On Monday, August 22, 2016 at 11:06:47 PM UTC-4, wrote:
On Monday, August 22, 2016 at 8:21:09 PM UTC-4, WaltWX wrote:
FYI...

Britton Bluedorn's Portable PowerFlarm in a box:

https://www.dropbox.com/sh/yjzhe8wgo...jIrESm4Fa?dl=0

was of IMMENSE help and an efficient cost effective way to test the transmit/receive radiation pattern or range of your installed PF Core unit. Fortunately, he is my neighbor and loaned me the unit.

I hope that this will help others out there as well.

Walt Rogersw WX

Very interesting, I think I can guess how you use this, but I'd rather have a description of your test procedure and love to see your data.

BTW on a similar note, flarm.com will give you a range analysis purely in Horizontal 2D. This is probably the most important for anticollision, however I would be curious to also see the vertical range analysis - a side view instead of top view to to see if the pattern is good above and below.

Chris

@Chris - the beam pattern for a half dipole is maximum at 90 degrees and minimum above and below - think of a tire. See the 1/2 wave dipole antenna wiki at https://en.wikipedia.org/wiki/Dipole_antenna . See the radiation pattern demo about halfway down.

This also shows why the antenna should be vertical in the installation; otherwise, you aren't getting the maximum range in the horizontal - where the max warning is most useful...