|
Quote: Originally Posted by XJet |
|
|
|
|
|
It's all a matter of ratios Tim.
A weak RF source just a few inches away can produce exactly the same field-strength as a more powerful source at some distance (especially if directional antennas are being used). |
|
|
|
|
Obviously. But no matter what antenna is used, inverse-square losses still apply. I must admit, when I made my comment, I was thinking of the guy with the 3watt video TX that was practically touching the XPS antenna when he tested, and for a typical remote source to give that kind of field strength, well, is very unlikely, unless you are right on top of it. Let's admit facts here - most flying fields are not sitting right on top of NexRad sites and similar emitters, and the WiFi crap just can't do it, no matter what antenna you have on it not enough antenna gain possible at that distance with the input power limitations. Same with ATV - the distance will still reduce the field strength to a point that it won't be that hot. . . . For the other tests, I don't recall seeing any data on what field strengths were being used, so probably spoke a bit too soon.
And as far as Futaba and Spektrum, one of the things that has not been considered is that their performing under similar conditions may well be due to a better front end design, but it might also be due to a less sensitive receiver . . .
- Tim