the same noise.) I detect no noise from the
> stobes. The radio power wire is filtered. I used RG-142/400 antenna
> wire.
> The noise is present with or without the audio panel/intercom. I made
> sure
> none of the headset jacks were grounding to the airframe and the noise is
> present in all jacks. The noise is much worse on the NAV side unless
> there
> is voice on the NAV frequency, then the noise is about the same. The comm
> antenna is on the cabin top and the nav antenna is on top of the vertical
> stab. The noise changes in pitch with engine RPM. It's a sort of whine
> with static. My transmissions are reported by the tower as loud and
> clear.
>
> The ignition modules are mounted inside the cockpit, one on each sidewall
> just behind the firewall. I can only see this as the source if I have a
> compromise in both the comm and nav antenna wires or coax connectors that
> are nearby. I wouldn't put it past me to screw up more than one coax
> connector but I was pretty careful installing them on the wires. Someone
> told me that I might try disconnecting the NAV/COMM ground wire because it
> might be grounded through the mounting tray and the additional ground
> might
> set up a loop. I haven't tried that yet. I remember reading about making
> sure the antenna itself was grounded but I think I remember a cork gasket
> that went under it before mounting to the airframe. Might there be a
> problem with the way I mounted the comm and nav antennas themselves? If
> the
> problem is radiated from the coils, ignition wires, or distributor I'm
> screwed. Shielding those will be a huge problem.
>
> Any suggestions would be greatly appreciated.
>
> Mike Kimball
>
Message 11
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| Subject: | Re: Wireless Thermometers |
I doubt it would be a problem. I think they are using low power 433MHz
transceivers which isn't really near any aircraft system. I might do a
fairly careful study before I planned to fly the plane with a coupled
autopilot in the clouds if I had such a probe in the airplane - just to be
sure.
Something like this?
http://www.weatherconnection.com/product.asp?itmky=24075
Regards,
Matt-
> Hi:
>
> Does anyone know if using a wireless thermometer or temperature probe in
> your plane causes any problems whatsoever while flying.
>
> Thanks
>
>
> Mark
Message 12
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| Subject: | Radio Noise Chevy V8 installation |
Taylor 409 spiral wound wires. Supposed to be very good wires and good for
noise suppression. I'm pretty sure I did check the noise with the antenna
disconnected and the noise is gone. I'll recheck that when it warms up (-25
F today and the near future here in Fairbanks, AK and the plane is outside)
That's why I am interested in possible antenna mounting issues. Thanks.
Keep the suggestions coming.
Mike
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Matt
Prather
Sent: Thursday, January 31, 2008 4:05 PM
Subject: Re: AeroElectric-List: Radio Noise Chevy V8 installation
Hi Mike,
Are you using (have you tried) spiral wound wires? I am running an old
LSE ignition on my O-200 powered Varieze. This model of LSE has an MSD
amplifier and a pair of MSD coils. When I installed the system I made
custom length Moroso spiral core wires connected to Nippon Denso
(resistor) plugs.
The electronic ignition is _very_ quiet compared to the magneto.
Disconnect the antenna leads from the back of the radio. If the noise is
gone, the propagation mode is radiated...
I have heard of people having noise problems when using solid core wires.
Regards,
Matt-
> I have just joined the list today although I have made good use of the
> AeroElectric website for a long time. I have probably the 3000th radio
> noise question for the list but mine might be more uncommon due to my
> uncommon installation. I have a Chevy V8 on a Murphy Super Rebel, using
> an
> MSD dual electronic ignition system. Two ignition modules, two coils, one
> dual pickup distributor, one set of unshielded ignition wires and resistor
> plugs. There is a switch in the cockpit for choosing one system or the
> other which basically just switches modules and coils. I have the
> following
> avionics which were professionally prewired for me so all I had to do was
> hook up power, ground and antenna wires.
>
> Garmin 340 Audio Panel
> King KX-165 Nav/Com
> King 76C Transponder
> Centruy NSD360A non-slaved HSI
>
> My battery is grounded in the back directly to the airframe. I have a
> grounding block on the firewall where all of the avionics are grounded,
> along with most other things although one ignition module is grounded to
> the
> firewall in a different location. The grounding block on the firewall is
> directly connected to the engine block with a large gauge cable. I have
> filters on the alternator but the alternator is not the source. (I ran
> the
> engine with the alternator solonoid switch open and the alternator drive
> belt removed. Still have the same noise.) I detect no noise from the
> stobes. The radio power wire is filtered. I used RG-142/400 antenna
> wire.
> The noise is present with or without the audio panel/intercom. I made
> sure
> none of the headset jacks were grounding to the airframe and the noise is
> present in all jacks. The noise is much worse on the NAV side unless
> there
> is voice on the NAV frequency, then the noise is about the same. The comm
> antenna is on the cabin top and the nav antenna is on top of the vertical
> stab. The noise changes in pitch with engine RPM. It's a sort of whine
> with static. My transmissions are reported by the tower as loud and
> clear.
>
> The ignition modules are mounted inside the cockpit, one on each sidewall
> just behind the firewall. I can only see this as the source if I have a
> compromise in both the comm and nav antenna wires or coax connectors that
> are nearby. I wouldn't put it past me to screw up more than one coax
> connector but I was pretty careful installing them on the wires. Someone
> told me that I might try disconnecting the NAV/COMM ground wire because it
> might be grounded through the mounting tray and the additional ground
> might
> set up a loop. I haven't tried that yet. I remember reading about making
> sure the antenna itself was grounded but I think I remember a cork gasket
> that went under it before mounting to the airframe. Might there be a
> problem with the way I mounted the comm and nav antennas themselves? If
> the
> problem is radiated from the coils, ignition wires, or distributor I'm
> screwed. Shielding those will be a huge problem.
>
> Any suggestions would be greatly appreciated.
>
> Mike Kimball
>
Message 13
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| Subject: | Re: Firewall penetration |
Just FWIW, I posted a similar firewall penetration a couple years ago using
the cheap pot metal electrical connectors shown in the attachment. I was
cautioned to AVOID any of the fittings that were made of cast steel
compounds (gray looking pot metal material) because they would actually burn
very well under modest flame. Was told to ONLY use the steel tube/forged
fittings which were much more expensive but would not burn.
I did not put a torch on them to find out but thought I might mention it.
Pictures of the rejected fittings attached.
Just what I was told on this list back then.
Bill S
7a
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ken
Sent: Thursday, January 31, 2008 8:52 AM
Subject: Re: AeroElectric-List: Re: Firewall penetration
FWIW I ran everything including starter fat wire through the same opening
which is a hardware store steel towel rack/grab bar elbow. It really doesn't
matter if an engine sensor is misreading a bit during cranking. At idle on
the ground I can hear a bit of electronic ignition noise from one ignition.
No alternator noise at all so I'd do it again.
I don't have mags.
Ken
>
>
>> Be aware of possible impact on engine sensor data if sensor leads are
>> too close to high current (fat) wires.
>> Dale Ensing
>>
>
>
> Hadn't thought of this. I had planned on running my main bus and e-bus
feed lines through this pass through (along with all engine sensors). No
really fat wires (like starter or B-lead) but would there be enough current
here for me to need to make a separate penetration to keep these wires
separate?
>
> Really appreciate all the input so far. If I actually do need to make 2
more penetrations then maybe this is worthwhile ($7 vs $100).
>
> Thanks,
>
> --------
> Jim McChesney
> Tucson, AZ
> RV-7A Finishing Kit
Message 14
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| Subject: | Re: Firewall penetration |
Those connectors are made from ZAMAC and have a melting point of around 750
degrees. You can melt them in a saucepan on a gas cooktop.
Joe Motis
Do not archive
**************Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
Message 15
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| Subject: | Radio Noise Chevy V8 installation |
Sounds fine..
What kind of fuel delivery do you have? Carb or FI?
-25F? That's just silly. :)
Matt-
>
> Taylor 409 spiral wound wires. Supposed to be very good wires and good
> for
> noise suppression. I'm pretty sure I did check the noise with the antenna
> disconnected and the noise is gone. I'll recheck that when it warms up
> (-25
> F today and the near future here in Fairbanks, AK and the plane is
> outside)
> That's why I am interested in possible antenna mounting issues. Thanks.
> Keep the suggestions coming.
>
> Mike
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Matt
> Prather
> Sent: Thursday, January 31, 2008 4:05 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Radio Noise Chevy V8 installation
>
> <mprather@spro.net>
>
> Hi Mike,
>
> Are you using (have you tried) spiral wound wires? I am running an old
> LSE ignition on my O-200 powered Varieze. This model of LSE has an MSD
> amplifier and a pair of MSD coils. When I installed the system I made
> custom length Moroso spiral core wires connected to Nippon Denso
> (resistor) plugs.
>
> The electronic ignition is _very_ quiet compared to the magneto.
>
> Disconnect the antenna leads from the back of the radio. If the noise is
> gone, the propagation mode is radiated...
>
> I have heard of people having noise problems when using solid core wires.
>
>
> Regards,
>
> Matt-
>
>
>> I have just joined the list today although I have made good use of the
>> AeroElectric website for a long time. I have probably the 3000th radio
>> noise question for the list but mine might be more uncommon due to my
>> uncommon installation. I have a Chevy V8 on a Murphy Super Rebel, using
>> an
>> MSD dual electronic ignition system. Two ignition modules, two coils,
>> one
>> dual pickup distributor, one set of unshielded ignition wires and
>> resistor
>> plugs. There is a switch in the cockpit for choosing one system or the
>> other which basically just switches modules and coils. I have the
>> following
>> avionics which were professionally prewired for me so all I had to do
>> was
>> hook up power, ground and antenna wires.
>>
>> Garmin 340 Audio Panel
>> King KX-165 Nav/Com
>> King 76C Transponder
>> Centruy NSD360A non-slaved HSI
>>
>> My battery is grounded in the back directly to the airframe. I have a
>> grounding block on the firewall where all of the avionics are grounded,
>> along with most other things although one ignition module is grounded to
>> the
>> firewall in a different location. The grounding block on the firewall
>> is
>> directly connected to the engine block with a large gauge cable. I have
>> filters on the alternator but the alternator is not the source. (I ran
>> the
>> engine with the alternator solonoid switch open and the alternator drive
>> belt removed. Still have the same noise.) I detect no noise from the
>> stobes. The radio power wire is filtered. I used RG-142/400 antenna
>> wire.
>> The noise is present with or without the audio panel/intercom. I made
>> sure
>> none of the headset jacks were grounding to the airframe and the noise
>> is
>> present in all jacks. The noise is much worse on the NAV side unless
>> there
>> is voice on the NAV frequency, then the noise is about the same. The
>> comm
>> antenna is on the cabin top and the nav antenna is on top of the
>> vertical
>> stab. The noise changes in pitch with engine RPM. It's a sort of whine
>> with static. My transmissions are reported by the tower as loud and
>> clear.
>>
>> The ignition modules are mounted inside the cockpit, one on each
>> sidewall
>> just behind the firewall. I can only see this as the source if I have a
>> compromise in both the comm and nav antenna wires or coax connectors
>> that
>> are nearby. I wouldn't put it past me to screw up more than one coax
>> connector but I was pretty careful installing them on the wires.
>> Someone
>> told me that I might try disconnecting the NAV/COMM ground wire because
>> it
>> might be grounded through the mounting tray and the additional ground
>> might
>> set up a loop. I haven't tried that yet. I remember reading about
>> making
>> sure the antenna itself was grounded but I think I remember a cork
>> gasket
>> that went under it before mounting to the airframe. Might there be a
>> problem with the way I mounted the comm and nav antennas themselves? If
>> the
>> problem is radiated from the coils, ignition wires, or distributor I'm
>> screwed. Shielding those will be a huge problem.
>>
>> Any suggestions would be greatly appreciated.
>>
>> Mike Kimball
>>
>
>
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| Subject: | Re: Radio Noise Chevy V8 installation |
Hi Mike. I have almost the exact same set up as yours, altho mine is a s
troker 347 all aluminum Ford. Both my ignition boxes are on the outside
of the firewall along side the coil switcher. I did use the high dollar
blue max racing ignition wires and I have no noise in any of my radios
or intercom. My gut feeling is the noise is in the wires, You can go to
my website and browse through the pics and see how mine is set up.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- Mike Kimball <mkimball@gci.net> wrote:
I have just joined the list today although I have made good use of the A
eroElectric website for a long time. I have probably the 3000th radio n
oise question for the list but mine might be more uncommon due to my unc
ommon installation. I have a Chevy V8 on a Murphy Super Rebel, using an
MSD dual electronic ignition system. Two ignition modules, two coils,
one dual pickup distributor, one set of unshielded ignition wires and re
sistor plugs. There is a switch in the cockpit for choosing one system
or the other which basically just switches modules and coils. I have th
e following avionics which were professionally prewired for me so all I
had to do was hook up power, ground and antenna wires.<?xml:namespace pr
efix = o ns = "urn:schemas-microsoft-com:office:office" />
Garmin 340 Audio Panel
King KX-165 Nav/Com
King 76C Transponder
Centruy NSD360A non-slaved HSI
My battery is grounded in the back directly to the airframe. I have a g
rounding block on the firewall where all of the avionics are grounded, a
long with most other things although one ignition module is grounded to
the firewall in a different location. The grounding block on the firewa
ll is directly connected to the engine block with a large gauge cable.
I have filters on the alternator but the alternator is not the source.
(I ran the engine with the alternator solonoid switch open and the alter
nator drive belt removed. Still have the same noise.) I detect no nois
e from the stobes. The radio power wire is filtered. I used RG-142/400
antenna wire. The noise is present with or without the audio panel/int
ercom. I made sure none of the headset jacks were grounding to the airf
rame and the noise is present in all jacks. The noise is much worse on
the NAV side unless there is voice on the NAV frequency, then the noise
is about the same. The comm antenna is on the cabin top and the nav ant
enna is on top of the vertical stab. The noise changes in pitch with en
gine RPM. It=92s a sort of whine with static. My transmissions are rep
orted by the tower as loud and clear.
The ignition modules are mounted inside the cockpit, one on each sidewal
l just behind the firewall. I can only see this as the source if I have
a compromise in both the comm and nav antenna wires or coax connectors
that are nearby. I wouldn=92t put it past me to screw up more than one
coax connector but I was pretty careful installing them on the wires. S
omeone told me that I might try disconnecting the NAV/COMM ground wire b
ecause it might be grounded through the mounting tray and the additional
ground might set up a loop. I haven=92t tried that yet. I remember re
ading about making sure the antenna itself was grounded but I think I re
member a cork gasket that went under it before mounting to the airframe.
Might there be a problem with the way I mounted the comm and nav anten
nas themselves? If the problem is radiated from the coils, ignition wir
es, or distributor I=92m screwed. Shielding those will be a huge proble
m.
Any suggestions would be greatly appreciated.
Mike Kimball
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