---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 05/21/05: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:30 AM - Re: Fat Wire Terminals on Starter Contactor (LarryRobertHelming) 2. 05:31 AM - HSI Operations () 3. 06:25 AM - Re: HF meters (Robert L. Nuckolls, III) 4. 06:36 AM - GPS I/O shielding (Ken Simmons) 5. 09:12 AM - Re: GPS I/O shielding (rv-9a-online) 6. 08:56 PM - Auslaenderpolitik (bob.nuckolls@cox.net) ________________________________ Message 1 _____________________________________ Time: 04:30:32 AM PST US From: "LarryRobertHelming" Subject: Re: AeroElectric-List: Fat Wire Terminals on Starter Contactor --> AeroElectric-List message posted by: "LarryRobertHelming" > --> AeroElectric-List message posted by: "r falstad" > > I'm starting to wire my GlaStar. I plan on terminating the 2 AWG from the battery + and the 6 AWG from the alternator + to the same post on the starter contactor. I also need to terminate the wire from the power bus somewhere and the closest place that will see the battery is the same post on the starter contactor. Is this right? ((Right.)) That will put three fairly large terminals on one post. Don't you need a rubber terminal nipple to cover the terminals and post so if anything gets loose in the engine compartment, you don't run the risk of a direct short to ground? ((Yes you do want to insulate that.)) How do you insulate that arrangement? ((You do what ever you do to do. Try silicone tape or get a large termminal nipple and cut a slit in it so it will fit and secure it with a tie wrap and/or silicone tape.)) > > Best regards, > > Bob > ((Best wishes, Indiana Larry, RV7 Tip Up It Flies "The American Republic will endure until the day Congress discovers that it can bribe the public with the public's own money." Alexis de Toqueville)) ________________________________ Message 2 _____________________________________ Time: 05:31:56 AM PST US From: Subject: AeroElectric-List: HSI Operations --> AeroElectric-List message posted by: 5/21/2005 Hello Don, Now this has really gotten below the level of "who cares", but since you insist I'll parse your original comment on my input just a bit. I know that you think that you said it clearly and that you think you said the same thing that I quoted, but a reader can be mislead by your original input. To whit: 1) <> Not true for three reasons: A) The needle on the HSI does not initially point at the transmitter on its own. It is positioned on the compass card by the pilot rotating the needle to make a course setting. Depending upon the aircraft location and heading after course selection the needle may not be pointing anywhere near the localizer transmitter (antenna). B) Then while flying inbound on the front course region of the localizer antenna pattern the only time the needle will actually be pointing at the transmitter is when the aircraft is on the localizer center line. If the aircraft is off the centerline then the needle is pointing off in space either to the left or right of the antenna location. A more accurate statement for the front course would be to say that the needle setting should be on the desired inbound course and pointing in the general direction of the transmitter. C) When the aircraft is inbound towards the runway and the antenna location while flying in the back course region of the localizer antenna pattern the needle is definitely not pointed at the transmitter. Instead it is pointed towards the rear of the aircraft because the pilot has set in the front course inbound couse as required by the instructions that I quoted. An accurate statement for the back couse operation would be that the needle setting is the front course setting and the needle will be pointing in the opposite direction of the transmitter. 2) << When you are in the backcourse it points behind the ac nose........skip.......>> I am not sure that everyone would know where "behind the ac nose" is. When a person is sitting in the cockpit he could easily think that "behind the ac nose" is in front of him. Do you see now how a reader, particularly one not intimately familiar with HSI operations (probably the majority of aeroelectri-list readers), could be misled or confused by the wording in your input? OC AeroElectric-List message previously posted by: "DonVS" <> AeroElectric-List message previously posted by: dsvs@comcast.net <> 5/20/2005 Hello Don, This subject probably falls below the level of "who cares", but since we are trying to clarify things please let me add a bit of clarification to your input above. Rather than parse your input I'll just quote from the printed instruction for the KI-525A HSI: "When tuned to a localizer frequency, the course select pointer MUST be set to the inbound front course for BOTH the front and back-course approaches to retain this pictorial presentation." (their emphasis) The pictorial presentation they are referring to is the one where the airplane is flown towards the course deviation bar in order to get to the localizer centerline. OC ________________________________ Message 3 _____________________________________ Time: 06:25:55 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: HF meters --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 08:00 PM 5/20/2005 -0700, you wrote: >--> AeroElectric-List message posted by: "Leo Corbalis" > > >The sun finally came out today. I rounded up 3 small HF digital meters and >my 2 other large meters. I hooked them all to a 9 volt battery. Set all to >20 volts. I put the 3 small ones in the sun for 5 minutes. then I switched >the board around putting the 2 big meters in the sun. I kept the battery in >the shade. All readings held steady and fully legible. > >Leo Corbalis A fine repeatable experiment sir. Thank you. Bob . . . ________________________________ Message 4 _____________________________________ Time: 06:36:01 AM PST US From: "Ken Simmons" Subject: AeroElectric-List: GPS I/O shielding --> AeroElectric-List message posted by: "Ken Simmons" For everyone that helped with the intercom wiring/shielding questions, I finally did get it all wired up and it worked great on the first go. I haven't started the engine yet, but the strobes don't add any noise. The next question is on GPS I/O. I'm installing a Trutrak AP and possibly a fuel totalizer. The Trutrak harness from Steinair has a unshielded wire for the GPS input. The fuel totalizer, bought used, also had unshielded wires for the GPS input/output. The drawing for the GPS shows these wires shielded. The fuel totalizer obviously worked without shielded wires and I can't imagine Steinair making something that wouldn't work properly. Is Garmin indicating shielding just for CYA purposes? For such short distances and a digital signal, I don't see how it will make much difference unless I was trying to shield against EMP. Thanks. Ken DO NOT ARCHIVE ________________________________ Message 5 _____________________________________ Time: 09:12:35 AM PST US From: rv-9a-online Subject: Re: AeroElectric-List: GPS I/O shielding --> AeroElectric-List message posted by: rv-9a-online The reason for shielding these signals is to protect other wires from the electrical noise generated by the serial data signals. The serial data signals themselves are reasonably tolerant of outside interference... but that is installation dependent. It's not likely to be a problem if you are just connecting locally on your panel. Having said that, it is good practice to use shielded cable whenever a signal is sensitive to electrical noise (audio signals) or is a generator of electrical noise (p-leads). In the spirit of too much information, many of the 'RS-232' signals used in an aircraft are not true RS-232 levels. For example, hand-held GPSs put low-voltage signals out. Generally, modern avionics will tolerate these signals quite happily... but they are less tolerant to electrical interference, and I would never run them off-panel or close to large disturbers (I'm not talking about your right seat passenger here). Vern Little, RV-9A Ken Simmons wrote: >--> AeroElectric-List message posted by: "Ken Simmons" > >For everyone that helped with the intercom wiring/shielding questions, I finally did get it all wired up and it worked great on the first go. I haven't started the engine yet, but the strobes don't add any noise. > >The next question is on GPS I/O. I'm installing a Trutrak AP and possibly a fuel totalizer. The Trutrak harness from Steinair has a unshielded wire for the GPS input. The fuel totalizer, bought used, also had unshielded wires for the GPS input/output. The drawing for the GPS shows these wires shielded. > >The fuel totalizer obviously worked without shielded wires and I can't imagine Steinair making something that wouldn't work properly. Is Garmin indicating shielding just for CYA purposes? For such short distances and a digital signal, I don't see how it will make much difference unless I was trying to shield against EMP. > >Thanks. >Ken > >DO NOT ARCHIVE > > > > > > > ________________________________ Message 6 _____________________________________ Time: 08:56:44 PM PST US From: bob.nuckolls@cox.net Subject: AeroElectric-List: Auslaenderpolitik --> AeroElectric-List message posted by: bob.nuckolls@cox.net Lese selbst: http://www.mjoelnirsseite.de/2100.htm