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Randy.McFarland(at)novell
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 Posted: Wed Feb 18, 2009 6:16 pm Post subject: odd TX problem |
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I have 240 hrs on an RV7A experimental.
Just developed an interesting problem. When I transmit on mt Garmin 430 it momentarily turns the Garmin 327 transponder Off. Then 327 will come back on until the next time I key the Mic again.
Help, Ideas, wild ass guesses?
Randy
---
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Bret Smith
Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA
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| Posted: Wed Feb 18, 2009 6:46 pm Post subject: odd TX problem |
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The 430 is drawing 10A when transmitting, drawing down the bus voltage enough to "kill" the transponder. Verify your alternator is putting out full power.
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of McFarland, Randy
Sent: Wednesday, February 18, 2009 9:13 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: odd TX problem
I have 240 hrs on an RV7A experimental.
Just developed an interesting problem. When I transmit on mt Garmin 430 it momentarily turns the Garmin 327 transponder Off. Then 327 will come back on until the next time I key the Mic again.
Help, Ideas, wild ass guesses?
Randy
----- Original Message -----
From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com>
To: aeroelectric-list(at)matronics.com <aeroelectric-list(at)matronics.com>
Sent: Wed Feb 18 11:12:05 2009
Subject: Re: LED Strobes & FAR Requirements
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net>
Paul,
I wrote up a paper on this some years ago:
www.PerihelionDesign.com/downloads/aircraft_beacons_using_leds.pdf
But beware--I have some work to do on this. At the time LEDs could not quite do the job. They can now. So my conclusion needs revision and I am adding and revising some other details. The power and angle stuff is correct.
"...Beans for supper tonight, six o'clock.
Navy beans cooked in Oklahoma ham...
Got to eat 'em with a spoon, raw onions
and cornbread; nothing else...."
--Will Rogers
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=230863#230863
http://www.nbsp; the Web href="http://forums.matronics.com">http://forums.matronics.com
_p; generous bsp; href="http://www.matronics.com/contribution">http://www.matronics.com/c=================
��~��,g�� [quote][b]
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_________________
Bret Smith
RV-9A (Emp) |
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simon(at)synchdes.com
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| Posted: Wed Feb 18, 2009 7:18 pm Post subject: odd TX problem |
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Even so, the battery should fill in the gap. Assuming the engine is running and both sources are available, I bet there is a high resistance somewhere. By high resistance, I mean a half Ohm or so in the wiring or connections.
Simon Ramirez
Copyright 2009
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Bret Smith
Sent: Wednesday, February 18, 2009 9:43 PM
To: aeroelectric-list(at)matronics.com
Subject: RE: Re: odd TX problem
The 430 is drawing 10A when transmitting, drawing down the bus voltage enough to "kill" the transponder. Verify your alternator is putting out full power.
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of McFarland, Randy
Sent: Wednesday, February 18, 2009 9:13 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: odd TX problem
I have 240 hrs on an RV7A experimental.
Just developed an interesting problem. When I transmit on mt Garmin 430 it momentarily turns the Garmin 327 transponder Off. Then 327 will come back on until the next time I key the Mic again.
Help, Ideas, wild ass guesses?
Randy
---
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BobsV35B(at)aol.com
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| Posted: Wed Feb 18, 2009 7:21 pm Post subject: odd TX problem |
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Good Evening Brett,
I am certainly no electronics expert, but I do have a lot of experience using transmitters when the generator is not putting out any power at all.
Since the transmitting load is an intermittent load, it is not even required to be considered when we figure whether or not the generator/alternator is of an adequate size to use in our airplanes. For loads like transmitting, actuating the landing gear, operating electric flaps, or even a landing light, the idea is that the battery should be able to carry all of those intermittent loads. If the voltage is going so low that it knocks the Transponder off the line when the transmitter is keyed, there is something wrong beyond a small or under performing alternator.
Happy Skies
Old Bob
AKA
Bob Siegfried
Ancient Aviator
628 West 86th Street
Downers Grove, IL 60516
630 985-8502
Stearman N3977A
Brookeridge Air Park LL22
In a message dated 2/18/2009 8:47:26 P.M. Central Standard Time, smithhb(at)tds.net writes:
| Quote: | The 430 is drawing 10A when transmitting, drawing down the bus voltage enough to "kill" the transponder. Verify your alternator is putting out full power.
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of McFarland, Randy
Sent: Wednesday, February 18, 2009 9:13 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: odd TX problem
I have 240 hrs on an RV7A experimental.
Just developed an interesting problem. When I transmit on mt Garmin 430 it momentarily turns the Garmin 327 transponder Off. Then 327 will come back on until the next time I key the Mic again.
Help, Ideas, wild ass guesses?
Randy
----- Original Message -----
From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com>
To: aeroelectric-list(at)matronics.com <aeroelectric-list(at)matronics.com>
Sent: Wed Feb 18 11:12:05 2009
Subject: Re: LED Strobes & FAR Requirements
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net>
Paul,
I wrote up a paper on this some years ago:
www.PerihelionDesign.com/downloads/aircraft_beacons_using_leds.pdf
But beware--I have some work to do on this. At the time LEDs could not quite do the job. They can now. So my conclusion needs revision and I am adding and revising some other details. The power and angle stuff is correct.
"...Beans for supper tonight, six o'clock.
Navy beans cooked in Oklahoma ham...
Got to eat 'em with a spoon, raw onions
and cornbread; nothing else...."
--Will Rogers
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=230863#230863
http://www.nbsp; the Web href="http://forums.matronics.com">http://forums.matronics.com
_p; generous bsp; href="http://www.matronics.com/contribution">http://www.matronics.com/c=================
��~��,g�� | Quote: |
st href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
.matronics.com/">http://forums.matronics.com
://www.matronics.com/contribution">http://www.matronics.com/contribution
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mlas(at)cox.net
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| Posted: Thu Feb 19, 2009 7:23 am Post subject: odd TX problem |
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Brent,
First go direct to the supply side of the CB and check the line voltage while transmititng using the negative thermal of the battery as you ground. If the voltage is being pulled low (more then a 1/2 a volt) you have resistance on the bus somewhere. Next do the same thing at the battery. IF you are still pulling the voltage at the battery, you have a bad battery. A 10 amp draw should not pull the battery down more then .5 volts. If the line voltage is good start checking your ground bus. This is a good place to start.
Mike Larkin
On Feb 18, 2009, at 7:43 PM, Bret Smith wrote:
[quote] The 430 is drawing 10A when transmitting, drawing down the bus voltage enough to "kill" the transponder. Verify your alternator is putting out full power.
Bret Smith
RV-9A N16BL
Blue Ridge, Ga
www.FlightInnovations.com
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of McFarland, Randy
Sent: Wednesday, February 18, 2009 9:13 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: Re: odd TX problem
I have 240 hrs on an RV7A experimental.
Just developed an interesting problem. When I transmit on mt Garmin 430 it momentarily turns the Garmin 327 transponder Off. Then 327 will come back on until the next time I key the Mic again.
Help, Ideas, wild ass guesses?
Randy
---
| | - 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 |
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