I would like to introduce you to an Open Source, low-cost digital FPV video transmission option!
Our FPV HAT for Raspberry Pi 2/3 has these key features:
Includes open source software for driving RF module, incl. transmit, receive and test apps. https://github.com/FernRF/FPV-HAT
Max. data rate approx. 500 kbit.
Supports AES-256 encryption.
Useful for e.g. long-range and/or NLOS SD "analog quality" video links (e.g. 512x288@49fps or 640x360@30fps)
OR high-res-but-low-frame rate DIY-surveillance/Robotics/RC/etc. applications
OR anything else on a Raspberry Pi that could use a 500kbit wireless UHF one-way data-link!
Set of two boards cost 70 USD (Rasberry Pi, antennas, camera etc. not included).
The FPV HAT has been developed to enable wireless transmission of hardware encoded h.264 video streams from one Raspberry Pi to another.
The available bandwith is limited to 500 kbit which in turn limits the possible resolution while still maintaining reasonable fps and latency. Video quality is comparable to analog PAL/NTSC video.
But if e.g. your ground rover needs UHF ISM-band video in the 433 Mhz band in order to send the signal through walls or vegetation. Or you want to keep your video stream truly private using hard 256 bit AES encryption, then this might be the board you need!
Also, compared to analog video, bandwith use is very limited at either approx. 300 Khz (2GFSK/300kbit) or approx. 600 Khz (4GFSK/500kbit). Using frequency offsets in software this enables a number of concurrent streams within the respective ISM bands locally.
Please note that this system requires some knowledge of Linux and Raspberry Pi to use. Users may also need to adjust transmit power to comply with local regulations.