BrendAn Posted June 8 Posted June 8 I noticed today my radio interference was so bad at 2800 rpm it was a struggle to hear a reply from another aircraft . If I cut the throttle the noise disappears. How do I tell if this is ignition or alternator noise. Also when we did the annual recently I changed to iridium plugs. Would that cause any issues. Tia
Area-51 Posted June 8 Posted June 8 (edited) I run iridium, no issues; make sure they are resistor type. Rotax also have a 5K resistor in the screw on spark plug connectors themselves. Mag test right left and see if static noise changes. Diagnostic; disconnect the exciter wire for the alternator field at the voltage regulator and ground test the engine again to see if noise is gone. Failed alternator capacitor may also be a source of noise. Edited June 8 by Area-51 1 1
Red Posted June 8 Posted June 8 (edited) Jab engine?, I had terrible RF interference on mine tried lots......Shielded P-Leads, new coils, Magnecore ignition leads, ferrites all over the place.....and finaly the thing that worked was resistor plugs. I actually chose Iridium Resistor plugs as I thought I made loose a bit of oomph with the resistor and the finer iridium tip might regain some of that loss back...anyway all 5s on the Radio after that. edit.Now I think about it I also tried a new regulator and Capacitor which made no difference, spent loads chasing that one Edited June 8 by Red 2
Red Posted June 8 Posted June 8 P.S. just looked at the logbook and the Plugs I fitted and cured the noise were NGK DR9 EIX 2
BrendAn Posted June 8 Author Posted June 8 16 minutes ago, Red said: P.S. just looked at the logbook and the Plugs I fitted and cured the noise were NGK DR9 EIX I am pretty sure that's what I fitted. Will check today. They were recommended for jabiru.
jetboy Posted June 9 Posted June 9 alternator noise (the switching noise of the regulator) will vary with electrical load and state of charging of the battery, Ignition noise is directly related to rpm. Vast majority of Jabiru noise is from ignition, Jabiru later changed the HT leads, reportedly most other improvement is had with "R" type plugs. If you want to study the test data results, I wrote it up here https://jabcamit.groups.io/g/main/files/Radio noise suppression you might have to subscribe, there are a lot of other files there too. 1
BrendAn Posted June 9 Author Posted June 9 These are the plugs and leads. Today I played around a bit with the radio and I turned the intercom off. It seems to be pretty good now. Radio is icom a210. 1
facthunter Posted June 9 Posted June 9 Noisy radios have been with us a long time. Shielded lead and plugs fixed it early on R Plugs and carbon leads are a no no with Magneto's. The higher resistance makes the Coils short out internally. High altitude operations requires Coils mounted near the plug and the HT section pressurised. Nev 1
spacesailor Posted June 9 Posted June 9 My " Fairbanks Morse " magneto specifies copper cored HT leads . I don't expect to get them from normal outlets . Any suggestions for replacements . spacesailor 1
Red Posted June 9 Posted June 9 (edited) 4 hours ago, BrendAn said: These are the plugs and leads. Today I played around a bit with the radio and I turned the intercom off. It seems to be pretty good now. Radio is icom a210. Red leads are the early type, they changed to black leads at some point, I can't remember the physical difference, I replaced mine with Magnecor leads, but they didnt seem to make much difference in setup If turning the intercom off made a big change perhaps looking at shielded cables between Radio and intercom might be worth a try.(only ground the shield at one end of the lead.) I seem to remember Icom handheld radios having a noise suppression setting, I guess you've tried that (if it still exists on the modern models) Edited June 9 by Red 1
BrendAn Posted June 9 Author Posted June 9 1 hour ago, Red said: Red leads are the early type, they changed to black leads at some point, I can't remember the physical difference, I replaced mine with Magnecor leads, but they didnt seem to make much difference in setup If turning the intercom off made a big change perhaps looking at shielded cables between Radio and intercom might be worth a try.(only ground the shield at one end of the lead.) I seem to remember Icom handheld radios having a noise suppression setting, I guess you've tried that (if it still exists on the modern models) The radio is an icom a210 . Not a handheld. The intercom is built into the radio. The wiring to the headset plugs is very short. It does have anl .
Red Posted June 9 Posted June 9 12 hours ago, BrendAn said: The radio is an icom a210 . Not a handheld. The intercom is built into the radio. The wiring to the headset plugs is very short. It does have anl . Aah, Sorry should have googled the radio model. glad you have found an improvement but losing the intercom isnt ideal. (Fault finding radio interference is the hardest type of tinkering in my experience) 1
BrendAn Posted June 10 Author Posted June 10 (edited) Radio seemed fine today . Rpm didn't have any effect, the only thing I noticed was the volts were sitting on an even 14 today. When the inference was bad was when i had to jump start it . Maybe more to do with charging circuit. Anyway I will leave it alone now while it's good. A friend did say I should invest in anr headsets because there is so much background noise in the xair. Edited June 10 by BrendAn
spacesailor Posted June 10 Posted June 10 I have an " anr " head set , it works equally well while mowing my lawn . LoL It reduces the exhaust noise as well as electrical , while listening to a tape or radio . spacesailor 1
BrendAn Posted June 10 Author Posted June 10 1 hour ago, spacesailor said: I have an " anr " head set , it works equally well while mowing my lawn . LoL It reduces the exhaust noise as well as electrical , while listening to a tape or radio . spacesailor They were going to sell them on here in the shop. I will see if they are available
facthunter Posted June 10 Posted June 10 Have you got a zero turn Mower?. You can pick up the headphones quicker. Nev
danny_galaga Posted July 24 Posted July 24 On 10/06/2024 at 3:14 PM, spacesailor said: while listening to a tape or radio . spacesailor Tape? Damn. 8 track? 😄 2
Mike Gearon Posted December 9 Posted December 9 On topic of radio noise. In thr RV6 I have 2 icom radios. 128.00 which is Tyabb frequency is a known problem with these radios. Static that comes and goes. Ended up a few weeks back with static on both radios on any frequency. Had it checked out and didn’t really come up with a solution other than it appeared to be alternator noise. Today both radios were crystal clear and yesterday they were both terrible. That bothers me a lot. Has anyone experienced this?
pmccarthy Posted December 9 Posted December 9 I found it was a slight breeze on the microphone from the cockpit ventilator. Turning the vent just a bit stopped the “static”. Happened on both headsets. 1 1 1
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