Today's Message Index:
----------------------
1. 12:36 PM - Re: Re: Returned Mail: Re: Grounding Tabs (Michael Lazarowicz)
2. 03:59 PM - Ground power supplies DIY (Jeffrey W. Skiba)
3. 04:34 PM - Re: Ground power supplies DIY (Daniel Hooper)
4. 05:19 PM - Re: Ground power supplies DIY (Charlie England)
5. 06:08 PM - Re: Ground power supplies DIY (Jeffrey W. Skiba)
6. 06:30 PM - Re: Ground power supplies DIY (Daniel Hooper)
7. 06:34 PM - Re: Ground power supplies DIY (David Lloyd)
8. 07:31 PM - Re: Ground power supplies DIY (Charlie England)
9. 08:07 PM - Re: Ground power supplies DIY (jim)
Message 1
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| Subject: | Re: Returned Mail: Re: Grounding Tabs |
Thanks Bob. I will use the Forest of Tabs. Like I said in previous post.
It is not Practical in the RV 8 to locate the forest on the firewall so it
will be mounted on the bulkhead behind the panel ( Isolated from that thin
bulkhead and I will ground everything I can to those tabs. I will use a #6
wire to connect that to the firewall/batter/engine strap bolt. I guess my
confusion is Z-15 Shows all " panel grounds " in one place and all
firewall grounds in another. I just wondered if by sharing that #6 wire to
the firewall I would cause a problem?
Thanks for your patience
On Sun, Jan 10, 2016 at 6:55 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 04:35 PM 1/10/2016, you wrote:
>
> I have read Bob's reply.=C3=82 It raises another question.=C3=82 If I w
ere to use
> B&C forest of tabs to ground everything.=C3=82 Flap motor , P. Heat,=C3
=82 strobes,
> interior lights and all the panel stuff like coms, audio panel etc.=C3=82
would
> that cause a ground loop.
>
>
> No . . . the "ideal" single point ground philosophy
> says take EVERYTHING to one place . . . except for
> the simplest of small airplanes, this is impractical.
>
> As shown in the Z-15 figures, collect all panel grounds
> (potential victims) to one place, all airframe grounds
> to firewall as practical . . . or ground locally as
> convenience dictates.
>
> For plastic airplanes, then -A- you DO gather airframe grounds to
> the firewall and -B- take an extension wire from
> the panel ground down to the firewall.
>
> Bob . . .
>
Message 2
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| Subject: | Ground power supplies DIY |
T2theSBzbyBJIGFtIHRyeWluZyB0byBjcmVhdGUgYSBHcm91bmQgcG93ZXIgc3VwcGx5IGZvciBh
IGxvdyBjb3N0IGFuZCBmb3VuZCBpdGVtcyBsaWtlIHRoaXMgb24gZWJheQ0KSGlnaCBRdWFsaXR5
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IHRoaW5ncykNCg0KDQpUaGFua3MNCkplZmYuDQo
Message 3
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| Subject: | Re: Ground power supplies DIY |
I do not see a UL listing label anywhere. Buyer beware, safety not
guaranteed!
> On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba <jskiba@icosa.net>
wrote:
>
> Okay so I am trying to create a Ground power supply for a low cost and
found items like this on ebay
> High Quality Universal Regulated Switching Power Supply for CCTV-12V
30A DC 360w
>
http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-S
upply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEAA
OSw~otWc4iO
<http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-
Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEA
AOSw~otWc4iO>
>
> Question is would something like this be okay to supply modern
aircraft avionics power via the ground power jack ?
>
> I mean it supplies 30amps of power from either 110v or 230v (via
switch selection)
>
> So why are pre made aircraft power supplies so expensive ??
>
> What am I missing or should I not do ??? Should I be looking for a
different type of power supply ?
>
> I really want to use it to sit in the aircraft and config all the
avionics (battery will be connected but that can get drained after a few
hours with everything on and no alternator Turing to power things)
>
>
> Thanks
> Jeff.
Message 4
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| Subject: | Re: Ground power supplies DIY |
That's probably something to at least check, if you do purchase it. You
should be able to check for safety with an ohm meter. Just check from
each low voltage terminal to every line level terminal to be sure it's
transformer-isolated.
Other than that, I'd probably go for it. The hotdog aviation supplies
may be set up to run at 14 volts instead of 12, to mimic actual
operating voltage with the alternator online, but that's not
significant. After all, if your alternator quits, your electronics will
still need to operate on battery-only.
If you don't need to run your entire panel for hours at a time, you can
achieve the same thing with a cheap 12V SLA battery and a fully
automatic trickle charger. If you already have both on hand, you
wouldn't need to buy anything but hookup bits & pieces.
Charlie
On 1/11/2016 6:32 PM, Daniel Hooper wrote:
> I do not see a UL listing label anywhere. Buyer beware, safety not
> guaranteed!
>
>> On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba <jskiba@icosa.net
>> <mailto:jskiba@icosa.net>> wrote:
>>
>> Okay so I am trying to create a Ground power supply for a low cost
>> and found items like this on ebay
>> High Quality Universal Regulated Switching Power Supply for CCTV-12V
>> 30A DC 360w
>> http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEAAOSw~otWc4iO
>> <http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:%7EEEAAOSw%7EotWc4iO>
>> Question is would something like this be okay to supply modern
>> aircraft avionics power via the ground power jack ?
>> I mean it supplies 30amps of power from either 110v or 230v (via
>> switch selection)
>> So why are pre made aircraft power supplies so expensive ??
>> What am I missing or should I not do ??? Should I be looking for a
>> different type of power supply ?
>> I really want to use it to sit in the aircraft and config all the
>> avionics (battery will be connected but that can get drained after a
>> few hours with everything on and no alternator Turing to power things)
>> Thanks
>> Jeff.
>
Message 5
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| Subject: | Ground power supplies DIY |
So what's the difference of using one of these ?
http://www.amazon.com/Schumacher-SE-1275A-Automatic-Onboard-Battery/dp/B000
BO8TTY
I have one already could I just connect it to external power plug and be go
od to go (the battery is still on line) is it not as clean for power output
? (granted it's really only 12amps)
Subject: Re: AeroElectric-List: Ground power supplies DIY
That's probably something to at least check, if you do purchase it. You sho
uld be able to check for safety with an ohm meter. Just check from each low
voltage terminal to every line level terminal to be sure it's transformer-
isolated.
Other than that, I'd probably go for it. The hotdog aviation supplies may b
e set up to run at 14 volts instead of 12, to mimic actual operating voltag
e with the alternator online, but that's not significant. After all, if you
r alternator quits, your electronics will still need to operate on battery-
only.
If you don't need to run your entire panel for hours at a time, you can ach
ieve the same thing with a cheap 12V SLA battery and a fully automatic tric
kle charger. If you already have both on hand, you wouldn't need to buy any
thing but hookup bits & pieces.
Charlie
On 1/11/2016 6:32 PM, Daniel Hooper wrote:
I do not see a UL listing label anywhere. Buyer beware, safety not guarante
ed!
On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba <jskiba@icosa.net<mailto:jski
ba@icosa.net>> wrote:
Okay so I am trying to create a Ground power supply for a low cost and foun
d items like this on ebay
High Quality Universal Regulated Switching Power Supply for CCTV-12V 30A DC
360w
http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Su
pply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEAAOS
w~otWc4iO
Question is would something like this be okay to supply modern aircraft avi
onics power via the ground power jack ?
I mean it supplies 30amps of power from either 110v or 230v (via switch sel
ection)
So why are pre made aircraft power supplies so expensive ??
What am I missing or should I not do ??? Should I be looking for a differen
t type of power supply ?
I really want to use it to sit in the aircraft and config all the avionics
(battery will be connected but that can get drained after a few hours with
everything on and no alternator Turing to power things)
Thanks
Jeff.
Message 6
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| Subject: | Re: Ground power supplies DIY |
> On Jan 11, 2016, at 7:15 PM, Charlie England <ceengland7@gmail.com>
wrote:
>
> That's probably something to at least check, if you do purchase it.
You should be able to check for safety with an ohm meter. Just check
from each low voltage terminal to every line level terminal to be sure
it's transformer-isolated.
That is is isolated is virtually guaranteed. The question is whether it
will stay that way!
The UL requirements and tests ensure that it both will not pose a fire
hazard and it will be electrically isolated from the line during
reasonable use and *throughout the life of the product*.
Basically without the UL listing, there=92s no verifiable way to know
just what you=92re getting.
Message 7
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| Subject: | Re: Ground power supplies DIY |
I purchased one like this from eBay a couple of years ago. The PS comes fr
om China.
It does as it is advertized to do and is well made, or at least the one I h
ave.
My 185 has a ground power jack box built in near the battery. I use it for
running the panel when doing adjustments, etc. to the avionics.
I used some medium heavy duty alligator clips to connect to my heavy duty p
lugs. You great care in connecting this way so you don't create a short.
Or, if you don't mind spending lots of $$, buy a set of the mating jack/plu
gs for that external jumper junctions. A lot safer. . .
My unit came with no instructions nor data other than its rating.
You may have to figure out what terminals on the terminal board go to "wher
e".
The PS also needs to be turned on before connection to the aircraft, like a
ny bench "style" unit.
The regulated output DC voltage is set via a small pot adjustment. So use
a V meter to get the output set about right and then, after connection, you
may have to tweak the pot a tad to get the voltage you need. It will hold
that voltage very well up to its max current rating.
If the PS is the same/similar to the one I have it is a heck of a deal for
powering up the avionics panel.
Dave
---------------------------------------------------------------------------
-----
----- Original Message -----
From: Charlie England
To: aeroelectric-list@matronics.com
Sent: Monday, January 11, 2016 5:15 PM
Subject: Re: AeroElectric-List: Ground power supplies DIY
That's probably something to at least check, if you do purchase it. You s
hould be able to check for safety with an ohm meter. Just check from each l
ow voltage terminal to every line level terminal to be sure it's transforme
r-isolated.
Other than that, I'd probably go for it. The hotdog aviation supplies may
be set up to run at 14 volts instead of 12, to mimic actual operating volt
age with the alternator online, but that's not significant. After all, if y
our alternator quits, your electronics will still need to operate on batter
y-only.
If you don't need to run your entire panel for hours at a time, you can a
chieve the same thing with a cheap 12V SLA battery and a fully automatic tr
ickle charger. If you already have both on hand, you wouldn't need to buy a
nything but hookup bits & pieces.
Charlie
On 1/11/2016 6:32 PM, Daniel Hooper wrote:
I do not see a UL listing label anywhere. Buyer beware, safety not guar
anteed!
On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba <jskiba@icosa.net> wrot
e:
Okay so I am trying to create a Ground power supply for a low cost an
d found items like this on ebay
High Quality Universal Regulated Switching Power Supply for CCTV-12V
30A DC 360w
http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Po
wer-Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~
EEAAOSw~otWc4iO
Question is would something like this be okay to supply modern aircra
ft avionics power via the ground power jack ?
I mean it supplies 30amps of power from either 110v or 230v (via swit
ch selection)
So why are pre made aircraft power supplies so expensive ??
What am I missing or should I not do ??? Should I be looking for a di
fferent type of power supply ?
I really want to use it to sit in the aircraft and config all the avi
onics (battery will be connected but that can get drained after a few hours
with everything on and no alternator Turing to power things)
Thanks
Jeff.
---
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Message 8
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| Subject: | Re: Ground power supplies DIY |
I'd certainly try it out. You might try some sort of inexpensive 12V
audio device first, to see how noisy it is.
Even if it's too noisy, you can still run battery only for quite a
while, then recharge between sessions.
On 1/11/2016 8:04 PM, Jeffrey W. Skiba wrote:
>
> So whats the difference of using one of these ?
>
> http://www.amazon.com/Schumacher-SE-1275A-Automatic-Onboard-Battery/dp/B000BO8TTY
>
> I have one already could I just connect it to external power plug and
> be good to go (the battery is still on line) is it not as clean for
> power output ? (granted its really only 12amps)
>
> *Subject:*Re: AeroElectric-List: Ground power supplies DIY
>
> That's probably something to at least check, if you do purchase it.
> You should be able to check for safety with an ohm meter. Just check
> from each low voltage terminal to every line level terminal to be sure
> it's transformer-isolated.
>
> Other than that, I'd probably go for it. The hotdog aviation supplies
> may be set up to run at 14 volts instead of 12, to mimic actual
> operating voltage with the alternator online, but that's not
> significant. After all, if your alternator quits, your electronics
> will still need to operate on battery-only.
>
> If you don't need to run your entire panel for hours at a time, you
> can achieve the same thing with a cheap 12V SLA battery and a fully
> automatic trickle charger. If you already have both on hand, you
> wouldn't need to buy anything but hookup bits & pieces.
>
> Charlie
>
> On 1/11/2016 6:32 PM, Daniel Hooper wrote:
>
> I do not see a UL listing label anywhere. Buyer beware, safety not
> guaranteed!
>
> On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba
> <jskiba@icosa.net <mailto:jskiba@icosa.net>> wrote:
>
> Okay so I am trying to create a Ground power supply for a low
> cost and found items like this on ebay
>
> High Quality Universal Regulated Switching Power Supply for
> CCTV-12V 30A DC 360w
>
> http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEAAOSw~otWc4iO
> <http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Supply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:%7EEEAAOSw%7EotWc4iO>
>
> Question is would something like this be okay to supply modern
> aircraft avionics power via the ground power jack ?
>
> I mean it supplies 30amps of power from either 110v or 230v
> (via switch selection)
>
> So why are pre made aircraft power supplies so expensive ??
>
> What am I missing or should I not do ??? Should I be looking
> for a different type of power supply ?
>
> I really want to use it to sit in the aircraft and config all
> the avionics (battery will be connected but that can get
> drained after a few hours with everything on and no alternator
> Turing to power things)
>
> Thanks
>
> Jeff.
>
Message 9
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| Subject: | Ground power supplies DIY |
Power supplies have several different types of ratings, and most have no
overvoltage protection in case the power supply regulator fails.
One of the ratings is how much current (Amps) will it provide while
maintaining the rated voltage.
Ripple is a rating about how much the voltage is allowed to fluctuate while
providing current. The fluctuation is normally at about 60 Hz (cycles per
second) for older designs, however, the modern switching type power supplies
may have ripple at many different frequencies that may or may not show up as
a humming noise on radios, etc.
Some have voltage adjustments, some don't. If you get an adjustable one and
it is inadvertently turned up too high, it can fill your airplane with very
expensive smoke in short order. Too low of a voltage can also cause some
serious problems with SOME avionics.
The old adage LET THE BUYER BEWARE is very appropriate here. An attempt to
save money might be extremely expensive.
Jim
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of David
Lloyd
Sent: Monday, January 11, 2016 8:24 PM
Subject: Re: AeroElectric-List: Ground power supplies DIY
I purchased one like this from eBay a couple of years ago. The PS comes
from China.
It does as it is advertized to do and is well made, or at least the one I
have.
My 185 has a ground power jack box built in near the battery. I use it for
running the panel when doing adjustments, etc. to the avionics.
I used some medium heavy duty alligator clips to connect to my heavy duty
plugs. You great care in connecting this way so you don't create a short.
Or, if you don't mind spending lots of $$, buy a set of the mating
jack/plugs for that external jumper junctions. A lot safer. . .
My unit came with no instructions nor data other than its rating.
You may have to figure out what terminals on the terminal board go to
"where".
The PS also needs to be turned on before connection to the aircraft, like
any bench "style" unit.
The regulated output DC voltage is set via a small pot adjustment. So use a
V meter to get the output set about right and then, after connection, you
may have to tweak the pot a tad to get the voltage you need. It will hold
that voltage very well up to its max current rating.
If the PS is the same/similar to the one I have it is a heck of a deal for
powering up the avionics panel.
Dave
_____
----- Original Message -----
From: Charlie England <mailto:ceengland7@gmail.com>
Sent: Monday, January 11, 2016 5:15 PM
Subject: Re: AeroElectric-List: Ground power supplies DIY
That's probably something to at least check, if you do purchase it. You
should be able to check for safety with an ohm meter. Just check from each
low voltage terminal to every line level terminal to be sure it's
transformer-isolated.
Other than that, I'd probably go for it. The hotdog aviation supplies may be
set up to run at 14 volts instead of 12, to mimic actual operating voltage
with the alternator online, but that's not significant. After all, if your
alternator quits, your electronics will still need to operate on
battery-only.
If you don't need to run your entire panel for hours at a time, you can
achieve the same thing with a cheap 12V SLA battery and a fully automatic
trickle charger. If you already have both on hand, you wouldn't need to buy
anything but hookup bits & pieces.
Charlie
On 1/11/2016 6:32 PM, Daniel Hooper wrote:
I do not see a UL listing label anywhere. Buyer beware, safety not
guaranteed!
On Jan 11, 2016, at 5:56 PM, Jeffrey W. Skiba <jskiba@icosa.net
<mailto:jskiba@icosa.net> > wrote:
Okay so I am trying to create a Ground power supply for a low cost and found
items like this on ebay
High Quality Universal Regulated Switching Power Supply for CCTV-12V 30A DC
360w
http://www.ebay.com/itm/High-Quality-Universal-Regulated-Switching-Power-Sup
ply-for-CCTV-12V-30A-DC-360w-/331735582614?hash=item4d3cfb4796:g:~EEAAOSw~ot
Wc4iO
Question is would something like this be okay to supply modern aircraft
avionics power via the ground power jack ?
I mean it supplies 30amps of power from either 110v or 230v (via switch
selection)
So why are pre made aircraft power supplies so expensive ??
What am I missing or should I not do ??? Should I be looking for a different
type of power supply ?
I really want to use it to sit in the aircraft and config all the avionics
(battery will be connected but that can get drained after a few hours with
everything on and no alternator Turing to power things)
Thanks
Jeff.
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