Today's Message Index:
----------------------
1. 07:49 AM - Jhp 520 PTT cable (Danny)
2. 12:50 PM - Update on non TSO'd altitude encoders ()
3. 03:48 PM - Re: S-Tec 30 GPSS internal fuse (Robert L. Nuckolls, III)
4. 03:48 PM - Re: Jhp 520 PTT cable (Robert L. Nuckolls, III)
5. 03:50 PM - Re: S-Tec 30 GPSS internal fuse (Robert L. Nuckolls, III)
6. 04:17 PM - Re: Jhp 520 PTT cable (Danny)
7. 09:04 PM - Re: On the subject of checking voltage..... (jerb)
8. 09:04 PM - Re: Source for Schumacher 1562A (Jared Yates)
Message 1
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Subject: | Jhp 520 PTT cable |
Does anyone know where I could get a remote PTT switch that works properly
for this unit? I read in the archives that it does not take a PTT that grou
nds to talk.
-
I am uncertain about the note to "connect the PTT line to one of the other
lines".
Thanks.
- DjD=0A=0A=0A
Message 2
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Subject: | Update on non TSO'd altitude encoders |
3/27/2010
Mr. Baker, I do not have any new info on this subject. The FAA has not
issued any
statement regarding TSO equipment or installation either specifically
for encoders or for any other equipment on the aircraft. The question
has been asked many times to many FAA offices. Their response to date
has been the same - no response at all beyond "we'll get back to you".
I assure you that if we ever do get a response in writing that we can
publish, we will do so at once. It's a question that needs answering,
and we will continue to pursue an answer. Unfortunately, to date we
have not had any success in this endeavor.
Stay tuned! When we know something we'll get the word out pronto.
Joe Norris
EAA 113615 Lifetime
Homebuilders Community Manager
EAA-The Spirit of Aviation
Phone: 888.322.4636 Extension 6806
Fax: 920.426.4873
===========================================================
2/18/2010
Hello Mr. Norris, From time to time the subject of using a non TSO'd
altitude encoder in amateur built experimental aircraft comes up on the
Matronics aeroelectric list. Copied below is one of those postings. No
favorable response on this subject has ever been received from FAA
Headquarters.
Many more postings on this subject can be found by searching for "non TSO'd
altitude encoders" at this web site:
http://www.matronics.com/searching/ws_script.cgi
The last thing that I read from EAA to resolve this situation was a
suggestion that the builder just purchase and install a TSO'd altitude
encoder (in addition to the non TSO'd altitude encoder incorporated into the
EFIS) in order to meet the FAA requirements.
Do you have any additional information to add on this subject at this time?
Thank you,
Owen C. Baker
EAA 0073580
=============================================================
#32094
From: <bakerocb(at)cox.net>
Subject: encoder approval
Responding to a posting from Skip Simpson:
8/10/2006
Hello Skip, The issue on the use of non TSO'd altitude encoders is currently
under review (again) at FAA headquarters. I have been involved in this issue
for some time, but have refrained from posting any information on this
unresolved issue because of the potentially huge adverse impact upon our
amateur built community. I wanted to avoid much controversial and
distracting communications pending the, hopefully favorable, eventual ruling
by FAA on this subject. Here in a fairly brief summary form is the
situation:
1) FAR 91.217 Reads as follows: "Data correspondence between automatically
reported pressure altitude data and the pilot's altitude reference.
No person may operate any automatic pressure altitude reporting equipment
associated with a radar beacon transponder-
(a) When deactivation of that equipment is directed by ATC;
(b) Unless, as installed, that equipment was tested and calibrated to
transmit altitude data corresponding within 125 feet (on a 95 percent
probability basis) of the indicated or calibrated datum of the altimeter
normally used to maintain flight altitude, with that altimeter referenced to
29.92 inches of mercury for altitudes from sea level to the maximum
operating altitude of the aircraft; or
(c) Unless the altimeters and digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, respectively."
2) It would appear that any aircraft, standard type certificated or
experimentally certificated, whether flying IFR or VFR, and replying with a
mode C transponder altitude read out to ATC, either must comply with 91.217
(b) or be using a TSO-C88 approved altitude encoder.
3) Some companies providing altitude encoders to the amateur built
experimental aircraft community, some of which are incorporated into EFIS,
have been providing non TSO'd altitude encoders. It is not always made clear
by the manufacturing companies whether the altitude encoders within their
EFIS are TSO'd or not.
4) Some of these non TSO'd altitude encoders have better performance than
the TSO calls for both in terms of altitude granularity output and in output
format (serial instead of gray code).
5) There are many of these non TSO'd encoders in aircraft that are currently
flying and many in aircraft under construction.
6) A general presumption in the community was made (at least by those that
thought about it) that if an altimeter - altitude encoder - transponder
installation passed the FAR Part 43 Appendix E and F tests which are
required by FAR 91.411 and 91.413 every two years, that FAR 91.217 (b) was
being complied with.
7) A ruling from FAA headquarters in response to a letter from me said "not
so" to such compliance interpretation in the following fashion:
"Your letter posed the following questions:
1. If an amateur built experimental aircraft has an installed TSO'd ATC
transponder as required by Title 14 Code of Federal Regulations (14 CFR)
section 91.215, but a non-TSO'd altitude encoder and the installation has
passed the test and inspection requirements of 14 CFR sections 91.411 and
91.413 within the preceding 24 calendar months, does the installation meet
the requirements of 14 CFR section 91.217(b), and therefore make that
installation acceptable for IFR operations?
2. If the answer to question one is No, can you please tell me
why?
The answer to question one is "No." The testing required to show the
transmitted altitude data corresponds within 125 feet (on a 95 percent
probability basis) is more rigorous than the requirements referenced in 14
CFR sections 91.411, 91.413, and 14 CFR, part 43 appendices E and F. The
tests required by 14 CFR part 43 appendix E(c) measure the automatic
pressure altitude at a sufficient number of test points to ensure the
altitude reporting equipment performs its intended function.
Title 14 CFR section 91.217 paragraphs (b) and (c), state that pressure
altitude reporting equipment must be tested and calibrated to transmit
altitude data correspondence within stated specifications; or, the
altimeters and digitizers must meet the standards in TSO-C10B and TSO-C88,
respectively.
Should the owner/operator elect to exhibit compliance with tests and
calibration provided in 14 CFR section 91.217(b), a test method would need
to be developed that
ensures the transmitted data corresponds within 125 feet of the indicated
altitudes from sea level to the maximum operating altitude of the aircraft
on a 95 percent probability basis. This testing also needs to ensure the
performance characteristics of the equipment are not impacted when
subjected to environmental conditions (voltage fluctuations temperature,
vibration, etc.) which may be encountered in airborne operations.
Completed tests and calibration results should be maintained in the
aircraft records.
Thank you for your interest in aviation safety."
8) You can see the tremendous impact that enforcement of such a position
would have on the companies making and selling non TSO'd encoders or EFIS
containing non TSO'd encoders, the airplanes under construction planning to
incorporate those EFIS, and all of those airplanes currently flying with non
TSO'd altitude encoders.
9) I did not accept the FAA's position in 7) above as the final word and am
working through a cooperating local FAA FSDO employee to both educate FAA
headquarters and to get them to adopt a more reasonable position on the use
of non TSO'd altitude encoders.
10) I would encouage our community to not react in an adverse manner to the
FAA's current position and to continue to work the issue on a cooperative
basis. I will post additional information as it becomes available and
attempt to answer any questions that you may have.
OC -- The best investment we will ever make is in gathering knowledge.
===================================================
From: CardinalNSB(at)aol.com
Subject: AeroElectric-List: Re: encoder approval
Is the Rocky Mountain encoder approved for certificated aircraft, the
factory says that "it conforms to c88a", is that enough, or is there more
needed.
Any opinions on the unit. Thanks, Skip Simpson>>
Message 3
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Subject: | S-Tec 30 GPSS internal fuse |
At 01:01 PM 3/26/2010, you wrote:
>
>I seem to recall that DO-178 covers software only.
>
>DO-160 handles the electro-wizzies.
>
>I could be wrong though.
You are correct.
Bob . . .
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Subject: | Re: Jhp 520 PTT cable |
At 09:43 AM 3/27/2010, you wrote:
>Does anyone know where I could get a remote PTT switch that works
>properly for this unit? I read in the archives that it does not take
>a PTT that grounds to talk.
>
>I am uncertain about the note to "connect the PTT line to one of the
>other lines".
Where do you see this 'note'?
Bob . . .
Message 5
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Subject: | Re: S-Tec 30 GPSS internal fuse |
At 12:48 PM 3/26/2010, you wrote:
><recapen@earthlink.net>
>
>I called their tech support...their guy told me it is a 1/2A Slo-Blo
>surface mount fuse.
>
>We then talked about what could cause this thing to go.....which led
>to my education on how these units interact with each other.
>
>The 10VDC that this fuse protects is used to excite the heading
>system - in my case a Century NSD 1000 HSI.
>
>Back to checking my wiring for shorts...didn't find any last time -
>but I'll still check...55hrs without a blip.
Aha! It did not occur to me that the fuse could be
protecting the GPSS innards as a power source
as opposed to a load.
It makes sense that if you burden the internal
power supply with both internal and external
duties, it might be well to protect that output.
What you might consider is a temporary 10vdc power
supply with an LED indicator that annunciates
an overload. This could be wired around the GPSS.
You could do this with "jelly bean" parts.
Bob . . .
Message 6
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Subject: | Re: Jhp 520 PTT cable |
Bob,
I get hits on "JRC".- The message is below...
Thanks.
- DjD
-
-
Match:
#16
Message:
#19136
Jul 28, 2004
From:
Steve Maher <lilabner_45(at)yahoo.com>
Subject:
Re: handheld and intercom
Some handhelds do, some don't.
I had a JRC JHP-520 handheld navcomm, and found that the owner's manual
stated in big black letters, DO NOT GROUND THE PTT LINE TO TRANSMIT. In
that radio, it says you have to connect the PTT line to another line on
the plug, to transmit.
I now have a Vertex (formerly Yaesu) VXA-210 handheld navcomm. Its
manual doesn't say much about what to do with the PTT line, so I called
their service department and talked to one of their techs who seemed
quite knowledgeable. He checked the schematics and told me that
grounding the PTT line to transmit, is definitely the correct way to
go.
Whatever radio you're contemplating, if I were you I'd call the company
first and ask them about the PTT line. Personally I like the ground-it
types, since they conform to what most intercoms do.
Steve Maher
San Diego, CA
--- On Sat, 3/27/10, Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com
> wrote:
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Jhp 520 PTT cable
s.bob@aeroelectric.com>
At 09:43 AM 3/27/2010, you wrote:
> Does anyone know where I could get a remote PTT switch that works properl
y for this unit? I read in the archives that it does not take a PTT that gr
ounds to talk.
>
> I am uncertain about the note to "connect the PTT line to one of the othe
r lines".
- Where do you see this 'note'?
Bob . . .
Do not archive=0A=0A=0A
Message 7
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Subject: | Re: On the subject of checking voltage..... |
OK, today there just is no excuse for one not having a working DVM
(digital volt meter) that you can trust. Sears have several models,
they work well. can be ordered on-line. Watch for one of their tool
sales, they usually have one of the models marked down to about half
price, that $10-$15 bucks. Now you will also need a good battery for
it. They have some with auto shut off and also have one with a
tempature probe.
Harbor Frieght also has their cheap DVM as low as $3 at times - how
accurate I don't know but it's probably more than close enought for
what were working with, note uses more batteries, does not have auto shut off.
I guess you all can figure out how I know that.
jerb
Message 8
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Subject: | Re: Source for Schumacher 1562A |
I noticed that the picture on the walmart site linked below shows the "new"
style without the 6v-12v switch. Did anyone ever resolve whether the
problem that started this discussion was an isolated anomaly or a universal
feature of the new version of the charger?
On Thu, Mar 25, 2010 at 3:59 PM, <RGent1224@aol.com> wrote:
> Is this what you're looking for??
>
>
> http://www.walmart.com/catalog/product.do?product_id=13005742&findingMethod=rr
>
> Dick
>
> In a message dated 3/25/2010 2:51:04 P.M. Central Daylight Time,
> nuckolls.bob@aeroelectric.com writes:
>
> nuckolls.bob@aeroelectric.com>
>
> At 10:36 AM 3/25/2010, you wrote:
> >
> >
> >Where are you guys finding the Shumacher 1562 battery chargers? I
> >looked at WalMart and they carry Shumacher battery chargers, but none
> >of them are labled 1562.
>
> I don't ALWAYS see them on the shelf at my various
> visits to Walmart but they're available more often
> than not.
>
> Bob . . ========================= Use utilities Day
> ================================================ - MATRONICS
> WEB FORUMS ================================================ -
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