Erm is it this?
Star Quad is a type of cable construction used to minimise interference with Balanced Lines. This includes interference both to and from external sources, and interference between adjacent circuits within the quad.
A star quad cable consists of 4 cores tightly twisted together. Both single and multiple quads exist and they commonly have an overall screen: the screen is not essential to quad operation. It is normal for individual cores to be thinner than an equivalent pair.
A single circuit uses opposite cores of the quad, connected in parallel, to form a single balanced pair. The quad arrangement gives a magnetically coaxial structure and the compact, short lay-length allows any induced interference to be more accurately cancelled at a differential input. The cable inductance is also halved and this tends to extend the HF limit in low impedance circuits such as microphone runs. Improvements in interference reduction of the order of 20 dB are often found compared to a standard twisted pair.
It is important that opposing cores are used to make each leg of the balanced pair otherwise the interference rejection will be compromised.
Nag.
Star Quad is a type of cable construction used to minimise interference with Balanced Lines. This includes interference both to and from external sources, and interference between adjacent circuits within the quad.
A star quad cable consists of 4 cores tightly twisted together. Both single and multiple quads exist and they commonly have an overall screen: the screen is not essential to quad operation. It is normal for individual cores to be thinner than an equivalent pair.
A single circuit uses opposite cores of the quad, connected in parallel, to form a single balanced pair. The quad arrangement gives a magnetically coaxial structure and the compact, short lay-length allows any induced interference to be more accurately cancelled at a differential input. The cable inductance is also halved and this tends to extend the HF limit in low impedance circuits such as microphone runs. Improvements in interference reduction of the order of 20 dB are often found compared to a standard twisted pair.
It is important that opposing cores are used to make each leg of the balanced pair otherwise the interference rejection will be compromised.
Nag.