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DuMont joined the low powered tv group by showing a 50 w vhf transmitter for $10,000.
Most of the low powered tv station hopefuls plan to operate with off-air pickup of network programs. For these, Nems-Clarke Inc., Silver Spring, Md., showed a highly engineered, automatic frequency controlled, 26-tube rebroadcast receiver to sell for $850.
Heavy traffic — in the tv field — centered around the Big 4 (RCA, GE, DuMont and Philco) film scanner exhibits.
But it was DuMont, with the first open showing of its Vitascan method of live pickup without the use of cameras that gave its Multiscanner the extra fillip.
The Vitascan principle — using the flying spot scanner technique — indicated that live coverage can be provided through the use l of film scanning equipment. And, quite creditably, too.
DuMont Demonstrates
Established in a dimly lit, strobe-lighted "studio," DuMont showed how photoelectric tubes can be used to pick up and feed live action into its slide-film apparatus for low cost studio activity.
Emboldened by its success with the Vitascan process, DuMont went a step further during the week and added a "framing" method which permits the use of slides and film to be integrated with the live portion of the picture. To a viewer, it all appears a single entity.
The whole DuMont Multiscanner with Vitascan is priced at $62,000 for black and white; $96,000 for color. The "rear screen" technique means another $1,000. The Vitascan equipment itself costs $10,000 for black-and-white, $15,500 for color.
DuMont reported it had sold 18 Vita
scanners by Tuesday night. Shipment has been promised to begin in July.
The use of the small Vidicon tube for low cost film-slide scanners was best exemplified by RCA. It called its unit "3-V/ 1-V." Using its new, four-way multiplexer for feeding film and slide pictures into a camera, RCA showed how it would work with a black-and-white vidicon camera, and then with the addition of a three-vidicon color camera. For black and white, the unit adds up to $24,500 cost; for color, $37,250.
Some tv operators, apparently, are interested in acquiring the elements of a color chain but want to start with monochrome first. Several manufacturers are on to this market. Dage, for example, showed a threevidicon camera for this purpose. For blackand-white, only the green component is included. This is priced at $8,000. When the missing blue and red components are added to the camera — for another $8,000 — the station has a full-fledged color camera.
Rounding out the highlights of the equipment exhibits, these, among many others too numerous to mention, stood out:
0 RCA's 50 kw, Ampliphase transmitter for am stations. Occupying only 60 sq. ft. (compared to the up to 150 sq. ft. usually necessary for gear of this magnitude), with low power drain, long tube life, to be available late this year. Price: $95,000.
• Gates' 250 w-500 w-1 kw transmitter, as the "best buy" for Class IV locals aiming to convince the FCC that they should be permitted to use 1 kw. Priced at under $3,000.
• Port-O-Vox wireless microphone. A five-tube fm transmitter, putting out 200 milliwatts, good for up to 500 ft. Price is $1,500 for mike-transmitter, power supply and 18-tube receiver.