Aircraft - General
FrSky 2.4ghz - looking good so far!
FrSky 2.4ghz - looking good so far!
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An old Irvine Sanwa lives again!
Module crudely mounted externally
Scrap JR servo wire connects to the host tx
Connection details - standard Futaba
Spectrum view across the whole 2.4Ghz band with a FrSky Two-way system.
Occupied channel bandwidth. Or how much of the spectrum each channel can use.
Results of measuring the channel power of one hopping channel. Measurement is RHS under the blue bar. Range Check mode showed a 15dB drop compared to this measurement.
FrSky telemetry adapter 1b for Eagle.zip
Epoxy on the antenna wire.
30dBc range check revision.
Range testing jig, RX end. Video and CB radio on left.
RX, four cell pack, Volt meter, HXT500 servo with long white arm (heatshrink).
FrSky module, video camera, my sweep box at the back. Mounted on 4WD roof bar.
Crop of full 2.4Ghz band usage.
Crop of individual channel power analysis. Result in lower right corner.
V8FR 8Ch out of it's hard case.
LEGO block with 1/4" hole drilled in it. Glued with Zap medium CA (light sanded both faces to be glued).
Coax hole drilled in back of case, lower, so cable still reaches easily.
Hitec generic Futaba/Hitec module case
Futaba classic pinout
Aurora new pinout
New back of Tx
Original bend in standoff. No clearance in case of falls.
better, but I ended up breaking part of the metal hook. At least there is clearance now.
This small self-tapping screw locks the antenna ball in place. The innards of the ball have been removed. It's important to keep the ball straight to avoid kinking and damaging the antenna cable.
The small screw here keeps the Eflite antenna securely attached. Initially I glued a washer to the top of the ball and attached the stock antenna, but this approach is much more sturdy.
I replaced the MPX connector on the motherboard with a right-angle AMP connector I had lying around. Removing the motherboard isn't hard, you just need to be very careful with the snug connectors and soft wire that MPX use.
The antenna tube didn't strictly need to be trimmed; I did this while I was experimenting with a Spektrum module. The module itself is just held in place with some double-sided adhesive. It weighs basically nothing, so I'm not worried about it moving
Instruction Manual for FrSky Battery Voltage Sensor.doc
the Frsky pcb just fit in the original case with little mods in the plug area
an hole for the antenna and cable, no need for extension
the module with the original cover, just two small holes added
the new expanded PVC sheet (fantastic material) antenna plate
Picture of where to pick up the ppm, +ve (battery voltage) and ground on Cockpit SX. Note that the ground lead links 2 adjacent pins.
i made square hole with cutter using the futaba module plastic cover as a template, destroying it. I also had to cut some plastic nerves/ribs to have place for daughter board
daughter board after cutting rigid pins that linked it to the motherboard
rear of daughter board
here the daughterboard ready to be glued with a lot of 5min epoxy + microballoon
this is what i wanted. Everything easy to push and to see. Remember taht you have to switch on and off one of the two switched when you wnt to use telemetry (two way) receivers or normal (one way) receivers, so it's useful to have it in front.
it's easy to solder wires into the back of teacher connector. Check with voltmeter. You have to pick up + (the one is on when transmitter in also on, not the + for recharging, that is always o and it will never switch off the module), showed red, the - (s
here you seel the bridge between - and rf out. That allows you to stop the FM transmission. The ones that want to preserve FM transmission should use a switch that bridge this while power on (give + for example) the 2.4ghz module
a lot of epoxy. I hope this will ensure the daughter board will not move, falling inside the transmitter while pushing a button.
first try with cables coming from teacher connector (on the right) and from daughter board (on the left). Everything work! I can proceed with hot-glueing the motherboard. I want everything held in place so the antenna will not be stressed.
finished! Look nice!
Hot melt glue is enough. Will allow to remove in future. I hope it will not be necessary!
I had to cut slightly the 4 pins for pc serial connections. The back cover was hitting them. No problem, they were so long!
Cut the land shown X and bridge the gap with a SMT schottky diode...
Coder output : 5V peak-to-peak (0V to 5V)
Module input : 2.75V peak-to-peak (0.55V to 3.3V)
From MPS430 datasheet
BAT42 schottky in PPM line
One antenna is in a plastic sleeve on the front of the fin and the other is under the canopy. I have switched to a glass canopy since this pic was taken.
Locations for a hack module. Use a diode with the older FrSky modules...
FrSky upgrade lite
FrSky USB cable
Inside Optic 6 sport
Hitec HF module
Old and new modules
DEL and push button
FrSky module in place
Optic 6 sport with FrSky system
Start of PPM frame.
Two frames and a bit of a third.
Watch the white "snow" formerly known as wings.
Gnd, Vcc and PPM, other 2 pins unused?
JR/Graupner 35 MHz board connections
FrSky JR/Graupner module connections
4.9 mile FrSky range test.
Two antennas highlighted in red and green.
FRSky Tx Module.pdf
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