Kelsey SD-1
	Serial digital Video cable
	SDV and HD-TV coaxial video cable

	Smaller diameter The advanced dielectric and build means SD-1 cables punch as good a performance as older designs of much larger diameters. This makes SD-1 a modern lighter and smaller replacement in most applications for many older analogue types, such as PSF1-3. The smaller diameter means neater and lighter looms. LSOH (plenum) rated cable Kelsey SD-1 has a low smoke zero halogen jacket that makes it suitable for many public space and installation applications.		Accurate Characteristic Impedance. SD-1 is precision 75 ohm digital video coaxial cable made specifically for serial digital video. Its close tolerance construction means that its characteristic impedance is accurately maintained. Accurate characteristic impedance is one of the fundamental factors in achieving high performance SD and HD transmission. Precision construction Tight impedance tolerance is related to the mechanical consistency of the cable. By longitudinally applying the foil and welding the seam a very precise tubular screen is formed. This gives a more precise concentric spacing between central conductor and screen then a wrapped foil or a braid would. The use of a solid core rather than a stranded also improves consistency. Foamed Dielectrics Transmission of high frequency signals is slowed down by an absorbent effect that all dielectrics have. (The dielectric is the insulation between the central conductor and the screen). To reduce this delay, (the 'propagation delay'), the dielectric in SD-1 is foamed with gas. Foaming the dielectrics dramatically improves performance. However, it requires care to ensure the dielectric is foamed absolutely consistently. We use a chemical process to do this that achieves consistency on a molecular scale.		Description Technical Full Spec Get PDF Back home
	SD multicore cables SD cable is also available as a multicore cable; SD-6 has six SD-1 cores enclosed in an overall, high flex, matt black overall jacket and SD-8 is an eight core version. SD serial digital cables incorporate many advanced techniques to make them ideal their use. Visit our Technology Centre to see in depth information about cabling technology.