Today's Message Index:
----------------------
1. 12:46 AM - Re: Who sells 26 gage wire (Robert L. Nuckolls, III)
2. 05:19 AM - Re: Who sells 26 gage wire (Geoff Heap)
3. 05:28 AM - Who sells 26 gage wire (glen matejcek)
4. 05:45 AM - Tray Connectors...A Bad Idea. (Eric M. Jones)
5. 07:24 AM - Re: Aeroflash power supply (Ken)
6. 08:01 AM - Re: Who sells 26 gage wire (Robert L. Nuckolls, III)
7. 08:04 AM - Re: Tray Connectors...A Bad Idea. (Bill Boyd)
8. 09:06 AM - Re: Aeroflash power supply (David LLoyd)
9. 03:39 PM - Jasco Alternator and Panel Ground Questions (stearman456)
10. 04:13 PM - Re: Jasco Alternator and Panel Ground Questions (Jared Yates)
11. 04:55 PM - Re: Jasco Alternator and Panel Ground Questions (BobsV35B@aol.com)
12. 05:12 PM - Re: Jasco Alternator and Panel Ground Questions (Neal George)
13. 07:15 PM - Re: Vertex VXA700 information needed (rparigoris)
14. 08:40 PM - Re: Jasco Alternator and Panel Ground Questions (stearman456)
Message 1
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| Subject: | Re: Who sells 26 gage wire |
At 07:48 PM 8/17/2010, you wrote:
>The "they" he refers to is Dynon. Their harness is 22 AWG.
Okay, use 3A in-line fuses or replace the
22AWG with 20AWG. The fuses are probably
'cleaner'.
Bob . . .
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| Subject: | Re: Who sells 26 gage wire |
Correct. "They" are Dynon. Thank you for the advice. I think I prefer Bob's first
suggestion. 20awg leads and 24awg for the link....Geoff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309256#309256
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| Subject: | Who sells 26 gage wire |
I also have some to share, but for those still wanting to purchase, try B&B
Aircraft Supply out in Gardner, KS. 913-884-5930. Dan is a great and
helpful guy, and what I have found is that whatever materials he has will
be about the best price you will find. 100 foot rolls of tefzel tend to
run $10...
>Time: 01:08:31 PM PST US
>Subject: AeroElectric-List:
>From: "Geoff Heap" <stol10@comcast.net>
>
>
>I've tried Assco, Wicks, B&C specialty and Radio shack. I can't believe I
can't
>find some. I need maybe just one foot. It's for my Dynon ammeter shunt.
They
>suggest using 26 gage to make fusible links for the two connections. It
seems
>by far the simplest way to do it if I can find some............Geoff
>
>
Glen Matejcek
aerobubba@earthlink.net
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| Subject: | Tray Connectors...A Bad Idea. |
I am sure the notion of sliding a piece of electronics into a tray with the connector
on the back has some informative design history, but it is a horrible idea
for aircraft (and even cars). In general you should avoid it and replace the
connector with a hanging one where the connections aren't attached to two separately
moving bodies.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309261#309261
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| Subject: | Re: Aeroflash power supply |
I suspect this failure is atypical but here is what I learned in case it
helps anyone. This is for a aeroflash 152-0011 power supply with a year
2000 build date. Beside where the 3 strobe wires are soldered to the
circuit board is a T106C1 SCR which switches the trigger signal. My
power supply was not outputting any trigger voltage and I had no voltage
on the anode (center pin) of the SCR. About 3/4" away there were two
330k resistors side by side that divide the 400 volt nominal flash
capacitor voltage in half and then feed the scr and the 330nf trigger
capacitor (blue rectangular cap). The larger 330k resistor (one is half
watt and the other is quarter watt) was found to be open circuited. New
resistor, replace the parts that I removed in the process and all is
well again. There is a trick circuit there as the resistance measured
about as expected when the resistor was in circuit.
As mentioned in another post the trigger transformer was found to be
molded into the 073-0270 flashtube assembly and the power supply only
sends a nominal 175 volt trigger voltage to the flashtube. The tube
flashes when the SCR discharges the 330nf capacitor dropping the
outputted trigger voltage to zero.
Usual Caveats - the large capacitor can carry a 450+ volt fatal charge
even after power is removed from the circuit. Mine bled down to safe
levels in about 10 seconds but yours might not.
Ken
Robert L. Nuckolls, III wrote:
> At 08:35 AM 8/16/2010, you wrote:
>>
>> I have a failed Aeroflash 152-0011 double flash strobe power supply.
>> Aeroflash tells me they will not overhaul it as it is older than 5 years.
>>
>> It charges the 50uf 450 volt capacitor. I can hear the trigger fire at
>> about 450 volts, the voltage keeps building and after about 3 audible
>> triggers it shuts down, likely due to overvoltage at about 500 volts.
>> After several seconds the voltage decays and this repeats. There are
>> no trigger pulses to the flash tube at any time. Even with this
>> description, the Aeroflash support tech thinks it is the proprietary
>> photoflash capacitor but I thought I'd ask the list for any thoughts.
>> It seems that the cap charges OK so I was surprised that the
>> technician still thinks it is the capacitor. It seems they have very
>> few failures of any other components. I have not found a circuit
>> diagram and the semiconductors are not marked.
>
> Here's an exemplar flash tube schematic:
>
>
> Emacs!
>
> There are two capacitors involved with getting
> a strobe to flash. One is the fat energy storage
> capacitor . . . the one that gets charged to
> 400+ volts. (C3 in the schematic)
>
> There's another small capacitor (C6 in this schematic)
> that also charges to 440+ volts. This is the
> trigger generator that gets discharged into
> the secondary of a trigger transformer with
> about a 1:30 step-up ratio. The resulting
> 10,000+ volt pulse is simply applied to a wire
> that wraps around the glass envelope of the
> flash-tube. ELECTROSTATIC coupling of the
> trigger pulse through the glass excites the
> xenon gas into conduction whereby and energy
> from the fat capacitor is discharged through
> the gas.
>
> See:
>
> http://www.repairfaq.org/REPAIR/F_strbfaq.html
>
> What you're describing suggests that the
> power supply is working and the energy storage
> capacitor is charging. What you're probably
> missing is the trigger stimulus.
>
> Bob . . .
Message 6
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| Subject: | Re: Who sells 26 gage wire |
At 07:24 AM 8/18/2010, you wrote:
><aerobubba@earthlink.net>
>
>I also have some to share, but for those still wanting to purchase, try B&B
>Aircraft Supply out in Gardner, KS. 913-884-5930. Dan is a great and
>helpful guy, and what I have found is that whatever materials he has will
>be about the best price you will find. 100 foot rolls of tefzel tend to
>run $10...
But 26AWG???? The smallest airframe wire in
general usage for about 70 years has been
22AWG. While 'oversized' for may electrical
situations, this was the smallest gage for
practical application in aircraft wire bundles
intended to be manipulated in the field by
humans with hand tools.
At Raytheon, we jumped into relatively uncharted
waters with Premier I in an effort to reduce
weight and called out a lot of 24AWG wire.
From a bundle assembly perspective, it was
no big deal. But on the assembly line and in
the field, we caught a lot of flak from
the folks who had to work with the stuff.
The complaints have died down . . . as they
will with time and experience but I'd venture
to assert that 24AWG is about the practical
limit for bundles assembled and maintained
with tools and techniques common to the
industry.
I added the fusible link kits to the AEC
catalog a few years back because 24AWG
wire was rarely found in the wilds of
an avionics or airframe repair shop. This
is probably still a relatively rare wire
size. I don't think M22759 even goes down
to 26AWG and the common catalogs like
http://aeroelectric.com/Mfgr_Data/Wire/Standard_Wire_and_Cable/Std_Wire_Cable.pdf
Don't offer it either.
So if it exists in somebody's wire harness,
it's an extra-ordinary material. If it
exists on somebody's drawings, it may be
a figment of their fondest wishes.
Bob . . .
> >Time: 01:08:31 PM PST US
> >Subject: AeroElectric-List:
> >From: "Geoff Heap" <stol10@comcast.net>
> >
> >
> >I've tried Assco, Wicks, B&C specialty and Radio shack. I can't believe I
>can't
> >find some. I need maybe just one foot. It's for my Dynon ammeter shunt.
>They
> >suggest using 26 gage to make fusible links for the two connections. It
>seems
> >by far the simplest way to do it if I can find some............Geoff
> >
> >
>Glen Matejcek
>aerobubba@earthlink.net
>
>
>Checked by AVG - www.avg.com
>08/17/10 13:35:00
Bob . . .
Message 7
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| Subject: | Re: Tray Connectors...A Bad Idea. |
Given my experience with an elusive transponder intermittent caused by a
mechanically unsound tray-mounted coax bulkhead connector, I tend to agree
with your assessment. Just not clear on how you achieve this without doing
surgery on the avionics sure to void the warranty. Do you have a how-to on
remoting the connectors on the back of avionis boxes into pigtails, Eric?
I'd like to see how you implement this idea.
-Bill B
On Wed, Aug 18, 2010 at 8:44 AM, Eric M. Jones <emjones@charter.net> wrote:
> emjones@charter.net>
>
> I am sure the notion of sliding a piece of electronics into a tray with the
> connector on the back has some informative design history, but it is a
> horrible idea for aircraft (and even cars). In general you should avoid it
> and replace the connector with a hanging one where the connections aren't
> attached to two separately moving bodies.
>
> --------
> Eric M. Jones
> www.PerihelionDesign.com
> 113 Brentwood Drive
> Southbridge, MA 01550
> (508) 764-2072
> emjones@charter.net
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=309261#309261
>
>
Message 8
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| Subject: | Re: Aeroflash power supply |
Ken,
...great detail and I for one appreciate your findings and insight.
this will be added to my library as I have buds with similar strobe set-ups.
David
______________________________________
----- Original Message -----
From: "Ken" <klehman@albedo.net>
Sent: Wednesday, August 18, 2010 7:14 AM
Subject: Re: AeroElectric-List: Aeroflash power supply
>
> I suspect this failure is atypical but here is what I learned in case it
> helps anyone. This is for a aeroflash 152-0011 power supply with a year
> 2000 build date. Beside where the 3 strobe wires are soldered to the
> circuit board is a T106C1 SCR which switches the trigger signal. My power
> supply was not outputting any trigger voltage and I had no voltage on the
> anode (center pin) of the SCR. About 3/4" away there were two 330k
> resistors side by side that divide the 400 volt nominal flash capacitor
> voltage in half and then feed the scr and the 330nf trigger capacitor
> (blue rectangular cap). The larger 330k resistor (one is half watt and the
> other is quarter watt) was found to be open circuited. New resistor,
> replace the parts that I removed in the process and all is well again.
> There is a trick circuit there as the resistance measured about as
> expected when the resistor was in circuit.
>
> As mentioned in another post the trigger transformer was found to be
> molded into the 073-0270 flashtube assembly and the power supply only
> sends a nominal 175 volt trigger voltage to the flashtube. The tube
> flashes when the SCR discharges the 330nf capacitor dropping the outputted
> trigger voltage to zero.
>
> Usual Caveats - the large capacitor can carry a 450+ volt fatal charge
> even after power is removed from the circuit. Mine bled down to safe
> levels in about 10 seconds but yours might not.
>
> Ken
>
> Robert L. Nuckolls, III wrote:
>> At 08:35 AM 8/16/2010, you wrote:
>>>
>>> I have a failed Aeroflash 152-0011 double flash strobe power supply.
>>> Aeroflash tells me they will not overhaul it as it is older than 5
>>> years.
>>>
>>> It charges the 50uf 450 volt capacitor. I can hear the trigger fire at
>>> about 450 volts, the voltage keeps building and after about 3 audible
>>> triggers it shuts down, likely due to overvoltage at about 500 volts.
>>> After several seconds the voltage decays and this repeats. There are no
>>> trigger pulses to the flash tube at any time. Even with this
>>> description, the Aeroflash support tech thinks it is the proprietary
>>> photoflash capacitor but I thought I'd ask the list for any thoughts. It
>>> seems that the cap charges OK so I was surprised that the technician
>>> still thinks it is the capacitor. It seems they have very few failures
>>> of any other components. I have not found a circuit diagram and the
>>> semiconductors are not marked.
>>
>> Here's an exemplar flash tube schematic:
>>
>>
>> Emacs!
>>
>> There are two capacitors involved with getting
>> a strobe to flash. One is the fat energy storage
>> capacitor . . . the one that gets charged to
>> 400+ volts. (C3 in the schematic)
>>
>> There's another small capacitor (C6 in this schematic)
>> that also charges to 440+ volts. This is the
>> trigger generator that gets discharged into
>> the secondary of a trigger transformer with
>> about a 1:30 step-up ratio. The resulting
>> 10,000+ volt pulse is simply applied to a wire
>> that wraps around the glass envelope of the
>> flash-tube. ELECTROSTATIC coupling of the
>> trigger pulse through the glass excites the
>> xenon gas into conduction whereby and energy
>> from the fat capacitor is discharged through
>> the gas.
>>
>> See:
>>
>> http://www.repairfaq.org/REPAIR/F_strbfaq.html
>>
>> What you're describing suggests that the
>> power supply is working and the energy storage
>> capacitor is charging. What you're probably
>> missing is the trigger stimulus.
>>
>> Bob . . .
>
>
>
Message 9
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| Subject: | Jasco Alternator and Panel Ground Questions |
I'm brand new around here, still reading Bob's book for the first time, and just
tooling up to wire my Stearman restoration. I have two questions:
1) The wiring diagram available online for it is kinda poor, but can anyone confirm
for me that a 14 v/50 amp Jasco 6555T-1 alternator will work with the B&C
LR3C-14 controller? I think it will but the online alternator schematic is
rather crude.
and
2) If using the B&C firewall bus kit, does the avionics ground bus Bob talks
about (the panel bus) ultimately tie into it?
thanks,
Dan
warbirds@shaw.ca
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309320#309320
Message 10
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| Subject: | Re: Jasco Alternator and Panel Ground Questions |
I believe that the avionics ground bus ties to the B&C with 5 20 gauge
wires. I just happened to be reading that section the other day. I was
wondering though, if I have enough real estate on the larger ground bus, and
all of my avionics are a foot away, should I still use the D-sub bus, or
should I just use the other tabs instead?
On Wed, Aug 18, 2010 at 6:37 PM, stearman456 <warbirds@shaw.ca> wrote:
>
> I'm brand new around here, still reading Bob's book for the first time, and
> just tooling up to wire my Stearman restoration. I have two questions:
>
> 1) The wiring diagram available online for it is kinda poor, but can
> anyone confirm for me that a 14 v/50 amp Jasco 6555T-1 alternator will work
> with the B&C LR3C-14 controller? I think it will but the online alternator
> schematic is rather crude.
>
> and
>
> 2) If using the B&C firewall bus kit, does the avionics ground bus Bob
> talks about (the panel bus) ultimately tie into it?
>
> thanks,
> Dan
> warbirds@shaw.ca
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=309320#309320
>
>
Message 11
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| Subject: | Re: Jasco Alternator and Panel Ground Questions |
Good Afternoon Dan,
I do not know whether the B&C alternator controller will work or not.
However, the Jasco folks will send you a wiring diagram for your Stearman that
is right up to date. The original Jasco installation on my Stearman was done
when no radio was anticipated. They now have a newer wiring diagram to be
used when a radio is to be installed. I have found the Jasco folks to be
very nice to work with.
Will we see you at Galesburg?
PS The B&C folks are also first class. I would not hesitate to call and
ask them if you do not already have the Jasco Alternator Controller.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Downers Grove, Illinois
Stearman N3977A
Buzz number 325
In a message dated 8/18/2010 5:40:49 P.M. Central Daylight Time,
warbirds@shaw.ca writes:
--> AeroElectric-List message posted by: "stearman456" <warbirds@shaw.ca>
I'm brand new around here, still reading Bob's book for the first time,
and just tooling up to wire my Stearman restoration. I have two questions:
1) The wiring diagram available online for it is kinda poor, but can
anyone confirm for me that a 14 v/50 amp Jasco 6555T-1 alternator will work
with the B&C LR3C-14 controller? I think it will but the online alternator
schematic is rather crude.
and
2) If using the B&C firewall bus kit, does the avionics ground bus Bob
talks about (the panel bus) ultimately tie into it?
thanks,
Dan
warbirds@shaw.ca
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309320#309320
Message 12
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| Subject: | Jasco Alternator and Panel Ground Questions |
Dan -
Welcome!
I would expect most any wound-field alternator to play well with the LR3C.
A call to the manufacturer is in order.
If you choose to mount an avionics ground buss, it should tie directly to
the firewall-mounted ground buss.
Neal
-----Original Message-----
I'm brand new around here, still reading Bob's book for the first time, and
just tooling up to wire my Stearman restoration. I have two questions:
1) The wiring diagram available online for it is kinda poor, but can anyone
confirm for me that a 14 v/50 amp Jasco 6555T-1 alternator will work with
the B&C LR3C-14 controller? I think it will but the online alternator
schematic is rather crude.
and
2) If using the B&C firewall bus kit, does the avionics ground bus Bob
talks about (the panel bus) ultimately tie into it?
thanks,
Dan
warbirds@shaw.ca
Message 13
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| Subject: | Re: Vertex VXA700 information needed |
Figured I share information I have about hooking up a handheld Vertex VXA700 to
an audio panel since help form other sources seems to be in short order:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=81045
This is cable that allows you to use an external PTT switch. You can select a higher
resolution on top right of page.
Here is completed cable and schematic:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=81445
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309347#309347
Message 14
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| Subject: | Re: Jasco Alternator and Panel Ground Questions |
Thanks for the help, guys. Rereading Bob's book I see now where the Avionics ground
bus does tie to the main ground either with the three 20 gauge or two 14
gauge wires.
Won't see you at Galesburg this year Bob, but maybe in '12.
I'd sure like to use the LR3C-14 after reading about it (besides I already bought
one!) as it looks like an overall simpler installation and comes complete with
the OV protection and low voltage warning.
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309353#309353
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