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#13
June 25th 08, 02:16 AM
posted to rec.radio.amateur.antenna,sci.electronics.design
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Does a HF vertical antenna need a balun?
On Tue, 24 Jun 2008 17:41:31 -0700 (PDT), Nick
wrote: I also don't want to add what may be a useless choke at the antenna's feedpoint, since that would decrease the antenna system's efficiency due to the choke's resistive losses... Hi Nick, A choke at the feedpoint does NOT add loss. The Choke (which may be resistive insofar as the bulk material's property) is in the Common Mode circuit. The load is in the Differential Mode circuit. You want a very, very high Z (or R, it makes no difference) in the Common Mode circuit. The choke is entirely transparent to the Differential Mode circuit. If you don't understand the difference between the two modes (and it is not a common topic outside of electronics design) then, no doubt, others will fill in (or simply go to wikipedia). 73's Richard Clark, KB7QHC |
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