This page details the various display formats and resolutions used in the Portsdown Transmitter.
Video from EasyCap
Raspberry Pi Framebuffer
The Framebuffer on the Raspberry Pi 3 is 720x576 when set to PAL output mode. If set to NTSC output mode (by manually editing /boot/config.txt) the resolution is 720x480. Note that all the graphics, test cards and image overlays are sized to work correctly in PAL output mode. Some overlays will spill out of the picture in NTSC mode.
Raspberry Pi Analog Video Output
As of Software Release 201707120, The Raspberry Pi Analog video output (available on the 4-way 3.5mm jack) is set to output PAL at 720x576@50i. If set to NTSC mode (by manually editing /boot/config.txt) the resolution is 720x480@60i.
Waveshare 3.5 inch Screen
Element 14 7 inch screen
The Element 14 7 inch display is 800x480 pixels