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 and the sound sub-carrier.
File:VIDIFp1.pdf VIDIF descriptive text
File:VIDIFp2.pdf VIDIF circuit diagram & pcb layout
File:VIDIFp3.pdf VIDIF component list
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
The FIF1 was a 6MHz sound sub-carrier reception board to go with the VIDIF board above.