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dave(at)abrahamson.net
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 Posted: Tue Jul 10, 2007 4:30 pm Post subject: Garmin 430 transmitter problem |
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My 430 was transmitting fine for the first 28 hours of my phase I
period, but at the end of the last flight was inaudible to approach.
After flight, I pulled and re-docked the 430 and compared its
transmissions to the SL30's in the same panel (same freq, same volume
level, same type antennas, same antenna location on the airplane,
engine off) and got a "like the SL30 but scratchy" from one station,
and "4 by 4 on the SL30 and 3 by 3 on the 430" from another. Maybe
significantly, the headset side tone from the 430 is about half the
volume of the SL30's, without touching settings on the headset or
GMA340, obviously. All other 430 functions work fine, to include
reception and VOR/ILS freqs.
Has anyone had a similar/identical problem with their 430, and if so,
what solutions were successful?
Thanks,
David
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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Wed Jul 11, 2007 3:23 am Post subject: Garmin 430 transmitter problem |
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I had a similar problem and spent 2 weeks on it. If there is seperate power to the VOR input, then the radio looks like it works, shows tx when transmitting, but the transmissions are junk. In my case I could barely be heard by a plane next to me. Since your being heard, this may not be the problem, but Id check it.
I finally broke down and took it to Stark avionics shop. They spent 4 hours on it.
IT WAS THE COM FUSE!!!!
Geez:
Mike
[img]cid:1__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]David Abrahamson <dave(at)abrahamson.net>
[img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
To
[img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
aeroelectric-list(at)matronics.com [img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
cc
[img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
[img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
Subject
[img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
Garmin 430 transmitter problem [img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img][img]cid:3__=08BBF986DFAE563C8f9e8a93df938(at)us.ibm.com[/img]
--> AeroElectric-List message posted by: David Abrahamson <dave(at)abrahamson.net>
My 430 was transmitting fine for the first 28 hours of my phase I
period, but at the end of the last flight was inaudible to approach.
After flight, I pulled and re-docked the 430 and compared its
transmissions to the SL30's in the same panel (same freq, same volume
level, same type antennas, same antenna location on the airplane,
engine off) and got a "like the SL30 but scratchy" from one station,
and "4 by 4 on the SL30 and 3 by 3 on the 430" from another. Maybe
significantly, the headset side tone from the 430 is about half the
volume of the SL30's, without touching settings on the headset or
GMA340, obviously. All other 430 functions work fine, to include
reception and VOR/ILS freqs.
Has anyone had a similar/identical problem with their 430, and if so,
what solutions were successful?
Thanks,
David
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dave(at)abrahamson.net
Guest
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| Posted: Thu Jul 12, 2007 6:53 am Post subject: Garmin 430 transmitter problem |
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If it was the fuse, I don't understand why you were transmitting at
all. I will call Stark soon if I can't figure it out myself with the
list's help, but I was hoping the weak sidetone would be a helpful
clue. Thanks for your help. David
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glcasey
Joined: 01 Jul 2007
Posts: 23
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| Posted: Thu Jul 12, 2007 7:36 am Post subject: Garmin 430 transmitter problem |
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Is that a fuse internal to the radio? I seem to have the same
problem. My 430 receives just fine, but transmissions are virtually
non-existent.
Gary Casey
| Quote: | Time: 04:23:58 AM PST US
Subject: Re: Garmin 430 transmitter problem
From: Michael W Stewart <mike.stewart(at)us.ibm.com>
I had a similar problem and spent 2 weeks on it. If there is
seperate p
ower
to the VOR input, then the radio looks like it works, shows tx when
transmitting, but the transmissions are junk. In my case I could
barely
be
heard by a plane next to me. Since your being heard, this may not
be th
e
problem, but Id check it.
I finally broke down and took it to Stark avionics shop. They spent
4 h
ours
on it.
IT WAS THE COM FUSE!!!!
Geez:
Mike
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
Gary Casey |
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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Thu Jul 12, 2007 12:00 pm Post subject: Garmin 430 transmitter problem |
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No in my case it was a fuse to the com input.
No fuses nside.
Mike
[img]cid:1__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]Gary Casey <glcasey(at)adelphia.net>
[img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
To
[img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
aeroelectric-list(at)matronics.com [img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
cc
[img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
[img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
Subject
[img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
Re: Garmin 430 transmitter problem [img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img][img]cid:3__=08BBF985DFFEFE2C8f9e8a93df938(at)us.ibm.com[/img]
--> AeroElectric-List message posted by: Gary Casey <glcasey(at)adelphia.net>
Is that a fuse internal to the radio? I seem to have the same
problem. My 430 receives just fine, but transmissions are virtually
non-existent.
Gary Casey
> Time: 04:23:58 AM PST US
> Subject: Re: Garmin 430 transmitter problem
> From: Michael W Stewart <mike.stewart(at)us.ibm.com>
>
>
> I had a similar problem and spent 2 weeks on it. If there is
> seperate p
> ower
> to the VOR input, then the radio looks like it works, shows tx when
> transmitting, but the transmissions are junk. In my case I could
> barely
> be
> heard by a plane next to me. Since your being heard, this may not
> be th
> e
> problem, but Id check it.
> I finally broke down and took it to Stark avionics shop. They spent
> 4 h
> ours
> on it.
> IT WAS THE COM FUSE!!!!
> Geez:
> Mike
=====================================
orum -
tor?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
=====================================
EB FORUMS -
tp://forums.matronics.com
=====================================
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dave(at)abrahamson.net
Guest
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| Posted: Sat Jul 14, 2007 1:13 pm Post subject: Garmin 430 transmitter problem |
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I received the following advice from a local avionics tech.
"First thing I would look at is the Com1 circuit breaker. The 430
has two power circuits... one for the com and one for the
nav/gps. The nav/gps will light the unit up and allow the Nav and
GPS to work, but if the com side isn't getting any (or is getting
low) voltage, then you would have transmission issues. So check the
breaker to make sure it isn't giving a high resistance when closed,
and that you have voltage going to the power pins on the com
plug. It might just be best to replace the com breaker with a new
one just to be sure. The next would be to swap com coaxes between
the SL30 and the 430. If it follows the antenna, then you know it is
the coax, antenna, or bonding issue. If it doesn't then you know you
have an issue with the 430 transmitter."
I haven't had a chance to go back out to the airport yet, but the
very first thing I will check will be that I have a good ground to
the 430's com circuit. Then, his suggestions. FWIW, one
of Garmin's Aviation Field Service Engineers replied to my email
with "This sounds like a problem in the GNS430 itself and will need
to come back for repair."
I'll advise what I find and do.
David
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dave(at)abrahamson.net
Guest
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| Posted: Mon Jul 16, 2007 8:45 am Post subject: Garmin 430 transmitter problem |
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I use blade-type ATO fuses and by simply removing the com circuit's
fuse and replacing it with a new one, the problem went away. The one
I removed ohmed out like all the others, so I suspect it was perhaps
that the fuse had dislodged itself slightly in the fuse
block. Checking the most accessible and simplest issue seems to have worked.
Thanks for all the feedbacks. David
| | - 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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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Mon Jul 16, 2007 4:11 pm Post subject: Garmin 430 transmitter problem |
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HA! Great. I figured that was it.
That darn fuse cost me a fortune to figure out.
List works again!
Mike
do not archive
[img]cid:1__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]David Abrahamson <dave(at)abrahamson.net>
[img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
To
[img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
aeroelectric-list(at)matronics.com [img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
cc
[img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
[img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
Subject
[img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
Re: Garmin 430 transmitter problem [img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img][img]cid:3__=08BBF988DF931B808f9e8a93df938(at)us.ibm.com[/img]
--> AeroElectric-List message posted by: David Abrahamson <dave(at)abrahamson.net>
I use blade-type ATO fuses and by simply removing the com circuit's
fuse and replacing it with a new one, the problem went away. The one
I removed ohmed out like all the others, so I suspect it was perhaps
that the fuse had dislodged itself slightly in the fuse
block. Checking the most accessible and simplest issue seems to have worked.
Thanks for all the feedbacks. David
=====================================
orum -
tor?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
=====================================
EB FORUMS -
tp://forums.matronics.com
=====================================
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
|
| Description: |
|
| Filesize: |
1.23 KB |
| Viewed: |
3219 Time(s) |
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105 Bytes |
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3218 Time(s) |
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| Description: |
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