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#41
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It seemed to me that the most likely culprit was that last two inches of unshielded wiring and the unshielded connector...especially since they were the closest part of the wiring harness to the transponder. So, today I took a roll of aluminum foil out to the airplane and wrapped foil around the back of the radio, leading it down the wires until it contacted the braid. Duct tape, of course, to hold it in place. I'm happy to report that this solved the problem. Radio signals were perfectly clear. I figure the foil isn't worthwhile as a permanent solution. A guy at the airport suggested using aluminum window-screen material. It appeals to the cheap side of me. The inside? :-) You get more flying time per buck than anybody I know. What do you do with all the money you save? Ed Wischmeyer |
#42
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On Fri, 12 Mar 2004 19:30:24 -0700, Ed Wischmeyer
wrote: I figure the foil isn't worthwhile as a permanent solution. A guy at the airport suggested using aluminum window-screen material. It appeals to the cheap side of me. The inside? :-) You get more flying time per buck than anybody I know. What do you do with all the money you save? I sit in closet all evening, rubbing my face with dollar bills. :-) Ron Wanttaja |
#43
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Jim Weir wrote in
: As I recall, that flipflop triggers a timer (10 seconds???) that sends the ident bit until timeout. Bose' book confirms what I remember also. That sounds likely. [Book? You have a book? G] The main point, relative to this thread, is that it does NOT cause the transponder to transmit anything in and of itself. It only controls what gets sent upon interrogation. jmk |
#44
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- -That sounds likely. [Book? You have a book? G] Bose, Safford, Friedman, Krause, Jasik... - -The main point, relative to this thread, is that it does NOT cause the -transponder to transmit anything in and of itself. It only controls what -gets sent upon interrogation. That's the truth. Jim Jim Weir (A&P/IA, CFI, & other good alphabet soup) VP Eng RST Pres. Cyberchapter EAA Tech. Counselor http://www.rst-engr.com |
#45
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Ron:
Most hardware stores have copper and AL screenwire. With copper you can solder Your cage to fit. "Ron Wanttaja" wrote in message news I'd installed my new Microair transponder a month ago, but have been having troubles with interference. The transponder was inducing bad clicking sounds into the comm radio receiver, making the radio difficult to understand. I couldn't really blame the Microair, since the Terra transponder I'd had before did exactly the same thing. But I'd been hoping the new transponder and installation would eliminate the problem...especially since I'd reworked all the transponder wiring and moved the antenna to a different location. But the interference continued. The main suggestion I got from the avionics guys around here is that the transponder was interfering via the cables running to the headset jacks. I installed shielded braid over those cables, though, and the problem continued. All the electrical connections to the radio (except the antennas) are made via an unshielded flat connector. Since the wires had to spread out to fit the connector, I hadn't been able to run the braid all the way to the radio...it terminated about two inches away, and I ran a ground wire from the braid to the radio chassis. It seemed to me that the most likely culprit was that last two inches of unshielded wiring and the unshielded connector...especially since they were the closest part of the wiring harness to the transponder. So, today I took a roll of aluminum foil out to the airplane and wrapped foil around the back of the radio, leading it down the wires until it contacted the braid. Duct tape, of course, to hold it in place. I'm happy to report that this solved the problem. Radio signals were perfectly clear. I figure the foil isn't worthwhile as a permanent solution. A guy at the airport suggested using aluminum window-screen material. It appeals to the cheap side of me. Any drawbacks, or suggestions for alternates? Ron Wanttaja |
#46
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Ron:
Last time I was in the local Aerospace store they had it. But You can get it from: http://www.twpinc.com/twp/jsp/product.jsp?type=3 "Ron Wanttaja" wrote in message news I'd installed my new Microair transponder a month ago, but have been having troubles with interference. The transponder was inducing bad clicking sounds into the comm radio receiver, making the radio difficult to understand. I couldn't really blame the Microair, since the Terra transponder I'd had before did exactly the same thing. But I'd been hoping the new transponder and installation would eliminate the problem...especially since I'd reworked all the transponder wiring and moved the antenna to a different location. But the interference continued. The main suggestion I got from the avionics guys around here is that the transponder was interfering via the cables running to the headset jacks. I installed shielded braid over those cables, though, and the problem continued. All the electrical connections to the radio (except the antennas) are made via an unshielded flat connector. Since the wires had to spread out to fit the connector, I hadn't been able to run the braid all the way to the radio...it terminated about two inches away, and I ran a ground wire from the braid to the radio chassis. It seemed to me that the most likely culprit was that last two inches of unshielded wiring and the unshielded connector...especially since they were the closest part of the wiring harness to the transponder. So, today I took a roll of aluminum foil out to the airplane and wrapped foil around the back of the radio, leading it down the wires until it contacted the braid. Duct tape, of course, to hold it in place. I'm happy to report that this solved the problem. Radio signals were perfectly clear. I figure the foil isn't worthwhile as a permanent solution. A guy at the airport suggested using aluminum window-screen material. It appeals to the cheap side of me. Any drawbacks, or suggestions for alternates? Ron Wanttaja |
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