Today's Message Index:
----------------------
1. 01:52 PM - OT but electron related, I hate it when that happens! (William Curtis)
2. 03:35 PM - Re: HF antenna issues (Robert L. Nuckolls, III)
3. 04:54 PM - Re: HF antenna issues (Chris)
Message 1
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Subject: | OT but electron related, I hate it when that happens! |
Eric,
You probably have a setting in you Adobe Acrobat viewer that is supressing
the hyperlinks. I have listed them below however.
30 Amp Regulated Switching Power Supply ($30)
http://www.ebay.com/itm/New-12V-DC-30A-360W-Regulated-Switching-Power-Supply-for-LED-Strip-Light-/180852147612
12 Position Fuse Panel With Grounding Pad ($20-$25)
http://www.ebay.com/itm/ATC-ATO-12-Position-Fuse-Panel-Grounding-Pad-/330831959769
Sears U1 Battery (02827199000) ($35)
http://www.sears.com/shc/s/p_10153_12605_02827199000P?mv=rr&i_cntr=1313694317693
120 VAC RELAY, DPDT 12 AMPS ($1.75)
http://www.allelectronics.com/make-a-store/item/RLY-453/120-VAC-RELAY-DPDT-12-AMPS/1.html
DC Power Jack 2.1mm Panel Mount (10 for $3.50)
http://www.ebay.com/itm/10pc-2-1mm-DC-Power-Jack-Socket-Panel-Mount-Connector-top-quality-/261117327193
Analog Current Panel Meter DC 30A (85C1)
http://www.amazon.com/Analog-Current-Panel-Meter-Ammeter/dp/B0050GIN2Q
> Time: 09:27:36 AM PST US
> Subject: AeroElectric-List: Re: OT but electron related, I hate it when
> that happens!
> From: "eschlanser" <eschlanser@yahoo.com>
>
>
> William,
> The links don't work for me.
> Eric
>
> --------------------------------------------------------------------------
>
> Schematic in pdf format with active links to products used:
> http://wcurtis.nerv10.com/ehome/homedc.pdf (
> http://wcurtis.nerv10.com/ehome/homedc.pdf)
> --
William
RV10 - 40237 - http://wcurtis.nerv10.com/
Message 2
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Subject: | Re: HF antenna issues |
At 04:22 PM 11/19/2012, you wrote:
>Bob and all.
>I'm trying to insulate an aircraft's wiring from the rfi/emi effects
>of an HF antenna in a fibreglass Long-EZs wing. A counterpoise to
>the antenna will lie in the opposite wing.
>
>I had thought of using a grounded (?) copper conduit for all the
>wing wiring ... fuel tank capacitance gauge/strobe and navigation
>lighting/vhf nav-com cables, but with an output of 100W I am worried
>that the in-wing HF antenna will set up a field that will still cause issues.
There's a VERY high probability for that condition.
Keeping HF out of the electro-whizzies on a metal
airplane can be a challenge. There's no hard-and-
fast rules for an installation that's not first
researched in the lab and then vetted over a series
of successful field installations.
The question to be asked first is, so it interferes
with SOME things. Does this interference create a
hazard? So gauges don't read right while your talking
but are okay when you're listening.
A/P servos trying to turn the airplane upside down
are problematic. You'd attack that problem with shielding
and filtering local to the actuator.
>There is still the case of using a common ground for the existing
>wiring and the new radio causing problems.
>
>Any thoughts on a suitable insulator or solution to this?
It's not an issue of 'grounding' but of the potential
susceptibility of all the victims to stresses they
were never qualified for. Conduits and special grounds
are of limited if any value. Suggest you get it all installed
and then attack each critical condition one-at-a-time.
Bob . . .
Message 3
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Subject: | HF antenna issues |
This is somewhat timely. Here is my setup...
RV-10
Garmin stack from top to bottom: G430, SL30, GTX327, GMA340, trutrak A/P
To the left is 2 GRT HX screens with GRT EIS underneath and switches all
along the bottom of panel.
I have only recently installed the SL30 - wiring was all there just didn't
have the unit in the tray yet.
SL30 uses Archer wingtip antenna, 430 uses bent whip on belly.
RG400 runs from units to antennas
I was in the cockpit with engine off learning the new SL30. I had the entire
panel powered up. I noticed while transmitting over the SL30 my fuel
pressure would rise from zero to about 50 psi if I held the push to talk. I
tried the 430 today and it also responds but about half as bad and I had
never noticed it before, it had never caused the FP to exceed limits so I
did not notice it in flight.
I have flown with the SL30 and when transmitting it sends the FP up enough
to exceed the limit (35) which annoyingly gets my attention.
The FP sender wires pass near the SL30 antenna wire so today I separated
them but that only helped a little, or did it??. When I unhook the antenna
wire from the SL30 pigtail and transmit there is no effect - when I use the
copilot push to talk I get the same effects.
The FP sender gets power from the EIS 12V output not direct ship power,
grounds at forest of tabs and third wire inputs to EIS.
I am doing the conditional after a year of flying and have put off some
gripes, so I have planned to spend some time on things
Any ideas on how to limit this interference?
Thanks
Chris Lucas
RV-10
N919AR
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Tuesday, November 20, 2012 6:35 PM
Subject: Re: AeroElectric-List: HF antenna issues
--> <nuckolls.bob@aeroelectric.com>
At 04:22 PM 11/19/2012, you wrote:
>Bob and all.
>I'm trying to insulate an aircraft's wiring from the rfi/emi effects of
>an HF antenna in a fibreglass Long-EZs wing. A counterpoise to the
>antenna will lie in the opposite wing.
>
>I had thought of using a grounded (?) copper conduit for all the wing
>wiring ... fuel tank capacitance gauge/strobe and navigation
>lighting/vhf nav-com cables, but with an output of 100W I am worried
>that the in-wing HF antenna will set up a field that will still cause
issues.
There's a VERY high probability for that condition.
Keeping HF out of the electro-whizzies on a metal
airplane can be a challenge. There's no hard-and-
fast rules for an installation that's not first
researched in the lab and then vetted over a series
of successful field installations.
The question to be asked first is, so it interferes
with SOME things. Does this interference create a
hazard? So gauges don't read right while your talking
but are okay when you're listening.
A/P servos trying to turn the airplane upside down
are problematic. You'd attack that problem with shielding
and filtering local to the actuator.
>There is still the case of using a common ground for the existing
>wiring and the new radio causing problems.
>
>Any thoughts on a suitable insulator or solution to this?
It's not an issue of 'grounding' but of the potential
susceptibility of all the victims to stresses they
were never qualified for. Conduits and special grounds
are of limited if any value. Suggest you get it all installed
and then attack each critical condition one-at-a-time.
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