Today's Message Index:
----------------------
1. 05:32 AM - Re: Manual intercom PTT (Jeff Point)
2. 08:00 AM - Re: Manual intercom PTT (Stein Bruch)
3. 08:38 AM - Re: Manual intercom PTT (Richard Girard)
4. 09:08 AM - Re: Wiper motors question (Bob Verwey)
5. 09:22 AM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (Ken Ryan)
6. 09:44 AM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (don van santen)
7. 10:38 AM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (Ken Ryan)
8. 11:22 AM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (don van santen)
9. 01:24 PM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (Charlie England)
10. 01:54 PM - Re: Re: Alternators - To Fuse or not to fuse - That IS the question (don van santen)
Message 1
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| Subject: | Re: Manual intercom PTT |
That's an interesting idea, and for the price I will pick one up to play
with it. Many of them also have foam earplug-type earphones ala Clarity
Aloft... and are designed to fit under helmets anyway... now if I can
just get the impedances to match up.
Jeff
On 9/8/17 8:07 PM, Robert L. Nuckolls, III wrote:
>
> One of these products might be ideal for the Breezy application.
> Unless your fly with your mouth open to the slipstream,
> they'll pick up no ambient or wind nose whatsoever.
>
> http://tinyurl.com/yclr8szt
>
>
> <http://tinyurl.com/yclr8szt>
>
> Bob . . .
>
Message 2
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| Subject: | Manual intercom PTT |
The 'best' solution is to get a high noise intercom like the PS Engineering PM1200
or similar (that we often use in P-51's or B-25's, and other open cockpit
aircraft) or other slightly better intercom that has a PTT (Push to Talk) that
actually has two PTT switches (one for intercom PTT and the other for transmit
PTT) as well as having a very powerful squelch circuit meant for high noise
enviornments.
The MGL would not be my first choice...
Just my 2 cents as usual!
Cheers,
Stein
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of jpoint@wi.rr.com
Sent: Friday, September 08, 2017 9:19 PM
Subject: Re: AeroElectric-List: Manual intercom PTT
The ANR works fine- this is definitely an open mic caused by wind noise.
What would be the advantage of grounding the mic voltage vs. just opening it up
completely? It's s horse apiece to wire it either way.
Jeff
---- Daniel Hooper <enginerdy@gmail.com> wrote:
> --> <enginerdy@gmail.com>
>
> Are you certain there are no issues with the wind noise interfering with the
ANR and making it more noisy?
>
> That could sound like an open mic, possibly.
>
>
> I invite others to comment on this, but I believe you could just ground the mic
terminal to silence it. There is mic bias voltage on that pin that powers the
microphone capsule, but it should run through enough resistance inside the
radio that this should be no problem.
>
> If that makes you uncomfortable, shorting it through a capacitor should be fine
as well. In that case, youd want a 1M resistor across the shorting switch to
keep the capacitor charged to prevent a big POP when the switch is thrown.
>
> You could get some version of that done with a DPDT like you described.
Message 3
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| Subject: | Re: Manual intercom PTT |
I made a mic cover from a battery terminal cover and some porous foam.
Helped with the wind noise in my trike.
Rick Girard
On Sat, Sep 9, 2017 at 9:59 AM, Stein Bruch <stein@steinair.com> wrote:
m
> >
>
> The 'best' solution is to get a high noise intercom like the PS
> Engineering PM1200 or similar (that we often use in P-51's or B-25's, and
> other open cockpit aircraft) or other slightly better intercom that has a
> PTT (Push to Talk) that actually has two PTT switches (one for intercom P
TT
> and the other for transmit PTT) as well as having a very powerful squelch
> circuit meant for high noise enviornments.
>
> The MGL would not be my first choice...
>
> Just my 2 cents as usual!
>
> Cheers,
> Stein
>
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com [mailto:
> owner-aeroelectric-list-server@matronics.com] On Behalf Of
> jpoint@wi.rr.com
> Sent: Friday, September 08, 2017 9:19 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Manual intercom PTT
>
>
> The ANR works fine- this is definitely an open mic caused by wind noise.
>
> What would be the advantage of grounding the mic voltage vs. just opening
> it up completely? It's s horse apiece to wire it either way.
>
> Jeff
>
> ---- Daniel Hooper <enginerdy@gmail.com> wrote:
> > --> <enginerdy@gmail.com>
> >
> > Are you certain there are no issues with the wind noise interfering wit
h
> the ANR and making it more noisy?
> >
> > That could sound like an open mic, possibly.
> >
> >
> > I invite others to comment on this, but I believe you could just ground
> the mic terminal to silence it. There is mic bias voltage on that pin tha
t
> powers the microphone capsule, but it should run through enough resistanc
e
> inside the radio that this should be no problem.
> >
> > If that makes you uncomfortable, shorting it through a capacitor should
> be fine as well. In that case, you=99d want a 1M resistor across th
e shorting
> switch to keep the capacitor charged to prevent a big POP when the switch
> is thrown.
> >
> > You could get some version of that done with a DPDT like you described.
>
>
===========
===========
===========
===========
===========
>
>
--
=9CBlessed are the cracked, for they shall let in the light.=9D
Groucho Marx
<http://www.goodreads.com/author/show/43244.Groucho_Marx>
Message 4
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| Subject: | Re: Wiper motors question |
My guess (based on having used one as a trim motor) is that most of them
are dumb motors governed by external inputs like limit switches and
timers....BWTHDIK
Best...
Bob Verwey
082 331 2727
On 8 September 2017 at 18:14, weloveflying <yourordinarybeing@gmail.com>
wrote:
> yourordinarybeing@gmail.com>
>
> *Newbie Question/First Thread*
>
> I'm just wondering what kind of motors are used for wipers; are they servo
> motors, like this one: SM110 Motor Series (http://www.powerjackmotion.
> com/product/sm110-motor-series/), or are they just simply wiper motors,
> which are powered by a universal, electric motors?
>
> My hunch tells me that servo motors are the ones that are behind it, which
> is of course based on my understanding of a servo's function; nevertheless,
> it's just my hunch.
>
> Your thoughts are very much welcome!
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=472629#472629
>
>
Message 5
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp Carbon
Pile Load Tester:
https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html
I thought that this is what we would use to annually test the capacity of
our batteries. I thought that we would connect the battery, set the amps to
our expected load (for example, 12 amps) and then time how long until
battery voltage reaches an unacceptably low level.
But, upon reviewing the user manual for this tool, it does not look like
that is what this thing is for. It appears to just load the battery for a
short period of time and then extrapolate the battery condition based on
how it behaves for that very short test period.
What's the deal? How do we use this tool to check on our battery condition,
annually?
Ken
Message 6
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
Ken,
The device tbat would test the battery the way you thought is a West
Mountain CBA. The carbon pile is set at a much higher amp rate and draws
the battery down very fast. You still get capacity by comparing amps
extracted per unit of time.
On Sep 9, 2017 09:26, "Ken Ryan" <keninalaska@gmail.com> wrote:
> A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp Carbon
> Pile Load Tester:
>
> https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html
>
> I thought that this is what we would use to annually test the capacity of
> our batteries. I thought that we would connect the battery, set the amps to
> our expected load (for example, 12 amps) and then time how long until
> battery voltage reaches an unacceptably low level.
>
> But, upon reviewing the user manual for this tool, it does not look like
> that is what this thing is for. It appears to just load the battery for a
> short period of time and then extrapolate the battery condition based on
> how it behaves for that very short test period.
>
> What's the deal? How do we use this tool to check on our battery
> condition, annually?
>
> Ken
>
>
Message 7
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
Don,
Thanks for the West Mountain CBA info. One possible problem I see with
using the carbon pile is that the algorithms used to derive capacity are
probably based on lead acid batteries, not LiFePO batteries. Aren't the
discharge characteristics of Li batteries radically different from lead
acid batteries?
Ken
On Sat, Sep 9, 2017 at 8:42 AM, don van santen <donvansanten@gmail.com>
wrote:
> Ken,
> The device tbat would test the battery the way you thought is a West
> Mountain CBA. The carbon pile is set at a much higher amp rate and draws
> the battery down very fast. You still get capacity by comparing amps
> extracted per unit of time.
>
> On Sep 9, 2017 09:26, "Ken Ryan" <keninalaska@gmail.com> wrote:
>
>> A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp Carbon
>> Pile Load Tester:
>>
>> https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html
>>
>> I thought that this is what we would use to annually test the capacity of
>> our batteries. I thought that we would connect the battery, set the amps to
>> our expected load (for example, 12 amps) and then time how long until
>> battery voltage reaches an unacceptably low level.
>>
>> But, upon reviewing the user manual for this tool, it does not look like
>> that is what this thing is for. It appears to just load the battery for a
>> short period of time and then extrapolate the battery condition based on
>> how it behaves for that very short test period.
>>
>> What's the deal? How do we use this tool to check on our battery
>> condition, annually?
>>
>> Ken
>>
>>
Message 8
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
The discharge characteristics are not dirrerent enough to cause a problem
using the carbon pile. If you try the pile be careful, they get quite hot.
I prefer to use the CBA, but it takes many hours to discharge to 10 volts.
On Sep 9, 2017 10:42 AM, "Ken Ryan" <keninalaska@gmail.com> wrote:
> Don,
> Thanks for the West Mountain CBA info. One possible problem I see with
> using the carbon pile is that the algorithms used to derive capacity are
> probably based on lead acid batteries, not LiFePO batteries. Aren't the
> discharge characteristics of Li batteries radically different from lead
> acid batteries?
> Ken
>
> On Sat, Sep 9, 2017 at 8:42 AM, don van santen <donvansanten@gmail.com>
> wrote:
>
>> Ken,
>> The device tbat would test the battery the way you thought is a West
>> Mountain CBA. The carbon pile is set at a much higher amp rate and draws
>> the battery down very fast. You still get capacity by comparing amps
>> extracted per unit of time.
>>
>> On Sep 9, 2017 09:26, "Ken Ryan" <keninalaska@gmail.com> wrote:
>>
>>> A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp
>>> Carbon Pile Load Tester:
>>>
>>> https://www.harborfreight.com/500-amp-carbon-pile-load-tester-91129.html
>>>
>>> I thought that this is what we would use to annually test the capacity
>>> of our batteries. I thought that we would connect the battery, set the amps
>>> to our expected load (for example, 12 amps) and then time how long until
>>> battery voltage reaches an unacceptably low level.
>>>
>>> But, upon reviewing the user manual for this tool, it does not look like
>>> that is what this thing is for. It appears to just load the battery for a
>>> short period of time and then extrapolate the battery condition based on
>>> how it behaves for that very short test period.
>>>
>>> What's the deal? How do we use this tool to check on our battery
>>> condition, annually?
>>>
>>> Ken
>>>
>>>
>
Message 9
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
Well, an single SLA has very different amp-hour ratings depending on the
discharge rate. And 'consumer' SLAs (PC680, etc that were originally
intended for watercraft, and others that some of us use that were intended
for UPSs and/or electric carts, etc) are rated differently from the
certified a/c SLAs, if I've read spec sheets correctly.
The most common LiFePO discussed here claims to maintain its rated AH
output at the AH number for one hour. The consumer SLAs most of us are
using won't do that; they'll only go for about 40% of their rating if
loaded to the max. Some of the early offerings for starting batteries using
lithium chemistry wouldn't go for more than a few minutes at their full
labeled rating.
But maybe if all are only loaded for a small number of seconds, you can
still derive useful info. Is that really the case?
On Sat, Sep 9, 2017 at 1:21 PM, don van santen <donvansanten@gmail.com>
wrote:
> The discharge characteristics are not dirrerent enough to cause a problem
> using the carbon pile. If you try the pile be careful, they get quite hot.
> I prefer to use the CBA, but it takes many hours to discharge to 10 volts.
>
> On Sep 9, 2017 10:42 AM, "Ken Ryan" <keninalaska@gmail.com> wrote:
>
>> Don,
>> Thanks for the West Mountain CBA info. One possible problem I see with
>> using the carbon pile is that the algorithms used to derive capacity are
>> probably based on lead acid batteries, not LiFePO batteries. Aren't the
>> discharge characteristics of Li batteries radically different from lead
>> acid batteries?
>> Ken
>>
>> On Sat, Sep 9, 2017 at 8:42 AM, don van santen <donvansanten@gmail.com>
>> wrote:
>>
>>> Ken,
>>> The device tbat would test the battery the way you thought is a West
>>> Mountain CBA. The carbon pile is set at a much higher amp rate and draws
>>> the battery down very fast. You still get capacity by comparing amps
>>> extracted per unit of time.
>>>
>>> On Sep 9, 2017 09:26, "Ken Ryan" <keninalaska@gmail.com> wrote:
>>>
>>>> A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp
>>>> Carbon Pile Load Tester:
>>>>
>>>> https://www.harborfreight.com/500-amp-carbon-pile-load-teste
>>>> r-91129.html
>>>>
>>>> I thought that this is what we would use to annually test the capacity
>>>> of our batteries. I thought that we would connect the battery, set the amps
>>>> to our expected load (for example, 12 amps) and then time how long until
>>>> battery voltage reaches an unacceptably low level.
>>>>
>>>> But, upon reviewing the user manual for this tool, it does not look
>>>> like that is what this thing is for. It appears to just load the battery
>>>> for a short period of time and then extrapolate the battery condition based
>>>> on how it behaves for that very short test period.
>>>>
>>>> What's the deal? How do we use this tool to check on our battery
>>>> condition, annually?
>>>>
>>>> Ken
>>>>
>>>>
>>
Message 10
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| Subject: | Re: Alternators - To Fuse or not to fuse - That |
IS the question
The first test (new batt) is the baseline. Latter tests let you see
performance dropoff. So yes you an obtain useful information even though
the device dors not perfectly match the batteries discharge
characteristics. Again, I prefer the West Mountain CBA, even if it takes 10
hours per test.
On Sep 9, 2017 13:29, "Charlie England" <ceengland7@gmail.com> wrote:
> Well, an single SLA has very different amp-hour ratings depending on the
> discharge rate. And 'consumer' SLAs (PC680, etc that were originally
> intended for watercraft, and others that some of us use that were intended
> for UPSs and/or electric carts, etc) are rated differently from the
> certified a/c SLAs, if I've read spec sheets correctly.
>
> The most common LiFePO discussed here claims to maintain its rated AH
> output at the AH number for one hour. The consumer SLAs most of us are
> using won't do that; they'll only go for about 40% of their rating if
> loaded to the max. Some of the early offerings for starting batteries using
> lithium chemistry wouldn't go for more than a few minutes at their full
> labeled rating.
>
> But maybe if all are only loaded for a small number of seconds, you can
> still derive useful info. Is that really the case?
>
> On Sat, Sep 9, 2017 at 1:21 PM, don van santen <donvansanten@gmail.com>
> wrote:
>
>> The discharge characteristics are not dirrerent enough to cause a problem
>> using the carbon pile. If you try the pile be careful, they get quite hot.
>> I prefer to use the CBA, but it takes many hours to discharge to 10 volts.
>>
>> On Sep 9, 2017 10:42 AM, "Ken Ryan" <keninalaska@gmail.com> wrote:
>>
>>> Don,
>>> Thanks for the West Mountain CBA info. One possible problem I see with
>>> using the carbon pile is that the algorithms used to derive capacity are
>>> probably based on lead acid batteries, not LiFePO batteries. Aren't the
>>> discharge characteristics of Li batteries radically different from lead
>>> acid batteries?
>>> Ken
>>>
>>> On Sat, Sep 9, 2017 at 8:42 AM, don van santen <donvansanten@gmail.com>
>>> wrote:
>>>
>>>> Ken,
>>>> The device tbat would test the battery the way you thought is a West
>>>> Mountain CBA. The carbon pile is set at a much higher amp rate and draws
>>>> the battery down very fast. You still get capacity by comparing amps
>>>> extracted per unit of time.
>>>>
>>>> On Sep 9, 2017 09:26, "Ken Ryan" <keninalaska@gmail.com> wrote:
>>>>
>>>>> A few weeks (?) ago, Bob posted a link to a Harbor Freight 500 Amp
>>>>> Carbon Pile Load Tester:
>>>>>
>>>>> https://www.harborfreight.com/500-amp-carbon-pile-load-teste
>>>>> r-91129.html
>>>>>
>>>>> I thought that this is what we would use to annually test the capacity
>>>>> of our batteries. I thought that we would connect the battery, set the amps
>>>>> to our expected load (for example, 12 amps) and then time how long until
>>>>> battery voltage reaches an unacceptably low level.
>>>>>
>>>>> But, upon reviewing the user manual for this tool, it does not look
>>>>> like that is what this thing is for. It appears to just load the battery
>>>>> for a short period of time and then extrapolate the battery condition based
>>>>> on how it behaves for that very short test period.
>>>>>
>>>>> What's the deal? How do we use this tool to check on our battery
>>>>> condition, annually?
>>>>>
>>>>> Ken
>>>>>
>>>>>
>>>
>
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