Today's Message Index:
----------------------
1. 05:01 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (Brian Lloyd)
2. 05:57 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (John Slade)
3. 06:00 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (John Slade)
4. 06:24 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (SportAV8R@aol.com)
5. 07:05 AM - Digital Music in the Cockpit (F1Rocket@comcast.net)
6. 07:23 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (Brian Lloyd)
7. 07:27 AM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (John Slade)
8. 07:50 AM - Re: Digital Music in the Cockpit (Brian Lloyd)
9. 07:50 AM - Re: Digital Music in the Cockpit (Larry Bowen)
10. 07:59 AM - Re: Digital Music in the Cockpit (Ron Koyich)
11. 08:06 AM - Re: Digital Music in the Cockpit (Chad Robinson)
12. 08:09 AM - Re: Digital Music in the Cockpit (Ralph E. Capen)
13. 08:24 AM - Re: Digital Music in the Cockpit (John Slade)
14. 08:39 AM - Runaway trim switch (McFarland, Randy)
15. 08:53 AM - Shielded cable question (McFarland, Randy)
16. 09:23 AM - Re: Digital Music in the Cockpit (Brian Lloyd)
17. 09:23 AM - Re: Digital Music in the Cockpit (Brian Lloyd)
18. 10:29 AM - Re: Comm receiver overload (William Yamokoski)
19. 12:07 PM - Re: Digital Music in the Cockpit (Dan Checkoway)
20. 12:11 PM - Re: Digital Music in the Cockpit (Dan Checkoway)
21. 12:28 PM - Re: Digital Music in the Cockpit (Matt Prather)
22. 01:11 PM - Re: Digital Music in the Cockpit (echristley@nc.rr.com)
23. 02:38 PM - Re: Digital Music in the Cockpit (Matt Prather)
24. 03:35 PM - Re: Digital Music in the Cockpit (Brian Kraut)
25. 05:05 PM - Power diode drops (Paul Messinger)
26. 06:28 PM - Re: ICOM A200 and Flightcom 403 - Transmit Problems? (Charlie England)
27. 06:38 PM - Re: Power Diode Drops (Eric M. Jones)
28. 07:32 PM - Re: Comm receiver overload (Brian Lloyd)
29. 08:01 PM - Re: Re: Power Diode Drops (Brian Lloyd)
30. 08:01 PM - Re: Digital Music in the Cockpit (Brian Lloyd)
31. 08:32 PM - B&C LR-3C question (James Redmon)
32. 08:33 PM - Re: Re: Power Diode Drops (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
John Wiegenstein wrote:
> functions, etc., and I can receive comm transmissions just fine. Problem
> is I don't seem to be able to transmit. When I use the PTT switch the ICOM
> shows "TX" on the display, but I don't hear myself in the headphones when I
> talk, and cannot get a response from tower.
The fact you see the TX indicates that the PTT circuit is functioning. To hear
yourself you need to adjust the sidetone level in the radio and adjust the mic
level. You are probably just sending a carrier with no modulation.
> I tried placing multimeter
> leads across the antenna terminal (its a generic belly mount bent whip) and
> to ground, and when the PTT is pressed and "TX" shows on the ICOM, I show a
> jump to about 1.5V across the antenna.
DO NOT DO THAT! You cannot check transmitter power output with a multimeter.
In fact, you can damage your transmitter and multimeter doing that. I suspect
that the Icom has a high-VSWR protection circuit and will save itself but that
is not true for all radios.
Here is how I would troubleshoot the problem:
1. Disconnect the coax at the antenna and attach it to a dummy-load/wattmeter.
The wattmeter will show the transmit power output and the dummy load will absorb
the power so that you don't radiate and cause interference.
2. Tune your transmitter to another frequency, one that is not used locally.
DO NOT tune up on the tower or ground control frequencies.
3. Key the tranmitter. The wattmeter should indicate something on the order of
5-10 watts.
4. Use another radio (handheld) to tune in the same frequency as your transmitter.
Now you should be able to hear your signal.
5. As you key your transmitter you will open the squelch on the other radio.
When you talk you should be able to hear yourself on the other radio. If not,
increase the mic gain on your transmitter. Do NOT turn it up too much. You
want to turn it up just enough so that your signal sounds clean and clear, just
about as loud as the tower sounds in the other radio. Use the lowest mic gain
setting that produces acceptable results.
6. After you set the mic gain set the sidetone level so that your own speech in
your headphones is about the same volume as the tower when they talk to you.
If you can lay hands on a service monitor (a very expensive piece of test gear
usually made by a company named IFR) you speed the process. The service monitor
has the wattmeter and dummy load built in as well as a receiver to let you
monitor your transmitter directly. In that case set the service monitor to the
AM mode, tune in your transmitter's frequency, and adjust your transmitter's
mic gain to provide about 90% modulation on peaks. Most new radios have protection
against overmodulation and will not let you get above about 90% modulation
but it pays to be careful.
Most people have the tendency to set the mic gain too high. It should be set just
high enough to make your signal sound as loud as the tower.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 2
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| Subject: | ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
>Here is how I would troubleshoot the problem......
Brian,
I just wanted you to know that I happen to have the exact same radio
(different intercom), and the exact same problem. I was planning to try and
fix it today and didn't know where to start.
Talk about timely information!
Thanks.
John Slade
Turbo Rotary Cozy IV
http://canardaviation.com/cozy
Message 3
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| Subject: | ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
While I have you're learned ear....
My transponder recently came back from Narco where it was fixed, tested and
upgraded.
The Tower isn't getting a transponder signal. There IS power to the
transponder. Is there anything I can check before calling in the $75/hr guy?
John Slade
Message 4
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| Subject: | Re: ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: SportAV8R@aol.com
In a message dated 6/3/2004 9:00:14 AM Eastern Daylight Time, sladerj@bellsouth.net
writes:
> While I have you're learned ear....
>
> My transponder recently came back from Narco where it was fixed, tested and
> upgraded.
> The Tower isn't getting a transponder signal. There IS power to the
> transponder. Is there anything I can check before calling
> in the $75/hr guy?
>
> John Slade
>
>
> _-
Antenna connections!
I paid $250 to Garmin for a bench check of an inop txponder just out of warranty,
only to be told it was 100% operational. Turns out the center conductor had
pulled out of a connector in the antenna feedline run to the wheel pant, where
I had "hidden" the antenna. 100% my fault, for not providing enough slack in
the line to allow for movement, but a very expensive lesson!
My belly-mounted xpdr antenna will often get enough oil/grime on it to make it
unusable. Wiping it off restores normal operation.
-Bill B
Message 5
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| Subject: | Digital Music in the Cockpit |
--> AeroElectric-List message posted by: F1Rocket@comcast.net
I'm getting ready to purchase and install my intercom and a source for digital
music. I'm interested in what others are using as a MP3 player and what, if any,
problems you encountered connecting this device up to your intercom.
I am using a PM-3000 stereo intercom. It comes with a music jack. I assume that
I plug the headphone output from the MP3 player into this jack. Is that correct?
I'm not sure if the MP3 players have a music out jack.
Your experiences, pro's, con's, etc appreciated.
Randy
F1 Rocket
Message 6
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| Subject: | Re: ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
John Slade wrote:
> --> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
>
>>Here is how I would troubleshoot the problem......
>
>
> Brian,
> I just wanted you to know that I happen to have the exact same radio
> (different intercom), and the exact same problem. I was planning to try and
> fix it today and didn't know where to start.
> Talk about timely information!
I am very happy to hear that my information is useful. Thank you.
Good luck and I hope the procedure I outlined solves your problem.
As an aside, if you are looking for radio troubleshooting tools, check the ham
radio catalogs. Radio shack has a VSWR-meter/wattmeter available via the web
or special order in the stores. They also sell a dummy load. This is the kind
of thing that an EAA chapter should have because darned near every airplane
being built will have radios in it and these will need testing.
Here are the test setups:
.
| <-Antenna
|
[radio]---------[SWR-bridge]--'
[radio]----------[wattmeter]--[dummy-load]
Note that most SWR bridges are now wattmeters so you just need two devices, the
SWR-bridge/wattmeter and a dummy load.
Test with the dummy load first because that will verify that the proper operation
of the radio and the coax. Testing with the SWR-bridge connected to the antenna
tests the whole system. Remember, many radios have a protection circuit
that will shut down the transmitter if the coax and/or antenna are not working
properly. This can cause you to think that the radio is broken. The dummy
load looks to the radio like a perfect antenna and allows the radio to output
full power even if the antenna or antenna installation is faulty. If it works
into the dummy load but doesn't work into the antenna, you need to troubleshoot
the antenna, not the radio.
The SWR bridge will tell you if the radio, coax, and antenna are doing their jobs.
SWR should be less than about 2:1. If it is, the antenna is working properly.
One more thing: put a break in your coax under the panel where you can get at it.
This will let you test the radios independently of the antenna. Do something
like this:
.
| <-antenna
|
[radio]------=[] == []=-------'
/
coax | | \BNC male
| \
| BNC female/female barrel connector
\
BNC male connector
Do this for the antenna leads of all your comm and nav radios. This will allow
you to attach test equipment without having to tear your airplane apart. Be
sure to make the loop of coax from the radio to the first BNC connector long enough
that you can comfortably attach the test equipment where you can see or
or can attach another cable to it for testing.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 7
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| Subject: | ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
> Very frustrating to have these little bugs when its so close to
> being ready to fly :-((
Even more frustrating when it's already flying. :)
I monitor this list, but forgot to make a first flight announcement on it
for those who don't follow the canard forums, so in case anyone's
interested, belatedly:
I'm pleased to announce that Turbo Rotary Cozy IV, N96PM made it's first
flight on April 9th, 2004. A detailed write-up and pictures can be found at
http://canardaviation.com/cozy
My thanks to Bob and everyone on this list who helped me with the electrical
system.
The plane now has 3 hrs on it and I'm gradually working my way through the
bugs.
Regards,
John Slade
Turbo Rotary Cozy IV
http://canardaviation.com/cozy
Message 8
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
F1Rocket@comcast.net wrote:
> I am using a PM-3000 stereo intercom. It comes with a music jack. I
> assume that I plug the headphone output from the MP3 player into this
> jack. Is that correct? I'm not sure if the MP3 players have a music
> out jack.
I have stereo music inputs in all my airplanes. I have used portable cassette,
CD, and MD players by plugging them in as you have described. Plug the headphone
output from the player into the music input of the audio panel.
I now have an Apple iPod. This is the most fantastic device for playing music
in the cockpit I have ever found. My entire record and CD collection fits on
the thing with plenty of room left over for more music in the future. I don't
need to fumble around with cassettes, CDs, minidisks, or memory cards. Not only
that but the song you want is always right there. I highly recommend this
as the best solution for portable music in the cockpit.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 9
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| Subject: | Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Larry Bowen" <Larry@BowenAero.com>
Not really what you asked for, but I've nixed the MP3 idea, and will someday
go with an XM radio. I decided MP3 downloading/ripping/burning/etc was too
much hassle. Spontanious selection of news or talk or rock or classical is
much better, for me.
I've wired my plane for music in, but haven't commited to a source yet.
-
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
> -----Original Message-----
> From: F1Rocket@comcast.net [mailto:F1Rocket@comcast.net]
> Sent: Thursday, June 03, 2004 10:04 AM
> To: Aeroelectric List
> Subject: AeroElectric-List: Digital Music in the Cockpit
>
>
> --> AeroElectric-List message posted by: F1Rocket@comcast.net
>
> I'm getting ready to purchase and install my intercom and a
> source for digital music. I'm interested in what others are
> using as a MP3 player and what, if any, problems you
> encountered connecting this device up to your intercom.
>
> I am using a PM-3000 stereo intercom. It comes with a music
> jack. I assume that I plug the headphone output from the MP3
> player into this jack. Is that correct? I'm not sure if the
> MP3 players have a music out jack.
>
> Your experiences, pro's, con's, etc appreciated.
>
> Randy
> F1 Rocket
>
>
> ============
> Matronics Forums.
> ============
> ============
> http://www.matronics.com/FAQ/AeroElectric-List.htm
> ============
>
>
>
>
>
>
Message 10
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| Subject: | Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Ron Koyich" <Ron@Koyich.com>
I'm using a Nomad Jukebox, Randy. Upgraded the HD to 20GB and it holds
heaps of CDs.
>>I'm not sure if the MP3 players have a music out jack.<<
What am I missing? Music out is what they're all about. Some have only an
earphone jack, others have a line output, too, that's not influenced by
the unit's volume control.
The connections you suggest will work fine!
Ron
Message 11
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: Chad Robinson <crj@lucubration.com>
F1Rocket@comcast.net wrote:
> --> AeroElectric-List message posted by: F1Rocket@comcast.net
>
> I'm getting ready to purchase and install my intercom and a source for
> digital music. I'm interested in what others are using as a MP3 player and
> what, if any, problems you encountered connecting this device up to your
> intercom.
>
> I am using a PM-3000 stereo intercom. It comes with a music jack. I
> assume that I plug the headphone output from the MP3 player into this jack.
> Is that correct? I'm not sure if the MP3 players have a music out jack.
That's pretty much the story. All MP3 players have at least a headphone-out
jack and this would probably work provided you were careful with your volume
settings on the player. It would be better if the player had a line-out jack,
and choosing the right player would go a long way toward helping the quality
of the audio signal. On some players this is built in, on others (like the
iPod) you need to buy an adapter to obtain the line-out signal.
-Chad
Message 12
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Ralph E. Capen" <recapen@earthlink.net>
I have a PM stereo intercom with a Sony MP3 cd player wired to it. The cd player
has a 10sec skip prevention feature. Haven't flown yet - but I've tested the
beejeebers out of it and I'm very happy.
Zap me direct if you need more details.....
-----Original Message-----
From: F1Rocket@comcast.net
Subject: AeroElectric-List: Digital Music in the Cockpit
--> AeroElectric-List message posted by: F1Rocket@comcast.net
I'm getting ready to purchase and install my intercom and a source for digital
music. I'm interested in what others are using as a MP3 player and what, if any,
problems you encountered connecting this device up to your intercom.
I am using a PM-3000 stereo intercom. It comes with a music jack. I assume that
I plug the headphone output from the MP3 player into this jack. Is that correct?
I'm not sure if the MP3 players have a music out jack.
Your experiences, pro's, con's, etc appreciated.
Randy
F1 Rocket
Message 13
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| Subject: | Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
While we're on the subject, I have a portable CD player with the headphone
output hooked to the intercom. It works, but the volume is very low. Is
there a simple fix or some gizmo I can buy to match the input?
John Slade
Message 14
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| Subject: | Runaway trim switch |
--> AeroElectric-List message posted by: "McFarland, Randy" <Randy.McFarland@novellus.com>
I read recently on this list comments about the value of having/not having a
means to control/reverse a runaway trim. IF I were to add a switch in the
servo circuit that would cut the power to the offending relay or
Rocker/Stick switch that caused the problem, and provide power to the servo
to reverse the servo positon, how would I wire the Emergency Runaway Trim
Reversing Switch? (Hopefully you can interpret my description of the intent)
Thx
Randy
Message 15
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| Subject: | Shielded cable question |
--> AeroElectric-List message posted by: "McFarland, Randy" <Randy.McFarland@novellus.com>
Forgot to ask one other question:
Am I asking for noise problems if I run my Elevator Trim servo wires in the
same 17 conductor cable as the PTT wires from my Infinity Stick grip forward
to a terminal block on the panel where they get routed to their final
destinations? I could run the sheilded 5 conductor cable from the servo
uninterupted to the panel, but am trying to minimize the number of wires
running thru the few holes provide thru my 7A center section. Thoughts?
Thx
Randy
Message 16
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Chad Robinson wrote:
> of the audio signal. On some players this is built in, on others (like the
> iPod) you need to buy an adapter to obtain the line-out signal.
I have used both the line output and the headphone output. They work pretty much
the same. The PS engineering audio panel does not have a level control for
the music in so you probably want some sort of volume control for your music
source. This tends to favor the headphone out from your music source.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 17
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
John Slade wrote:
> --> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
>
> While we're on the subject, I have a portable CD player with the headphone
> output hooked to the intercom. It works, but the volume is very low. Is
> there a simple fix or some gizmo I can buy to match the input?
Bob Nuckols sells an amplifier kit that should solve your problem.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 18
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| Subject: | Re: Comm receiver overload |
--> AeroElectric-List message posted by: "William Yamokoski" <yamokosk@lakemichigancollege.edu>
Thanks Bob et al for the responses to my question. If it wasn't for the fact
that it's occasionally a tower or controller that reports garbeled transmission,
I sure wouldn't sweat it.
As to the antenna, it is mounted near vertically in the vert. stab. Also,
in my never-ending quest to solve this mystery (including buying a new radio)
I've had many occasions to plug my handheld into the ship's antenna and fly that
way for weeks at a time. I never got a report of garbeled response using
the handheld. Now, maybe it was just that nobody bothered to report a problem
back to me during those times.
Anyway, thanks for the help. Is there any point in fiddling with the length
of cable connecting antenna to radio? I know optimum lengths are recommended,
but could that be related to my problem?
Bill Yamokoski
Message 19
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Dan Checkoway" <dan@rvproject.com>
ipod! I have a 15gb ipod that rocks the house. When I wired my GMA-340
audio panel, I installed a 3.5mm stereo jack under the panel. I just plug
this puppy in and go. I have like 2800 songs on my ipod and it's not even
full (yet).
The sound quality is excellent (I utilized the 20db boost jumper on the
GMA-340).
Why pay a subscription fee every friggin' month for "usually what you like"
programming on satellite radio when you can have your entire music
collection in one tiny compact, battery free (it's rechargable), non
aircraft current consumer, no moving parts, no panel space taker, etc.,
etc.?
Why install a piece of hardware in your panel that you *know* will be
obsolete in 2-3 years?
I'm all for the ipod and the like.
)_( Dan
RV-7 N714D
http://www.rvproject.com
----- Original Message -----
From: <F1Rocket@comcast.net>
Subject: AeroElectric-List: Digital Music in the Cockpit
> --> AeroElectric-List message posted by: F1Rocket@comcast.net
>
> I'm getting ready to purchase and install my intercom and a source for
digital music. I'm interested in what others are using as a MP3 player and
what, if any, problems you encountered connecting this device up to your
intercom.
>
> I am using a PM-3000 stereo intercom. It comes with a music jack. I
assume that I plug the headphone output from the MP3 player into this jack.
Is that correct? I'm not sure if the MP3 players have a music out jack.
>
> Your experiences, pro's, con's, etc appreciated.
>
> Randy
> F1 Rocket
>
>
Message 20
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Dan Checkoway" <dan@rvproject.com>
Check your audio panel installation manual...I know of at least one audio
panel that has a built-in feature for this very reason. The GMA-340 has a
20db music boost (I've mentioned it numerous times because I find it so
useful). It's just a pin on one of the connectors that you pull to ground.
There are also variations on the "mute inhibit" functionality that you can
play with as well. Just check your manual, there may be "out of the box"
solutions built in.
do not archive
)_( Dan
----- Original Message -----
From: "Brian Lloyd" <brianl@lloyd.com>
Subject: Re: AeroElectric-List: Digital Music in the Cockpit
> --> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
> John Slade wrote:
>
> > --> AeroElectric-List message posted by: "John Slade"
<sladerj@bellsouth.net>
> >
> > While we're on the subject, I have a portable CD player with the
headphone
> > output hooked to the intercom. It works, but the volume is very low. Is
> > there a simple fix or some gizmo I can buy to match the input?
>
> Bob Nuckols sells an amplifier kit that should solve your problem.
>
> --
> Brian Lloyd 6501 Red Hook Plaza
> brianl@lloyd.com Suite 201
> http://www.lloyd.com St. Thomas, VI 00802
> +1.340.998.9447 (voice) +1.360.838.9669 (fax)
>
> There is a time to laud one's country and a time to protest.
> A good citizen is prepared to do either as the need arises.
>
>
Message 21
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
I like too many kinds of music to own everything. Plus, I get to hear lots
of new artists without hearing any ads. 10 bucks a month is only one cd
a month. I like my XM. Everybody is different.
Regards,
Matt-
N34RD
> --> AeroElectric-List message posted by: "Dan Checkoway"
> <dan@rvproject.com>
>
> ipod! I have a 15gb ipod that rocks the house. When I wired my GMA-340
> audio panel, I installed a 3.5mm stereo jack under the panel. I just
> plug this puppy in and go. I have like 2800 songs on my ipod and it's
> not even full (yet).
>
> The sound quality is excellent (I utilized the 20db boost jumper on the
> GMA-340).
>
> Why pay a subscription fee every friggin' month for "usually what you
> like" programming on satellite radio when you can have your entire music
> collection in one tiny compact, battery free (it's rechargable), non
> aircraft current consumer, no moving parts, no panel space taker, etc.,
> etc.?
>
> Why install a piece of hardware in your panel that you *know* will be
> obsolete in 2-3 years?
>
> I'm all for the ipod and the like.
>
> )_( Dan
> RV-7 N714D
> http://www.rvproject.com
>
> ----- Original Message -----
> From: <F1Rocket@comcast.net>
> To: "Aeroelectric List" <aeroelectric-list@matronics.com>
> Subject: AeroElectric-List: Digital Music in the Cockpit
>
>
>> --> AeroElectric-List message posted by: F1Rocket@comcast.net
>>
>> I'm getting ready to purchase and install my intercom and a source for
> digital music. I'm interested in what others are using as a MP3 player
> and what, if any, problems you encountered connecting this device up to
> your intercom.
>>
>> I am using a PM-3000 stereo intercom. It comes with a music jack. I
> assume that I plug the headphone output from the MP3 player into this
> jack. Is that correct? I'm not sure if the MP3 players have a music out
> jack.
>>
>> Your experiences, pro's, con's, etc appreciated.
>>
>> Randy
>> F1 Rocket
>>
>>
>
>
Message 22
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: echristley@nc.rr.com
> Why install a piece of hardware in your panel that
you *know* will be
> obsolete in 2-3 years?
>
> I'm all for the ipod and the like.
>
> )_( Dan
There's also the question of 'how often will I use
it?' Unless the airplane is for serious
transportation, I submit that the answer would be
'seldom'. I considered a flat panel display on the
back of the pilot's seat for the benefit of the
three in the back. Looked at prices, how often it
would be used, and decided that the flat panel would
make more sense in a laptop that could be taken on
that rare long trip with the family.
Will you actually turn on an XM radio when you're
puddle-jumping to the $100 hamburger in a loose
formation of your buddies?
Message 23
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
I use my XM at home far more than anywhere else.... But
I agree with the philosophy you are suggesting. I wouldn't
buy an XM to permanently mount in the plane.
MAP
>
> There's also the question of 'how often will I use
> it?' Unless the airplane is for serious
> transportation, I submit that the answer would be
> 'seldom'. I considered a flat panel display on the
> back of the pilot's seat for the benefit of the
> three in the back. Looked at prices, how often it
> would be used, and decided that the flat panel would
> make more sense in a laptop that could be taken on
> that rare long trip with the family.
>
> Will you actually turn on an XM radio when you're
> puddle-jumping to the $100 hamburger in a loose
> formation of your buddies?
Message 24
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| Subject: | Digital Music in the Cockpit |
--> AeroElectric-List message posted by: "Brian Kraut" <brian.kraut@engalt.com>
I used an XM satelite radio in my KR-2. It was great. You can get satelite
weather services on it now also.
Brian Kraut
Engineering Alternatives, Inc.
www.engalt.com
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of
F1Rocket@comcast.net
Subject: AeroElectric-List: Digital Music in the Cockpit
--> AeroElectric-List message posted by: F1Rocket@comcast.net
I'm getting ready to purchase and install my intercom and a source for
digital music. I'm interested in what others are using as a MP3 player and
what, if any, problems you encountered connecting this device up to your
intercom.
I am using a PM-3000 stereo intercom. It comes with a music jack. I assume
that I plug the headphone output from the MP3 player into this jack. Is
that correct? I'm not sure if the MP3 players have a music out jack.
Your experiences, pro's, con's, etc appreciated.
Randy
F1 Rocket
Message 25
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| Subject: | Power diode drops |
--> AeroElectric-List message posted by: "Paul Messinger" <paulm@olypen.com>
Just ran some real tests. (Power supply in constant current mode. (TEK PS
2511 Programmable Power Supply), 'In calibration' for the curious :-)
A "typical" Diode bridge (25A rated) V drop at 7 amps is 0.81V (0.76V at 2
amps) and a Schottky power diode is 0.31V (0.25V at 2 amps), Both at room
temp.
The extra 0.5V (usable) you get (with Schottky) can be a lot of extra
battery life.
Look at the minimum voltages required for some avionics and then look at the
Amp hours available in a battery with a 0.5V lower end of useful life
voltage. 0.5 volts can be a significant increase in useful life, when you
must run on battery power alone.
I am using a 160CMQ045 that is insulated from the case and has 3/16" (#10)
boltable lugs. So while not inexpensive (just under $30 in ones), its very
easy to mount and wire. Use www.findchips.com to locate stock.
(Currently in stock at Digikey.)
Useful for both "avionics bus" etc and also for charging a backup battery
where the V drop of "normal" bridge diodes would prevent a full charge (not
to mention the heat sink required during a high current chargeing period.
The secret to low V drop with Schottky diodes, besides the technology, is a
large die size IE high current rating. The above part is two diodes
internally connected as a full wave rectifier rated at 160 amps each. Thus
its very close to a drop in replacement for the diode bridge Electrically
direct replacement and mechanically "no insulation" bolt down mounting.
Plus nearly 2/3 fewer watts lost in heat you must sink.
There are lots of other Schottky diodes available but few with as simple
mechanical and electrical mounting.
Paul
Message 26
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| Subject: | Re: ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: Charlie England <ceengland@bellsouth.net>
John Slade wrote:
>--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
>
>While I have you're learned ear....
>
>My transponder recently came back from Narco where it was fixed, tested and
>upgraded.
>The Tower isn't getting a transponder signal. There IS power to the
>transponder. Is there anything I can check before calling in the $75/hr guy?
>
>John Slade
>
Generic troubleshooting stuff follows. All except the interrogation
light would apply to comms as well as xp's.
Does the interrogation light flash periodically, indicating that the
xponder is hearing the radar? If not, look for antenna/coax/connector
issues.
If it does flash, see above. ;-)
Seriously, have you made sure that the xp is *fully* seated in the
tray, *and* that the lock/retaining screw is completely tightened?
Sometimes you must insert the radio in the tray, tighten the screw, push
on the radio & discover that it will go in a little more, then discover
that the screw isn't tight any more, so you tighten it again. If it's
not fully seated, the coax connector might not be making contact with
its mate in the tray. You might be able to receive but not transmit
(both needed in a transponder). This can apply to a regular comm also.
The same problem can be caused by the tray being mounted slightly too
far back (forward?) behind the instrument panel.
Have you checked the ant. cable to be sure that the center conductor
isn't shorted to the shield? It's not hard at all to have a strand of
the shield get folded over & touch the center conductor. You can check
for shorts with a regular ohm meter by probing center & shield after you
disconnect the coax from the back of the tray. Even with the antenna
connected you should see near infinite (very high) resistance when
measuring between center conductor & shield.
Do working xp's in other a/c at your airport flash their interrogation
lights while on the ground showing that they can hear the radar while on
the ground? If so, try this:
After trying all the above, as a last resort you might make or borrow
another 3'-6' length of coax & another antenna. Just hook the spare coax
to the tray & prop the spare antenna vertically somewhere in the cockpit
where it can see the radar at the airport. (I'm assuming that the radar
is somewhere close.) You can call the tower or Approach & get a squawk
code, then ask them if they see your reply using the substituted
coax/antenna.
Last & very long shot: Is there a chance that the xp has an 'enable' pin
that would be used to control the xp with remote switches? If it does,
the manual might be deceptive or vague about the need to strap that pin
to ??? if you don't use the remote switch.
Charlie
(Thanks for helping blaze new trails with the rotary. I'm hoping to
follow down that path when my RV-7 is ready for a motor.)
Message 27
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| Subject: | Re: Power Diode Drops |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
My numbers are similar to Paul's, for the 276-1185 diode bridge I got from
Radio Shack versus the IR 100BGQ-030 Schottky, the numbers are:
Load Radio Shack Schottky
5A 0.86 Vf 0.32 Vf
10A 0.89 0.34
11A 0.91 0.35
16A 0.94 0.35
At any point the Schottky ran far cooler than the RS diode.
The energy left in the battery is extremely important. One of the techniques
that is now being used in battery operated devices is to use circuitry that
jacks up the output voltage to whatever you want while it sucks the
batteries flat. Example---a single 1.5 Volt cell drives circuitry that
produces 9V in a transistor- battery-sized package with flat discharge until
dead. MUCH greater capacity, MUCH lower cost. Cool....
So the Schottky can use much more of the energy contained in the battery.
That energy is sitting there at a great penalty in weight if you don't use
it. Someone should figure this out--it's probably a pound or more.
This is not a case of what Brian calls "angels dancing on the head of a
pin". This is not a subtle difference at all.
I've spent the last couple days putting my website back up. My old ISP
apparently left town under a cloud.
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
Message 28
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| Subject: | Re: Comm receiver overload |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
William Yamokoski wrote:
> radio) I've had many occasions to plug my handheld into the ship's
> antenna and fly that way for weeks at a time. I never got a report of
> garbeled response using the handheld. Now, maybe it was just that
> nobody bothered to report a problem back to me during those times.
> Anyway, thanks for the help. Is there any point in fiddling with the
> length of cable connecting antenna to radio? I know optimum lengths
> are recommended, but could that be related to my problem
The length of coax is not an issue. If changing the length of the coax improves
things there is something wrong with the antenna installation and you should
deal with the problem there.
When I have problems with transmit audio it is often RF getting into the mic input.
Does the problem change when you change the radio frequency? Does the problem
change when you switch microphones or headsets? These indicate that RF
is getting back into mic circuit.
Here are some possible fixes:
1. Add small bypass capacitors to the mic lines at the jacks and at the transceiver.
2. Add ferrite beads to the PTT, mic audio, and ground lines both at the jack
and at the transceiver.
3. Adjust the mic gain at the transceiver and at the microphone to see if there
is a combination that does away with the problem.
The ARRL has information on getting rid of RF interference in radios. You might
check out the Radio Amateur's Handbook for information. It also has good information
about antennas, coax, connectors, and getting the most out of a mobile
radio installation. This stuff is just as applicable to aircraft as it is
to cars.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 29
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| Subject: | Re: Power Diode Drops |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Eric M. Jones wrote:
> --> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
>
> My numbers are similar to Paul's, for the 276-1185 diode bridge I got from
> Radio Shack versus the IR 100BGQ-030 Schottky, the numbers are:
>
> Load Radio Shack Schottky
> 5A 0.86 Vf 0.32 Vf
> 10A 0.89 0.34
> 11A 0.91 0.35
> 16A 0.94 0.35
>
> At any point the Schottky ran far cooler than the RS diode.
>
> The energy left in the battery is extremely important. One of the techniques
> that is now being used in battery operated devices is to use circuitry that
> jacks up the output voltage to whatever you want while it sucks the
> batteries flat. Example---a single 1.5 Volt cell drives circuitry that
> produces 9V in a transistor- battery-sized package with flat discharge until
> dead. MUCH greater capacity, MUCH lower cost. Cool....
I used one to build a 28V inverter to power a 28V attitude gyro from the 14V electrical
system in my RV-4. Worked like a champ and it wasn't much bigger than
a postage stamp.
> So the Schottky can use much more of the energy contained in the battery.
> That energy is sitting there at a great penalty in weight if you don't use
> it. Someone should figure this out--it's probably a pound or more.
>
> This is not a case of what Brian calls "angels dancing on the head of a
> pin". This is not a subtle difference at all.
In all but a very few cases the extra drop won't be an issue. If you are running
on battery power you are probably going to throw the switch that connects the
e-buss to the battery directly rather than through the blocking diode. Still,
I agree in principle and I use a Schottky diode in the electrical systems
I build because it is the best device for the job.
> I've spent the last couple days putting my website back up. My old ISP
> apparently left town under a cloud.
Sorry to hear that. Good luck!
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 30
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| Subject: | Re: Digital Music in the Cockpit |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Dan Checkoway wrote:
> ipod! I have a 15gb ipod that rocks the house. When I wired my GMA-340
> audio panel, I installed a 3.5mm stereo jack under the panel. I just plug
> this puppy in and go. I have like 2800 songs on my ipod and it's not even
> full (yet).
...
> Why install a piece of hardware in your panel that you *know* will be
> obsolete in 2-3 years?
>
> I'm all for the ipod and the like.
Rock on dude! I have the 20GB iPod with 2600 songs in it and it is not even half
full. I even grabbed my 24-year-old son's CDs and ripped them too. Seems
he and I have some similar tastes, especially when it comes to Reggae.
Heck, my mother, father, and I were coming back across country from my daughter's
college graduation in the Comanche last week when my dad says, "gee, do you
have any big-band swing in there?" I was able to say, "let's see ... Glen Miller,
Benny Goodman, Les Brown, a bunch of Sinatra, Asleep at the Wheel, Manhattan
Transfer, the New York Voices ... and I have a bunch of be-bop and cool.
What do you want to hear?"
Yeah, the iPod is pretty awesome.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 31
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| Subject: | B&C LR-3C question |
--> AeroElectric-List message posted by: "James Redmon" <james@berkut13.com>
All,
I was working with B&C on this, but the gentleman is out of pocket for a
couple weeks and thought one of you might know the answer.
I am using a LED instead of an incandescent lamp for the OV light. The
issue I discussed with B&C was that the LED never goes out...it stays on
(dimly) even when the regulator is turned off. When I turn on the regulator
(battery only) the LED does blink properly. He mentioned that the regulator
bleeds a little current on the lamp pin all the time - not enough to
illuminate a lamp, but a LED still glows slightly.
He mentioned a fix of placing a 520-ohm resistor between Pin 5 (the lamp
lead) and another pin on the regulator. I have misplaced my notes and can
not remember specifically which other pin to connect the resistor to.
Does someone happen to know which one I should use? If not, I can always
wait a
couple of weeks until Tim gets back.
Thanks!
James Redmon
Berkut #013 N97TX
http://www.berkut13.com
Message 32
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| Subject: | Re: Power Diode Drops |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:37 PM 6/3/2004 -0400, you wrote:
>--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
>
>My numbers are similar to Paul's, for the 276-1185 diode bridge I got from
>Radio Shack versus the IR 100BGQ-030 Schottky, the numbers are:
>
>Load Radio Shack Schottky
>5A 0.86 Vf 0.32 Vf
>10A 0.89 0.34
>11A 0.91 0.35
>16A 0.94 0.35
>
>At any point the Schottky ran far cooler than the RS diode.
>
>The energy left in the battery is extremely important. . .
This is a moot point. The battery is never used to supply normal
path current. The only time the diode is in service is while the alternator
is running and main bus voltage is 13.8 to 14.6 volts. People keep
tossing around these gawd-awful power dissipations as significant
to battery-only endurance when the diode carries no current during
alternator-out operations. Further, anyone running an e-bus load of
more than 5 amps continuous through ANY diode may be running the wrong
architecture.
> One of the techniques
>that is now being used in battery operated devices is to use circuitry that
>jacks up the output voltage to whatever you want while it sucks the
>batteries flat. Example---a single 1.5 Volt cell drives circuitry that
>produces 9V in a transistor- battery-sized package with flat discharge until
>dead. MUCH greater capacity, MUCH lower cost. Cool....
. . . completely inapplicable in this instance. Battery only ops tie
all e-bus equipment directly to the battery. E-bus loads should provide
useful operation down to 10.5 volts (battery capacity less than 5%). Jacking
up the parts count to squeeze that last 5% out of the battery is an
confession to having undersized the battery and/or subjecting it
to poor preventative maintenance.
>So the Schottky can use much more of the energy contained in the battery.
>That energy is sitting there at a great penalty in weight if you don't use
>it. Someone should figure this out--it's probably a pound or more.
>
>This is not a case of what Brian calls "angels dancing on the head of a
>pin". This is not a subtle difference at all.
Diode drop and wattage could be important if folks choose
to use it in a manner for which it was never suggested or intended.
Bob . . .
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