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#1
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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 |
#2
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Radio buzz
On Apr 15, 8:11 pm, "Robert M. Gary" 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? |
#3
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Radio buzz
On Apr 15, 10:42 pm, "mikem" wrote:
On Apr 15, 8:11 pm, "Robert M. Gary" 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? |
#4
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Radio buzz
On Apr 15, 10:44 pm, "mikem" wrote:
On Apr 15, 10:42 pm, "mikem" wrote: On Apr 15, 8:11 pm, "Robert M. Gary" 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 |
#5
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Radio 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. 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. |
#6
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Radio buzz
On Apr 16, 8:06 am, "mikem" wrote:
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 |
#7
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Radio buzz
"Robert M. Gary" wrote in message oups.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. |
#8
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Radio buzz
On Apr 16, 12:51 pm, "Chris" wrote:
"Robert M. Gary" wrote in ooglegroups.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 |
#9
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Radio buzz
That's an interesting heresy and untruth. Mind telling us how you came to
believe this? Jim "Robert M. Gary" wrote in message oups.com... without opening the unit (which is now illegal to do ). |
#10
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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: That's an interesting heresy and untruth. Mind telling us how you came to believe this? Jim "Robert M. Gary" wrote in message oups.com... without opening the unit (which is now illegal to do ). |
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