Today's Message Index:
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1. 05:12 AM - Re: SL30 Installation help (Frans Veldman)
2. 11:04 AM - Re: SL30 Installation help (Mike Parkin)
3. 12:22 PM - Re: SL30 Installation help (John Wighton)
4. 12:24 PM - Stall spin characteristics (Fergus Kyle)
5. 12:54 PM - Re: SL30 Installation help (Frans Veldman)
6. 01:01 PM - Re: Re: SL30 Installation help (Frans Veldman)
7. 01:38 PM - Re: Re: SL30 Installation help (Mike Parkin)
8. 03:49 PM - Re: Stall spin characteristics (Robert Borger)
Message 1
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Subject: | Re: SL30 Installation help |
On 08/02/2010 12:20 PM, Paul McAllister wrote:
> I had my antenna mounted on the floor but I ended up relocating it to the
> roof. While I found that the VOR and Localizer worked fine I seemed to have
> trouble getting the Glideslope to work until I was with in a few NM of the
> outer marker. It seems to work better on the roof for me.
Keep in mind that the glidescope information is transmitted on a
frequency that is very different than the VOR/LOC frequencies. It is
recommended to use a splitter and a separate antenna for reception of
the glidescope info. You might get away with just a VOR/LOC antenna, but
this depends on the properties of the antenna. The antenna is deeply out
of tune on the glidescope frequency, and in general, antenna's that have
been reduced in size, have more problems with this and some are even
effectively shorting out the glidescope frequencies.
My dipole setup probably works better for this than any commercially
available antenna.
Frans
Message 2
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Subject: | SL30 Installation help |
Frans,
>>It is recommended to use a splitter and a separate antenna for reception
of
>>the glidescope info.
This statement is incorrect!!! The installation instructions for the SL30
recommends a single antenna installation. See SL30 Installation manual Page
16.
I have dipole antenna mounted in the right wing... the ILS works fine.
Regards,
Mike
Do not archive.
Checked by AVG - www.avg.com
15:22:00
Message 3
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Subject: | Re: SL30 Installation help |
Thanks chaps, Garmin make a big thing about the advanced design of the SL30. Hopefully
that is one of the reasons why most users seem to be able to use a single
antenna. Some circles think that a splitter corrupts the signal - but that
is conjecture!
I have ordered the Bob Archer antenna and plane to fit it on the fuse floor.
I dont currently have room for a CDI/HSI although the Dynon D10a can be configured
to work in this way l think. Phase 2 of my avionics upgrade may include a
separate CDI (this will involve removing the DI). This should then give PFD
function for D10a and the Garmin can talk to the CDI directly. Otherwise l need
a Dynon HS34 (but there is no space for it).
I guess one only gets all the toys in the right places if you start with a clean
sheet (panel) and then add .
Thanks for all your help on this one.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=307525#307525
Message 4
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Subject: | Stall spin characteristics |
William:
". It seems likely that Cliff Shaw's accident was a result of this abrupt
spin stall characteristic in landing configuration. I have a rule (though
not unique), "never skid a turn", keeping a nice margin above stall. It
seems that the Europa (and probably all super clean planes, for instance the
Cirrus), have a propensity to severe stall spin in landing configuration. "
I am tempted to agree with much of what you say. It has been my
contention that Oshkosh makles demands with which that many junior pilots
shouldn't comply. One of these is a short final with multi bank when the
authority calls for a wing-wag when inside rudder is correcting for runway
centreline. There's the critical inside rudder/inside bank pair which
prompts the inner wing stall. From there on down is mathematical.
Know your plane,
Cheers
ferg
Ps: Rudder OFF first before aileron..............
Message 5
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Subject: | Re: SL30 Installation help |
On 08/04/2010 07:01 PM, Mike Parkin wrote:
> <mikenjulie.parkin@btinternet.com>
>
> Frans,
>
>>> It is recommended to use a splitter and a separate antenna for
>>> reception
> of
>>> the glidescope info.
>
> This statement is incorrect!!! The installation instructions for the
> SL30 recommends a single antenna installation.
I was not parotting a product manual, but explaining simple physics. The
glidescope signal is transmitted somewhere around 330 MHz, while VOR/LOC
is transmitted around 110 MHz. A quarter wavelength antenna for 110 MHz
is simply far too long for 330 MHz, it is then acting as a 3/4 wave
antenna, which has no impedance of 50 ohms, the impedance the coax cable
is designed for. Losses are huge if you try to implement it this way,
and no product manual can change this simple fact of physics. IF you go
this route, a lot depends on the actual antenna configuration and lentgh
of the cable, cable routing, and so forth. (With a 50 ohms impedance the
length and routing of the cable doesn't matter, but with a huge mismatch
cutting a centimeter of a cable can make a significant difference) For
the average homebuilder without measuring equipment it is a matter of
simple luck and trial and error... or one can go the safe route and
install a splitter and an antenna which is optimized for 330 MHz and
outputs a nice 50 ohms impedance at this frequency. Pick your choice.
Complaints about the SL-30 manual should be directed to Garmin, not to
me. ;-)
Said this, I revert to my original statement that a simple dipole most
likely offers more signal at this mismatched 330 MHz frequency than some
fancy commercial antenna specifically built for 110 MHz.
In my setup this works well, but again, it IS a mismatch and the result
is probably hard do duplicate because it is dependant on cable length
and other hard to determine properties. Relocating the antenna can make
a difference, if not just only for a different cable routing and length.
If I had to fly IFR and my life would be depending on proper signal
reception, I would for sure use a dedicated 330 MHz antenna and a splitter.
Frans
Message 6
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Subject: | Re: SL30 Installation help |
On 08/04/2010 09:20 PM, John Wighton wrote:
> Thanks chaps, Garmin make a big thing about the advanced design of
> the SL30. Hopefully that is one of the reasons why most users seem
> to be able to use a single antenna.
No, it is not. The receiver has nothing to do with it. If you want to
receive two frequencies spaced that far apart, you need two antenna's,
or suffer huge losses due to cable mismatches.
> I have ordered the Bob Archer antenna and plane to fit it on the fuse
> floor.
I suspect that the Bob Archer antenna is specifically designed for
reception of VHF signals (VOR & LOC), and performs poor (if at all)
around 330 MHz (The frequency of the glide scope) It may well simply act
as a short cut for these frequencies.
If you want to go this route, ask the manufacturer how the antenna
performs for 330 MHz signals. It might well be that he objects about
using the antenna for this purpose.
Good luck and let us know how it works out.
Frans
Message 7
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Subject: | Re: SL30 Installation help |
Frans,
I would be the last to argue the technicalities of antenna losses with you.
However, what I do recognise is a useable ILS Glideslope when I see one. My
antenna is the standard copper tape type fitted under the fibre glass skin,
I have tried the ILS system on quite a few occasions now and it works fine.
It is true that the system is probably not up to certification standards,
but I consider it a possible life saver.
Regards,
Mike
Do not archive
Message 8
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Subject: | Re: Stall spin characteristics |
Fred,
I don't remember exactly what I set the tire pressure, but I remember that it was
at the low end of the recommended pressure. It's set soft for hard surfaces.
If set hi on hard surfaces it bounces like a basket ball and is a real pain
to land. If you are landing on turn, it's not too bad that way. Still, i prefer
soft tire on either surface.
The outrigger length is what was provided by the factory. One outrigger is about
an inch off the ground when the other is on the ground. I have not had it
full loaded but is possible that both outriggers could be on the ground when fully
loaded.
Yes, it rocks back and forth when taxiing but not very much. The rocking is affected
by turns and by wind. The only time I find it disconcerting is on takeoff.
That can be fixed by making sure you have aileron into the wind when you
start to advance the throttle. Just help pin the up-wind outrigger to the ground
till airborne.
Hope this helps,
Bob Borger
Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S
http://www.europaowners.org/forums/gallery2.php?g2_itemId=60232
http://www.biplaneforumgallery.com/index.php?cat=10046
Europa Flying!
3705 Lynchburg Dr.
Corinth, TX 76208
Home: 940-497-2123
Cel: 817-992-1117
On Aug 3, 2010, at 22:00, Fred Klein wrote:
>
>
> On Aug 3, 2010, at 11:00 AM, Robert Borger wrote:
>
>> If you are completing a Europa monowheel, get some dual from someone with monowheel
experience. It's a whole 'nother cat.
>
> Bob,
>
> ...jus curious...what is your tire pressure?...and, are your outrigger rod lengths
such that, when your plane sits on level pavement with fuel but nobody onboard,
your outrigger wheels touch the pavement?...or is there some side-to-side
rocking?
>
> Fred
>
>
>
>
>
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