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dan(at)azshowersolutions.
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 Posted: Tue Jun 21, 2011 8:44 am Post subject: PTT buzz |
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I just finished wiring the Ray Allen G205 stick in conjunction w/ Garmin SL40 radio and the intercom PM1000 (PS Engineering). Turning it all on and headphone jacks connected...I talk into mic and hear loud and clear. When I key the PTT, I immediately get a pulsating buzz. I release, it goes away.
Could this be a ground loop? don't know...never heard this b-4.
Thanks,
Dan B
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dan(at)azshowersolutions.
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| Posted: Tue Jun 21, 2011 12:23 pm Post subject: PTT buzz |
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I think I found the ghost...When I first heard it it sounded like AC cycling (the noise was very consistant). AFter going thru this symptom with a few folks...Garmin techs saying they never heard of it b-4...
I was scratching my head and looked up. The antenna was hovering between two floursent lights in the garage...it WAS AC!
Dan
--- On Tue, 6/21/11, Dan Billingsley <dan(at)azshowersolutions.com> wrote:
| Quote: | From: Dan Billingsley <dan(at)azshowersolutions.com>
Subject: PTT buzz
To: aeroelectric-list(at)matronics.com
Date: Tuesday, June 21, 2011, 10:40 AM
--> AeroElectric-List message
posted by: Dan Billingsley <dan(at)azshowersolutions.com>
I just finished wiring the Ray Allen G205 stick in
conjunction w/ Garmin SL40 radio and the intercom PM1000 (PS
Engineering). Turning it all on and headphone jacks
connected...I talk into mic and hear loud and clear. When I
key the PTT, I immediately get a pulsating buzz. I release,
it goes away.
Could this be a ground loop? don't know...never heard this
b-4.
Thanks,
Dan B
AeroElectric-List Email Forum -
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Dralle, List Admin.
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 21, 2011 12:49 pm Post subject: PTT buzz |
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At 04:18 PM 6/21/2011, you wrote:
| Quote: |
<dan(at)azshowersolutions.com>
I think I found the ghost...When I first heard it it sounded like AC
cycling (the noise was very consistant). AFter going thru this
symptom with a few folks...Garmin techs saying they never heard of it b-4...
I was scratching my head and looked up. The antenna was
hovering between two floursent lights in the garage...it WAS AC!
Dan
|
Hmmmm . . . good hypothesis. If you turn off the lights
does the buzz go away?
Bob . . .
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dan(at)azshowersolutions.
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| Posted: Tue Jun 21, 2011 4:33 pm Post subject: PTT buzz |
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I didn't turn the lights off but I was able to roll the plane out from under the lights a ways. When I did that, the noise became less prominent. I will need to wait until I have an extra hand to roll the plane all the way out of the garage (The slope + gravity= plane in street). One of the guys I talked to today had a good point about when I key the mic inside the closed space I have quite a bit RF dancing back and forth in there. Would it be reasonable to say it could be some feedback interference as well?
Dan
--- On Tue, 6/21/11, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: | From: Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com>
Subject: Re: PTT buzz
To: aeroelectric-list(at)matronics.com
Date: Tuesday, June 21, 2011, 2:45 PM
--> AeroElectric-List message
posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
At 04:18 PM 6/21/2011, you wrote:
>
Billingsley <dan(at)azshowersolutions.com>
>
> I think I found the ghost...When I first heard it it
sounded like AC cycling (the noise was very consistant).
AFter going thru this symptom with a few folks...Garmin
techs saying they never heard of it b-4...
> I was scratching my head and looked up. The antenna
was hovering between two floursent lights in the
garage...it WAS AC!
> Dan
Hmmmm . . . good hypothesis. If you turn
off the lights
does the buzz go away?
Bob . . .
AeroElectric-List Email Forum -
FAQ,
- MATRONICS WEB FORUMS -
List Contribution Web Site -
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Dralle, List Admin.
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 21, 2011 6:06 pm Post subject: PTT buzz |
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At 08:29 PM 6/21/2011, you wrote:
| Quote: |
<dan(at)azshowersolutions.com>
I didn't turn the lights off but I was able to roll the plane out
from under the lights a ways. When I did that, the noise became less
prominent. I will need to wait until I have an extra hand to roll
the plane all the way out of the garage (The slope + gravity= plane
in street). One of the guys I talked to today had a good point about
when I key the mic inside the closed space I have quite a bit RF
dancing back and forth in there. Would it be reasonable to say it
could be some feedback interference as well?
|
Possible . . . but low risk. The lighting
interference hypothesis is much stronger
given that the noise changed when you moved.
Modern fluorescent lamps not only generate
noise from the cacophony of molecular
noise in the gas filled tube, they feature
electronic ballasts also renowned for their
ability to 'sing' at a constellation of
frequencies.
I'm betting on the lights.
Bob . . .
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