Wood & Douglas FM TV equipment
During the 1980's, Wood & Douglas produced a range of 1.3GHz FM TV equipment that gave many amateurs their first taste of microwave ATV operation.
VIDIF
The VIDIF was an FM TV demodulator board with an IF input of 50MHz. Separate boards were required for video de-emphasis (VP/D1) and the sound sub-carrier (FIF1).
VIDIF circuit diagram & pcb layout
VIDIF component list
VP/D1
The VP/D1 was a dual function board for video pre-emphasis (for transmission use) or de-emphasis (for reception use). Links select which function is enabled. The addition of these simple boards made a big improvement to picture quality (1-2 picture grades).
File:VPD1p1.pdf VP/D1 circuit diagram & pcb layout
File:VPD1p2.pdf Emphasis characteristic curves
FIF1
The FIF1 was a 6MHz sound sub-carrier reception board to go with the VIDIF board above.
File:FIF1p1.pdf FIF1 description
File:FIF1p2.pdf FIF1 pcb layout
File:FIF1p3.pdf FIF1 component list
1250DC50
The 1250DC50 was a tunable downconverter that tuned the entire 1.3GHz band down to an IF of 50MHz. Unlike most W&D equipment, this item was only available as a factory assembled and boxed item.
File:1250DC50p1.pdf 1250DC50 description
File:1250DC50p2.pdf 1250DC50 connections
File:1250DC50p3.pdf 1250DC50 circuit diagram
File:1250DC50p4.pdf 1250DC50 pcb layout
File:1250DC50p5.pdf 1250DC50 alignment instructions