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#23
March 30th 06, 03:02 AM
posted to rec.radio.amateur.antenna
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what a 1:1 choke balum used for
"John Popelish" wrote in message ... wrote: John Popelish wrote: SNIP At low frequency, I understand how this is a good approach (though this discussion was about the W2DU style choke balun). But at higher frequencies, I am concerned that the turn to turn capacitance might provide a low impedance path that parallels the choke. A string of beads does not have this problem. Hi John "For what its worth", I have wounf the coax around a single ferrite toroid with the exact amount of turns and spacing so the impedance along the conductor of the coax outer shield was maximum, as in parallel resonance. I cant claim that it does any better job than any other "1:1 balun", but it worked for me. My point is - The turn to turn "stray" capacitance doesnt necessarily have to be a source of performance degradation. Jerry |
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