Presenting the Redifon SPT Division Model SPT9000, a high-performance RF Modulator engineered by the former SPT (Sound Powered Telephones) division in Maldon, Essex . Designed for professional marine TV distribution and broadcast headends, the SPT9000 delivers near-broadcast specification performance in a rugged 19-inch rack-mount chassis.
Built during the era when British engineering defined commercial reliability, this unit represents the legacy of Redifon and Thales communications . Whether you are restoring a vintage CCTV system, upgrading a hotel distribution network, or need a reliable RF source for industrial applications, the SPT9000 provides the output purity and signal strength you cannot find in consumer-grade equipment.
Technical Highlights & Specifications
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High Power Output: Delivers approximately 105 dBµV output, ensuring signal penetration over long cable runs without excessive noise .
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Advanced Modulation: Utilizes Vestigial Sideband (VSB) modulation to meet BBC technical specifications, ensuring minimal interference and sharp frequency response .
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Frequency Agility: Standard operation covers Broadcast channels 2-12 (VHF) and 21-69 (UHF) via the internal upconverter module .
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IF Loop: Standard 38.9 MHz Vision IF, allowing for signal cascading and external processing.
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Audio Options: Configurable for BG (5.5 MHz) or I (6.0 MHz) sound carrier standards (please specify preference at checkout).
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Durable Construction: Toroidal transformer-based power supply with isolated outputs, designed to trip an RCD less often than modern switching supplies .
Why Choose the Redifon SPT9000?
Unlike modern plastic “domestic” modulators that drift frequency and produce “snowy” images, the SPT9000 was built for mission-critical environments like naval fleets and commercial broadcast centers. The discrete component design (filter cans, not cheap SAW filters) allows for superior adjacent channel rejection .
Perfect for:
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Marine Bridge Electronics
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Vintage Computer RF Demos
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Apartment/Hotel MATV systems
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Industrial CCTV overlay
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Broadcast backup systems
