28-01-2016, 07:45 AM
The circuit design was OK, the mechanical arrangements were not. The crosspoints were mounted on plug-in modules, typically 10 on a module. The individual pins on the modules frequently made bad contact with the sockets on the main board. Also suffered from dry joints on the plug-in module as the pins tried to twist as the modules were plugged/unplugged.
Later Cox stuff used thick film hybrids, one per crosspoint, based on the same circuit. These worked very well.
Many years later I did some video router designs for Quartz using Analogue devices AD8116 16x16 video switch chips. This was real trailing edge tech, just to provide Quartz with a cost competitive range of analogue routers for the last few years of analogue video in broadcasting. Even if I say so myself these were very good products. Most of the design "magic" was in the physical layout and PCB layer structure.
Later Cox stuff used thick film hybrids, one per crosspoint, based on the same circuit. These worked very well.
Many years later I did some video router designs for Quartz using Analogue devices AD8116 16x16 video switch chips. This was real trailing edge tech, just to provide Quartz with a cost competitive range of analogue routers for the last few years of analogue video in broadcasting. Even if I say so myself these were very good products. Most of the design "magic" was in the physical layout and PCB layer structure.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
