The author did a test outside to prove his point in previous article. (Article link
Test equipment: DAL TX600 5.8G 600MW Transmitter, RC832 Receiver, FPV antenna.
Comparison Frequency: 5665 MHz (with receiver RC832/33#), 5945 MHz (with receiver RC832/38#).
Place QAV250 on the north side of bedroom on top roof at 11 floors (as picture below)
The monitor’s locations are at point A and B. From Point A the author can see clearly where QAV250 is, but barely can see from point B, as it was blocked by the corner of building.
(1) 5665 MHz at point A. The pictures below are comparison of connecting antenna and without connecting antenna.
Note: The original plan was to test the other antennas. When the author disconnected the antenna, he suddenly realized that even without connecting antenna the image was still clear.
(2) 5945 MHz at point A.
The pictures below are comparison of connecting antenna and without connecting antenna.
From pictures above, we can tell the difference of images quality is quite small when testing two different frequencies with connected antenna at point A. But without connecting antenna the difference is obvious.
(3) 5945 MHz at point B.
The resolution of 5945 MHz at point B is very low.
(4) 5665 MHz at point B.
We can see the image is still clear with 5665 MHz at point B.
Test result: within 32 channels, there is one better frequency resolution than others.
Note: The author is not electronic either radio professional. It’s just a simple comparison test which is a reference only for pilots.