Today's Message Index:
----------------------
1. 07:03 AM - Re: Yippee! ()
2. 07:09 AM - Re: Com and Nav Radio and Antenna Questions (Robert L. Nuckolls, III)
3. 09:33 AM - Re: Speaking of EMC filters (Dave Saylor)
4. 12:07 PM - Re: Speaking of EMC filters (Robert L. Nuckolls, III)
5. 12:07 PM - Re: Yippee! (Robert L. Nuckolls, III)
6. 12:51 PM - Re: Yippee! (Martymason)
7. 02:07 PM - Re: Re: Yippee! (earl_schroeder@juno.com)
8. 02:26 PM - Re: Servo problem (jonlaury)
9. 03:01 PM - Re: Re: Servo problem (Robert L. Nuckolls, III)
Message 1
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And did you intend to actually send a real link for us to enjoy?
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of joe motis
Sent: Wednesday, February 22, 2012 11:39 PM
Subject: Re: AeroElectric-List: Yippee!
"Yippee" The five thousandth Lockheed P 38 built and painted in a stunning vermillion
orange. Nothing Canadian about it Built right here in sunny SoCal.
On Wed, Feb 22, 2012 at 7:39 PM, Marty Mason <captainmarty@bellsouth.net>wrote:
> captainmarty@bellsouth.net>
>
>
> I hope u like it http://www.markspeterson.com/message.php?Diane This
> really works!
>
>
Message 2
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| Subject: | Com and Nav Radio and Antenna Questions |
>Once you have an MFJ259 in hand, you can both
>trim overall length of the Archer design to
>desired center frequency,
Shorter for higher center freq? If I need longer can I just rivet on an
extension?
Yes. But before you start tweaking the antenna,
Do a plot of SWR vs frequency over your range
of interest (108-118 MHz). If it's under 3:1
everywhere, the $time$ you spend on making
it better will probably not produce observable
increase in performance.
>you could also adjust
>the gamma-match and tuning capacitor for optimum
>performance too.
Is this done by just increasing or decreasing the plate size where the
center conductor attaches? Is this checked with the
Percent match function on the MFJ259B?
Yes. When I build this kind of antenna from
scratch, there are THREE adjustments. Over-all
LENGTH sets the center frequency. POSITION
of the gamma-match tap on the antenna sets
the impedance and VALUE of the capacitor
cancels the reactance of the gamma match
strut.
Bob no doubt did some experiments to finalize
these adjustments into a cookie-cutter antenna
without adjustments.
Degradation of performance due to proximity of
two antennas is not fully explored with an antenna
analyzer. The analyzer can only optimize the
antennas ability to accept energy from or deliver
energy to the feedline. You can hang a 50 ohm
resistor on the end of that feedline and produce
the appearance of a 'perfect' antenna while a
resistor has no useful qualities as an antenna.
A 'real' antenna will couple your feedline to the
'ether' but there are other variables that include
radiation patterns and radiation resistance that
probably have a more profound effect on performance
than just the SWR measurement.
It's REALLY hard to do comparative antenna work
on an airplane without a test range. Flying circles
in the sky while listening/talking to another facility
is useful but anecdotal . . . you can't plot comparative
data for two installations based on what you hear.
The bright star on the horizon is just that . . .
you're not going to talk to anyone over the horizon
no matter how good the antenna is. The energy
propagation needed to talk 150 miles is exceedingly
small . . . this means that an antenna can be a
very poor performer in terms of the best we know how
to do and still adequate to the task on our airplane.
This is more of an opportunity to broaden your own
been-there-done-that horizon than to fine-tune your
ship's proposed combination of antennas.
Bob . . .
Message 3
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| Subject: | Re: Speaking of EMC filters |
> In the mean time, can you hear the noise from a
> hand held in the cockpit? Tune to open channel
> and open the squelch. Turn the lamp on/off and
> see if you can hear any change in the receiver's
> normal background noise. Wearing headphones will
> help.
I can't hear the noise in the cockpit. I hear a very faint static
related to the lamps but not the objectionable loud noise I hear in
(the Archer antenna-ed) comm 2.
The slight noise seems constant until I move from the cockpit to
within about six feet of the lamp. Then it seems to increase a bit
with proximity but even close to the antenna it's not very loud.
However, if I put the handheld within a foot of the lamp, it breaks
squelch and makes the loud noise I'm trying to limit. With the
wig-wag on, the noise correlates perfectly to the lamp. It's
interesting, you can almost visualize the shape of the objectionable
area. The Archer antenna is within this noisy volume but it's size
requires the proximity.
If I leave the antenna in the wingtip, it has to be close to the lamp.
With some effort I could move the antenna. What are my options for
blocking the emissions? If I succeeded could I expect any remaining
antenna performance?
On a side note, the right lamp worked intermittently on the last
flight. Now it seems completely dead.
Dave Saylor
AirCrafters
Message 4
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| Subject: | Re: Speaking of EMC filters |
>I can't hear the noise in the cockpit. I hear a very faint static
>related to the lamps but not the objectionable loud noise I hear in
>(the Archer antenna-ed) comm 2.
>
>The slight noise seems constant until I move from the cockpit to
>within about six feet of the lamp. Then it seems to increase a bit
>with proximity but even close to the antenna it's not very loud.
<snip>
>If I leave the antenna in the wingtip, it has to be close to the lamp.
> With some effort I could move the antenna. What are my options for
>blocking the emissions? If I succeeded could I expect any remaining
>antenna performance?
Hmmmm . . . no way to "block" without shielding
the lamp assembly. Doing this without diminishing
the value as a lamp is hard. Waayyyy back when
I was a Cessna when one of the strobe guys (I think
it was Whelen) sent us some hardware to play with.
Motor driven "light houses" under red domes were
the collision avoidance technology of choice.
The tubes emitted broadband noise heard as a 'pop'
in the radio. I remember Gordon Wood considering
some fine wire mesh to form a shield around the
flash tube assembly but 95% open to allow light
to pass.
I think they finally decided that the noise was
too small to be worried about . . . although
I've flown some rentals where the 'pop' was
definitely annoying.
Your story correlates with my experiments here.
I'm pretty sure it's radiation directly from the
gas filled tube. It may well be that your Archer
antenna is simply too close
>On a side note, the right lamp worked intermittently on the last
>flight. Now it seems completely dead.
Hopefully an isolated case. I'll scratch
around the 'net on HID EMC issues. I'll see
if anyone out at HBC has been looking into
it too. Doubtful. That once great airplane
company is sitting in the middle of the pond
on melting ice.
Bob . . .
>Dave Saylor
>AirCrafters
>
>
>-----
>No virus found in this message.
>Checked by AVG - www.avg.com
Bob . . .
Message 5
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>
> > I hope u like it http://www.markspeterson.com/message.php?Diane This
> > really works!
My virus checker firewalled access to this site warning
that it contained some known issues with phishing and/
or malware.
Bob . . .
Message 6
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Sorry Everybody, This account was hacked again. I did not send this.
Marty
--------
Marty Mason
Europa XS Mono
10%
Norcross, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=367092#367092
Message 7
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---------- Original Message ----------
From: "Martymason" <captainmarty@bellsouth.net>
Subject: AeroElectric-List: Re: Yippee!
Sorry Everybody, This account was hacked again. I did not send this.
Marty
--------
Marty Mason
Europa XS Mono
10%
Norcross, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=367092#367092
I would advise anyone with an 'ATT; connected account like sbcglobal, bellsouth
etc to immediately change their logon information. Make the password long and
complicated and change it often. I suspect an inside person is responsible
for this hacking. You are the fifth person in the last 30 days to be infected
(that I am aware of) and all have been associated with ATT and/or Yahoo.
It is a pain and frustrating to undo the damage.. I was one of the five...
Earl
Message 8
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| Subject: | Re: Servo problem |
Bob,
Before I go ripping into my headliner, I put the question to the Aveo engineers
about the interference that the EyeBeam was getting from somewhere.
They suggested this:
http://www.lineagepower.com/oem/pdf/FLT012A0Z.pdf
If you think this is the right track, does it go on the antagonist wiring or the
EB wiring?
Cheers,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=367095#367095
Message 9
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| Subject: | Re: Servo problem |
At 04:25 PM 2/23/2012, you wrote:
>
>Bob,
>
>Before I go ripping into my headliner, I put the question to the
>Aveo engineers about the interference that the EyeBeam was getting
>from somewhere.
>They suggested this:
>
>http://www.lineagepower.com/oem/pdf/FLT012A0Z.pdf
>
>If you think this is the right track, does it go on the antagonist
>wiring or the EB wiring?
I looked up the product and found the wiring
diagrams. THAT filter is like killing fleas
with a 12 gauge . . .
How many of these devices are installed on your
airplane?
Bob . . .
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