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nuckolls.bob(at)aeroelect
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 Posted: Wed Sep 02, 2015 9:54 am Post subject: Request for some direction and advise |
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| Quote: | | One other thing that I just thought of that may be a factor. The backing plate through connectors that the radio slides into when it is inserted into the tray are very wobbly. It is very easy to make a circle with them that is at least 1/8 inch in radius. I have never thought about these connectors before because I thought that they were wobbly in order to line up with the radio when in is inserted. But now thinking about it, it seems to me that they should firm up when the radio is inserted because they are making rigid contact with the radio?? Mine are still wobbly after the radio is inserted. Could these connectors or the backing plate be somehow incorrectly installed? |
Tray connectors often 'float' on the tray
itself so as to accommodate dimenational differences
between tray and radio as the radio is slid into
the tray. Similarly, your antenna connectors
a the back of the radio may appear 'loose' in
spite of having perfect electrical integrity.
http://tinyurl.com/qa5hr7l
In the image sited above, we see where electrical
integrity is achieved as a separate component
of mechanical mounting. A BNC connector attached
to an appliance.
http://tinyurl.com/pmy4hsg
In the video above, we see that a connector is
"loose" to move in some regard while mantaining
electrical integrity of the connection.
| Quote: |
Does anyone know if these connectors should be firm after the radio is installed? Could this be where I have a bad connection with the shield? |
The connections I am most concerned about are
between the coax shield and it's terminating
connector.
| Quote: |
What about the other shield grounds described below? Would they be a factor if that card edge connector does not make a firm connection? There is a boss just to the side of this card edge connector that I am considering using to run a separate ground wire from the backing plate to the “forest of tabs” ground block. Are there any opinions on this idea?
|
Your symptoms scream of antagonistic disruption of
TWO different systems that suggest
a problem with the level of RF in the cockpit
due to an antenna system problem . . . not with
the radio's power/signal wires.
Bob . . . [quote][b]
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bbradburry(at)verizon.net
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| Posted: Wed Sep 02, 2015 8:31 pm Post subject: Request for some direction and advise |
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Bob,
Success!
I thank you for sending me in the proper direction to find this problem. I would never have figured out that it was RF loose in the cockpit. While I was checking for where I could possibly have a loose connection this afternoon, I removed the radio from the tray and measured both the length of the radio and the distance it had to reach to the connectors in the back plate. Whoops! Looks like the radio needs to be seated deeper into the tray!
Stupid builder tricks! When I installed the radio, I installed a bezel around them and to make it look nicer, I put the bezel under the faceplate on the radio. The radio passed the test Garmin has for that, (three turns of the screw after the radio powers on) but apparently over time it got looser and looser and started having more and more symptoms. I modified the bezel this afternoon so the radio would properly seat and the problem appears to have resolved. I was getting a huge RF leak from the back of the radio prior to it getting into the coax.
I am completing my conditional inspection so it will be a few days before I can fly and see just what symptoms I have fixed.
Thanks, Bob!
Bill
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Wednesday, September 02, 2015 12:53 PM
To: aeroelectric-list(at)matronics.com
Subject: RE: AeroElectric-List: RE: Request for some direction and advise
| Quote: |
One other thing that I just thought of that may be a factor. The backing plate through connectors that the radio slides into when it is inserted into the tray are very wobbly. It is very easy to make a circle with them that is at least 1/8 inch in radius. I have never thought about these connectors before because I thought that they were wobbly in order to line up with the radio when in is inserted. But now thinking about it, it seems to me that they should firm up when the radio is inserted because they are making rigid contact with the radio?? Mine are still wobbly after the radio is inserted. Could these connectors or the backing plate be somehow incorrectly installed? |
Tray connectors often 'float' on the tray
itself so as to accommodate dimenational differences
between tray and radio as the radio is slid into
the tray. Similarly, your antenna connectors
a the back of the radio may appear 'loose' in
spite of having perfect electrical integrity.
http://tinyurl.com/qa5hr7l
In the image sited above, we see where electrical
integrity is achieved as a separate component
of mechanical mounting. A BNC connector attached
to an appliance.
http://tinyurl.com/pmy4hsg
In the video above, we see that a connector is
"loose" to move in some regard while mantaining
electrical integrity of the connection.
Does anyone know if these connectors should be firm after the radio is installed? Could this be where I have a bad connection with the shield?
The connections I am most concerned about are
between the coax shield and it's terminating
connector.
What about the other shield grounds described below? Would they be a factor if that card edge connector does not make a firm connection? There is a boss just to the side of this card edge connector that I am considering using to run a separate ground wire from the backing plate to the forest of tabs ground block. Are there any opinions on this idea?
Your symptoms scream of antagonistic disruption of
TWO different systems that suggest
a problem with the level of RF in the cockpit
due to an antenna system problem . . . not with
the radio's power/signal wires.
Bob . . . | Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
0123456789
[quote][b]
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skywagon
Joined: 11 Feb 2006
Posts: 184
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| Posted: Thu Sep 03, 2015 10:41 am Post subject: Request for some direction and advise |
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Some Garmin 430 users (maybe others) have had problems with their comm side suddenly go on the fritz.
If the the chassis "tray" is not mounted with its forward lip aligned with the panel front edge or, better, a tad forward of the panel front face, it can loose connections in the rear connection sockets.
Many times these chassis are mounted without this fact in mind and are bolted in slightly to the rear. The 430 bezel stops the unit from being pushed fully into this ill mounted chassis.
It is also important to use your thumbs to mount the 430 into the chassis and using the chassis locking screw to only complete what your thumbs do to get the 430 fully engaged in the rear connections. Don't force the 430 in using only the chassis locking screw adjuster.
D
[quote] ---
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