---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Thu 04/15/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:36 AM - Re: MkIII antenna location (b young) 2. 01:04 PM - finally a bit of flying weather (Larry Cottrell) ________________________________ Message 1 _____________________________________ Time: 08:36:47 AM PST US From: "b young" Subject: RE: Kolb-List: MkIII antenna location Boyd Sorry, but now I am confused. As near VERTICAL as possible? do not archive Mike what you are describing is a quarter wave antenna with an X shaped ground plane. A di pole ( di meaning two) is a radiating element with one ground element usually mounted in a straight line, and in our case as vertical as possible. _________________ co _________________ < horizontally polarized antenna where co is the coax feed point. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Yes vertical: radio signals can be vertical OR horizontally polarized. Example. 1 most antennas on cars and trucks are vertically polarized, the broadcast antenna is mounted vertically, meaning that for best reception the receive antenna should be mounted vertically. 2 back in the old days when everyone had a T V antenna on the roof they were horizontally polarized. The broadcast antenna were horizontally mounted and the receive antennas were mounted with the elements in a horizontal position. 3 in satellite communications there is another,,,, circular polarization,,,, because satellites are generally rotating to remain stable a combination of both. When an antenna is transmitting there are 2 different types of energy that come off the antenna. Static pulses, and magnetic pulses. If both tx and rx antennas are in the same orientation the receive antenna will capture more of the energy. My picture above for an aircraft antenna should have been l l l l l l l co coax feed point of a vertically polarized antenna. l l l l l l l I hope this graphic works. There are some exceptions,,,, working with ham radio on the H F bands, when the signal is skipped off the ionosphere the static and magnetic pulses are mixed up a bit. And a vertical transmitter and horizontal receive antennas or visa versa seem to work well.. But for line of sight transmitting on vhf frequencies they do not The antenna in my aircraft has the radiating element goes from the left bottom of the nose cone, up the left side, then horizontal across the top. I never said it was perfect I said it works. It does not show, and creates no drag. The center part of a dipole antenna has the largest current flows as compared to the end. Thus it creates the largest static and magnetic components. So it is still considered vertical. I probably could have coiled the top of the antenna to keep it more vertical.. But that creates its own set of problems as well. The need for a balun or matching network. Again more than you probably needed or wanted to know Boyd Young ________________________________ Message 2 _____________________________________ Time: 01:04:43 PM PST US From: "Larry Cottrell" Subject: Kolb-List: finally a bit of flying weather http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0siAoTNYTZD 6KPbiDncNLfKZruRqx5nUO The above link is to my spot tracking page. I prefer to use the hybrid feature since it shows roads. There isn't much reason to have good sat pictures here so you won't be able to get in too close. The wind and weather finally moderated a bit or at least enough that I felt like flying for the first time in almost a month. My interest was to find a "two track" down into the Canyons that frame the Owyhee River that would allow me to take a quad from this side of the river. If I go the way that the roads are good I end up driving about 100 miles before I can even get on my quad. This way it is only about 50 miles of two track, and 15 hwy. It is very difficult here however because the roads are not signed, and the land is so featureless as to not be much help. So my plan was to press in GPS readings at the turns. Here in ranch country all the roads lead to water, generally a stock pond, so it can be a bit confusing actually trying to get somewhere. I flew 103 miles in an hour and 34 minutes. I used 4.7 gallons of fuel for 21.9 mpg average speed was 62 MPH There was a pretty good headwind and it was a bit bumpy over the canyon coming back home. My feet were cold by the time I got back on the ground, but it was nice to get out for a while. Larry Note: If you forward this email, please delete the forwarding history, which includes my email address. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.