Today's Message Index:
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1. 02:01 AM - Re: Transponder antenna (Airdog77)
2. 07:00 AM - Simple EFIS backup battery wiring (Matt Stecher)
3. 01:26 PM - Re: Simple EFIS backup battery wiring (donjohnston)
4. 03:48 PM - Re: Simple EFIS backup battery wiring (user9253)
5. 04:04 PM - Re: Re: Simple EFIS backup battery wiring (Charlie England)
6. 04:56 PM - Re: z13/8 ess bus feed (Robert L. Nuckolls, III)
7. 05:02 PM - Re: Transponder antenna (donjohnston)
8. 05:32 PM - Re: Re: Transponder antenna (Charlie England)
9. 06:51 PM - Re: Transponder antenna (donjohnston)
10. 07:15 PM - Re: Re: Transponder antenna (Charlie England)
11. 07:15 PM - Re: Transponder antenna (Airdog77)
Message 1
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| Subject: | Re: Transponder antenna |
Mike,
> In a composite aircraft does the transponder antenna have to be outside the fuselage?
No, none of the antennas have to be outside the aircraft.
> If it can be inside how do you make a ground plane?
Check out the Advanced Aircraft Electronics L2 Transponder Antenna made specifically
for composite aircraft, no ground plane required and costs less than $100.
http://www.aircraftspruce.com/catalog/avpages/antennasystems1.php?clickkey=4083
> Is it OK to be close to the COM antenna?
If you mean the transponder antenna, from my understanding no. I think you want
to be as far away as possible, within reason. Different antennas may have different
requirements.
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474854#474854
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| Subject: | Simple EFIS backup battery wiring |
I need to install a small battery on my MGS Extreme so that it can be kept
up and running during engine start for my VFR 601XL.=C2-I would like to k
eep the wiring as simple as possible, but also allow the 1.2 AH battery to
be maintained by the alternator.=C2-MGL has an example that uses a diode
and switch to power the backup pin on another system, but the Extreme does
not include this.How has everyone else handled this?Thanks,Matt StecherSkyd
ive Houston Airpark
Message 3
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| Subject: | Re: Simple EFIS backup battery wiring |
I have a GRT EFIS and here's how I did mine.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474858#474858
Attachments:
http://forums.matronics.com//files/backup_battery_331.jpg
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| Subject: | Re: Simple EFIS backup battery wiring |
Here is a circuit similar to the above. A battery fuse and switch could be added
if desired.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474860#474860
Attachments:
http://forums.matronics.com//files/backup_battery_905.jpg
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| Subject: | Re: Simple EFIS backup battery wiring |
And if you want max voltage available in a simple circuit like that,
Schottky diodes are pretty cheap now. Just search ebay for lots of
options. Somewhat lower forward voltage drop than silicon.
On 11/12/2017 5:48 PM, user9253 wrote:
>
> Here is a circuit similar to the above. A battery fuse and switch could be added
if desired.
>
> --------
> Joe Gores
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| Subject: | Re: z13/8 ess bus feed |
At 05:49 PM 11/11/2017, you wrote:
>
>Hi. Building an RV7 in the UK with a G3X system and thinking of
>using the z13/8 architecture with the SD8 backup alt and GAD27 to
>maintain voltage to the GDU etc during engine start. Is it normal or
>acceptable to keep the essential bus alternate feed on during flight
>in case of battery contactor failure? I'd rather not add a second battery.
Battery contactors seldom fail in fight . . . I use
the word 'seldom' because the rate is fanishingly
small. I've never encountered such a failure.
A contactor on the edge of failure will raise caution
flags by causing fussy starts or failure to close
during start up.
Even if it does fail, you probably wouldn't know it
until the next preflight.
The airplane will continue to run on the self
excited alternator. But if you want to fly around with
the alternate feed switch closed, it doesn't hurt
anything but it's unnecessary.
Bob . . .
Message 7
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| Subject: | Re: Transponder antenna |
mike(at)vision499.com wrote:
> In a composite aircraft does the transponder antenna have to be outside the fuselage?
If your composite is fiberglass, it does not have to be on the outside. If it's
carbon fiber, then you may have some issues.
mike(at)vision499.com wrote:
>
> If it can be inside how do you make a ground plane?
I used aluminum. Here's how I built mine.
http://www.velocity-xl.com/blog/2013/11/07/13-99-transponder-antenna-ground-plane/
mike(at)vision499.com wrote:
> Is it OK to be close to the COM antenna
In a perfect world, they would be as far apart as possible. I'm sure there's a
recommended minimum. But I don't know what that is.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474866#474866
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| Subject: | Re: Transponder antenna |
That design is great for those of us who are financially challenged; you
can buy the little spike antenna for around $20. Add a bit of scrap
aluminum & you're done.
On 11/12/2017 7:02 PM, donjohnston wrote:
>
>
> mike(at)vision499.com wrote:
>> In a composite aircraft does the transponder antenna have to be outside the
fuselage?
> If your composite is fiberglass, it does not have to be on the outside. If it's
carbon fiber, then you may have some issues.
>
>
> mike(at)vision499.com wrote:
>> If it can be inside how do you make a ground plane?
> I used aluminum. Here's how I built mine.
> http://www.velocity-xl.com/blog/2013/11/07/13-99-transponder-antenna-ground-plane/
>
>
> mike(at)vision499.com wrote:
>> Is it OK to be close to the COM antenna
> In a perfect world, they would be as far apart as possible. I'm sure there's
a recommended minimum. But I don't know what that is.
>
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Message 9
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| Subject: | Re: Transponder antenna |
ceengland7(at)gmail.com wrote:
> That design is great for those of us who are financially challenged; you
> can buy the little spike antenna for around $20. Add a bit of scrap
> aluminum & you're done.
Not sure about the "financially challenged" comment. I didn't see the benefit to
spending $100's on something that I could build for about $25.
If that makes me "Financially challenged" then so be it.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474871#474871
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| Subject: | Re: Transponder antenna |
An earlier post mentioned a dipole for ~$100.00. The $20+aluminum scrap
is the alternative for us 'financially challenged'. When I wrote 'That
design', I was referring to the spike.
On 11/12/2017 8:50 PM, donjohnston wrote:
>
>
> ceengland7(at)gmail.com wrote:
>> That design is great for those of us who are financially challenged; you
>> can buy the little spike antenna for around $20. Add a bit of scrap
>> aluminum & you're done.
>
> Not sure about the "financially challenged" comment. I didn't see the benefit
to spending $100's on something that I could build for about $25.
>
> If that makes me "Financially challenged" then so be it.
>
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Message 11
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| Subject: | Re: Transponder antenna |
> If your composite is fiberglass, it does not have to be on the outside. If it's
carbon fiber, then you may have some issues.
Good point. I should have noted the carbon fiber caveat.
I went the same way you did initially Don, and it is fairly easy and cost effective.
But then after I ran across a few builders who used the L2, it solved my
issue of finding a location for mounting the antenna, and also kept from having
anything poking out (for us non-CF folks!).
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474872#474872
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