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ZS6BKW antenna
#2
I noticed a link on eHam.net to an in-depth technical article about this antenna, written by it's developer Brian Austin G0GSF (ex ZS6BKW).  It's taken from a UK QRP magazine called Sprat & starts part way down page 1.   https://www.nonstopsystems.com/radio/pdf-ant/ZS6BKW.pdf

He determined the optimum impedance for the parallel-line matching section of feedline is about 400 ohms.  That's convenient as the actual impedance of the "450 ohm" window line you can buy is about 400 ohms. 

Claimed performance is impressive for a no-ATU antenna:

band                  40m   20m    17m    12m    10m

center freq.        7.1     14.2    18.1    24.9    28.97

min. SWR          1.1:1   1.1:1   1.3:1  1.4:1   1.4:1

2:1 BW (kHz)    360      270     380    260      400

73
Dave, VE3WI
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Messages In This Thread
ZS6BKW antenna - by Marvin VE3VCG - 2021-07-29, 14:25:53
RE: ZS6BKW antenna - by VE3WI Dave - 2021-08-05, 08:36:13

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