Today's Message Index:
----------------------
1. 08:31 AM - Re: coax splitter (Eric Page)
2. 04:34 PM - Tie wrapping connectors closed (Sebastien)
3. 05:15 PM - magneto problems (barrie)
4. 05:49 PM - Re: Tie wrapping connectors closed (Robert McCallum)
5. 06:43 PM - Mag switch (John Keen)
6. 07:06 PM - Re: magneto problems (Kelly McMullen)
7. 07:16 PM - Re: magneto problems (barrie)
8. 07:51 PM - Grounding On A Composite Airplane (William Hunter)
Message 1
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| Subject: | Re: coax splitter |
I did a little more poking around online and found this device:
http://shakespeare-ce.com/marine/product/as-2-switch/
It covers DC-600MHz and handles 30W. It sells for between $70 and $130 online.
I found it on eBay, Walmart and a number of marine retailers.
One big caveat, however: it requires 12VDC to operate, so in the event of total
electrical failure, it won't switch. If the panel radio was the last to transmit,
your handheld/backup radio would not see the antenna. That said, how likely
is total electrical failure?
If you want an active, automatic switching device, perhaps one that defaults to
a handheld-to-antenna connection when not powered would be the best solution.
Haven't found one of those yet...
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469438#469438
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| Subject: | Tie wrapping connectors closed |
I saw these in an aircraft the other day and thought the list might be
interested in them. They appear to be designed to be secured with a small
tie wrap. The owner was apparently using them as part of an electronic
ignition harness after problems with previous connectors.
Sebastien
Message 3
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| Subject: | magneto problems |
Hi, I have just finished an engine install in my homebuilt and have a problem with
the Mags(probably of my own doing). After starting and checking for mag a
drop, the left mag somehow appears to be grounded. The engine starts ok and the
left mag has the impulse so I am assuming that it was working alright to begin
with. Also the right one is working just fine. [Question] I am sure that I
have overlooked something but just haven't been able to figure it out. Does anybody
have the magic solution?
Thanks
Barrie
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469448#469448
Message 4
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| Subject: | Re: Tie wrapping connectors closed |
Sebastien;
Those are "standard" thermocouple plugs and sockets which are assembled using
hollow tubular rivets. The installer in this case has taken advantage of those
hollow rivets to secure the male/female connector halves to each other with tie
wraps. This particular style of connector uses relatively low pressure contacts
and are fairly easily disconnected as they do not afford must resistance to
separation so the tie wraps are probably good insurance. Kink below is one
source for these.
https://tinyurl.com/m98tjqe
For use in an "ignition system" higher pressure, more positive, connectors such
as PIDG style would be advisable.
Bob McC
> ---------- Original Message ----------
> From: Sebastien <cluros@gmail.com>
> Date: May 19, 2017 at 7:32 PM
>
> I saw these in an aircraft the other day and thought the list might be
> interested in them. They appear to be designed to be secured with a small tie
> wrap. The owner was apparently using them as part of an electronic ignition
> harness after problems with previous connectors.
>
> Sebastien
>
Message 5
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Hi,
The toggle switches shown in =9CMags_with_Electronic_Tach.pdf=9D
- am I correct in thinking these should be DPST ON-NONE-ON?
I have a push to start button and an electronic tach, and impulse
coupler to both mags so the lower diagram is exactly my setup.
Cheers,
John.
John Keen
0412 141 833
15 Scott St
Scone NSW Australia 2337
Message 6
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| Subject: | Re: magneto problems |
Are you certain that you had the engine at TDC on the compression stroke
when you installed the left mag? You can get your symptoms if the mag is
installed on the non-firing stroke.
On 5/19/2017 5:14 PM, barrie wrote:
>
> Hi, I have just finished an engine install in my homebuilt and have a problem
with the Mags(probably of my own doing). After starting and checking for mag
a drop, the left mag somehow appears to be grounded. The engine starts ok and
the left mag has the impulse so I am assuming that it was working alright to begin
with. Also the right one is working just fine. [Question] I am sure that
I have overlooked something but just haven't been able to figure it out. Does
anybody have the magic solution?
> Thanks
> Barrie
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=469448#469448
>
>
>
>
>
>
>
>
>
Message 7
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| Subject: | Re: magneto problems |
Yes, positive. I took a lot of care when doing the installation
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469452#469452
Message 8
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| Subject: | Grounding On A Composite Airplane |
Greetings,
I have a question about the grounding cables of this in construction design.
I have two independent electrical systems each with a heavy gauge cable that
connects the respective NEG pole of the battery to the engine block/starter
motor case and the questions are:
Do I need a ground cable to connect the two NEG sides together or is the big
cables that connect the respective batteries to the engine block/starter
sufficient?
If you do recommend a ground interconnect what size cable should I have
considering that one battery is mounted under the rear seat and the other is
mounted in the nose?
-------------------------ADDITIONAL
INFORMATION------------------------------------
The airplane is a Velocity (composite pusher) with a TIO-540 engine (7.3
compression) and a 12 VDC dual battery/dual independent electrical systems.
The "RED" system is an independent system that is powered by an SD-20 and a
BNC BC116-1 battery mounted under the rear seat The POS cable is AWG 2 and
runs from battery + to the battery contactor mounted under the rear seat.
The other pole of the contactor is mounted to a copper bus bar that is the
BUS TIE. The NEG cable is AWG 2 and runs directly from the battery (-) pole
to a stud on the starter motor. There is a AWG 8 cable that connects the
engine block to a rear firewall bus bar (copper bar). The alternator cable
and the bus feed are 8 AWG wire. The RED system just powers the following:
-Pilot side EFIS
-Plasma III ignition system
-Taxi light.
The "GREEN" system is an independent system that is powered by a L60 and a
BNC BC116-1 battery mounted in the nose. The POS cable is AWG 2 and runs
from battery + to the battery contactor mounted in the nose and then another
AWG 2 cable connects the battery contactor to the BUS TIE mounted on a
copper bus bar mounted under the rear seat. The NEG cable is AWG 2 and runs
from the battery (-) pole directly to the stud on the engine block. There
is a AWG 8 cable that connects the battery (-) pole to the nose/avionics
firewall bus bar (copper bar). The GREEN system powers the following:
-Copilot EFIS
-Plasma III ignition system
-All other electrical loads
The BUS TIE contactor is mounted under the rear seat and one pole is the
GEEEN system power feed cable and the other pole is connected to the copper
bus bar that the connects the RED system battery contactor and the starter
contactor. The starter contactor has a 2 AWG cable that connects the
starter contactor to the starter motor.
..
THANKS!!!
Bill Hunter
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