Today's Message Index:
----------------------
1. 06:49 AM - Molex vs bus bar (Daryl Thompson)
2. 08:22 AM - Re: Molex vs bus bar (Charlie England)
3. 08:58 AM - Re: Molex vs bus bar (Daryl Thompson)
4. 10:00 AM - Re: Molex vs bus bar (Charlie England)
5. 10:19 AM - Re: Molex vs bus bar (Daryl Thompson)
6. 11:29 AM - Re: EFIS Erratic Temp Readings ()
7. 04:21 PM - Re: Molex vs bus bar (user9253)
8. 05:04 PM - Antenna Grounding (Eric Page)
9. 07:53 PM - Re: Antenna Grounding (user9253)
10. 07:57 PM - Re: Antenna Grounding (user9253)
Message 1
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| Subject: | Molex vs bus bar |
Need some thoughts from you guys. I am installing 8 Mitchell products
cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc). I am
wondering if there are any disadvantages to using a molex 8 pin connector
with one side having the 8 power wires connected to it and the other side
with the single 20 AWG power wire to one pin location and then use jumping
wires to connect in series the other remaining pins so as to power the
entire set of 8 gauge clusters. Each cluster draws 1/10th amp and 20 AWG
wire is attached to the existing 5A Inst Gauge C/B. The other alternative
would be to use a bus bar but I am very limited in locating a good place to
attach a bar. Could I also do the same for the grounding wires, i.e. 8
ground wires to one side of the molex connector and other side with a
single grounding wire with jumped pins. The single ground wire (size?)
would be grounded to the frame. The entire installation will be receiving a
337 field approval. Thoughts?
Message 2
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| Subject: | Re: Molex vs bus bar |
On 2/8/2021 8:48 AM, Daryl Thompson wrote:
> Need some thoughts from you guys. I am installing 8 Mitchell products
> cluster gauges in a 1978PA32-300 (fuel qty, oil press, oil tem, etc).
> I am wondering if there are any disadvantages to using a molex 8 pin
> connector with one side having the 8 power wires connected to it and
> the other side with the single 20 AWG power wire to one pin location
> and then use jumping wires to connect in series the other
> remainingpins so as to power the entire set of 8 gauge clusters. Each
> cluster draws 1/10th amp and 20 AWG wire is attached to the existing
> 5A Inst Gauge C/B. The other alternative would be to use a bus bar
> but I am very limited in locating a good place to attach a bar. Could
> I also do the same for the grounding wires, i.e. 8 ground wires to one
> side of the molex connector and other side with a single grounding
> wire with jumped pins. The single ground wire (size?) would be
> grounded to the frame. The entire installation will be receiving a 337
> field approval. Thoughts?
The architecture sounds reasonable to me, but my personal choice of
hardware would not be molex. I was an electronics tech in several past
lives, and saw a *lot* of reliability issues with them, in a lot of
different environments. In addition, jumping that many pins would be as
big a pain as just jumping from instrument to instrument in the
'traditional' fashion of wiring instruments.
My choice of hardware would be Dsub. The airframe side of the connector
could be a molded solder cup style, allowing you to bridge an entire
line of pins with a single bared wire for B+, and the same on the other
line for ground. A 25 pin connector would likely take less real estate
than a 16 pin molex. The instrument side of the connector could be the
removable pin type of connector, making it easy to add additional power
wires for each instrument. Similar idea to the 'panel ground bus'
detailed in the AEC drawings, but with one row being the supply instead
of ground.
FWIW,
Charlie
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Message 3
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| Subject: | Re: Molex vs bus bar |
Awesome idea! Thank you sir! Any recommendations on the best place to buy
the d subs?
On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7@gmail.com>
wrote:
> ceengland7@gmail.com>
>
> On 2/8/2021 8:48 AM, Daryl Thompson wrote:
> > Need some thoughts from you guys. I am installing 8 Mitchell products
> > cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
> > I am wondering if there are any disadvantages to using a molex 8 pin
> > connector with one side having the 8 power wires connected to it and
> > the other side with the single 20 AWG power wire to one pin location
> > and then use jumping wires to connect in series the other
> > remaining pins so as to power the entire set of 8 gauge clusters. Each
> > cluster draws 1/10th amp and 20 AWG wire is attached to the existing
> > 5A Inst Gauge C/B. The other alternative would be to use a bus bar
> > but I am very limited in locating a good place to attach a bar. Could
> > I also do the same for the grounding wires, i.e. 8 ground wires to one
> > side of the molex connector and other side with a single grounding
> > wire with jumped pins. The single ground wire (size?) would be
> > grounded to the frame. The entire installation will be receiving a 337
> > field approval. Thoughts?
> The architecture sounds reasonable to me, but my personal choice of
> hardware would not be molex. I was an electronics tech in several past
> lives, and saw a *lot* of reliability issues with them, in a lot of
> different environments. In addition, jumping that many pins would be as
> big a pain as just jumping from instrument to instrument in the
> 'traditional' fashion of wiring instruments.
>
> My choice of hardware would be Dsub. The airframe side of the connector
> could be a molded solder cup style, allowing you to bridge an entire
> line of pins with a single bared wire for B+, and the same on the other
> line for ground. A 25 pin connector would likely take less real estate
> than a 16 pin molex. The instrument side of the connector could be the
> removable pin type of connector, making it easy to add additional power
> wires for each instrument. Similar idea to the 'panel ground bus'
> detailed in the AEC drawings, but with one row being the supply instead
> of ground.
>
> FWIW,
>
> Charlie
>
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Message 4
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| Subject: | Re: Molex vs bus bar |
They're sold by just about every vendor that handles electronic components,
so it's hard to recommend just one. For the individual crimp pin type, B&C
would be a great choice.
https://bandc.com/product-category/electrical-supplies/d-sub-audio-connectors/
For solder style (and crimp, as well), just about any of the 'usual
suspects'. Newark, Mouser, Digi-Key, Allied, etc. The highest quality
individual pins are like the ones B&C sells; known as 'machined pins', that
have gold plated contact surfaces. Some (not all) of the solder type
connectors will have gold plated contact surfaces, as well. Just search
their sites for 'Dsub' and 'DB25' (for a 25 pin version).
Charlie
On Mon, Feb 8, 2021 at 11:06 AM Daryl Thompson <flyer532@gmail.com> wrote:
> Awesome idea! Thank you sir! Any recommendations on the best place to buy
> the d subs?
>
> On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7@gmail.com>
> wrote:
>
>> ceengland7@gmail.com>
>>
>> On 2/8/2021 8:48 AM, Daryl Thompson wrote:
>> > Need some thoughts from you guys. I am installing 8 Mitchell products
>> > cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
>> > I am wondering if there are any disadvantages to using a molex 8 pin
>> > connector with one side having the 8 power wires connected to it and
>> > the other side with the single 20 AWG power wire to one pin location
>> > and then use jumping wires to connect in series the other
>> > remaining pins so as to power the entire set of 8 gauge clusters. Each
>> > cluster draws 1/10th amp and 20 AWG wire is attached to the existing
>> > 5A Inst Gauge C/B. The other alternative would be to use a bus bar
>> > but I am very limited in locating a good place to attach a bar. Could
>> > I also do the same for the grounding wires, i.e. 8 ground wires to one
>> > side of the molex connector and other side with a single grounding
>> > wire with jumped pins. The single ground wire (size?) would be
>> > grounded to the frame. The entire installation will be receiving a 337
>> > field approval. Thoughts?
>> The architecture sounds reasonable to me, but my personal choice of
>> hardware would not be molex. I was an electronics tech in several past
>> lives, and saw a *lot* of reliability issues with them, in a lot of
>> different environments. In addition, jumping that many pins would be as
>> big a pain as just jumping from instrument to instrument in the
>> 'traditional' fashion of wiring instruments.
>>
>> My choice of hardware would be Dsub. The airframe side of the connector
>> could be a molded solder cup style, allowing you to bridge an entire
>> line of pins with a single bared wire for B+, and the same on the other
>> line for ground. A 25 pin connector would likely take less real estate
>> than a 16 pin molex. The instrument side of the connector could be the
>> removable pin type of connector, making it easy to add additional power
>> wires for each instrument. Similar idea to the 'panel ground bus'
>> detailed in the AEC drawings, but with one row being the supply instead
>> of ground.
>>
>> FWIW,
>>
>> Charlie
>>
>> --
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>>
Message 5
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| Subject: | Re: Molex vs bus bar |
Ok thanks Charlie
On Mon, Feb 8, 2021 at 1:11 PM Charlie England <ceengland7@gmail.com> wrote:
> They're sold by just about every vendor that handles electronic
> components, so it's hard to recommend just one. For the individual crimp
> pin type, B&C would be a great choice.
>
> https://bandc.com/product-category/electrical-supplies/d-sub-audio-connectors/
>
> For solder style (and crimp, as well), just about any of the 'usual
> suspects'. Newark, Mouser, Digi-Key, Allied, etc. The highest quality
> individual pins are like the ones B&C sells; known as 'machined pins', that
> have gold plated contact surfaces. Some (not all) of the solder type
> connectors will have gold plated contact surfaces, as well. Just search
> their sites for 'Dsub' and 'DB25' (for a 25 pin version).
>
> Charlie
>
>
> On Mon, Feb 8, 2021 at 11:06 AM Daryl Thompson <flyer532@gmail.com> wrote:
>
>> Awesome idea! Thank you sir! Any recommendations on the best place to
>> buy the d subs?
>>
>> On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7@gmail.com>
>> wrote:
>>
>>> ceengland7@gmail.com>
>>>
>>> On 2/8/2021 8:48 AM, Daryl Thompson wrote:
>>> > Need some thoughts from you guys. I am installing 8 Mitchell products
>>> > cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
>>> > I am wondering if there are any disadvantages to using a molex 8 pin
>>> > connector with one side having the 8 power wires connected to it and
>>> > the other side with the single 20 AWG power wire to one pin location
>>> > and then use jumping wires to connect in series the other
>>> > remaining pins so as to power the entire set of 8 gauge clusters. Each
>>> > cluster draws 1/10th amp and 20 AWG wire is attached to the existing
>>> > 5A Inst Gauge C/B. The other alternative would be to use a bus bar
>>> > but I am very limited in locating a good place to attach a bar. Could
>>> > I also do the same for the grounding wires, i.e. 8 ground wires to one
>>> > side of the molex connector and other side with a single grounding
>>> > wire with jumped pins. The single ground wire (size?) would be
>>> > grounded to the frame. The entire installation will be receiving a 337
>>> > field approval. Thoughts?
>>> The architecture sounds reasonable to me, but my personal choice of
>>> hardware would not be molex. I was an electronics tech in several past
>>> lives, and saw a *lot* of reliability issues with them, in a lot of
>>> different environments. In addition, jumping that many pins would be as
>>> big a pain as just jumping from instrument to instrument in the
>>> 'traditional' fashion of wiring instruments.
>>>
>>> My choice of hardware would be Dsub. The airframe side of the connector
>>> could be a molded solder cup style, allowing you to bridge an entire
>>> line of pins with a single bared wire for B+, and the same on the other
>>> line for ground. A 25 pin connector would likely take less real estate
>>> than a 16 pin molex. The instrument side of the connector could be the
>>> removable pin type of connector, making it easy to add additional power
>>> wires for each instrument. Similar idea to the 'panel ground bus'
>>> detailed in the AEC drawings, but with one row being the supply instead
>>> of ground.
>>>
>>> FWIW,
>>>
>>> Charlie
>>>
>>> --
>>> This email has been checked for viruses by Avast antivirus software.
>>> https://www.avast.com/antivirus
>>>
>>> ==========
>>> -
>>> Electric-List" rel="noreferrer" target="_blank">
>>> http://www.matronics.com/Navigator?AeroElectric-List
>>> ==========
>>> FORUMS -
>>> eferrer" target="_blank">http://forums.matronics.com
>>> ==========
>>> WIKI -
>>> errer" target="_blank">http://wiki.matronics.com
>>> ==========
>>> b Site -
>>> -Matt Dralle, List Admin.
>>> rel="noreferrer" target="_blank">http://www.matronics.com/contribution
>>> ==========
>>>
>>>
>>>
>>>
Message 6
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| Subject: | EFIS Erratic Temp Readings |
Hi Mike,
Can you remind us whether the engine is 'standard' mags & carb (or Bendix
style injection), or if it has some combination of electronic ignition/fuel
injection?
It is a LOM engine with magneto's only and mechanical fuel injection. No
electronics on the engine at all
Mike
Thanks,
Charlie
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| Subject: | Re: Molex vs bus bar |
Steinair also sells D-Sub pins.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500607#500607
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| Subject: | Antenna Grounding |
I think I know the answer to this question, but I'd like confirmation: does an
antenna ground plane have to be electrically bonded to the airframe?
The aircraft is a Kitfox, which has a steel tube fuselage. In an effort to keep
the outside of the plane as clean as possible, I'm trying to put as many antennas
as I can inside the fabric envelope. For example, the comm antenna...
https://www.aircraftspruce.com/catalog/avpages/antennasystems.php
...is mounted inside the vertical stab. Other Kitfox builders have reported good
performance with this antenna in the tail, despite a couple of steel tubes
in the vicinity.
Since the transponder and ADS-B antennas...
https://www.aircraftspruce.com/catalog/avpages/ted_transponder.php
--and--
https://www.aircraftspruce.com/catalog/avpages/monopole11-13561.php
...are so short, they'll easily fit inside the wings. I can fabricate a ~3" diameter
ground plane from aluminum sheet for each of them, but there's no way to
electrically ground those plates to the airframe if they're suspended inside
the wings. Is that a problem, or is a good bond from coax shield to ground plane
all that's needed? Thanks.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500608#500608
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| Subject: | Re: Antenna Grounding |
No, the ground plane does not have to be grounded to the airframe.
Com antennas should be vertically polarized. The ANTENNA VHF-5 will work in a
wing,
but not very well. It might work well vertically in the tail.
How about this antenna for $45?
https://www.aircraftspruce.com/catalog/avpages/stainlessantenna.php
You could make your own antenna.
http://www.aeroelectric.com/articles/Antennas/DIY_Comm_Ant/DIY_Comm.html
But for $45, it will be easier to buy one.
Mount it vertically inside of the fuselage. It can either point up or down.
Make a ground plane out of 4 wires going out in 4 directions.
Keep the first half of the antenna away from airframe tubes.
Use a SWR meter to check how well the antenna works.
What engine are you using in your Kitfox?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500610#500610
Message 10
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| Subject: | Re: Antenna Grounding |
Did you mean 3 inch radius for the transponder antenna? 3 inch diameter is too
small.
The radius should be at least as long as the antenna.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500611#500611
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