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A common problem of modern
city radioamateurs living in high-rise buildings is the roof antenna
installation. That is why wishing to have a multi-band "rope" which
doesn`t require so many attachment points as, for instance, "Delta" is
quite natural. But even a simple antenna like W3DZZ or Windom still
require at least 2 attachment points at your and neighboring house. In
that case the feeder entering the radioamateur window is difficult to
install at the required angle close to 90 degrees if the radioamateur
lives at the top floor. Than the only variant left is a Long Wire
antenna. But it also has disadvantages as it needs a tuner and a good
ground connection. The matching tuner must be always readjusted when
switching from one band to another.
Considering these problems I
decided to design Windom free of the above disadvantages. The new
antenna`s feature is that the feeder and the radiating curtain form the
integral unit. The locking throttle releases the radiator from the
feeder at 30 dB, and the transformer 1:6 transforms 300 Ohm resonances
at the bands of 80/40/20/17/12/10 meters to standard 50 Ohm.
 VSWR diagram CW40100
Field testing with suspension
of a higher point on a tree of 15 m high also showed excellent results.
QSO with ZD7 with the report 55 was especially memorable.
Advantages:
|
£114.95
|
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A common problem of modern
city radioamateurs living in high-rise buildings is the roof antenna
installation. That is why wishing to have a multi-band "rope" which
doesn`t require so many attachment points as, for instance, "Delta" is
quite natural. But even a simple antenna like W3DZZ or Windom still
require at least 2 attachment points at your and neighboring house. In
that case the feeder entering the radioamateur window is difficult to
install at the required angle close to 90 degrees if the radioamateur
lives at the top floor. Than the only variant left is a Long Wire
antenna. But it also has disadvantages as it needs a tuner and a good
ground connection. The matching tuner must be always readjusted when
switching from one band to another.
Considering these problems I
decided to design Windom free of the above disadvantages. The new
antenna`s feature is that the feeder and the radiating curtain form the
integral unit. The locking throttle releases the radiator from the
feeder at 30 dB, and the transformer 1:6 transforms 300 Ohm resonances
at the bands of 80/40/20/17/12/10 meters to standard 50 Ohm.
 VSWR diagram CW80100
Field testing with suspension
of a higher point on a tree of 15 m high also showed excellent results.
QSO with ZD7 with the report 55 was especially memorable.
Advantages:
|
£124.95
