#New connections.... The pics are self explanatory, but here it goes:
Tx Side
The orange wire carries the signal to the audio IN of your video Tx (black is ground and only connected in one side), the orange disk is a ceramic capacitor marked 473 (47nF) so far it is the value that works better.
EDIT: I am trying now this instead of the above (the above work well, but I notice some banding in the video, thus the change):
Pay attention to the audio level of the Arduino output in order to not saturate audio input of your video Tx.
Use a GND --1.8kOhm --|--8.2KOhm--pin10
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audio Input
Power from the lipo to the RAW pin of the arduino and also the ground (bear in mind common ground and ONLY effective connection to Ground -avoid ground loops-), the green wire brings the gps signal, in this case 9600bps, but you have to adapt t your gps unit change it in the code also).
Fixed to the TS with double side foam.
Rx Side
New photo-schematic to follow:
Example of servo connections using a stripboard for simplicity and wire arrangement PIN9 for PAN and PIN10 for TILT
The audio "adapter" schematic, borrowed from other modem project.
Bench used filter.
filter adapted to a pcb board.
One winch servo for PAN (Servo GWS S125 1T de 360ยบ or other) and a regular Futaba F148 (or equivalent) for TILT. All ready to roll.