DIATONE Stackable SP3 40CH Switchable Power Video Transmitter with OSD and Pigtail SMA

DIATONE Stackable SP3 40CH Switchable Power Video Transmitter with OSD and Pigtail SMA

I had preordered 3 of these direct from Diatone USA 3 weeks ago and just received 1. There was a note that the other 2 would be shipped next week.

http://www.diatoneusa.com/store/p234/Diatone-SP3-40ch-VTX-0_25_200_600mw-Pigtail

This VTX has MWOSD built in, 48 channels, and power selection of 0, 25, 200, 600mw!

Here is what I got:

There are no directions on wiring or any pin diagrams. There is a 5 pin and a 7 pin socket and connector. So I traced the wires using a continuity tester and figured out most of them.

The 5 pin connector leads to a 4 pin connector for your flight controller. The white wire goes to RX and black goes to TX of any available UART. You need to enable MSP in cleanflight/betaflight/raceflight on that port.

The 7 pin connector is: positive in, ground in, unknown, unused ground, 5v camera out to camera, ground to camera, video in from camera. The confusing part on mine was that the camera ground wire was missing. Hopefully others will not be missing that. I made my own cable for it.

The VTX was not advertised to have 5v camera voltage. I tested and that is what it has. That is great. I should be able to send noisy battery voltage into the VTX and get clean 5v for the camera and have clean video.

Here is my test setup:

It works. There is a usb connection to update and configure MWOSD. I will write more later about that and how it works in flight.

I am using every UART now! 1 for sbus, 1 for smartport telemetry, 1 for this OSD. I guess no GPS for now. I love to see the speed, height, distance from home when I do have a GPS connected.

I emailed Diatone USA and they emailed me a diagram. It looks like this was supposed to on the print out but got cut off: