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<font face="Comic Sans MS"> I'm still figuring this all out. </font><br>
<font face="Comic Sans MS"> </font><br>
<font face="Comic Sans MS"> I will control the machine with
72MHz (or 50MHz if I can get one). The transmitter has a whip and
the receiver has a wire which you can't do much with. I'd have to
open the receiver to get access to a ground so I could make a
dipole, which is why I want to be on six meters as I have a
license to mod on that band. This is the minimum gear to fly and
I will test my airframes on that band. I won't need the
Skew-Planer for just flying</font><br>
<font face="Comic Sans MS"> </font><br>
<font face="Comic Sans MS"> There will be other radios! I
bought an Ardupilot kit which includes a radio on 915 MHz. I have
to read more on this. I know it sends telemetry from the
aircraft, but I don't if it has has a place to plug in a camera
for FPV (I would RTFM, but it didn't come with a manual!). At
915 MHz I think the Skew-planer might be too bulky, I'll have to
make one and see how it looks. I've been eying 1.2GHz radios for
FPV. At that frequency I think the Skew-Planer might be sized
right. I would use it for video from the aircraft, with data
super imposed on the stream. Legally RC is limited to 400'
altitude. The Ardupilot has the ability to fly way points and
has a safety "home" feature so when it looses the radio control
signal it flies home. This could mean the plane comes in high
from an unknown direction and I might not see it right off so
having the video and telemetry would help get it down. Also if I
use the FPV to aim a HD camera and want to shoot straight down,
then I would need signal overhead. I expect to crash, loose a
few planes, experience ground loops with the plane and with the
circuitry and lots of software problem too, in other words this is
really fun!</font><br>
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<font face="Comic Sans MS"> Tom Azlin W7SUA wrote on 4/7/2015 4:06
PM: </font>
<blockquote type="cite">Hi Alex, <br>
<br>
Might be modeling to real world reality means the two work the
same? <br>
<br>
for our ARISS event the Lindys were easy to build. So a tradeoff.
The Skew-Planar looks hard to make just like another similar
antenna whose name I forget that is circular polarized overhead
for satellite passes but uses helical elemements. Other
alternative is a pair of crossed loops like the eggbeater
antennas. but then I am thinking of 70cm or 2m only. <br>
<br>
Do you expect the RC aircraft to be more often overhead or more
often at a distance/low elevation? <br>
<br>
tom w7sua <br>
<br>
On 4/7/2015 12:32 PM, Alex Fraser wrote: <br>
<blockquote type="cite">I'd have to look again at the patterns,
but basically you are correct. <br>
I think though that it is a smaller hole in the signal pattern
with the <br>
Skew-Planar. <br>
I had a longer explanation written yesterday when I had time,
but <br>
SeaMonkey decided to crash when I hit spell check and I lost it.
<br>
<br>
Tom Azlin W7SUA wrote on 4/7/2015 3:55 AM: <br>
<blockquote type="cite">Hi Alex. <br>
<br>
I was thinking they both had a null straight up. <br>
<br>
73, tom w7sua <br>
<br>
On 4/6/2015 12:18 PM, Alex Fraser wrote: <br>
<blockquote type="cite"> From what I have read the Lindenblad
is only omnidirectional in the <br>
horizontal plane. <br>
<br>
Tom Azlin W7SUA wrote on 4/6/2015 11:32 AM: <br>
<blockquote type="cite">Hi Alex, <br>
<br>
Another antenna option might be the Lindenblad: <br>
<br>
<a class="moz-txt-link-freetext"
href="http://www.amsat.org/amsat/articles/w6shp/lindy.html">http://www.amsat.org/amsat/articles/w6shp/lindy.html</a>
<br>
<br>
We used a Lindenblad as the backup omni for the VWS ISS
contact a <br>
while back. <br>
<br>
73, tom w7sua <br>
<br>
On 4/5/2015 4:11 PM, Alex Fraser wrote: <br>
<blockquote type="cite">First Person View (FPV) is easy
to accomplish in the radio control <br>
world these days. Transmitters, receivers, cameras and
antennas on <br>
numerous bands are readily available for purchase. RC
aircraft <br>
move in <br>
3D so the antenna design must take this into
consideration, so on the <br>
aircraft's transmitter omni directional circularly
polarized are <br>
preferred. The same would be true for the aircraft's
control <br>
receiver's antenna. There is one design that kept
showing up in <br>
the ads <br>
and on the forums, I could kind of remember seeing it
in a Ham <br>
publication, but couldn't remember the name it goes by.
Most of the <br>
ads <br>
just called it a circularly polarized FPV antenna. I
kept looking <br>
until <br>
one web site used the name of the design, which I
Googled using <br>
"Skew-Planar Wheel" as the search string. I found this
site by 2 <br>
Canadian Hams <a class="moz-txt-link-freetext"
href="http://www.ve3byt.com/SkewPlanarAntenna/">http://www.ve3byt.com/SkewPlanarAntenna/</a>
which is just <br>
what I was looking for. There is enough info there to
build one on <br>
any <br>
band you choose. <br>
</blockquote>
<br>
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href="https://lists.amrad.org/mailman/listinfo/tacos">https://lists.amrad.org/mailman/listinfo/tacos</a>
<br>
</blockquote>
<br>
<br>
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</blockquote>
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No electrons were harmed in the creation of this message
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~~~********************Alex Fraser********************~~~
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