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#1
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Okay, so it's not the radio..... ??? I took off with the TKM,
yesterday morning, and it failed within 20 minutes! Same symptoms! Reception started to get scratchy, then no transmission with a loss of side-tone... I'm not sure if it makes sense to isolate the audio panel from the radio, since we have confirmed that the radio works in another plane and a working radio does not work in my plane??? Is the audio panel the logical culprit? I failed to mention earlier that the audio panel had been replaced last year with a used one, because I was encountering a "stuck-mike"... However, the radio worked fine for several months as I finished up my IFR work and took my check-ride in the plane. I haven't spoken with my mechanic yet this morning, but I'm thinking that he is leaning towards the audio panel as well... Any next step suggestions? See if I can swap out the audio panel with a working one too, I guess??? Thanks for the feedback! Clyde - I have seen a lot of unhappy Narco owners in the newsgroups, and probably wouldn't make it one of my top choices if I were to go down the road of buying a new radio. At this point, I'm trying not to throw good money after bad and am just trying to get up in the air again without having to rely on my hand-held! ;-) If the day comes, where I am faced with the purchase of a new radio, I will probably bite the bullet and see how I can tweak the finances to put in something like a Garmin GNS with built in com. As for a second radio, I'll have to start hitting the research! Best Regards! |
#2
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Think about it, grasshopper. The receive circuits ("scratchy reception")
and transmit circuits (no transmission & loss of sidetone) are completely separated in the audio panel. What is the ONLY element in the chain common to both transmit and receive? Do the words antenna/feedline strike a familiar note? Jim "three-eight-hotel" wrote in message oups.com... Okay, so it's not the radio..... ??? I took off with the TKM, yesterday morning, and it failed within 20 minutes! Same symptoms! Reception started to get scratchy, then no transmission with a loss of side-tone... I'm not sure if it makes sense to isolate the audio panel from the radio, since we have confirmed that the radio works in another plane and a working radio does not work in my plane??? |
#3
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Okay, so bear with me cuz technical electronics is not my forte'. I
can talk software and web development all day long, but circuit talk hurts my head... ;-) If I get scratchy to loss of reception, that's going through one circuit path in the audio panel. No transmission and side-tone loss is taking another route in the audio panel. So what I think you are saying is that it is not likely that both circuits went bad at the same time? The antenna was just replaced with a brand new one and my old one is currently on eBay to minimize my losses! That would leave the feedline... Is that something I could easily replace on my own? Would that be a legal thing for me to repair or should I just point my mechanic in that direction and eat the cost of the feedline and installation labor? Sorry for being such a knuckle-head... I guess I should have paid more attention in those electonics classes? I do remember something like "Bad Boys Rape Our Young Girls But Violet Gives Willingly"??? ;-) Greatly appreciate the input!!! |
#4
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Don't waste your time on Narco junk, it will save you time, headache and
money. I had to spend just over $700.00 on repairs to one which was just out of warrenty. Even after the repairs, it only lasted a little over a year. This radio had less than a hundred hours on it, I gave it a proper home in our local dump, just where it belongs. Clyde Woempner "three-eight-hotel" wrote in message oups.com... I have been struggling with a radio problem for some time now and am having a tough time finding the real "root cause"! (I have a Narco - Mark 12D) It started several months back, when I would occaisionally get a "stuck mike". After several phases of trouble-shooting, it appeared to be a problem with the audio panel, which was replaced and seemed to solve the problem. A month or so ago, I lost contact with ATC while shooting some practice approaches... Apparently, they could hear me, but I couldn't hear them (confirmed by using my hand-held). Ever since then, I have been having strange issues with the radio, but it will occaisionally work fine for 20 minutes or so??? Symptoms: 1. No side-tone when transmitting??? 2. Occaisional loss of reception on known frequencies 3. No response (on known frequencies) to transmissions I took the radio into a Narco dealer and they confirmed a problem with the transmission switch (replaced a diode) and yellow-tagged the radio. I put the radio in the plane and it worked like a champ for about 30 minutes and started to exhibit the symptoms again??? I took it back to the dealer and the bench tested it for a couple of hours and said that it worked fine and everything was within specs! :-( I'm worried about throwing good money after bad and don't even know where to begin in resolving this issue. (I can't afford to throw a lot of money at new avionics and would like to get what I have working, if at all possible) Does anybody have any recommendations at troubleshooting this problem? My mechanic is at a loss as well. The loss of side-tone, while transmitting, seems to be an interesting issue... Any suggestions would be greatly appreciated! |
#5
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I know it's summer, but I once found a leaky defroster hose spraying
hot air on one of our radios making it intermittent. We used a shop vac duct taped to the defroster air inlet under the cowl to diagnose it. I also agree that Narco stuff was marginal & that zener diodes and other solid state stuff doesn't become intermittent except for thermal issues. |
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