AirTalk.org Aviation discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Radio buzz Goto page 1, 2, 3  Next          AirTalk.org Forum Index -> Owning Airplanes View previous topic :: View next topic   Author Message Robert M. Gary Guest Posted: Mon Apr 16, 2007 6:12 am    Post subject: Radio buzz I have an MX170 radio that I use to pick up ATIS, etc. Recently it will occassionally have a buzz in it that is so loud you cannot hear the transmission. It will buzz on all freq, then later in the flight it will go away. This unit is no longer supported so I'm wondering if there is any chance this could be something that could be addressed without opening the unit (which is now illegal to do ). -Robert Back to top Robert M. Gary Guest Posted: Mon Apr 16, 2007 6:12 am    Post subject: Re: Radio buzz On Apr 15, 10:44 pm, "mikem" <mgm17...@utah.edu> wrote: Quote: On Apr 15, 10:42 pm, "mikem" <mgm17...@utah.edu> wrote: On Apr 15, 8:11 pm, "Robert M. Gary" <N70...@gmail.com> wrote: ...Recently it will occassionally have a buzz in it that is so loud you cannot hear the transmission. It will buzz on all freq, then later in the flight it will go away. What kind of buzz? When it buzzes, is the loudness of the buzz effected by the vol control? by the squelch control? is the buzz there even with the power switch off? One more question. When it buzzes, can you still tell that there would be a signal received if it where not for the buzz? I can hear the transmission in addition to the buzz. The buzz is affected by the volume control. I don't have a squelch control for the radio that I know of. However, pressing "test" (removing squelch) doesn't affect the problem. -Robert Back to top mikem Guest Posted: Mon Apr 16, 2007 6:12 am    Post subject: Re: Radio buzz On Apr 15, 10:42 pm, "mikem" <mgm17...@utah.edu> wrote: Quote: On Apr 15, 8:11 pm, "Robert M. Gary" <N70...@gmail.com> wrote: ...Recently it will occassionally have a buzz in it that is so loud you cannot hear the transmission. It will buzz on all freq, then later in the flight it will go away. What kind of buzz? When it buzzes, is the loudness of the buzz effected by the vol control? by the squelch control? is the buzz there even with the power switch off? One more question. When it buzzes, can you still tell that there would be a signal received if it where not for the buzz? Back to top mikem Guest Posted: Mon Apr 16, 2007 6:12 am    Post subject: Re: Radio buzz On Apr 15, 8:11 pm, "Robert M. Gary" <N70...@gmail.com> wrote: Quote: ...Recently it will occassionally have a buzz in it that is so loud you cannot hear the transmission. It will buzz on all freq, then later in the flight it will go away. What kind of buzz? When it buzzes, is the loudness of the buzz effected by the vol control? by the squelch control? is the buzz there even with the power switch off? Back to top mikem Guest Posted: Mon Apr 16, 2007 8:06 pm    Post subject: Re: Radio buzz Quote: I can hear the transmission in addition to the buzz. The buzz is affected by the volume control. I don't have a squelch control for the radio that I know of. However, pressing "test" (removing squelch) doesn't affect the problem. Ok, assuming the radio is "normal" (not buzzing), if you tune the radio to a quiet channel where no-one is transmitting, with the squelch switch in the TEST position, what do you hear? When the radio is buzzing, tune the radio to a quiet channel where no- one is transmitting, with the squelch switch in the TEST position, what do you hear? While it's buzzing, have you every tried pushing on the MX170's front panel so as to seat it into its tray? I could be that the tray is poorly mounted, and one-or-more pins in the tray connector are making intermittent contact. Does the buzzing follow engine rpm? While its buzzing, what happens if you turn on/off heavy electrical loads, like nav/taxi/landing lights and pitot heat? What about turning off the right mag/left mag briefly in flight? I'm trying to determine if the buzzing is RFI being received by the MX170 as an on-channel radio signal (which open's the receiver's squelch), or if it is something that is originating inside the MX170. Back to top Robert M. Gary Guest Posted: Mon Apr 16, 2007 10:12 pm    Post subject: Re: Radio buzz On Apr 16, 8:06 am, "mikem" <mgm17...@utah.edu> wrote: Quote: I can hear the transmission in addition to the buzz. The buzz is affected by the volume control. I don't have a squelch control for the radio that I know of. However, pressing "test" (removing squelch) doesn't affect the problem. Ok, assuming the radio is "normal" (not buzzing), if you tune the radio to a quiet channel where no-one is transmitting, with the squelch switch in the TEST position, what do you hear? When the radio is buzzing, tune the radio to a quiet channel where no- one is transmitting, with the squelch switch in the TEST position, what do you hear? While it's buzzing, have you every tried pushing on the MX170's front panel so as to seat it into its tray? I could be that the tray is poorly mounted, and one-or-more pins in the tray connector are making intermittent contact. Does the buzzing follow engine rpm? While its buzzing, what happens if you turn on/off heavy electrical loads, like nav/taxi/landing lights and pitot heat? What about turning off the right mag/left mag briefly in flight? I'm trying to determine if the buzzing is RFI being received by the MX170 as an on-channel radio signal (which open's the receiver's squelch), or if it is something that is originating inside the MX170. Ok, I'll try that. I know the unit is on its last legs. I've tried to have it serviced but the one guy that is authorize by the FAA to open the unit just wants to sell new units and flat our refuses to offer any serivce/support/parts/etc (makes you want to buy his new unit, doesn't it;) ). -Robert Back to top Chris Guest Posted: Tue Apr 17, 2007 12:51 am    Post subject: Re: Radio buzz "Robert M. Gary" <N7093v (AT) gmail (DOT) com> wrote in message news:1176743550.521417.260600 (AT) d57g2000hsg (DOT) googlegroups.com... Quote: Ok, I'll try that. I know the unit is on its last legs. I've tried to have it serviced but the one guy that is authorize by the FAA to .... Just buy another unit then. Back to top Robert M. Gary Guest Posted: Tue Apr 17, 2007 2:28 am    Post subject: Re: Radio buzz On Apr 16, 12:51 pm, "Chris" <t...@sparkbrook.com> wrote: Quote: "Robert M. Gary" <N70...@gmail.com> wrote in messagenews:1176743550.521417.260600 (AT) d57g2000hsg (DOT) googlegroups.com... Ok, I'll try that. I know the unit is on its last legs. I've tried to have it serviced but the one guy that is authorize by the FAA to .... Just buy another unit then. That's the plan. However changing anything in the traying of a Mooney is very, very, very expensive. -Robert Back to top RST Engineering Guest Posted: Thu Apr 19, 2007 7:25 pm    Post subject: Re: Radio buzz That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N7093v (AT) gmail (DOT) com> wrote in message news:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... > without opening the unit (which is now illegal to do ). Back to top The Visitor Guest Posted: Thu Apr 19, 2007 7:44 pm    Post subject: Re: Radio buzz If he opens it up, isn't there some sort of qualifications he needs to certify it and return it to service? RST Engineering wrote: Quote: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N7093v (AT) gmail (DOT) com> wrote in message news:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... without opening the unit (which is now illegal to do ). Back to top RST Engineering Guest Posted: Thu Apr 19, 2007 9:51 pm    Post subject: Re: Radio buzz "The Visitor" <ksjhdsdfssjhfk (AT) shduiysdfsrewh (DOT) com> wrote in message news:lfLVh.32$WE.11 (AT) read1 (DOT) cgocable.net... Quote: If he opens it up, isn't there some sort of qualifications he needs to certify it and return it to service? You just don't get it, do you? No. Quote: RST Engineering wrote: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N7093v (AT) gmail (DOT) com> wrote in message news:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... without opening the unit (which is now illegal to do ). Back to top Robert M. Gary Guest Posted: Fri Apr 20, 2007 2:05 am    Post subject: Re: Radio buzz On Apr 19, 7:25 am, "RST Engineering" <j...@rstengineering.com> wrote: Quote: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N70...@gmail.com> wrote in messagenews:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... without opening the unit (which is now illegal to do ).- Hide quoted text - - Show quoted text - I'm told you have to have an FAA approved manual for the unit to open it. The manufactor has keep those manuals secret (like Garmin does) so you have to send it to the factory. However, the factory will no longer look at it. Are you saying you would be willing to open the unit and service it for me??? -Robert Back to top The Visitor Guest Posted: Fri Apr 20, 2007 9:07 pm    Post subject: Re: Radio buzz RST Engineering wrote: Quote: You just don't get it, do you? No. Well I am not familiar with US rules. So I was asking. You know what "asking" is, don't you? But you should not one to shoot your mouth off, are you. Like there are no fuel injected 172's, wasn't that you? Wasn't that you, wrong about some other things also? Problem being friendly? Having read many of your posts, you shouldn't be acting the way you do. Thank's for reading.... Back to top Michael Houghton Guest Posted: Fri Apr 20, 2007 11:03 pm    Post subject: Re: Radio buzz Howdy! In article <1177016734.382972.314240 (AT) q75g2000hsh (DOT) googlegroups.com>, Robert M. Gary <N7093v (AT) gmail (DOT) com> wrote: Quote: On Apr 19, 7:25 am, "RST Engineering" <j...@rstengineering.com> wrote: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N70...@gmail.com> wrote in messagenews:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... without opening the unit (which is now illegal to do ).- Hide quoted text - - Show quoted text - I'm told you have to have an FAA approved manual for the unit to open it. The manufactor has keep those manuals secret (like Garmin does) so you have to send it to the factory. However, the factory will no longer look at it. Are you saying you would be willing to open the unit and service it for me??? You initial statement was a bald assertion that opening the unit was *illegal* for you to do. Now you say that someone (unnamed) told you this. Perhaps you could examine the relevant regulations to see what rules apply in what way. Merely opening up the case is unlikely to be *illegal* on its face. It might be that, having opened it up, it can't be put back into service (as a transmitter) without the blessing of someone with the appropriate radio credentials. It might be that any repairs that are made have to be vetted by same credentialed repair person. It might be an old wives' tale. I don't know the answer, and I bet Jim does, but you haven't asked the right question. yours, Michael -- Michael and MJ Houghton | Herveus d'Ormonde and Megan O'Donnelly herveus (AT) radix (DOT) net | White Wolf and the Phoenix narrowwares Bowie, MD, USA | http://whitewolfandphoenix.com Proud member of the SCA Internet Whitewash Squad Back to top The Visitor Guest Posted: Sat Apr 21, 2007 4:17 am    Post subject: Re: Radio buzz In Canada a pilot isn't even allowed to remove and re-install a radio. Actually not even tighten it up in it's tray, technically. Obviously those get ignored alot but opening the case, hmmmm. I'm sure his local(or not so local) FSDO will help him out. John Michael Houghton wrote: Quote: Howdy! In article <1177016734.382972.314240 (AT) q75g2000hsh (DOT) googlegroups.com>, Robert M. Gary <N7093v (AT) gmail (DOT) com> wrote: On Apr 19, 7:25 am, "RST Engineering" <j...@rstengineering.com> wrote: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" <N70...@gmail.com> wrote in messagenews:1176693109.733600.114470 (AT) b75g2000hsg (DOT) googlegroups.com... without opening the unit (which is now illegal to do ).- Hide quoted text - - Show quoted text - I'm told you have to have an FAA approved manual for the unit to open it. The manufactor has keep those manuals secret (like Garmin does) so you have to send it to the factory. However, the factory will no longer look at it. Are you saying you would be willing to open the unit and service it for me??? You initial statement was a bald assertion that opening the unit was *illegal* for you to do. Now you say that someone (unnamed) told you this. Perhaps you could examine the relevant regulations to see what rules apply in what way. Merely opening up the case is unlikely to be *illegal* on its face. It might be that, having opened it up, it can't be put back into service (as a transmitter) without the blessing of someone with the appropriate radio credentials. It might be that any repairs that are made have to be vetted by same credentialed repair person. It might be an old wives' tale. I don't know the answer, and I bet Jim does, but you haven't asked the right question. yours, Michael Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AirTalk.org Forum Index -> Owning Airplanes All times are GMT Goto page 1, 2, 3  Next Page 1 of 3   Jump to: Select a forum Aviation----------------alt.aviationAviation safety EnhancementPlanes, gliders and flying in AustraliaAviation et pilotage (Français)rec.aviationAviation (Aerobatics)Hot air, gas balloons and airshipsHang-gliding, paragliding, foot-launched flightAircraft Design & BuildingInstrument Flight RulesAviation (Classifieds)Military AircraftNaval AviationAviation (Miscellaneous Topics)Owning AirplanesAviators (General Discussions)Aviation related productsAircraft RestorationHelicopters and rotary wing aircraftsFlight SimulationSailplanesAviation (Students)Light aircraftFlying related activities in the UK Airports----------------alt.airportsEdinburgh Airport Glasgow Airport Humberside Airport Luton Airport Aberdeen Airport Glasgow Prestwick Airport  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.