RF Cables

Coaxial Cable Buying Guide

Coaxial cable, commonly referred as COAX CABLE is your transmission line in RF applications. We could say that your coax cable is a physical medium between your transmitter and your antenna. There are many different types of coaxial cables and you might be wondering which one is going to be the most suitable for your application? Important factors to consider would be:

  1. DISTANCE – from your transmitter to antenna connection. All transmission lines including coaxial cables would have some losses. These losses are measured in dB/m and are frequency dependant. Your choice of coaxial cable would depend on operating frequency and the above mentioned distance to the antenna. Refer to particular cable specification / data sheet and select one with minimal losses to suit your application.
  2. VELOCITY FACTOR – is a measure of speed of wave through physical medium compared to speed of light in vacuum. This metric is commonly used to calculate propagation delays.  For example, RG58 would have velocity factor of approx. 66% and LL400 / LMR400 coaxial cable 85%.
  3. IMPEDANCE – ensure that you choose coaxial cable with the correct impedance for your application. Most commonly used coaxial cables for RF applications would have the impedance of 50 Ohms.


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