Today's Message Index:
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1. 08:06 AM - Re: Garmin GTX 335 Install nonsense(?) (rampil)
2. 10:22 AM - Battery charging (Steve Kelly)
3. 12:02 PM - Re: Battery charging (user9253)
Message 1
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| Subject: | Re: Garmin GTX 335 Install nonsense(?) |
First, and most important, and Im sure you know that TSO installation instructions
do not apply to you.
Theoretically, the benefit of ground planes increases with size, in the limit,
a ground (surface of the earth) antenna ground plane which is the entire earth
is optimal. However the benefit decreases exponentially with size. Modern "active"
gps antennae have a ground plane which is a fraction of an inch on a side
and they are designed to work just fine. It does have a ground plane, it is
just encapsulated inside that plastic lump. Transponder transmitter antennae
have slightly more critical requirements to optimize impedance load and transmission
pattern. If your transponder performance was OK with existing antenna,
it will almost certainly work with the new one.
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Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=459263#459263
Message 2
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| Subject: | Battery charging |
I have a small 9ah sealed lead-acid battery in the back of my plane that I use
mainly to operate some things on the ground without having to use the main battery
which is on the firewall. It is also available, should I need it in flight
to power a few items such as the com or the flight display.
This battery feeds buss #2 with a #14 wire, again coming from the back of the
plane.
I have been charging this with a battery charger, but would like to be able to
charge it off the main buss when the engine is running.
My thoughts are to run another wire back to the battery from the main buss with
a diode and a resistor of some sort to limit the current so the wire (or fuse)
doesn't burn up. Am I on the right track here?
I have some 3A diodes here and hopefully can use a #20 wire. No idea what to
use for a resistor value or if this would even work.
I would appreciate any feedback on this idea.
Thanks, Steve
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Steve
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http://forums.matronics.com/viewtopic.php?p=459270#459270
Message 3
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| Subject: | Re: Battery charging |
How about connecting buss #1 & #2 together with a DSS 2x121-0045B Schottky diode?
Doing that will be electrically the same as your proposal, except that the wire
will be shorter and no additional fuse or resistor is used.
It is unlikely that the fuse protecting the existing 14 AWG wire will ever blow
from charging current, unless the aux battery is completely run down or defective.
Have you ever seen the aux battery charging current go above 15 amps?
The diode will drop about 0.3 to 0.35 volts at your intended load current.
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Joe Gores
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http://forums.matronics.com/viewtopic.php?p=459274#459274
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