---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 11/20/12: 3 ---------------------------------------------------------- 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 _____________________________________ Time: 01:52:10 PM PST US Subject: AeroElectric-List: OT but electron related, I hate it when that happens! From: William Curtis 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" > > > 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 _____________________________________ Time: 03:35:57 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 04:54:37 PM PST US From: "Chris" Subject: RE: AeroElectric-List: 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 --> 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.