[jdl]

I got it. No, it's not a switch. Just an USB extension cord, this one:

https://www.banggood.com/Down-Direction-90-Degree-Angle-Micro-USB-5-Pin-Male-To-Female-Extension-Cable-p-1022540.html?rmmds=myorder

[jdl]

Just uploaded short video of the current distance record with 100mW OpLink: 8199m. I hadn't plans for long range testing that flight, so the antenna on the TX was not the dipole but the quicker-to-install, although worse performing (at least 3dB worse compated to the classic dipole) RMILEC 433MHz SRC771:



VRX used Aomway 7 turn Helical on antenna tracker.

[Brian]

Very impressive! You're still running full telemetry at 57600bps?

[jdl]

Very impressive! You're still running full telemetry at 57600bps?

I confirm, 57600bps and full telemetry. I suppose if the dipole is used as TX antenna, 10km without failsafe are easily achievable in this configuration. For longer distances I plan to use directional antenna on TX (Moxon type maybe). Also I have some ideas to play with modified OpLinks: RFM22B replaced with 1W RFM23BP and proper linear power supply for it.