Thursday, 26 March 2020

Ham radio-coaxial cable

Ham radio-coaxial cable

Ham radio-coaxial cable.  A number of people have been asking about coaxial cable and wanting suggestions about the type to use for patch leads, in particular,   I use RG58    for patching up to a meter or so,  it's flexible and easy to solder to PL259 plugs BNC plugs, etc used extensively by the Radio Ham Community.

The use of RG213 is recommended for a long run at HF it has around .622 dB loss at 10 Mhz if you were to use RG58 at 10Mhz you are looking at 1.5 dB loss for the same length quite a difference in loss, here is a COAX calculator to help you with frequency verse length and type of coaxial cable.

Rocket radio sells RG-213 which you can buy here it comes with PL-259 plugs fitted. Its a lot more stiff than RG58 but of course the loss is a lot less.

A number of people have asked about coax and SWR curves when using multi-band aerial arrangements, personally, I never use coax to feed multi-band aerials, you are much better using the open-wire feeder, here is a convenient calculator Click here

Trapped dipoles are fine fed with coax, the parallel tuned traps isolate one band from the other and you don't have the mismatch encountered using coax cable.

I hope this answers some of your questions and adds a few useful calculators to help you with your Ham radio aerial configuration.

Ham radio-coaxial cable

73 de John G4YDM

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