Today's Message Index:
----------------------
1. 06:16 AM - Cut and Paste ()
2. 06:16 AM - High fuel pressure ()
3. 06:55 AM - Re: Surface temperature sensor (Chris Stone)
4. 06:56 AM - Re: Re: Surface temperature sensor ()
5. 07:16 AM - Re: Diode confusion (Robert L. Nuckolls, III)
6. 07:22 AM - Re: Re: S704-1 on Hot Side of Firewall? (Robert L. Nuckolls, III)
7. 07:27 AM - Re: Re: Re: Designing a circuit question (Robert L. Nuckolls, III)
8. 07:44 AM - Re: Re: Re: Designing a circuit question (Glaeser, Dennis)
9. 07:51 AM - Re: Future of general aviation (Robert L. Nuckolls, III)
10. 08:25 AM - Re: Future of general aviation (David LLoyd)
11. 10:13 AM - Diode confusion (Lincoln Keill)
12. 11:44 AM - Re: Surface temperature sensor (Dj Merrill)
13. 11:48 AM - Re: Re: Re: Re: Designing a circuit question (Dj Merrill)
14. 12:05 PM - Proper SWR meter (Mike Welch)
15. 12:46 PM - Re: Proper SWR meter (Dj Merrill)
16. 01:21 PM - Re: Surface temperature sensor (J. Mcculley)
17. 01:43 PM - Re: Proper SWR meter (Mike Welch)
18. 02:14 PM - Re: Proper SWR meter (Dj Merrill)
19. 03:00 PM - Re: Proper SWR meter (Mike Welch)
20. 03:09 PM - Re: Proper SWR meter (The Kuffels)
21. 04:14 PM - Re: Alternator field feed - fuse vs. fusible link (Noah)
22. 06:06 PM - Re: Proper SWR meter (Mike Welch)
23. 06:06 PM - KNS 80 Installation Manual (Dave)
24. 06:16 PM - Re: Battery chargers. (Robert L. Nuckolls, III)
25. 06:26 PM - Re: Proper SWR meter (Robert L. Nuckolls, III)
26. 07:50 PM - Re: Alternator field feed - fuse vs. fusible link (rckol)
27. 09:49 PM - Re: Proper SWR meter (The Kuffels)
Message 1
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4/21/2010
People, People, People, Can't anybody here cut and paste?
This morning's aeroelectric digest had four cases where the poster just hit
reply to the 4/20/2010 digest and replied with his posting. This meant that
the entire 4/20/2010 digest got regurgitated, reposted, and archived four
times -- what a waste of bandwidth. And what a frustration and nuisance to
attempt to pick out and read today's new postings amongst all that
unnecessary repitition.
Please, Please, Please, cut and paste as appropriate before sending -- thank
you.
Do not archive.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
Message 2
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Subject: | High fuel pressure |
4/22/2010
Hello Jerry, Like other suggestions I suggest that you look to the fuel
pressure transducer.
The fuel pressure on my TCM IO-240 B9B engine suddenly went from the 9 PSI
range to 54 PSI as reported by my Vision Microsystems engine data
instrumentation system.
In the process of disconnecting the transducer electrical plug for trouble
shooting and reconnecting it the problem disappeared. Evidently some
vibration or corrosion had opened one of the four connections.
The trouble shooting and self curing saved me $400.00 for a new transducer.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
===================================================
Time: 08:48:57 AM PST US
Subject: AeroElectric-List: High fuel pressure
From: jerry2dt@aol.com
Folks,
Re-posting from VAF, no joy over there but hope there might be someone her
e with an idea...
Normally my fuel pressure with the mech pump runs 30-35 psi and with the
boost on goes to 40-ish. Suddenly the other day I got a warning on my GRT
EFIS when the pressure went to 190 psi and that has continued since, so
am very reluctant to fly until this is sorted out. No engine stumbles or
anything otherwise abnormal. Fuel flow is fine.
This is an injected Bendix system on an IO-360 with 160 trouble free hours
since new.
I've never heard of this before, so if anyone here has ideas, advice, answ
ers, please respond.
BTW, I love that the EFIS picked this out for me and sent up the flag, ver
y handy.
Thanks all,
Jerry Cochran
Message 3
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Subject: | Re: Surface temperature sensor |
Thermocouples are quite small. I would think a piece of aluminum tape over the
thermocouple onto the oil filter would get you a very accurate temp reading.
chris stone
>
>Do Not Archive
>
>Thanks IRA,
>
>Yes, I'll do some digging. I was thinking about something with a flat
>profile and perhaps a stick on for a flat surface. There must be
>somebody putting out a device that can be fastened to a flat surface
>that has two wires sticking out of it.
>
>Glenn
>
>Do Not Archive
>
>-----Original Message-----
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
>rampil
>Sent: Wednesday, April 21, 2010 4:11 PM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: Re: Surface temperature sensor
>
>
>Ahhhh, how bout a thermocouple? how bout a resistive probe like
>many engines use for CHT. This discussion group is replete with temp.
>monitoring
>
>--------
>Ira N224XS
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=295140#295140
>
>
Message 4
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Subject: | Re: Surface temperature sensor |
Thanks all for the suggestions. Time to experiment.
Glenn
Do Not Archive.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Thursday, April 22, 2010 1:58 AM
Subject: RE: AeroElectric-List: Re: Surface temperature sensor
<nuckolls.bob@aeroelectric.com>
At 03:58 PM 4/21/2010, you wrote:
>
>Do Not Archive
>
>Thanks IRA,
>
>Yes, I'll do some digging. I was thinking about something with a flat
>profile and perhaps a stick on for a flat surface. There must be
>somebody putting out a device that can be fastened to a flat surface
>that has two wires sticking out of it.
We usually use a thermocouple wire and stick it to
the surface with some epoxy. If you don't have
a thermocouple reading instrument, you can rig
a direct reading semiconductor sensor like the
the LM285. It's powered up directly from your
14v system through a 10K resistor and reads
directly in degrees Kelvin. It's in the shape
of a plastic TO92 transistor with a flat side
easily bonded to the surface of interest.
You can read it's measurement directly on
a multimeter where 2.75 volts is equal to
275 degrees K.
Very handy for a quick-n-dirty look-see.
Radio Shack and Harbor Freight both stock
temperature reading multimeters based on
type K thermocouple wire.
Bob . . .
Message 5
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Subject: | Re: Diode confusion |
>My question:
>
>For a functioning diode, shouldn't current flow from the red lead of
>the multimeter when it's placed on the non-band side of the diode,
>to the black lead of the multimeter when it's on the band-side of
>the diode and indicate zero (or very little resistance)?
>
>Thanks to whoever can set me straight on this ridiculously simple concept.
Not all multimeters are the same. I have instruments
wherein the electron-flows are reversed from each other.
While the exercise you describe is a learning moment,
the last time I saw a "bad" diode either in terms of
markings or electrical condition was many moons ago.
Just know that there is no "standard" for choosing
polarity of a multimeter's resistance measurement
current.
Bob . . .
Message 6
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Subject: | Re: S704-1 on Hot Side of Firewall? |
At 10:03 PM 4/21/2010, you wrote:
>
>Thanks Bob. Prior to your response, I moved the battery bus and
>E-bus relay south of the firewall on my schematic. I think I like
>that better anyway. Roughly the same number of wires transiting the
>firewall feed-thru. Does require a fusible link on the battery bus
>feed however.
. . . on the battery bus feed? Fusible links are
ROBUST protection on the order of ANL type current
limiters and should not be used in an always-hot feed
from a battery. Everything coming off the battery
should be a 7A or less fuse except where you need
a robust alternate path for the e-bus. In that case,
the battery bus fuse size goes up accordingly but the
e-bus relay becomes a "mini battery contactor" for
the e-bus . . . and should be as close as practical
to the battery bus.
Bob . . .
Message 7
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Subject: | RE: RE: Designing a circuit question |
At 08:50 PM 4/21/2010, you wrote:
>Dennis,
>
> Upon close inspection of the current in Bob's design, yup, you're
> right about the current direction.
>
> Back to my idea. I suppose the ammeter might not be too bad of a
> direction to go, but I still like the idea of a line of 5-6 LEDs,
> which is an indication of the prop's motor current load. Would
> this be a simple circuit, and very importantly, can it be a
> modification to the one Bob came up with? I can sure see an
> advantage to a combo circuit.....one that shows you visually that
> you are increasing the current, and eventually the final LED,
> indicating near max current?
There are integrated circuits designed to
drive a totem pole of leds. They're common
to many audio systems where a solid state
"VU Meter" is implemented with a gaggle of
leds. See:
http://www.national.com/ds/LM/LM3915.pdf#page=1
You would need a shunt, an op-amp signal
conditioner and the LM3915. This is not
a trivial task to configure. The analog meter
and shunt would be much simpler to implement.
One of our miniature loadmeters could be combined
with a custom shunt.
Bob . . .
Message 8
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Subject: | RE: RE: RE: Designing a circuit question |
Mike,
I think there are ammeters that have LED indicators - but I am definitely NOT the
expert on such things. It wouldn't be a mod to Bob's circuit. You could have
both an ammeter to show the increasing current and Bob's circuit to indicate
and limit max current.
Dennis
----------------------------------------------------
From: Mike Welch
Dennis,
Upon close inspection of the current in Bob's design, yup, you're right about the
current direction.
Back to my idea. I suppose the ammeter might not be too bad of a direction to
go, but I still like the idea of a line of 5-6 LEDs, which is an indication of
the prop's motor current load. Would this be a simple circuit, and very importantly,
can it be a modification to the one Bob came up with? I can sure see
an advantage to a combo circuit.....one that shows you visually that you are
increasing the current, and eventually the final LED, indicating near max current?
Mike Welch
Message 9
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Subject: | Re: Future of general aviation |
>We all need to contribute to the continuance of this legacy by
>supporting programs like Young Eagles, encouraging youth who express
>interest in what we do, participating in information exchange forums
>like this one, and never taking the privilege of flying for granted.
I fear that the inoculation for indifference may be more
complicated that enthusiastic offers of airplane rides.
Our culture is slowly loosing its curiosity and excitement
as to how and why things work. There's more interest in
stepping up to the next revision of "Borg Wars" or
seeking out the most outrageous roller coaster. The
perpetual quest for transient pleasures is winning out
over the joy of finding things out.
Young Eagles is a fine idea but it's also a "process"
enthusiastically endorsed by folks who think education
is "flip switch A, insert tab C into slot D, watch
video F, etc".
Real teaching is a meeting of the minds, an exchange
of concepts and a study of recipes for success crafted
of simple-ideas.
My grandson doesn't know what he's in for. We're going
to cook, grow, build, design, cut metal, photoshop,
autocad, cut wood, take things apart, put them back
together and explore the simple-ideas that are discovered
in the process. Exactly how he uses these experiences
will ultimately be up to him. But without having peeked
behind all those doors, how can he make well considered
choices?
Our contemporaries have, I suspect, not peeked behind
many doors . . . their teachers (which includes EVERY
adult interaction in their younger lives) have failed
them. I have the signatures of more than 50 young eagles
in my logbook . . . I'll bet not one of them has set
foot back in an airplane . . . unless it was at the
NEXT air show where free rides were offered again.
That "privilege" thing is closely related to what
doors have been peeked into. Present trends plotted
into the future suggest that ANY privilege we now
enjoy can disappear any time with the mere stroke
of a pen in Washington.
Bob . . .
Message 10
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Subject: | Re: Future of general aviation |
The simple truth of things was elegantly set in your words....Thanks.
However, too few will read nor understand. And, even fewer will act.
Unfortunately, it covers more than just future aviation.
Now we know what probably happened to the Romans, even after removing the
influence of their lead pipe system from the equation.
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Thursday, April 22, 2010 7:51 AM
Subject: Re: AeroElectric-List: Future of general aviation
> <nuckolls.bob@aeroelectric.com>
>
>
>>We all need to contribute to the continuance of this legacy by supporting
>>programs like Young Eagles, encouraging youth who express interest in what
>>we do, participating in information exchange forums like this one, and
>>never taking the privilege of flying for granted.
>
> I fear that the inoculation for indifference may be more
> complicated that enthusiastic offers of airplane rides.
> Our culture is slowly loosing its curiosity and excitement
> as to how and why things work. There's more interest in
> stepping up to the next revision of "Borg Wars" or
> seeking out the most outrageous roller coaster. The
> perpetual quest for transient pleasures is winning out
> over the joy of finding things out.
>
> Young Eagles is a fine idea but it's also a "process"
> enthusiastically endorsed by folks who think education
> is "flip switch A, insert tab C into slot D, watch
> video F, etc".
>
> Real teaching is a meeting of the minds, an exchange
> of concepts and a study of recipes for success crafted
> of simple-ideas.
>
> My grandson doesn't know what he's in for. We're going
> to cook, grow, build, design, cut metal, photoshop,
> autocad, cut wood, take things apart, put them back
> together and explore the simple-ideas that are discovered
> in the process. Exactly how he uses these experiences
> will ultimately be up to him. But without having peeked
> behind all those doors, how can he make well considered
> choices?
>
> Our contemporaries have, I suspect, not peeked behind
> many doors . . . their teachers (which includes EVERY
> adult interaction in their younger lives) have failed
> them. I have the signatures of more than 50 young eagles
> in my logbook . . . I'll bet not one of them has set
> foot back in an airplane . . . unless it was at the
> NEXT air show where free rides were offered again.
>
> That "privilege" thing is closely related to what
> doors have been peeked into. Present trends plotted
> into the future suggest that ANY privilege we now
> enjoy can disappear any time with the mere stroke
> of a pen in Washington.
>
> Bob . . .
>
>
>
Message 11
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Bob S. --
Thanks for the great tip -- I haven't been to the EAA site for some time an
d those instructional videos are fantastic. -I watched all of the ones un
der the "Electrical" tab plus a few more and learned a bunch...wish I'd don
e that a lot earlier. -These videos are the perfect complement to the AEC
-- being able to actually watch someone demonstrate the correct way to cri
mp a BNC connector onto a piece of RG-58, solder a wire onto a switch (pre-
tinning wire...what a concept!), crimp on a molex connector pin and them re
move it from its housing, strip shielded cable, etc., etc. makes reading th
e AEC a more enjoyable and understandable experience.-
I always knew that alternators were lighter than generators, but never knew
that an alternator starts producing voltage around 700 RPM (compared to a
generator's cut-in speed of 1500 RPM) which is why we no longer have to dis
charge our batteries taxiing around at idle power. -Did you know there ar
e no special tools required to fabricate Aeroquip hoses?...I didn't until t
oday. -When you flare a tube, you should use lubricant identical to the f
luid the tubing will carry...never thought about that....makes sense. -Al
l in all, a great resource for those of us still on the steep side of the l
earning curve.
Thanks again Bob.
Linc
Check the EAA.ORG website under hints for homebuilders electrical.- They
have a
nice video with an instructor demonstrating exactly what you are asking abo
ut.
It will clear things up for you.-
Bob S.
Message 12
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Subject: | Re: Surface temperature sensor |
On 04/21/2010 01:42 PM, longg@pjm.com wrote:
> Has anyone come across an example of a surface temperature sensor
> (generic)) that could be used on engine parts or perhaps the firewall
> and send a digital reading back to the panel?
Tons of digital thermometers with remote wireless sensors are available
in Home and Garden sections of retail stores.
Not a recommendation, but here is one example:
http://www.amazon.com/Crosse-Technology-Digital-Thermometer-Wireless/dp/B001DNIIOS/ref=sr_1_2?ie=UTF8&s=home-garden&qid=1271961133&sr=8-2
<http://www.amazon.com/Crosse-Technology-Digital-Thermometer-Wireless/dp/B001DNIIOS/ref=sr_1_2?ie=UTF8&s=home-garden&qid=1271961133&sr=8-2>
Drop by your local Walmart, Home Depot, or Lowes and I'm sure you can
find plenty to choose from.
Probably not too hard to tear apart the remote sensor housing and get
to the actual sensor itself to attach it directly to something.
-Dj
--
Dj Merrill - N1JOV
Glastar Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Grumman Yankee Driver N9870L - http://deej.net/yankee/
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Subject: | Re: RE: RE: RE: Designing a circuit question |
Ivo does offer a constant speed option which might be worth considering:
http://www.ivoprop.com/constant.htm
Building your own might be fun, too, and since I'm thinking of an
electric IVO I am also interested to see what you come up with. :-)
-Dj
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Subject: | Proper SWR meter |
Electric gurus=2C
I've got an SWR meter I borrowed from a neighbor who's a HAM radio buff.
The SWR meter is a Lafayette=2C stock no. 99-25835. I'm waiting for the b
nc/pl259 adapter to get here tomorrow=2C before I can use it. (It has the
bnc male/PL259 adapter to hook it up to my Icom A200).
It was suggested to me to make sure it is the "right frequency meter"=2C
to be able to properly check for standing waves. I wasn't aware of that as
pect of an SWR meter.
Does anyone know if this meter can properly check the standing waves on f
requencies of an aircraft radio/antenna? It only refers to "amateur ra
dio stations".
Thanks=2C
Mike Welch
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Subject: | Re: Proper SWR meter |
On 04/22/2010 03:00 PM, Mike Welch wrote:
> The SWR meter is a Lafayette, stock no. 99-25835.
>
>
> Does anyone know if this meter can properly check the standing waves
> on frequencies of an aircraft radio/antenna? It only refers to
> "amateur radio stations".
I was unable to find the exact specs for this unit, but I found a forum
thread on it here:
http://forums.qrz.com/showthread.php?t=88199
If that thread is true, then if you are looking for a relative reading
(ie, a maximum or minimum reading), it might be okay. If you are
looking for an exact correct numerical reading, then no.
Typically, if you are tuning an antenna you are looking for a minimum
reading, so it would probably be okay. Tune, check SWR, tune, check
SWR, etc.
If you are inserting this inline to check the SWR reading of an
existing antenna installation and need an accurate number, then it
probably won't do you much good on aircraft freqs.
-Dj
--
Dj Merrill - N1JOV
Glastar Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Grumman Yankee Driver N9870L - http://deej.net/yankee/
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Subject: | Re: Surface temperature sensor |
I've been using a very inexpensive system with 18 sensor locations in my
Wittman Tailwind for well over 500 hours and 7 years, with never a
malfunction. It's based on inexpensive thermistors available from most
electronics suppliers and feeds into the display head of an ordinary
digital meat thermometer mounted on my instrument panel. It can handle
up to 300 degree F which covers everything firewall-forward except
engine cylinder EGT and CHT.
If you want some part numbers and more details contact me off list at
mcculleyja@starpower.net.
Jim McCulley
===================================================================================
longg@pjm.com wrote:
>
>
> Q,
>
>
>
> Has anyone come across an example of a surface temperature sensor
> (generic)) that could be used on engine parts or perhaps the firewall
> and send a digital reading back to the panel?
>
>
>
> Example. I would like to measure the temperature on the surface of my
> oil filter/fuel pump and display that value on the panel.
>
>
>
> FYI I have stick-on thermometers that work great when performing
> engine checks on the ground but they are of little use in the air.
>
>
>
> Thanks,
>
>
>
> Glenn
>
>
>
>
>
> *
>
>
> *
Message 17
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Subject: | Proper SWR meter |
> Typically=2C if you are tuning an antenna you are looking for a minimum
> reading=2C so it would probably be okay. Tune=2C check SWR=2C tune=2C che
ck
> SWR=2C etc.
> -Dj
Thanks for the reply=2C DJ.
After reading some of those comments on it=2C now I'm concerned it may da
mage my Icom A200.
The antenna I was planning on checking with it is my recently constructed
"copper foil groundplane" antenna.
I have plugged the antenna into the radio=2C and the local airport unicom
replied with a "loud and clear"=2C but they are only 1/3 of a mile away.
Should I not risk screwing up my Icom=2C and try to find a more appropria
te SWR meter?
Thanks=2C
Mike Welch
GlaStar and Kolb MkIIIX builder
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Message 18
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Subject: | Re: Proper SWR meter |
On 04/22/2010 04:25 PM, Mike Welch wrote:
> Should I not risk screwing up my Icom, and try to find a more
> appropriate SWR meter?
I do not know anything about that particular SWR meter, so I can't say
for sure. If you can find an SWR meter that covers the amateur radio
144Mhz band, that would probably be close enough so that you can tune
your antenna. Any local amateur radio operators in your area? I'm sure
they'd come out and help you for free just to see a cool project like an
airplane being built. :-)
Try looking here:
http://www.qrz.com/db/?cmd=1
and then look up their name in the phone book and give them a call.
-Dj
--
Dj Merrill - N1JOV
Glastar Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Grumman Yankee Driver N9870L - http://deej.net/yankee/
Message 19
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Subject: | Proper SWR meter |
>Any local amateur radio operators in your area? I'm sure
> they'd come out and help you for free just to see a cool project like an
> airplane being built. :-)
> -Dj
DJ=2C
Re: ham radio operators=2C yes. That's where I got this SWR meter from.
Like I said in my original email=2C the instruction manual only refers to
"amateur radios".
Sounds to me as though I should be okay. I'll get the adapter from Radio
Shack tomorrow=2C and give it a try.
Mike Welch
GlaStar and MkIIIX builder
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Subject: | Re: Proper SWR meter |
Mike,
<< SWR meter is a Lafayette, stock no. 99-25835. .. the "right
frequency meter >>
Lafayette isn't known for excellence in design. There are two problems
with the meter you mention. First it is specified for use only up to
about 30 MHz, one fourth the frequency of the aviation communication
band around 120 MHz. As DJ mentions, it might be able to determine a
minimum bad. But personally, I wouldn't trust it. And for sure it
wouldn't tell you about the performance of your antenna near the band
edges, which is just as important as the "minimum" frequency.
Second, to work you must *transmit* power on the frequencies of
interest, a practice frowned upon by the FAA and the FCC unless you are
communicating with someone. Current practice says to use an input noise
bridge antenna analyzer such as sold by MFJ. Contact your local ham
radio club. They will probably have one as part of the club's
equipment. Even if not, for sure one of their members will have one and
be delighted to come over and help you tune/analyze your setup.
To find your local ham club log on to arrl.org. In the upper right hand
corner is a website search box. Select the Category "Clubs" and press
Go. This takes you to a clubs page. On the left side enter your Zip
code, select the desired mileage range next to it and press Search at
the bottom of this grey box. Or fly up to Whitefish Montana and I'll be
happy to help you.
Tom Kuffel, AL7AU
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Subject: | Re: Alternator field feed - fuse vs. fusible link |
Great response Bob, thank you. That certainly drives the point home!
--------
Highest Regards,
Noah Forden
RV-7A
Rhode Island
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295325#295325
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Subject: | RE: Proper SWR meter |
Tom=2C
Thanks for the tips. I'll see if I can find a local ham operator guy to
help get me squared away.
If I came up to Whitefish=2C MT=2C I wouldn't have time to deal with the
antenna....with my fishin' taking up all my time. :-)
Thanks again=2C Mike Welch
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Subject: | KNS 80 Installation Manual |
My friend/mechanic (not on the list) is installing a kns 80 and needs
the installation manual. I found the connector pinout on Bob's Website,
But he would like to see the complete installation manual. Does anyone
has access to an installation manual ?
Thanks
Dave
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Subject: | Re: Battery chargers. |
At 06:35 PM 4/19/2010, you wrote:
>Read this link an tell me your
>comments. News to me.
>
>
>http://www.optimabatteries.com/product_support/resuscitating_agmbattery.php
"Resuscitation" is not a narrowly defined operation.
When an RG battery is so severely discharged that
its open circuit voltage is too low to tell a smart
charger to wake up, its a common practice to add an
extra boost from either another battery or perhaps
some form of bench supply.
When Concorde gets a "dead" one back, they'll do
a recovery experiment that starts with hooking a
12v battery to a 20 or more volt power supply until
the chemistry is stirred up enough for the discharged
battery to start taking in energy. After the recovery
current rises sufficiently, the charge can be completed
with more conventional protocols.
They'll charge, discharge and recharge several times
while doing a cap-check during each discharge. If after
3 cycles, the cap-check does not show sufficient capacity
for return to service (typically 80% of nameplate) the
critter was scrapped.
Some would recover, some would not depending on how long
they were held in a discharged state, at what temperature
and what the age of the battery was. But aside from the
extra-voltage jum-start, no special techniques were used.
So when someone claims to have resurrected a dead battery,
it's not clear exactly to what degree the battery has
become useful. Without comparative cap-checks, there's
no quantitative basis for claiming ressurection.
Bob . . .
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Subject: | Re: Proper SWR meter |
At 04:59 PM 4/22/2010, you wrote:
>Mike,
>
><< SWR meter is a Lafayette, stock no. 99-25835. .. the "right
>frequency meter >>
>
>Lafayette isn't known for excellence in design. There are two
>problems with the meter you mention. First it is specified for use
>only up to about 30 MHz, one fourth the frequency of the aviation
>communication band around 120 MHz. As DJ mentions, it might be able
>to determine a minimum bad. But personally, I wouldn't trust
>it. And for sure it wouldn't tell you about the performance of your
>antenna near the band edges, which is just as important as the
>"minimum" frequency.
Agreed. I blew away a lot of $time$ building matching
harnesses "checked" with a similar transmission line
reflectometer of this genre . . .
Emacs!
Optimized for the 3-30 Mhz range, these critters become
VERY accommodating and tended to show that EVERYTHING you
attached to it at 145 Mhz had a good SWR!
> Second, to work you must *transmit* power on the frequencies of
> interest, a practice frowned upon by the FAA and the FCC unless you
> are communicating with someone. Current practice says to use an
> input noise bridge antenna analyzer such as sold by MFJ. Contact
> your local ham radio club. They will probably have one as part of
> the club's equipment. Even if not, for sure one of their members
> will have one and be delighted to come over and help you
> tune/analyze your setup.
Actually, the MFJ259 is an active emitter too but in
the milliwatt level. But the best part is that it's
ability to accurately display antenna and transmission
line characteristics is quite good at 130 Mhz.
I use to rent one to the OBAM aviation community but
wear and tear outgo was higher than rental income.
Bob . . .
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Subject: | Re: Alternator field feed - fuse vs. fusible link |
Just to play the Devil's advocate:
The breaker is part of an overvoltage protection circuit, not a conventional B
lead breaker prone to nuisance popping. Why would anyone be resetting this breaker
in flight after what is most likely an overvoltage event?
--------
rck
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295354#295354
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Subject: | Re: Proper SWR meter |
Me:
<< you must *transmit* power on the frequencies of interest, a practice
frowned upon by the FAA and the FCC unless you are communicating with
someone. >>
Bob:
<< Actually, the MFJ259 is an active emitter too but in the milliwatt
level. >>
Absolutely true, but in this context all receivers are "active
emitters". For example, Canadian police use a special receiver to
detect the miniscule signal emitted by radar detectors to enforce their
ban on such devices. The point being made is the amount of power needed
to operate the old style SWR meters *will* cause appreciable
interference to other users while the MFJ259 and such for all practical
purposes will not.
Tom Kuffel
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