flight-of-eye said:
ok, I am beginning to get the picture, however, if the tech spec on DJI site says that the extender is a <=17dBm, if I am correct is a amplified source, is it not? then how does adding two 9dBi antenna change the range. what is the rate of the stock antenna, per dBi rate? are the dBi antennas just increasing the amplification more then the two stock units, thus providing better range.
It's not just a matter of gain, but also a matter of noise. BTW I just got my second customer who used only a parasitic helix on the extender, LHCP 9.3 dBi and he reported 3000ft in FPV mode, that's consistent with the 3000+ft obtained with the 6.5 turns (which is capable of quite a bit more).
At this point, seeing this consistency
I am even more convinced of the good performance of the dual setup.
I am thinking about a better solution still, but I will not spill my beans, as I have received tens of orders of LHCP solutions from HK , Taiwan, and China, so I am a bit afraid about clonation.
I am a procrastinator, I always save the best for last. As soon as reports of ranges with pinwheels installed on the camera itself come in, I will be able to calculate exactly what needs to be done to produce a consistent 10,000 ft which is my goal. Of course not having one DJI mylsef slows me down quite a bit, but having many testers who trust the antennas gives me an edge too in understanding.
TOny