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Posted by cdeaglejr | Sep 09, 2019 @ 10:25 AM | 906 Views
800 mm quadcopter with

square carbon fiber arms with Parallax ELEV landing legs

DJI E800 propulsion system

Pixhawk "The Cube" flight control system with Here2 GPS

FrSky X8R receiver and telemetry modules

mRo telemetry radio
Posted by cdeaglejr | Aug 19, 2019 @ 10:46 AM | 1,494 Views
Pictures of my latest quadcopter build.

Parallax ELEV frame with The Cube flight controller, DJI E310 propulsion system and FrSky radio and telemetry.
Posted by cdeaglejr | Aug 18, 2019 @ 07:49 AM | 1,091 Views
The attached PDF document describes how to build an IOS/QGC portable ground station.
Posted by cdeaglejr | Mar 24, 2017 @ 02:25 PM | 4,300 Views
I replaced the camera board on the Hubsan H501C with the one for the H501S ($55 online). Clipped an antenna cable to the 5.8 Ghz transmitter on the new board. Routed and mounted the cable to the top rear of the quad and attached a 5.8 Ghz antenna. Using a 7" 5.8 Ghz monitor to view the FPV video. Video recording to the mirco SD card and the original H501C controller still works . Haven't flown it yet; high winds off the Atlantic.

Also added an external 2.4 Ghz antenna to the H501C controller.
Posted by cdeaglejr | Aug 15, 2016 @ 05:15 PM | 3,419 Views
Several Hubsan FPV quads are supplied with a transmitter that can be easily improved. The internal 5.8 Ghz antenna can be replaced with an external antenna. Simply remove the internal antenna, drill a hole on the left side of the transmitter, and mount an antenna jack. Wire the jack to the contacts of the original internal antenna.

This transmitter eats batteries and the built-in 5.8 Ghz antenna is a poor implementation. The first modification I did was replace the internal antenna with an external antenna. It required drilling a hole in the left hand side of the case, mounting a jack for the antenna and wiring the jack to the attachment points of the original "wire" antenna. The second modification involved powering the transmitter with a 1000 mah 3S Lipo battery. The battery was wired to the transmitter using a UBEC that "steps down" the 11+ volts of the Lipo to 6 volts. The UBEC was placed inside the transmitter in the original AA cell compartment. The cable for the battery passed through the cover via a small notch cut in the cover. The Lipo was attached to the back of the transmitter using Velcro. This permits the Lipo to be recharged.
Posted by cdeaglejr | Aug 15, 2016 @ 04:53 PM | 3,964 Views
Since it takes about three hours to charge the Hubsan H501C battery with the supplied charger, it is desirable to charge the battery faster. I'm using a SKYRC e4 Balance Charger to charge the 2S 2000 mah battery. Simply plug in the balance cable, either build or buy a banana plugs-to-EC2 cable and charge the Hubsan battery at 1A. The time to recharge depends on the actual balance charger that you use. This technique should work for other Hubsan batteries with a balance cable.