The FPV community have noticed a definite reduction in performance when comparing the reliable range of the new modular EzUHF transmitter to the original stand-alone unit, the general theory is that due to the new unit being made of plastic there is insufficient ground-plane to help the transmitter work efficiently.
We decided to carry out a simple experiment to test different antennas and their resulting performance including a dipole antenna that would in essence give the transmitter the ground-plane is so desperately requires.
The constants of the experiment are as follows:
- RX: EzUHF 8 Channel Diversity
- TX: EzUHF Taranis Module
- TX & RX Firmware: v1.50
- RX: Pair of sander Style monopoles.
- Tested Range: 800m (Same position for each test).
The various TX antennas tested were:
- ImmersionRC Factory ‘Rubber-duck’.
- Diamond SRH771.
- IB Crazy semi-ridged dipole.
RSSI & Packet loss results:
The lower the number the better the signal strength / connection; these are the ‘worst values’ we found at 800m.
ImmersionRC Factory ‘Rubber-duck’: 61
Diamond SRH771: 52
IB Crazy semi-ridged dipole: 49
And as a final test we tried a dipole at both ends which resulted in an RSSI reading of 43 so as you can see both ends definitely benefit from a ground-plane.
In summary the dipole made a noticeable difference over both of the mono-pole antennas, hopefully if the weather holds out while we head into autumn we can carry out a proper fail-safe test to work out the sort of comparable ranges we are seeing.