Coaxial Cables & Connectors

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Presentation transcript:

Coaxial Cables & Connectors Nicolas M1HOG & Bryan G8DKK

Slide Topics Coaxial Cables Coaxial Connectors Cable Types Coaxial Connectors Connector Types Fitting connectors to cable Tools required Testing URLs

Choice of Cable or Connector Choose Cable or Connector first? My opinion is choose the cable first because: Need to know how it will be used Main Uses: Antenna feeder Patch Lead ?

Coaxial Cables RG (Radio Guide) types UR (Uniradio) types RG58 RG213 (formerly RG8) Lots of Others Westflex, Ecoflex, M&P, LMR UR (Uniradio) types UR67

Properties of Coax Cables Loss per metre Resistive loss Dielectric loss Maximum Frequency of operation Mostly determined by diameter And to a lesser extent Dielectric Maximum Power rating

RG58 (/U, /BU, /CU)

URM43

RG213 (RG8, UR67)

Ecoflex10

Coax Connectors Most Common Types (used by radio amateurs) PL259 + SO239 BNC Type N (SMA) All originally designed in USA in 1940s All with PTFE (Teflon) dielectric

Crimp or Solder? Solder for preference and definitely for the centre pin Most connectors are compression fitting for the outer conductor The exception is PL259 where it is a recent option Crimp the outer ONLY if you have the correct crimping tool Do not buy cheap crimping tools

PL259 Connector

PL259 Compression Plug

PL259 on RG58

PL259 on RG213

SO239 Connector

Type N Connector

Chinese N type (male)

N(m) on RG213 (Cone Mount)

Preparing RG213

Type N Chassis Mount (f)

BNC Connector

BNC on RG58

Tools

Cutting & Stripping Tools Coax stripping tool for inner & outer. Not tried but probably not worth the £10 price tag

More Tools

Testing the Connection Start with a simple DC test Test inner to inner, outer to outer then inner to outer RF Test with both ends terminated in a connector Fit a 50Ω load to one end RF test with an antenna analyser

URLs www.whwestlake.co.uk (RG cables & connectors, Westflex) www.thedxshop.com (Ecoflex cables & connectors, RG213) www.hamradio.co.uk (Messi & Paoloni cables & connectors) Most of the dealers offer RG58 & RG213 cables but beware of cheap versions, particularly RG213 that measures <10.3mm diameter