John,
I have had the S-402 for years, which I believe has the same kind of a
DE and parasitic coil configurations. If my memory serves me right, the
reason they do not specify a balun, is the driven element coil is link
coupled and matched to 50 ohms, eliminating the need for a balun..
Regards,
Ray, W4BYG
On 12/9/2014 11:36 AM, John King via TowerTalk wrote:
I am putting up an S-403 Moseley three element 40 mtr. beam. Does anyone have
hands on experience with this model beam ? It has a resonating coil in the
center of each element. The manual discusses feeding directly with coax OR with
a multi-turn RF Choke made of coax. I have used both feed methods on antennas
in the past. But with this installation, I would like to use a commercially
manufactured 1:1 torroid balun of W2FMI design rated at 5KW . The manual does
not suggest use of a balun, but does not discourage the use of a balun. My
question has to do with the feed point which has a resonating coil at the
center of the driven element .
If you are familiar with the S-403 and have experience with this design, I
would like to hear from you regarding the use of a balun between the coax and
the feed point. Your input based on your knowledge and experience will be
greatly appreciated. Thanks and 73, John, K5PGW
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