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eHam Forums => Station Building => Topic started by: RANKO on May 30, 2004, 08:00:44 PM



Title: 1/2 Wave Dipole
Post by: RANKO on May 30, 2004, 08:00:44 PM
I am trying to get into ham radio, but I am confused about antennas.  How  would I figure out the demisions for an antenna to transmit on 7.233.50?


Title: 1/2 Wave Dipole
Post by: RANKO on May 30, 2004, 08:05:27 PM
1/2 Wave Horizontal Dipole Antenna is what I meant to say.  


Title: 1/2 Wave Dipole
Post by: KE6PKJ on May 31, 2004, 01:02:21 PM
468 is the magic number.

468 divided by (your frequency)7.23350 = 64.699 feet.

That is the total length of the dipole, each leg of the dipole will be half of that, ie: 32.349 feet.


Title: 1/2 Wave Dipole
Post by: KT8K on September 10, 2004, 11:37:09 AM
Note that, if it is mounted less than a 1/4 wave above ground, it may need to be shortened a bit to reach resonance.  This is not as pronounced on 40m as it is on 80m (where my friend's low 80m dipole wound up being only 110' in length instead of the calculated 125').
Good reception and happy antenna building!  73 de kt8k - Tim