Today's Message Index:
----------------------
1. 02:53 AM - Re: bench power (bobnoffs)
2. 07:57 AM - Rectifier/Regulator (Charles Davis)
3. 08:44 AM - Re: Rectifier/Regulator (Robert L. Nuckolls, III)
4. 10:30 AM - Re: Rectifier/Regulator (rparigoris)
5. 10:50 AM - Re: Rectifier/Regulator (user9253)
6. 10:54 AM - Some Thoughts on Z101 (Eric Page)
7. 11:26 AM - Re: Rectifier/Regulator (user9253)
8. 02:37 PM - Coax Mixing RG-400 and RG58 (Jared Yates)
9. 02:47 PM - Re: Coax Mixing RG-400 and RG58 (Charlie England)
10. 03:31 PM - Re: Some Thoughts on Z101 (user9253)
11. 04:06 PM - Re: Coax Mixing RG-400 and RG58 (Kelly McMullen)
12. 05:25 PM - Re: Coax Mixing RG-400 and RG58 (user9253)
13. 06:36 PM - Re: Coax Mixing RG-400 and RG58 (Robert L. Nuckolls, III)
14. 06:54 PM - Re: Some Thoughts on Z101 (Robert L. Nuckolls, III)
15. 06:57 PM - Re: Some Thoughts on Z101 (Robert L. Nuckolls, III)
16. 07:23 PM - Re: Some Thoughts on Z101 (Sebastien)
Message 1
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thanks for the input. i plan to put a cig. lighter plug on output of the power
source. my rv12 is wired to easily handle current for one source at a time thru
the cig. plug.
instead of the mapbox, when i open the door on the panel my fuse panel is right
there. i will keep the fuse panel empty [ field wire] except for what i am working
on.
if i never need a lower voltage from the power supply i can run it thru a bucks
regulator which i have.
usually i don't know what i don't know about electricity.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500426#500426
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| Subject: | Rectifier/Regulator |
greetings, all
Does anyone recognize this rectifier/regulator ?
It was given to me for my project (Was in a Rotax-powered plane which
was destroyed, and I am busy installing a 912)
Only 2 of the three yellow wires were connected - I assume they were
/are for a 3-phase alternator, whereas the rotax only has 2 wires from
the alternator coils ...
The 2 red and 2 green are terminated in a 2-pin male and a 2-pin female
molex-type connector - I assume they are +ve and -ve to the battery
the 2 white wires in the pic are a 20,000 uF cap, 25v
Can I test the functionality by supplying 9v, 50Hz from an isolation
transformer, and connect the red/green pairs to a gel 12v battery ?
There are no markings or numbers of any sort on the unit
What would be the simplest way to have a charging/not charging
indication - an idiot-light would be my preferance
Charles
Message 3
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| Subject: | Re: Rectifier/Regulator |
At 09:56 AM 1/27/2021, you wrote:
>greetings, all
>
>Does anyone recognize this rectifier/regulator ?
>
>It was given to me for my project (Was in a Rotax-powered plane
>which was destroyed, and I am busy installing a 912)
>
>Only 2 of the three yellow wires were connected - I assume they were
>/are for a 3-phase alternator, whereas the rotax only has 2 wires
>from the alternator coils ...
>
>The 2 red and 2 green are terminated in a 2-pin male and a 2-pin
>female molex-type connector - I assume they are +ve and -ve to the battery
>
>the 2 white wires in the pic are a 20,000 uF cap, 25v
>
>Can I test the functionality by supplying 9v, 50Hz from an isolation
>transformer, and connect the red/green pairs to a gel 12v battery ?
>
>There are no markings or numbers of any sort on the unit
>
>What would be the simplest way to have a charging/not charging
>indication - an idiot-light would be my preferance
>
>Charles
Low voltage warning light is the PRIMARY
function monitor in the simple electrical
system. Voltage above 13.5, alternator MUST
be working . . . light OFF. Voltage below
13.5; alternator is not working . . . light
flashing.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 4
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| Subject: | Re: Rectifier/Regulator |
Hi Charles
It kinda looks like a Silent: https://www.silent-hektik.de/UL_R_912.htm
Sorry I don't know too much about the unit. You may be able to obtain what you
need if you translate page? I believe Vans Aircraft now sells them for their RVs,
perhaps you can see if they can help? On my 914 I'm using a B&C AVC1. Ron
P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500430#500430
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| Subject: | Re: Rectifier/Regulator |
Charles, is your alternator a single phase permanent magnet type? If so, buy a
new AM101406 regulator from eBay for $19 and free shipping. Mount it with
heat conductive paste and keep it cool with an air blast tube. That is what I
did and it has lasted 4 years so far. The wires in your picture look heat
damaged where they enter the case. Your old one can not be tested with 9
volts. A 16 volt transformer might work. But why bother when a new is inexpensive?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500431#500431
Message 6
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| Subject: | Some Thoughts on Z101 |
I'm starting to sneak up on wiring my Kitfox project, so I've been looking over
Z101 in detail. Take a look at this idea to simplify the Brown-Out Booster and
AUX BUS Normal Feed path, and tell me if I'm out to lunch:
Z101, for reference: https://tinyurl.com/1120mgeh
1. Delete the AUX BUS normal feed path from the bridge rectifier.
2. Remove the Brown-Out Booster input feed from the Engine Start pushbutton switch,
and instead connect it directly to the Battery Contactor with a short-as-practical
14AWG wire.
3. Remove the output of the Brown-Out Booster from the normally-closed contact
of the AUX BUS Alternate Feed Relay, and instead connect it to the AUX BUS normal
feed point that was previously supplied by the bridge rectifier, again with
a short-as-practical 14AWG wire.
Since the DC-to-DC boost topology (see attached image) offers no barrier to forward
current flow, it can pass normal feed current for the AUX BUS even when it
isn't needed for boost duty. Its rectifier will prevent backfeed from the AUX
BUS to the MAIN BUS in the event that the AUX BUS Alternate Feed Relay is closed.
If the Brown-Out Booster's output is set to 12V, then its controller IC
will simply stop switching any time its output voltage exceeds that value.
During engine start, the controller IC will already be "awake" and will start
switching the instant its input sags to one diode drop above 12V.
A few issues that I'm still mulling over:
1. This proposal assumes that the Brown-Out Booster is tested to ensure that its
inductor and rectifier can continuously pass full running current for the AUX
BUS, and any later additions to the AUX BUS will have to be considered with
this limitation in mind.
2. Is it acceptable -- or even a good idea -- to connect a Brown-Out Booster directly
to the Battery Contactor with no fuse, as if it were integral to the AUX
BUS?
3. If the answer to #2 is no, then does it make sense to fuse the Brown-Out Booster/AUX
BUS Normal Feed, and if so, at what value? This is complicated by the
fact that Booster input current increases faster than output current, and it
also increases as input voltage decreases.
Thoughts?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500432#500432
Attachments:
http://forums.matronics.com//files/simplified_boost_topology_619.jpg
Message 7
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| Subject: | Re: Rectifier/Regulator |
If you install an AM101406, connect as follows:
B+ goes to the main power bus through a 30 amp fuse.
The AC terminals connect to the dynamo.
Terminal "L" is for an indicator lamp.
IGW gets battery power through a switch labeled "Alternator".
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500433#500433
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| Subject: | Coax Mixing RG-400 and RG58 |
My hangar neighbor's airplane already has rg58 for the transponder antenna,
but it is 15 inches short. I happen to have a piece that would fix it, bit
it is RG400. Is there any problem running the two different types of cable
in the same feed? Do we need to try and round up a piece of RG58 instead?
Message 9
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| Subject: | Re: Coax Mixing RG-400 and RG58 |
Same impedance, so I know that *I'd* certainly try it (using the proper
connectors), before ordering a 2' jumper or re-running the whole thing.
Worst case scenario would be ATC telling you it isn't working.
Charlie
On Wed, Jan 27, 2021 at 4:42 PM Jared Yates <email@jaredyates.com> wrote:
> My hangar neighbor's airplane already has rg58 for the transponder
> antenna, but it is 15 inches short. I happen to have a piece that would fix
> it, bit it is RG400. Is there any problem running the two different types
> of cable in the same feed? Do we need to try and round up a piece of RG58
> instead?
>
Message 10
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| Subject: | Re: Some Thoughts on Z101 |
Eric, what advantage does your proposal have over Z-101?
Why eliminate the normal diode feed path to the aux bus?
You can rewire the brownout booster whether the diode is there or not.
It is a bad idea to have two fuses in series. Z-101 does not fuse the aux bus.
Is a brown out booster really necessary? Doesn't your EFIS have an internal backup
battery?
My radio recovers in a few seconds after engine cranking.
My transponder takes longer to establish its GPS location. But so what?
Why even supply a whole bus with brownout protection?
Why is a separate aux bus needed?
Just connect one or two loads to a brownout booster using dual diodes.
Consider the attached electrical drawing. Just the relay can be energized for
ground operations.
In the unlikely event that the main contactor fails in flight, the relay can be
energized.
With a single bus, there is no need to remember what loads are on what bus.
If it is desired to conserve the battery, just shut off unneeded loads.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500436#500436
Attachments:
http://forums.matronics.com//files/contactor_parallel_relay_207.jpg
Message 11
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| Subject: | Re: Coax Mixing RG-400 and RG58 |
I don't know precise years, but RG-400 came along sometime after I put a
transponder in my first airplane, in the mid-80s. Back then RG-58 was
used for every antenna, except some pricier airplanes used a couple
other 75 ohm cables with more insulation between core and shield.
(RG174? I think). RG-400 is better for DME, transponders and GPS that
operate above 900 Mhz, but RG-58 worked okay.
On 1/27/2021 3:39 PM, Charlie England wrote:
> Same impedance, so I know that *I'd* certainly try it (using the proper
> connectors), before ordering a 2' jumper or re-running the whole thing.
> Worstcase scenario would be ATC telling you it isn't working.
>
> Charlie
>
> On Wed, Jan 27, 2021 at 4:42 PM Jared Yates <email@jaredyates.com
> <mailto:email@jaredyates.com>> wrote:
>
> __
> My hangar neighbor's airplane already has rg58 for the transponder
> antenna, but it is 15 inches short. I happen to have a piece that
> would fix it, bit it is RG400. Is there any problem running the two
> different types of cable in the same feed? Do we need to try and
> round up a piece of RG58 instead?
>
Message 12
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| Subject: | Re: Coax Mixing RG-400 and RG58 |
When faced with a decision like this, do what is best in the long run, not what
is easiest or least expensive.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500438#500438
Message 13
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| Subject: | Re: Coax Mixing RG-400 and RG58 |
At 04:39 PM 1/27/2021, you wrote:
>Same impedance, so I know that *I'd* certainly
>try it (using the proper connectors), before
>ordering a 2' jumper or re-running the whole
>thing.=C2 Worst=C2 case scenario would be ATC telling you it isn't
working.
Agreed. There are no performance risks for extending
the original run of coax with a more modern material
as long as the connectors are appropriate to the
wire and in good shape.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 14
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| Subject: | Re: Some Thoughts on Z101 |
>
>Thoughts?
Can you elaborate on your design goals?
The original goal was to craft a tinker-toy/leggo
style architecture offering a variety of mix/match
features. Each feature enjoyed two feed paths.
The presence of no feature was dependent on
configuration of other features (except for the
brownout booster which goes away if its target
bus is not installed).
All busses are hot any time the main bus is
hot irrespective of other switch positions.
Busses wrapped around the main bus may
be selectively powered up independent
of the main bus.
A full-up system is managed with only 3
toggle switches.
Re brownout booster: I'm pondering a plan-d . . .
or are we up to 'e'? There are dozens of suitable
step up devices on the market but I have no knowledge
of their 'spool up' times nor can I personally
vouch for their specifications without putting
the device under test on the bench and doing
some measurements.
I think I have a way to craft a brown-out booster
of KNOWN performance thus avoiding the risks
for incorporating the Chinese unknowns. Watch
this space.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 15
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| Subject: | Re: Some Thoughts on Z101 |
>
>
>Attachments:
>
>http://forums.matronics.com//files/simplified_boost_topology_619.jpg
A full schematic of the proposed boost
system would make it easier to 'grok'.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 16
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| Subject: | Re: Some Thoughts on Z101 |
Bob I think a clearance delivery bus with brownout protection is an
important design goal for any IFR OBAM aircraft. The ability to get the
clearance, program it, and then start the engine rather than doing it all
with the engine running is almost a necessity in my mind.
I may have enough equipment here that you could unload the testing portion
onto me. If this interests you please get in touch and I will order the
parts and assemble and test a system to your specs.
On Wed, Jan 27, 2021 at 7:02 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
>
>
> Attachments:
>
> http://forums.matronics.com//files/simplified_boost_topology_619.jpg
>
>
> A full schematic of the proposed boost
> system would make it easier to 'grok'.
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
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