Archive for September, 2011

Trying to reach 7km with Twinstar2

This time I was not able to achieve roundtrip. Even the plane reached 7 km, the battery depleted on the way home. No damages this time.

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Twinstar2, 8×4 props, 100ish g motors.
2700 mAh 3S1P Zippy 25-30C battery
Sunsky 500mW vtx + inverted vee antenna
Lawmate vrx + 11 dBi biquad 1280 Mhz antenna
ChainLink @ low 200mW power mode.
Smalltim OSD, modified for CL LRS
Fatshark cam

Testing biquad antenna, perfect picture over 4 km

After 2km flight with omni antennas, I've decided to make biquad antenna described by IBCrazy. It impressed me how good this antenna is. I had no video reception problems what so ever for the whole 4km flight.

RSSI level shown by OSD is not calibrated, so it show no RC control, even I had a solid control and no failsafe's.

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Finally reached 2 km range

I’ve tested my new Lawmate 1.2 GHz video rx. It seems it’s quite good receiver. Sensitivity was slightly better than sunsky rx, but selectivity is much better. It was quite immune to nearby 433 MHz LRS, contrary to sunsky vrx. Due to omni antennas signal wasn’t very strong, but good enough to do the flight.

Twinstar2 3S 2600 mAh, 8×4 APC. Inverted Vee antenna for 400mW @1280MHz sunsky video tx, omni stock antenna on lawmate video rx. Archos AV500 DVR. ChainLink 433MHz LRS stock antenna 200mW mode. Fatshark camera. Also fatshark 2.4 GHz 100mW video tx on ground station, to retransmit signal to fatshark goggles.

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