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.
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).
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).
VP/D1 circuit diagram & pcb layout
Emphasis characteristic curves
The FIF1 was a 6MHz sound sub-carrier reception board to go with the VIDIF board above.
FIF1 pcb layout
FIF1 component list
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.
1250DC50 circuit diagram
1250DC50 pcb layout
1250DC50 alignment instructions
The WDV400/1200 was a 10W in, 4W out, 420 MHz to 1260 MHz Varactor Tripler. This item was only available as a factory assembled and boxed item.
WDV400/1200 description and circuit