Tom Baker Posted August 2, 2021 Report Share Posted August 2, 2021 We have a 225 for our Taylorcraft, and are using the intercom, with audio input for music. I see no reason that the PM 3000 couldn't be removed from the system entirely. Quote Link to comment Share on other sites More sharing options...
okent Posted August 2, 2021 Author Report Share Posted August 2, 2021 That's what I'm thinking. Just bypass the PM 3000 totally. Can't take too much to do that (famous last words!) I just don't know what I could put in that place. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted August 2, 2021 Report Share Posted August 2, 2021 Put a placard of some kind over it. Quote Link to comment Share on other sites More sharing options...
okent Posted August 2, 2021 Author Report Share Posted August 2, 2021 Like a Garmin GPS 175... Quote Link to comment Share on other sites More sharing options...
airhound Posted August 3, 2021 Report Share Posted August 3, 2021 Dang, until I can repeat aux audio connectivity with just the 225, it may be wired differently than Tom’s T-Craft, I need to use both- 3000 for music when desired. Plus need to check pax side function.. Quote Link to comment Share on other sites More sharing options...
airhound Posted August 3, 2021 Report Share Posted August 3, 2021 Okent/Tom what’s wrong with just turning the 3000 off, in terms of bypassing? Or are you thinking Disconnecting the wires? Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted August 3, 2021 Report Share Posted August 3, 2021 I'm not sure how everything is wired, so turning it off may not give the results you want. Quote Link to comment Share on other sites More sharing options...
okent Posted August 4, 2021 Author Report Share Posted August 4, 2021 The passenger headset and auxillary/XM radio are wired to the 3000 only in my airplane. Shouldn't take much to switch those wires over. Quote Link to comment Share on other sites More sharing options...
airhound Posted August 5, 2021 Report Share Posted August 5, 2021 I’m all ears haven’t monkeyed with it lately. Quote Link to comment Share on other sites More sharing options...
airhound Posted August 9, 2021 Report Share Posted August 9, 2021 OKENT-Just confirmed and I have the same setup. For my flying, usually solo, the 225 alone cuts down on unwanted noise. I’ll use the 3000 on occasion when music is desired and it drowns out noise. Is rewiring still in the cards? Quote Link to comment Share on other sites More sharing options...
okent Posted August 9, 2021 Author Report Share Posted August 9, 2021 Yes, planning on a rewire. I'm almost due for an oil change and will have it done then. Will wire the AUX switch to toggle the XM radio. Edited to add that talking with Rex Johnson, he didn't think it would be a big deal to change that wiring. Quote Link to comment Share on other sites More sharing options...
airhound Posted August 9, 2021 Report Share Posted August 9, 2021 My switch has XM and Aux positions. Currently don’t have Xmas subscription. Are you thinking wiring the 796 XM to the 225 would play music thru the 225 IC as well as PTT? Quote Link to comment Share on other sites More sharing options...
okent Posted August 9, 2021 Author Report Share Posted August 9, 2021 Yes, I listen to XM radio almost every time I fly. I like having the ability to flip off the XM radio if things get busy and if it's wired into the 225 I want to wire in that switch to do the same. There's an AUX setting in the 225 but it is a few menu's deep. The switch would be really handy. Quote Link to comment Share on other sites More sharing options...
Anticept Posted August 27, 2021 Report Share Posted August 27, 2021 Keep in mind that ground loops can generate noise too. The audio system in flight designs leaves a lot to be desired; there's wires with no shielding or twisted pair, and ground connections in many places when instead there should be only a single branching ground path on audio connections. You may wish to consider using isolation transformers if you know how. Due to the complexity of the subject, I can only point to this and suggest you talk to someone about it, or do a deep dive into the theory in their use. Quote Link to comment Share on other sites More sharing options...
airhound Posted August 27, 2021 Report Share Posted August 27, 2021 Thanks for the tech thought. Dang, these design/production issues trump useage/maint issues and should be on FD to resolve. Noticed a FL Flight School went with Technam…wonder if they factored these kinds of gremlins in or flying characteristics for students? Quote Link to comment Share on other sites More sharing options...
Anticept Posted August 27, 2021 Report Share Posted August 27, 2021 There are other light sport aircraft with rotax engines that have the whine as well. But usually, it's the carb version. Haven't messed it with the injected version much. I've always solved it with a large filtering capacitor and getting grounds as clean as reasonably possible. My boss has a Cirrus SR22T that I fly, and it has a whine from the air conditioner. Edit: also consider doing voltage drop tests on the grounding. The lower, the better. A few thousandths milivolts at most is best, but realistically seeing a hundred milivolts is common. Quote Link to comment Share on other sites More sharing options...
okent Posted January 17, 2022 Author Report Share Posted January 17, 2022 Edited to add that the whine is still there after annual. A&P will be calling PS Engineering to see if anything can be done. They swapped out for a new PS3000 and no joy. Would like to avoid wiring directly to the garmin radio. Will post when I have more info. Quote Link to comment Share on other sites More sharing options...
airhound Posted October 8, 2023 Report Share Posted October 8, 2023 Any luck with the noise? Quote Link to comment Share on other sites More sharing options...
airhound Posted October 8, 2023 Report Share Posted October 8, 2023 On 1/17/2022 at 4:26 PM, okent said: Edited to add that the whine is still there after annual. A&P will be calling PS Engineering to see if anything can be done. They swapped out for a new PS3000 and no joy. Would like to avoid wiring directly to the garmin radio. Will post when I have more info. Any luck? Quote Link to comment Share on other sites More sharing options...
airhound Posted October 27, 2023 Report Share Posted October 27, 2023 Roger, is there anyone you can recommend for iS alternator/IC whining noise? Is OKENT still in CTFlyer? Thank you, Doug in IL. Quote Link to comment Share on other sites More sharing options...
ctbob Posted November 2, 2023 Report Share Posted November 2, 2023 I had a similar whine show up one day as I was warming up. Eventually the EFIS died followed by the radio and transponder.. on previous flights before these signs I was getting a “high fuel pressure “ warning, despite any other symptoms. Red herring perhaps. Any way in consultation with a local A&P, he suggested simply pulling the voltage regulator plug and reconnecting it. IT WORKED!, including stopping the fuel pressures warning. Major bugger to pull out the plug without damaging it, but with persistence I did it. Unrelated, I had two temp probes showing wild swings in readings. Obviously loose connections. Fixed by putting them both in slight traction by pulling them through their respective zip ties. Ta da! Fixed. Quote Link to comment Share on other sites More sharing options...
ODowneyEng Posted November 2, 2023 Report Share Posted November 2, 2023 There may be a relationship here on the subject. Couldn’t load link, so here is attached screenshot Quote Link to comment Share on other sites More sharing options...
airhound Posted November 5, 2023 Report Share Posted November 5, 2023 Thanks all….still chasing those infernal sparks, so to speak. Quote Link to comment Share on other sites More sharing options...
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