Difference between revisions of "Wood & Douglas FM TV equipment"
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| − | 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. | + | 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. Many of their products are described in their 1984 Catalogue: [[Media:1984 WD Catalogue.pdf|1984 WD Catalogue]] |
| − | '''VIDIF''' | + | '''VIDIF'''<br /> |
| − | |||
| − | [[ | + | 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). |
| + | |||
| + | [[Media:VIDIFp1.pdf|VIDIF descriptive text]]<br /> | ||
| + | [[Media:VIDIFp2.pdf|VIDIF circuit diagram & pcb layout]]<br /> | ||
| + | [[Media:VIDIFp3.pdf|VIDIF component list]]<br /> | ||
| + | <br /> | ||
| + | '''VP/D1'''<br /> | ||
| + | |||
| + | 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).<br /> | ||
| + | <br /> | ||
| + | [[Media:VPD1p1.pdf|VP/D1 circuit diagram & pcb layout]]<br /> | ||
| + | [[Media:VPD1p2.pdf|Emphasis characteristic curves]]<br /> | ||
| + | <br /> | ||
| + | '''FIF1'''<br /> | ||
| + | <br /> | ||
| + | The FIF1 was a 6MHz sound sub-carrier reception board to go with the VIDIF board above. | ||
| + | |||
| + | <br /> | ||
| + | [[Media:FIF1p1.pdf|FIF1 description]]<br /> | ||
| + | [[Media:FIF1p2.pdf|FIF1 pcb layout]]<br /> | ||
| + | [[Media:FIF1p3.pdf|FIF1 component list]]<br /> | ||
| + | <br /> | ||
| + | '''1250DC50'''<br /> | ||
| + | <br /> | ||
| + | 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. | ||
| + | <br /> | ||
| + | [[Media:1250DC50p1.pdf|1250DC50 description]]<br /> | ||
| + | [[Media:1250DC50p2.pdf|1250DC50 connections]]<br /> | ||
| + | [[Media:1250DC50p3.pdf|1250DC50 circuit diagram]]<br /> | ||
| + | [[Media:1250DC50p4.pdf|1250DC50 pcb layout]]<br /> | ||
| + | [[Media:1250DC50p5.pdf|1250DC50 alignment instructions]]<br /> | ||
| + | <br /> | ||
| + | '''WDV400/1200'''<br /> | ||
| + | <br /> | ||
| + | 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. | ||
| + | <br /> | ||
| + | [[Media:WDV400-1200p1.pdf|WDV400/1200 description and circuit]]<br /> | ||
| + | <br /> | ||
| + | '''70cm Equipment'''<br /> | ||
| + | <br /> | ||
| + | Wood and Douglas also produced some 70cm equipment. This sheet shows the system layout for their full 10W TV Transceiver Package. | ||
| + | <br /> | ||
| + | [[Media:WD 70cm System.pdf|WD 70cm System Layout]] | ||
Latest revision as of 11:17, 3 February 2020
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. Many of their products are described in their 1984 Catalogue: 1984 WD Catalogue
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 descriptive text
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).
VP/D1 circuit diagram & pcb layout
Emphasis characteristic curves
FIF1
The FIF1 was a 6MHz sound sub-carrier reception board to go with the VIDIF board above.
FIF1 description
FIF1 pcb layout
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.
1250DC50 description
1250DC50 connections
1250DC50 circuit diagram
1250DC50 pcb layout
1250DC50 alignment instructions
WDV400/1200
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
70cm Equipment
Wood and Douglas also produced some 70cm equipment. This sheet shows the system layout for their full 10W TV Transceiver Package.
WD 70cm System Layout