---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 12/16/12: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:16 AM - Re: SL30 intercom function (user9253) 2. 07:29 AM - Re: SL30 intercom function (Roger & Jean Curtis) 3. 08:05 AM - Re: Re: Removable comm antenna (D L Josephson) 4. 08:05 AM - Re: Re: SL30 intercom function (Charlie England) 5. 09:03 AM - Re: Re: Removable comm antenna (Robert L. Nuckolls, III) 6. 10:24 AM - Re: Re: Removable comm antenna (Holger Selover-Stephan) 7. 10:39 AM - Re: Re: Removable comm antenna (BobsV35B@aol.com) 8. 11:10 AM - AeroElectric Connection Seminar Brodhead, WI, April 13-14, 2013 (Robert L. Nuckolls, III) 9. 12:03 PM - Re: SL30 intercom function (user9253) 10. 04:23 PM - LARAGO ELT info needed (Charlie England) ________________________________ Message 1 _____________________________________ Time: 07:16:28 AM PST US Subject: AeroElectric-List: Re: SL30 intercom function From: "user9253" Looking at the schematic for the AMX-4A/4B referenced above. http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf I do not understand the resistor value 180R *100K. The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms by 100,000, it comes to 18,000,000, which seems too big. I understand other resistor values on the schematic. For instance, 1M6 is 1.6M ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused. Joe Gores -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=390524#390524 ________________________________ Message 2 _____________________________________ Time: 07:29:50 AM PST US From: "Roger & Jean Curtis" Subject: RE: AeroElectric-List: SL30 intercom function >Do you know if the intercom input can be on (grounded) continuously, even >during txm? I think it can Thanks Bob Roger Do not Archive ________________________________ Message 3 _____________________________________ Time: 08:05:40 AM PST US From: D L Josephson Subject: AeroElectric-List: Re: Re: Removable comm antenna > Bob, many thanks for explaining it in detail. With your suggestions in > mind, I picked up some parts I had laying around and put this together: > https://www.dropbox.com/sh/rylqm9cect5ndut/XyaFh-jLE2 > > I'll have to find someone with an SWR meter and cut it to the proper > length. Then we'll see if it actually does what it's supposed to do. But > it's solid, and removed in seconds. Holger, that looks fine. If everyone were as able to deal with a small machining project like that as you are, there wouldn't be so many lashed-up antennas out there. An SWR check will be useful but don't be too worried about it. You should expect better than 2:1 over a range of a few MHz. Trim the length so the center of this range is the center of the range of frequencies you normally use. ________________________________ Message 4 _____________________________________ Time: 08:05:40 AM PST US From: Charlie England Subject: Re: AeroElectric-List: Re: SL30 intercom function On 12/16/2012 09:15 AM, user9253 wrote: > > Looking at the schematic for the AMX-4A/4B referenced above. > http://107.22.231.30/redmine/attachments/download/58/Schematic-AMX-4A.pdf > I do not understand the resistor value 180R *100K. > The first thought that comes to mind is 180K ohm. But if you multiply 180 ohms by 100,000, it comes to 18,000,000, which seems too big. > I understand other resistor values on the schematic. For instance, 1M6 is 1.6M ohms. And 560R is 560 ohms. But 180R *100K and 1K0 *150R have me confused. > Joe Gores > > -------- > Joe Gores Only a quick look at it, but I think that he's showing two optional values for a set of resistors. One set of values is for 'normal' output (AMX-4A) & the other, asterisk labeled, is for high output (AMX-4B). The 'normal' output resistor set is actually an attenuator. Charlie ________________________________ Message 5 _____________________________________ Time: 09:03:17 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Removable comm antenna > >Bob, many thanks for explaining it in detail. With your suggestions >in mind, I picked up some parts I had laying around and put this >together: https://www.dropbox.com/sh/rylqm9cect5ndut/XyaFh-jLE2 > >I'll have to find someone with an SWR meter and cut it to the proper >length. Then we'll see if it actually does what it's supposed to do. >But it's solid, and removed in seconds. Nice work! I'd like to add your photos to the archives on aeroelectric.com. Help me out a bit . . . Emacs! It appears that your coax center conductor is attached to the 4-bolt flange (pop rivet?)] which in turn is insulated from the mounting bolts with a combination of insulating bushings and washers. Where does the coax shield find connection to the groundplane/skin? It's not clear how the antenna element is retained on the aircraft/ As D.L. suggested, SWR isn't a terribly critical concern. If you cut it for an overall length from skin to tip of 22", you're going to be close enough for government work. It would be interesting to see a plot of your measured SWR over the range of interest at say 1 Mhz steps. If you've got better things to do on your airplane, don't let this academic exploration get too high on the list of priorities. Bob . . . ________________________________ Message 6 _____________________________________ Time: 10:24:05 AM PST US From: Holger Selover-Stephan Subject: Re: AeroElectric-List: Re: Removable comm antenna On 12/16/12 9:02 AM, Robert L. Nuckolls, III wrote: > It appears that your coax center conductor > is attached to the 4-bolt flange (pop rivet?)] > which in turn is insulated from the mounting > bolts with a combination of insulating bushings > and washers. Where does the coax shield find > connection to the groundplane/skin? > > It's not clear how the antenna element is retained > on the aircraft/ D.L., Bob, thanks again! I'll go with 22 inches until I find someone with a SWR meter. If this person and I can get the data for the plot, I will send it to you, Bob. That's correct, the coax center is attached to that rectangular flange with a PIDG terminal. There is a threaded hole in the flange for it. The flange is welded to a SS tube that receives the antenna rod. As you said, the flange and tube is insulated against ground. I measured for conductivity. There is a spring in the tube, just to make sure there's good contact. The coax shield is connected to ground a few inches away. I left that unchanged from the previous whisker antenna installation. That riveted skin doubler is the result of my damaging the original antenna on the ground. Not going to happen anymore. But the main thing is, I can now sew a full cover to keep it dry outside, and won't have to put it on a trailer when a bit of wet weather is moving in. Means more flying for me! :)) Thanks, Holger ________________________________ Message 7 _____________________________________ Time: 10:39:14 AM PST US From: BobsV35B@aol.com Subject: Re: AeroElectric-List: Re: Removable comm antenna Good Afternoon Holger, Great workmanship! What I really love is that V-Tail. What kind of a machine is it? Happy Skies, Old Bob Downers Grove, Illinois V-Tail Aficionado In a message dated 12/16/2012 12:25:01 P.M. Central Standard Time, holger-d@shadowbrush.com writes: --> AeroElectric-List message posted by: Holger Selover-Stephan On 12/16/12 9:02 AM, Robert L. Nuckolls, III wrote: > It appears that your coax center conductor > is attached to the 4-bolt flange (pop rivet?)] > which in turn is insulated from the mounting > bolts with a combination of insulating bushings > and washers. Where does the coax shield find > connection to the groundplane/skin? > > It's not clear how the antenna element is retained > on the aircraft/ D.L., Bob, thanks again! I'll go with 22 inches until I find someone with a SWR meter. If this person and I can get the data for the plot, I will send it to you, Bob. That's correct, the coax center is attached to that rectangular flange with a PIDG terminal. There is a threaded hole in the flange for it. The flange is welded to a SS tube that receives the antenna rod. As you said, the flange and tube is insulated against ground. I measured for conductivity. There is a spring in the tube, just to make sure there's good contact. The coax shield is connected to ground a few inches away. I left that unchanged from the previous whisker antenna installation. That riveted skin doubler is the result of my damaging the original antenna on the ground. Not going to happen anymore. But the main thing is, I can now sew a full cover to keep it dry outside, and won't have to put it on a trailer when a bit of wet weather is moving in. Means more flying for me! :)) Thanks, Holger ________________________________ Message 8 _____________________________________ Time: 11:10:45 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: AeroElectric Connection Seminar Brodhead, WI, April 13-14, 2013 I'm pleased to announce that EAA Chapter 431 . . . http://tinyurl.com/cth5woc . . . of Brodhead, WI has offered their facility as a gathering place for an AeroElectric Connection weekend seminar next spring. The chapter has also graciously offered to underwrite the tuition for this presentation to the tune of $35 per attendee. It's been awhile since Dr. Dee and I have had an opportunity to travel to the hinterlands to meet with our readers and share our time, talents and resources. Students and second attendees of a partnership build may attend for 1/2 price. Spouses may attend free. Bring pictures of your projects, particularly in .jpg form. Also, bring any specialty tools you may have acquired and are wondering if they're applicable to your task. This seminar is in driving radius of home so we'll be able to bring more hands-on demonstration hardware than would normally be carried aboard ATC aircraft. The sign-up page has been posted to the AeroElectric Connection website at: http://tinyurl.com/9v9ffcq Bob . . . ________________________________ Message 9 _____________________________________ Time: 12:03:47 PM PST US Subject: AeroElectric-List: Re: SL30 intercom function From: "user9253" Thanks Charlie, If I would have looked closer, I would have realized that was an asterisk referring to a note, not a multiplication sign. :-) Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=390547#390547 ________________________________ Message 10 ____________________________________ Time: 04:23:51 PM PST US From: Charlie England Subject: AeroElectric-List: LARAGO ELT info needed Anyone recognize this ELT, or the antenna connector used? The antenna is missing, & the owner needs either an original 'fixed' antenna, or an adapter to a regular BNC connector/cable for an external antenna. He has the telescoping accessory antenna, but his IA won't sign off the plane with only that antenna. Thanks, Charlie ------------------------------------------------------------------------------------- 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.