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Gore,
IW Microwave (formerly Insulated Wire Corp.),
MegaPhase,
RF Depot,

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NOTES ON COAXIAL CABLE:
A coaxial cable consists of an insulated center conductor surrounded by a conductive sheath, which is typically made out of tinned copper braid, and an insulating outer sheath. Since the two conductors share the same axis, this type of cable is called "co-axial."
Two coaxial cables may look the same, yet have different CHARACTERISTIC IMPEDANCES. Their connectors can seem to be identical, having subtle differences that an expert can spot upon careful inspection. In electromagnetic compatibility (EMC) testing, most instruments have 50 Ohm impedances, so 50 Ohm cables are needed. In television and other video systems, most devices have impedances of 75 Ohms, and 75 Ohm cables are needed. If you accidentally use a 75 Ohm cable with a 50 Ohm instrument, your measurements may be off by an unacceptable amount. In some cases, this could even damage an instrument. You can tell the difference by reading the RG number, which is usually written in tiny letters, (along with other numbers) somewhere on the cable. Most electromagnetic compatibility testing laboratories need to have both types of cables on hand, and it is easy to grab the wrong cable when you are in a hurry. For this reason, it is a good idea to store them separately.
Coaxial cables are generally designed for laboratory E3 ELECTROMAGNETIC ENVIRONMENTAL EFFECTS use, and they are often damaged when doing field tests ( also known as "on-site tests" and, in europe, "in-situ tests.") Some of the manufactureres listed here offer RUGGEDIZED coaxial cable, which is specially designed for on-site tests.

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