[AMRadio] 50 ohms simple question

Ed Sieb esieb at sympatico.ca
Thu Apr 5 18:43:24 EDT 2007

The nominal impedance of a half-wave dipole at least one half wavelength
above ground is approximately 72 ohms.

The reason most modern radios have a 50 output impedance is due to the
preponderance of 50-52 ohm coax cable available since the Korean war.

The mismatch between 50 ohm radios and a 72 ohm antenna is  approximately
less than  1.5:1.  Virtually all modern radios can easily handle this minor


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