Today's Message Index:
----------------------
1. 12:37 AM - Re: Re: KX-125 Installation Manual? (Werner Schneider)
2. 10:59 AM - Stereo to Mono (Don McIntosh)
3. 11:34 AM - Re: Stereo to Mono (Robert L. Nuckolls, III)
4. 03:09 PM - Re: Stereo to Mono (Don McIntosh)
5. 03:56 PM - Re: Re: Stereo to Mono (Robert L. Nuckolls, III)
6. 04:25 PM - Re: Stereo to Mono (Ray)
7. 05:26 PM - Under-Glareshield GPS/WAAS Antenna ()
8. 08:19 PM - Re: Stereo to Mono (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: KX-125 Installation Manual? |
done
iconoclast wrote:
>
> If it's not too much trouble, can you please PM me the KX 125 manual also? I'm
adding a second com and need to patch into the harness for my 125.
>
> Thanks,
>
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=245836#245836
>
>
>
Message 2
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I want to install a plug in my panel to plug my stereo Walkman into but my intercom
(PM1000 II) is mono. Can I just splice the Right and Left leads together
to go into the intercom? Also the intercom pins are labeled "HI" and "LOW". Is
this just the pin identification numbers?
--------
Don McIntosh
Kitfox Series 7 under construction
Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=245926#245926
Message 3
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| Subject: | Re: Stereo to Mono |
At 12:58 PM 5/29/2009, you wrote:
><don@contractorsnorthwest.com>
>
>I want to install a plug in my panel to plug my stereo Walkman into
>but my intercom (PM1000 II) is mono. Can I just splice the Right and
>Left leads together to go into the intercom? Also the intercom pins
>are labeled "HI" and "LOW". Is this just the pin identification numbers?
Put a 100 ohm, 1/4w resistor in series with the two
stereo output before bringing them together at the
"HI" input terminal. The "LOW" terminal is ground.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
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| Subject: | Re: Stereo to Mono |
Bob,
Thanks for the answer. OK, so behind the panel, where do you mount these resistors,
or are they just soldered in-line with heat shrink over them?BTW I am in
process of reading your book.
--------
Don McIntosh
Kitfox Series 7 under construction
Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=245963#245963
Message 5
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| Subject: | Re: Stereo to Mono |
At 05:08 PM 5/29/2009, you wrote:
><don@contractorsnorthwest.com>
>
>Bob,
>Thanks for the answer. OK, so behind the panel, where do you mount
>these resistors, or are they just soldered in-line with heat shrink over them?
Given the relatively low priority for
comfortable terminaion of flight, I think
I'd build them into the wire bundle and
heat shrink 'em. See:
http://aeroelectric.com/articles/Homeless/Homeless_Components.htm
>BTW I am in process of reading your book.
Great! If you have any questions, post them
here on the List.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
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| Subject: | Re: Stereo to Mono |
Bob,
Just a quick question. It the resistor to lower the voltage at the
intercom or is it related to what the CD player output sees? Or
something completely different. If it is to lower the voltage, should
the voltage be in the same range as the other inputs to the intercom?
Thanks,
Raymond Julian
Kettle River, MN.
"Hope for the best, but plan for the worst"
do not archive
Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 12:58 PM 5/29/2009, you wrote:
>> <don@contractorsnorthwest.com>
>>
>> I want to install a plug in my panel to plug my stereo Walkman into
>> but my intercom (PM1000 II) is mono. Can I just splice the Right and
>> Left leads together to go into the intercom? Also the intercom pins
>> are labeled "HI" and "LOW". Is this just the pin identification numbers?
>
> Put a 100 ohm, 1/4w resistor in series with the two
> stereo output before bringing them together at the
> "HI" input terminal. The "LOW" terminal is ground.
>
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
>
>
>
>
>
Message 7
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| Subject: | Under-Glareshield GPS/WAAS Antenna |
5/29/2009
Hello Fellow Listers, A while back there was a thread initiated by a
question on where to best mount a GPS WAAS antenna.
Below is a copy of an FAA SPECIAL AIRWORTHINESS INFORMATION BULLETIN that
relates to tlhis subject. A couple of comments:
1) 3MT Dual LockT is 3M's version of a Velcro like product.
http://www.andybaird.com/travels/gertie/superlock.htm
2) My GNS 430W antenna mounted on an aluminum shelf under the fiberglass
fuselage shell forward of the windshield on my KIS TR-1 has given excellent
service. The antenna is mounted with machine screws.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
==========================================================
1
FAA
Aircraft Certification Service
SPECIAL AIRWORTHINESS
INFORMATION BULLETIN
SUBJ: Navigation: Cirrus Aircraft Under-Glareshield GPS/WAAS Antenna SAIB:
CE-09-32
Mount Date: May 29, 2009
This is information only. Recommendations aren't mandatory.
Introduction
This Special Airworthiness Information Bulletin is being issued to alert
owners and installers to an
airworthiness concern regarding under-glareshield mounted antennas that may
cause loss of Global
Positioning System/Wide-Area Augmentation System (GPS/WAAS) navigation
service on Cirrus
Design Corporation (Cirrus) Models SR20 and SR22 airplanes. This Special
Airworthiness
Information Bulletin applies to all Cirrus aircraft with GPS/WAAS antennas
installed using the
original under-glareshield mounting location when replacing the non-WAAS GPS
antenna.
The airworthiness concern is not an unsafe condition that would warrant
airworthiness directive (AD)
action under Title 14 of the Code of Federal Regulations (14 CFR) Part 39.
Background
Cirrus originally incorporated an internal mounting location under the
aircraft glareshield for non-
WAAS GPS antennas on the Models SR20 and SR22 airplanes as part of the
aircraft type design.
These antennas were secured using the 3MT Dual LockT Reclosable Fastener
SJ3552 (Type 170)
engaged to 3MT Dual LockT Reclosable Fastener SJ3551 (Type 400). This method
to secure the
antennas was evaluated during the type certification process and found
satisfactory.
To upgrade the non-WAAS GPS equipment to GPS/WAAS capability requires new
antennas that
may be installed in the same location using the same fastener method as the
non-WAAS antennas.
There are two potential issues for GPS/WAAS service associated with the
under-glareshield
mounting location and fastener method: 1) robustness of the antenna mounting
method; and 2)
Localizer Performance with Vertical Guidance (LPV) service interruption due
to signal loss from
airframe shadowing. Both issues affect service availability and may
ultimately result in loss of
GPS/WAAS navigation capability. Loss of GPS/WAAS navigation capability
requires the operator to
rely on other on-board navigation equipment that may not have area
navigation or LPV capability.
Antenna Mounting Robustness
Two service difficulty reports (S8Y2008F00000 and 2007FA0000554) indicate
the possibility for
antennas secured using the 3MT Dual LockT fastener system to detach, which
would result in loss
of navigation. A detached antenna will not have an adequate field of view to
receive satellite signals
resulting in loss of GPS/WAAS navigation.
Airframe Shadowing
Cirrus airplanes use composite construction, which, unlike metal aircraft,
is essentially transparent to
radio signals. There is always concern that metal components such as
engines, instrument panels, or
embedded metal mesh for lightening protection can affect GPS/WAAS signal
reception for internally
mounted antennas. Antenna location, even on composite aircraft, can have an
affect on GPS/WAAS
2
signal availability due to signal shadowing and/or attenuation effects.
Shadowing and attenuation are
more critical during LPV operations due to the more stringent requirements
receivers must meet.
The current receiver and antenna performance standards use a conservative
estimate for intra-system
noise environment and antenna gain patterns that provides significant signal
margin. However, the
margin available today will gradually decrease as new systems, signals, and
satellites come on-line
over the next decade. This decrease could potentially cause decreased LPV
availability or loss of
GPS/WAAS navigation on Cirrus aircraft with antennas mounted under the
glareshield.
Recommendations
We recommend that owners and operators of Cirrus Models SR20 and SR22
airplanes using the
under-glareshield location for GPS/WAAS antennas relocate the antennas to
upper fuselage external
locations following Cirrus Optional Service Bulletins SB 2X-34-23 R1 (for
aircraft without a primary
flight display) or SB 2X-34-24 R1 (for aircraft with a primary flight
display). Relocating the
antennas according to the Optional Service Bulletins provides a more robust
antenna mounting; and
assures maximum GPS/WAAS signal reception for optimum service availability
when performing
LPV instrument approaches.
To obtain copies of Cirrus Optional Service Bulletins SB 2X-34-23 R1 or SB
2X-34-24 R1, contact
Cirrus Design Corporation, 4515 Taylor Circle Duluth, MN 5581-1548 or visit
their website at
www.cirruslink.com/mycirrus/servicepubs.aspx.
For Further Information Contact
Kevin J. Bridges, General Engineer, AIR-130; phone: (202) 385-4627; fax:
(202) 385-4651; e-mail:
kevin.bridges@faa.gov.
Message 8
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| Subject: | Re: Stereo to Mono |
At 06:24 PM 5/29/2009, you wrote:
>
>Bob,
>
> Just a quick question. It the resistor to lower the
> voltage at the intercom or is it related to what the CD player
> output sees? Or something completely different. If it is to lower
> the voltage, should the voltage be in the same range as the other
> inputs to the intercom?
The resistors are a crude "audio mixer" that
gives you a mono-average of right and
left channels. It also isolates the right
and left audio amplifiers from each other so
that diverse audio signal levels in the
two channels don't cause the two amplifiers
to arm-wrestle.
The resistors can be lower . . . say the
same as for MP3 player headphones . . .
33 ohms. But you probably won't hear much
loss of signal that cannot be compensated
for by turning up the volume on the audio
device.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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