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Noise from Garmin 496

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rv6awingman(at)gmail.com
Guest

Posted: Sun Dec 12, 2010 7:27 am Post subject: Noise from Garmin 496

I posted a message a few days ago and haven't seen one response.  Question is, has anyone else found that their Garmin handheld with 30A weather antenna produces a periodic type "hiss" noise in their radios?

 Marty

  [quote][b]

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dave.saylor.aircrafters(a
Guest

Posted: Sun Dec 12, 2010 8:13 am Post subject: Noise from Garmin 496

I get kind of a da-da-da-shhhh (repeat endlessly) from my 696.  If I

disable the DC-IN it goes away.  It's a pretty low level background

noise that I can live with.  I've tried all kinds of filters and

alternate grounds with some relief but it's still noticeable.  The

noise is there whenever the 696 is plugged in, whether its powered on

or not.  I assume it has something to do with the battery being

charged/monitored.



Dave Saylor

AirCrafters

140 Aviation Way

Watsonville, CA 95076

831-722-9141 Shop

831-750-0284 Cell



On Sun, Dec 12, 2010 at 7:21 AM, Marty <rv6awingman(at)gmail.com> wrote:

 	  Quote: 	
		   I posted a message a few days ago and haven't seen one response. Â Question

 is, has anyone else found that their Garmin handheld with 30A weather

 antenna produces a periodic type "hiss" noise in their radios?

 Marty

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kevann(at)gotsky.com
Guest

Posted: Sun Dec 12, 2010 2:16 pm Post subject: Noise from Garmin 496

I have a 496 with weather, mounted just above the  comm radio. No hiss. Power is through the external cable to the main  bus.

  

 Kevin

 [quote]   ---

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rv6awingman(at)gmail.com
Guest

Posted: Tue Dec 14, 2010 7:53 am Post subject: Noise from Garmin 496

Thanks to Kevin K and Dave S for their replies.  Seems like some installations may have noise and others not. I'll try disconnecting the power line next visit to the airport, but we're "frozen" in here in Nashville TN.  If that works, I suspect there is some "output" from my 496 that is generating the noise. Pulling the power input line, which also has the power outputs will give some clues that it is in the 496 output side versus perhaps the weather antenna. My GPS output signal is split into three (max per Garmin) to feed my Dynon D10A, Electronic International Fuel Totalizer, and the third device escapes me right now, perhaps its the EI SuperClock.  I also feed the output to Garmin's SL30 radio to feed the com and nav frequencies, and the warnings to my Garmin Audio Panel. 

 Waiting now for warmer weather to go do some testing!  Thanks again folks for your thoughts.

Marty N826ME RV-6A

  [quote][b]

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enginerdy(at)gmail.com
Guest

Posted: Tue Dec 14, 2010 8:16 am Post subject: Noise from Garmin 496

Easier than disconnecting the power line, does it make the noise after

it is fully charged? Some consumer devices with Li+ batteries have a

habit of hammering the power line with noise while charging.



It sounds like you have a lot of possible ground paths for the Garmin.

Any of these can cause the charging return current to take an

unwanted, roundabout path back to the battery. Additionally, if your

audio output is single-ended (Audio+ to signal, Audio- to ground)

large (by comparison) power currents can cause the unit to 'float' a

bit from ground potential. When the power current varies, the 'floats'

are cyclical, and you could hear it as noise.



Hope that helps!



--Daniel



On Tue, Dec 14, 2010 at 9:50 AM, Marty <rv6awingman(at)gmail.com> wrote:

 	  Quote: 	
		   Thanks to Kevin K and Dave S for their replies.  Seems like some

 installations may have noise and others not. I'll try disconnecting the

 power line next visit to the airport, but we're "frozen" in here in

 Nashville TN.  If that works, I suspect there is some "output" from my 496

 that is generating the noise. Pulling the power input line, which also has

 the power outputs will give some clues that it is in the 496 output side

 versus perhaps the weather antenna.

 My GPS output signal is split into three (max per Garmin) to feed my Dynon

 D10A, Electronic International Fuel Totalizer, and the third device escapes

 me right now, perhaps its the EI SuperClock.  I also feed the output to

 Garmin's SL30 radio to feed the com and nav frequencies, and the warnings to

 my Garmin Audio Panel.

 Waiting now for warmer weather to go do some testing!  Thanks again folks

 for your thoughts.

 Marty N826ME RV-6A


	


-- 

Daniel Hooper

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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rv6awingman(at)gmail.com
Guest

Posted: Wed Dec 15, 2010 7:38 am Post subject: Noise from Garmin 496

Daniel,Thanks for your thoughts.  The 496 is mounted in the panel and the Li+ batteries are always being charged by ships power when running. I've never known the batteries not to be charged, but that is something to be experimented with. The Audio output may be single ended, I'll have to get the diagrams out to find out ( I do think they are single ended) but if the batteries are charged it would seem the charging currents would be small. I do have all devices in the panel going to a single point ground on the firewall.

 Marty______

Time: 08:16:35 AM PST US

Subject: Re: Noise from Garmin 496

From: Daniel Hooper <enginerdy(at)gmail.com (enginerdy(at)gmail.com)>

Easier than disconnecting the power line, does it make the noise after

it is fully charged? Some consumer devices with Li+ batteries have a

habit of hammering the power line with noise while charging.

It sounds like you have a lot of possible ground paths for the Garmin.

 Any of these can cause the charging return current to take an

unwanted, roundabout path back to the battery. Additionally, if your

audio output is single-ended (Audio+ to signal, Audio- to ground)

large (by comparison) power currents can cause the unit to 'float' a

 bit from ground potential. When the power current varies, the 'floats'

are cyclical, and you could hear it as noise.

Hope that helps!

--Daniel

On Tue, Dec 14, 2010 at 9:50 AM, Marty <rv6awingman(at)gmail.com (rv6awingman(at)gmail.com)> wrote:

 > Thanks to Kevin K and Dave S for their replies. Seems like some

 	  Quote: 	
		   installations may have noise and others not. I'll try disconnecting the

 power line next visit to the airport, but we're "frozen" in here in

 > Nashville TN. If that works, I suspect there is some "output" from my 496

 	  Quote: 	
		   that is generating the noise. Pulling the power input line, which also has

 the power outputs will give some clues that it is in the 496 output side

 > versus perhaps the weather antenna.

 	  Quote: 	
		   My GPS output signal is split into three (max per Garmin) to feed my Dynon

 D10A, Electronic International Fuel Totalizer, and the third device escapes

 me right now, perhaps its the EI SuperClock. I also feed the output to

 > Garmin's SL30 radio to feed the com and nav frequencies, and the warnings to

 	  Quote: 	
		   my Garmin Audio Panel.

 Waiting now for warmer weather to go do some testing! Thanks again folks

 for your thoughts.

 > Marty N826MERV-6A

 	  Quote: 	

--

Daniel Hooper

  [quote][b]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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