---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 01/22/07: 13 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:51 AM - Re: Jack plug question (Miskelly, Francis G) 2. 05:09 AM - Re: Timer module (Greg Campbell) 3. 05:23 AM - Re: Timer module (Matt Jurotich) 4. 06:09 AM - Re: Starting Points (corrected as promised) (Robert L. Nuckolls, III) 5. 06:13 AM - Re: Re: Jack plug question (Robert L. Nuckolls, III) 6. 06:36 AM - Re: Timer module (Robert L. Nuckolls, III) 7. 07:12 AM - Re: Re: Jack plug question (Miskelly, Francis G) 8. 01:08 PM - bump (Bill Boyd) 9. 01:14 PM - OT Question for Bob (pilot4pay) 10. 02:26 PM - jabiru coil grounds (bob noffs) 11. 04:19 PM - Re: jabiru coil grounds (Robert L. Nuckolls, III) 12. 04:19 PM - Re: OT Question for Bob (Robert L. Nuckolls, III) 13. 06:50 PM - a couple of specific wiring questions (Bill Boyd) ________________________________ Message 1 _____________________________________ Time: 01:51:33 AM PST US Subject: AeroElectric-List: RE: Jack plug question From: "Miskelly, Francis G" Re-posting question more accurately I have a King KX155 in a Glastar - composite aircraft with fibreglass panel To hear other stations i have the radio turned up full and there's lots of radio interference. When i pull out the microphone jack plug (leaving the headphone jack in) the volume increases substantially (maybe 30%) and i have to turn down the volume. The radio interference is much less. When i push the microphone jack plug back in the volume diminishes and the static noise reappears Can someone explain this? Many thanks Frank ________________________________ Message 2 _____________________________________ Time: 05:09:06 AM PST US From: "Greg Campbell" Subject: Re: AeroElectric-List: Timer module I went to Home Depot and got a wind up timer switch for $9. It weighs 4.1 oz and is rated for 20A @ 125 Vac or a 1HP motor. They sell a 0-60 minute version and a 0-12 hour version. It's a little bulky behind the panel, but the knob on the front is small, sturdy, and intuitive. You wind it up and you've got lights for 0 to 60 minutes. It even has an audible reminder that the courtesy lights are on! (It goes "ticka-ticka-ticka" ;-) I found a piece of "nearly useless" panel space near the upper left of my panel that had very little room behind it and was otherwise hard to get to - but it's perfect for the timer. It's easy to reach immediately after opening the door at night to start a preflight. It also makes a decent backup light & timer. I like the high tech stuff too, but this low tech "turn past 10" gizmo filled the bill nicely for under $10. Greg ________________________________ Message 3 _____________________________________ Time: 05:23:58 AM PST US From: Matt Jurotich Subject: Re: AeroElectric-List: Timer module Bob Could you put the schematic and a parts list for the on-limit timer in a more readable format. I am having difficulty reading some of the parts and have to make assumptions such as the left most caps are 0.1 mircrofarrads and and V1A is same part as V1B and V1C and there is a floating symbol that does not make sense to me. Thanks Matthew M. Jurotich e-mail mail to: phone : 301-286-5919 ________________________________ Message 4 _____________________________________ Time: 06:09:27 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Starting Points (corrected as promised) Thanks for the heads up. Fixed this and some other link problems. The fixed version has been posted. Bob . . . At 09:47 PM 1/21/2007 -0600, you wrote: > > >Hmmm, updated in 2008? I didn't think I slept THAT long... :-D Earl ________________________________ Message 5 _____________________________________ Time: 06:13:34 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: RE: Jack plug question At 09:44 AM 1/22/2007 +0000, you wrote: >Re-posting question more accurately >I have a King KX155 in a Glastar - composite aircraft with fibreglass panel >To hear other stations i have the radio turned up full and there's lots of >radio interference. When i pull out the microphone jack plug (leaving the >headphone jack in) the volume increases substantially (maybe 30%) and i >have to turn down the volume. The radio interference is much less. When i >push the microphone jack plug back in the volume diminishes and the static >noise reappears > >Can someone explain this? I'm at a loss to deduce something I could purposely do to create the problem you describe. Obviously, there either a wiring problem or some form of failure in the equipment . . . but I'd have to put my hands on it and do some investigative experiments to sort this one out. Has it always done this or is the condition new? Bob . . . ________________________________ Message 6 _____________________________________ Time: 06:36:59 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Timer module At 08:21 AM 1/22/2007 -0500, you wrote: > > >Bob > >Could you put the schematic and a parts list for the on-limit timer in a >more readable format. I am having difficulty reading some of the parts >and have to make assumptions such as the left most caps are 0.1 >mircrofarrads and and V1A is same part as V1B and V1C and there is a >floating symbol that does not make sense to me. Look up the CD4093 integrated circuit. It has 4 sections of which only three are used and the forth is "tied off". The caps are either 0.1 uF and 10 uF except the timing cap which may be 10 to 47 uF set by experiment to achieve desired time delay. The resistors are 1K, 100 ohms, 470 ohms, and 100K except for the time-adjust resistor which you'll have to experiment with to achieve the desired time delay. Bob . . . --------------------------------------------------------- < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss > --------------------------------------------------------- ________________________________ Message 7 _____________________________________ Time: 07:12:19 AM PST US Subject: RE: AeroElectric-List: RE: Jack plug question From: "Miskelly, Francis G" Thanks Bob. The KX155 is 6 months old. This problem has been there from the beginning. It came with harness pre-wired and i installed it. Sometimes i use a handheld (ICOM A20) wired into the a/c power supply and aerial and there's some ignition noise but not a serious problem. Its just the panel mounted KX155. The microphone jack interferes with the volume (even with the squelch turned off) and introduces interference Two possibles i thought of were 1. The microphone socket may need an earth? The panel is fibreglass and the socket has 2 wires running into it but is not earthed to the airframe 2. Could the wires in the microphone socket be transposed? As the ICOM works OK that seems to exclude power supply or aerial issues? Very grateful for your advice. Frank ________________________________ From: owner-aeroelectric-list-server@matronics.com on behalf of Robert L. Nuckolls, III Sent: Mon 22/01/2007 14:13 Subject: Re: AeroElectric-List: RE: Jack plug question At 09:44 AM 1/22/2007 +0000, you wrote: >Re-posting question more accurately >I have a King KX155 in a Glastar - composite aircraft with fibreglass panel >To hear other stations i have the radio turned up full and there's lots of >radio interference. When i pull out the microphone jack plug (leaving the >headphone jack in) the volume increases substantially (maybe 30%) and i >have to turn down the volume. The radio interference is much less. When i >push the microphone jack plug back in the volume diminishes and the static >noise reappears > >Can someone explain this? I'm at a loss to deduce something I could purposely do to create the problem you describe. Obviously, there either a wiring problem or some form of failure in the equipment . . . but I'd have to put my hands on it and do some investigative experiments to sort this one out. Has it always done this or is the condition new? Bob . . . ________________________________ Message 8 _____________________________________ Time: 01:08:06 PM PST US From: "Bill Boyd" Subject: AeroElectric-List: bump Forgive my impatience, Bob; I'd like to bump to the top of the pile two recent inquiries I submitted over the weekend. I am ready to pull wire on these systems tonight, but I'd like to hear your thoughts on the inrush current limiter idea and the wiring gauge/protection for the SD-8 battery lead. Waiting to hear something before I head to the shop :-) -Bill B ________________________________ Message 9 _____________________________________ Time: 01:14:13 PM PST US Subject: AeroElectric-List: OT Question for Bob From: "pilot4pay" I noticed that you mention you taught at Great Lakes. I took "Beep" and FT "A" there in '79. Any chance we crossed paths? Were you civie or service? I remember the "Nukes Clock" in the "Beep" admin office that ran backwards real fast, any chance you had somethng to do with that? Always gave me a chuckle. [Laughing] Craig Smith Do not archive -------- Craig Smith Future CH640 builder Read this topic online here: http://forums.matronics.com/viewtopic.php?p=89587#89587 ________________________________ Message 10 ____________________________________ Time: 02:26:53 PM PST US From: "bob noffs" Subject: AeroElectric-List: jabiru coil grounds hi bob, i asked this question a week ago but got no response so i will try again. this refers to the z-20 wiring diagram for a jab engine and ''note #3'' i understand a shielded wire connects the coil to the ignition switch and when the switch is turned ''off'' the coil is grounded . i am using a keyed switch like is used in a piper. i see that the shielding is grounded at the engine. here comes the question.......... it seems that the opposite end of the shielding is attached to the ''ground'' terminal of my switch. so the switch receives it's ground thru the shielding . am i correct? the switch does not need a wire from the ''forest of tabs'' ground because it is using the shielding for ground. correct? if i am correct in these observations my last question is ''why is this done like this? why not use another wire to ground the switch and leave the ''switch end'' of the shielding unattached? i appreciate your patience. this elect. stuff is hard enough for me when i DO understand the reasons. bob noffs ________________________________ Message 11 ____________________________________ Time: 04:19:01 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: jabiru coil grounds At 04:23 PM 1/22/2007 -0600, you wrote: >hi bob, > i asked this question a week ago but got no response so i will try > again. this refers to the z-20 wiring diagram for a jab engine and ''note #3'' > i understand a shielded wire connects the coil to the ignition switch > and when the switch is turned ''off'' the coil is grounded . i am using a > keyed switch like is used in a piper. > i see that the shielding is grounded at the engine. > here comes the question.......... it seems that the opposite end of the > shielding is attached to the ''ground'' terminal of my switch. so the > switch receives it's ground thru the shielding . am i correct? the > switch does not need a wire from the ''forest of tabs'' ground because it > is using the shielding for ground. correct? Yes > > if i am correct in these observations my last question is ''why is > this done like this? why not use another wire to ground the switch and > leave the ''switch end'' of the shielding unattached? > i appreciate your patience. this elect. stuff is hard enough for me > when i DO understand the reasons. You don't want MULTIPLE ground conductors bringing the crankcase to the airframe. Grounding the shielding of p-leads at both ends does just that. Multiple ground paths are the root cause of ground-loop induced noises and in this case offers the potential for damaging a p-lead conductor and other wires bundled with it should (1) the bond strap between crankcase and firewall stud become disconnected and (2) an attempt is made to start the engine. Had a mechanic do it twice on me . . . didn't offer him a third opportunity. Bob . . . --------------------------------------------------------- < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss > --------------------------------------------------------- ________________________________ Message 12 ____________________________________ Time: 04:19:56 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: OT Question for Bob At 01:11 PM 1/22/2007 -0800, you wrote: > > >I noticed that you mention you taught at Great Lakes. I took "Beep" and FT >"A" there in '79. Any chance we crossed paths? Were you civie or service? >I remember the "Nukes Clock" in the "Beep" admin office that ran backwards >real fast, any chance you had somethng to do with that? Always gave me a >chuckle. [Laughing] > >Craig Smith I taught in the last 8-weeks of a 26 week course which I believe was "ET-C" school. I was a contract instructor for H.L. Yoh Company through the spring and summer of '64 so I guess that was a tad before your tenure there. Bob . . . ________________________________ Message 13 ____________________________________ Time: 06:50:33 PM PST US From: "Bill Boyd" Subject: AeroElectric-List: a couple of specific wiring questions First, I want to make sure I'm okay using a D-sub connector to carry flap motor loads in an RV. I think 16 AWG is recommended for the motor wiring; will a single D-sub pin carry the current, or should I double-up on pins? Second, there is a wide range of recommendations and practice regarding the B-lead wiring for the SD-8 alternator. The Z 13/8 diagram shows 12 AWG for this run; the documents from B&C show 14 AWG, yet the wire they supply (potted into the regulator) is 16 AWG. Given that these critters can only do about 10A flat-out, are we sizing for voltage drop concerns here? It's not just academic: I can fuselink-protect a 16 AWG wire, maybe even a 14 AAWG one, but above that it means buying ANL's. Besides, there's the 2-gram weight difference to obsess over ;-) -Bill B ------------------------------------------------------------------------------------- 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.