Today's Message Index:
----------------------
1. 12:37 AM - Review request for RV-9 Electrical System (G3X, GTN, etc) (gfb)
2. 05:53 AM - Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Michael Lazarowicz)
3. 06:14 AM - Re: Antenna grounding (Michael Lazarowicz)
4. 06:24 AM - Re: Antenna grounding (Michael Lazarowicz)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Review request for RV-9 Electrical System (G3X, GTN, |
etc)
Initial thoughts on electrical system for my RV9, hoping to get some feedback from
you folks. I do have some questions below but please feel free to chime in
with anything else you feel is valuable.
- On the fence about some sort of avionics switch. Most of the big items installed
dont have on-off switches on them so I cant keep them off during engine start.
I understand the single point of failure problem so I have been avoiding
it but it sure would be nice.
- Safe to put both trim motors on the same breaker? The GAD27 install manual recommends
2 5A breakers but does not indicate why. Seems like a waste of a breaker
to me :)
- Any other spots I could save a breaker? I feel that Im too granular with them
but cant figure out where to trim :) Maybe Nav+Strobes, Servos+GMC, AudioPanel+GTR20?
- What is the preferred method to set up the sd-8 to come on by itself? I have
heard setting it's regulator voltage low is pretty common? What should that be
set to?
- The e-bus relay should see a peak of 20A with typical below 15A. Im considering
the B&C with the 25A heat sink?
Thanks!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457007#457007
Attachments:
http://forums.matronics.com//files/rv_9a_breaker_layout_v02_101.png
http://forums.matronics.com//files/rv_9a_electrical_diagram_v17_1_507.png
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
Hi ,
I am nearing the end of my G3X Installation. I have a G3X touch, A gr300
Com, A650, Gad27, GRT ADSB , 23 ES transponder and a grand rapids Mini as a
back up. I plan to do some "light IFR" . I purchased most everything from
StienAir and have been very happy with all their help. Garmin, on the
other hand can be problematical. Their support team is helpful and
friendly, but at the end of the day They just point to the requirements in
their manual and stick by all the listed requirements. If it was not for
Stein and his world class staff I would not have made it thru the
installation process. This site and Bob N are equally helpful. Here are
just a few things I have found that hopefully will help.
First of all the Circuit breaker requirements with the new G3X touch
system is insane. Each box or unit all seem to to require one . Thanks to
purchasing a system interconnect drawing from Stien I found some CB
savings. Specifically the auto pilot servos are on one breaker and one
switch ( not counting the disconnect switch ). I did not use a GDA27. In
the end I have 32 CB's and 6 fuses.
The whole avionics buss question is tricky with all this new stuff. Also I
have battery backup and that wiring is interesting also. Mine is set up
primarily for my EFIS and engine stuff. Hear again, I rely on Stine's
drawings to guide me.
As you probably know if you read Bob N's book the CB are there primarily to
protect the wire. I ran into one interesting case with Aerosun lights
where they wanted me to use one 15amp breaker for all three strobe lights
that will fire at the same time with a peek amp draw if 5 amps each.
Problem is that they recommend 20 gauge wire for the long runs to each
strobe. I ended up using 1 15 amp breaker but protect each long run wire
with 5 amp fuses in line. Bob thought the 15 amp breaker they recommended
was nuts, but sometimes is do not listen. My goal is to not have to change
much when I am done.
The biggest problem I had was Antenna location. Garmin has some "
guidelines/ requirements" that if you used them all you will have a tough
time locating everything on your plane . In my case the RV8 is particularly
hard. I used their 23ES remote mounted transponder. The manual says they
want a maximum of 6.5' from the unit to the transponder. Then they say
they want the unit itself no closer than 3 feet to its own antenna. You
add this to all the other requirements like Magnetometer, comm antennas
antennas, GPS and ADS-B and you will soon run into at least one conflict.
AS Stein told me. you just do the best you can and hope it all works out.
Hope this helps
On Fri, Jun 10, 2016 at 3:36 AM, gfb <fly@bappos.com> wrote:
>
> Initial thoughts on electrical system for my RV9, hoping to get some
> feedback from you folks. I do have some questions below but please feel
> free to chime in with anything else you feel is valuable.
>
> - On the fence about some sort of avionics switch. Most of the big items
> installed don=99t have on-off switches on them so I can=99t k
eep them off
> during engine start. I understand the single point of failure problem so
I
> have been avoiding it but it sure would be nice.
> - Safe to put both trim motors on the same breaker? The GAD27 install
> manual recommends 2 5A breakers but does not indicate why. Seems like a
> waste of a breaker to me :)
> - Any other spots I could save a breaker? I feel that I=99m too gra
nular
> with them but can=99t figure out where to trim :)
Maybe Nav+Strobes,
> Servos+GMC, AudioPanel+GTR20?
> - What is the preferred method to set up the sd-8 to come on by itself? I
> have heard setting it's regulator voltage low is pretty common? What shou
ld
> that be set to?
> - The e-bus relay should see a peak of 20A with typical below 15A. I
=99m
> considering the B&C with the 25A heat sink?
>
> Thanks!
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457007#457007
>
>
> Attachments:
>
> http://forums.matronics.com//files/rv_9a_breaker_layout_v02_101.png
> http://forums.matronics.com//files/rv_9a_electrical_diagram_v17_1_507.png
>
>
===========
===========
===========
===========
===========
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Antenna grounding |
Hi Bob,
It is Garmins GTX 23. I know of one installation at least where the
magnetometer is close ( about 2 feet form the antenna) and there are no
problems. That RV8 has been flying for 2 years. I will have the ability
to switch the ADSB antenna with the Transponder antenna and get it 4. 5
feet from the magnetometer. The problem is then the Transponder antenna is
less than a foot from the GTX23 unit.
After hounding Garmin about their requirement that the GTX23 box itself be
located 3 feet (not 3 feet of coax) from the transponder antenna I ended
up with the transponder antenna 3 feet away and putting the ADSB less than
a foot from the box. If it does not work out I can switch the antennas
with out too much work later.
After pressing the Garmin people one of their guys checked with the
Transponder person at Garmin and they indicated they THOUGHT what really
was required was at least 3 feet of Coax.
There is a Check that I will run on the magnetometer when it is up and
running. One with the G3X and one with PC software that Garmin gave me a
link to.
Thanks for all your help
Mike
On Thu, Jun 9, 2016 at 10:47 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> I have a weird one for you Bob. I have been struggling to mount my
> antennas the proper distance from each other and comply with other Garmin
> restrictions . After a lot of back and forth with Garmin I made sure my
> transponder antenna was three feet from the transponder as required in
> their installation manual.
>
> Which transponder are we talking about?
>
> I sent them a picture of where everything was and their tec guy said he
> was " concerned" about how close my transponder antenna is to the
> magnatomiter . The antenna in question is on the belly and is about 11
> inches below the manotomiter.
>
> There are no restrictions in the magnatomiter installation that says it
> has to be any specific distance from the transponder antenna. I know they
> are concerned about magnetism near the unit. Why would they care about the
> antenna?
>
> A transponder's output is not 'magnetic' in the
> sense that it would upset the calibration of a
> compass. However, the peak power output is on
> the order of 100 to 150 watts which CAN disturb
> the electronics associated with a magnetometer.
>
> If you're already installed, leave it and do
> flight tests to see if a transponder making
> replies to ground stations has any observable
> effect on displayed magnetic heading values.
>
> I suspect it will not but it's easy to check.
>
>
> Bob . . .
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Antenna grounding |
One other question if you cont mind. I am using RG400 for my ADSB and with
all this antenna location I may have to add about 6 " to the ADSB cable.
Its already about 12 feet long. This is just ADSB in so not transmission.
How much will I loose if I extend the cable with a interconnect fitting ?
I got into this long length because of the transponder being in the back.
Mike
On Thu, Jun 9, 2016 at 10:47 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> I have a weird one for you Bob. I have been struggling to mount my
> antennas the proper distance from each other and comply with other Garmin
> restrictions . After a lot of back and forth with Garmin I made sure my
> transponder antenna was three feet from the transponder as required in
> their installation manual.
>
> Which transponder are we talking about?
>
> I sent them a picture of where everything was and their tec guy said he
> was " concerned" about how close my transponder antenna is to the
> magnatomiter . The antenna in question is on the belly and is about 11
> inches below the manotomiter.
>
> There are no restrictions in the magnatomiter installation that says it
> has to be any specific distance from the transponder antenna. I know they
> are concerned about magnetism near the unit. Why would they care about the
> antenna?
>
> A transponder's output is not 'magnetic' in the
> sense that it would upset the calibration of a
> compass. However, the peak power output is on
> the order of 100 to 150 watts which CAN disturb
> the electronics associated with a magnetometer.
>
> If you're already installed, leave it and do
> flight tests to see if a transponder making
> replies to ground stations has any observable
> effect on displayed magnetic heading values.
>
> I suspect it will not but it's easy to check.
>
>
> Bob . . .
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|