Today's Message Index:
----------------------
1. 04:59 AM - Hall effect sensor (Glen Matejcek)
2. 05:11 AM - Re: Lost Linik for Pilot Stick Grip Switches (Mark Banus)
3. 05:47 AM - Re: Hall effect sensor (Brian Lloyd)
4. 05:42 PM - Garmin GNC300 problem (Charlie England)
5. 07:21 PM - Re: Garmin GNC300 problem (rv-9a-online)
6. 08:11 PM - Re: Rotary Switch- solution found (Robert L. Nuckolls, III)
7. 09:56 PM - Re: Avionics-List: Garmin GNC300 problem (David Lloyd)
Message 1
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| Subject: | Hall effect sensor |
--> AeroElectric-List message posted by: "Glen Matejcek" <aerobubba@earthlink.net>
Hi Brian-
Thanks for the quick reply. I get running the ground lead outside the loop
of the sensor; my concern is the proximity of the ground wire to the
sensor. Are you saying that it is irrelevant and that it would be okay for
the ground wire to actually be in contact with the outer surface of the
sensor?
Thanks again-
Glen Matejcek
aerobubba@earthlink.net
Message 2
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| Subject: | Re: Lost Linik for Pilot Stick Grip Switches |
--> AeroElectric-List message posted by: "Mark Banus" <mbanus@hotmail.com>
http://www.aeroelectric.com/articles/Pilot_Priority_B.pdf
Mark Banus
Message 3
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| Subject: | Re: Hall effect sensor |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Glen Matejcek wrote:
> --> AeroElectric-List message posted by: "Glen Matejcek" <aerobubba@earthlink.net>
>
> Hi Brian-
>
> Thanks for the quick reply. I get running the ground lead outside the loop
> of the sensor; my concern is the proximity of the ground wire to the
> sensor. Are you saying that it is irrelevant and that it would be okay for
> the ground wire to actually be in contact with the outer surface of the
> sensor?
Yes. Most hall-effect sensors place the sensor in the gap of a ferrous
metal ring. You pass the wires you want to sense through the middle of
this ring. The field around the wires then induces a corresponding
magnetic field in the ring which is what the hall-effect sensor then
measures. Anything outside that ring is, for all intents and purposes,
ignored.
So back to the short answer, yes, you can place the ground wire in
proximity. It won't have an effect unless you also run it through the
hole in the sensor.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.270.912.0788 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 4
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"avionics-list@matronics.com" <avionics-list@matronics.com>
| Subject: | Garmin GNC300 problem |
--> AeroElectric-List message posted by: Charlie England <ceengland@bellsouth.net>
Posted for a friend:
New install of Garmin GNC300. All functions seem to work normally unless
the transmit button is held for 10-15 seconds. The display will then go
dim to dark & the unit hums & groans. This continues after the transmit
button is released. If power is cycled, the unit will immediately return
to normal operation. The owner has removed the GPS antenna & has seen
no change in the symptoms.
Any thoughts??
Thanks,
Charlie
Message 5
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| Subject: | Re: Garmin GNC300 problem |
--> AeroElectric-List message posted by: rv-9a-online <rv-9a-online@telus.net>
What is the power feed to the unit... a fused circuit, a circuit breaker
or a poly fuse (Controlvision load center)?
Vern Little
Charlie England wrote:
>--> AeroElectric-List message posted by: Charlie England <ceengland@bellsouth.net>
>
>Posted for a friend:
>
>New install of Garmin GNC300. All functions seem to work normally unless
>the transmit button is held for 10-15 seconds. The display will then go
>dim to dark & the unit hums & groans. This continues after the transmit
>button is released. If power is cycled, the unit will immediately return
>to normal operation. The owner has removed the GPS antenna & has seen
>no change in the symptoms.
>
>Any thoughts??
>
>Thanks,
>
>Charlie
>
>
>
>
Message 6
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| Subject: | Re: Rotary Switch- solution found |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 10:33 AM 1/22/2005 -0600, you wrote:
>--> AeroElectric-List message posted by: jerb <ulflyer@verizon.net>
>
>Question - is this switch, switching AC or DV voltages - switches rated for
>AC normally will only handle a fraction of their current rating when
>operated in a DC application. It has to do with the type of contacts used
>in each switch, DC switches cost more to make because of the material that
>has to be used to reduce arcing when contacts break and resist welding. AC
>switches take advantage of the zero point crossing of the AC swine wave to
>reducing arching effect when contact break thus allow the use of lower cost
>materials for the contacts.
>jerb
Yeah . . . kinda sorta . . . DC vs. AC ratings of switches is
not well understood and there's a LOT of hangar lore and ol'
mechanic's tales circulating around out there. Take a look at:
http://aeroelectric.com/articles/swtchrat.pdf
Yes, there's a lot more to switch design and usage than meets
the eye. But MOST of what's circulated in OBAM aviation circles
takes good data and puts an incorrect interpretation on it.
Bob . . .
Message 7
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"aeroelectric list" <aeroelectric-list@matronics.com>
| Subject: | Re: Avionics-List: Garmin GNC300 problem |
--> AeroElectric-List message posted by: "David Lloyd" <skywagon@charter.net>
Charlie,
The transmit mode draws the most current of any mode of operation. It
sounds like the unit is being strangled for power during this time. Could
be: too small a gauge of wire used for hook-up, a bad ground, a bad circuit
breaker limiting current but not popping, a bad power supply in the new 300.
Take it back to the installer for testing. Let us know what the problem is.
David
----- Original Message -----
From: "Charlie England" <ceengland@bellsouth.net>
<avionics-list@matronics.com>
Subject: Avionics-List: Garmin GNC300 problem
> --> Avionics-List message posted by: Charlie England
> <ceengland@bellsouth.net>
>
> Posted for a friend:
>
> New install of Garmin GNC300. All functions seem to work normally unless
> the transmit button is held for 10-15 seconds. The display will then go
> dim to dark & the unit hums & groans. This continues after the transmit
> button is released. If power is cycled, the unit will immediately return
> to normal operation. The owner has removed the GPS antenna & has seen
> no change in the symptoms.
>
> Any thoughts??
>
> Thanks,
>
> Charlie
>
>
>
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