Underwother video gallery

After purchasing and unpacking the SB-1 submarine, it turned out that there was not much space in the front section of the chamber to fit two cameras and additional equipment. Therefore, for two months, I modified the front part of the submarine to create free space. I replaced all the thick, rigid cables with thinner and more flexible ones, loosely placed the fuse holder on the wire, and converted the battery charging to a jack socket. I shortened the power supply board made of laminate by removing unnecessary components and placed it on the side of the chamber. After completing these tasks, I achieved a sufficient amount of free space in the front section.

For several months, I tested several video transmitters in the VHF band, whose schematics I found online, but without good results. Surface tests yielded good results, but after submerging the boat, I had problems receiving the signal. I decided to use miniature video transmitters operating in the 1.2GHz - 2.4GHz band, mounted in a float and connected to the boat via a thin 3-wire line. I then purchased a special waterproof 4-pin connector and installed it in the front upper part, in the location where the original hole for the video cable connection is located. I connected it with a 4.5-meter tape to the float, in which I installed the video transmitter. I used a float with a fairly high buoyancy (14g) to support the weight of the 4.5 meters of 3-wire line. I tested 4 sets of miniature video transmitters/receivers purchased on eBay, 3 of which worked correctly. In the current version, visible in the photo, I used a 2.4GHz RCA transmitter measuring 13mm x 13mm, which fits easily in the float. In front of the camera, which is supposed to continuously send video signals, I placed two LEDs; one LED indicates the boat's emergence (loss of contact with the transmitter, battery discharge, or leaks), while the other LED, connected to the GoPro camera connector, signals the activation of the camera recording. These signals are visible in the received video image. I managed to remotely activate the GoPro camera using a free RC channel and a comparator based on the LM358 circuit, which triggers recording via the camera connector when the camera settings are on the "On" button. For receiving the signal from the VGA camera, I used special TV-VGA goggles; initially, I tried to receive the image on a portable computer or a small television, but daylight made the image almost invisible. In the goggles, the image is well displayed, and moreover, they provide comfort while operating the boat.