Firm RADIAL, leading Russian manufacturer of base station antenna-feeder systems
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  • 80-40-20-17-12-10 m
    Linear 6-band antennas CITY-Windom (CW80100), CITY-Windom (CW80500)

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    Designed by UA3AHM

    Top-fed antenna


    Base-fed antenna

    City Windom CW80500

    City Windom CW80100


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    www.duplexers.eu

    Electrical specifications
    Model CITY-Windom (CW80100) CITY-Windom (CW80500)
    80 m, VSWR not more 1.6 3.5-3.8 MHz 3.5-3.8 MHz
    40 m, VSWR not more 1.5 7.0-7.2 MHz 7.0-7.2 MHz
    20 m, VSWR not more 1.7 14.0-14.35 MHz 14.0-14.35 MHz
    17 m, VSWR not more 1.7 18.06-18.31 MHz 18.06-18.31 MHz
    15 m, VSWR not more 2.1 - -
    12 m, VSWR not more 1.5 24.9-25.14 MHz 24.9-25.14 MHz
    10 m, VSWR not more 2 28-29,5 MHz 28-29,5 MHz
    Impedance, Ohm 50 50
    Connector PL-259 PL-259
    Max. power input CITY-Windom, W 100 (PEP) 500
    Length, m 40 40
    Polarization horizontal horizontal
    Weight, kg 1,6 8.57
    Material of radiator steel brass wire, PVC insulated.

    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.

    "The fly in the ointment" was band of 21 MHz insistently unwilling to work together with the rest. Some maneuvers in that band startup bring to naught the 40 meters band.

    VSWR Diagram CW80100


    The antenna well proved itself in operation. With the output of 100 W on 80 m band Europe reports at 59 in the evening; in the daytime within the radius of 200 km the communication is in VHF. Also, a decreased noise level of that antenna was noted in the reception mode, probably due to a short-circuited matching transformer.

    A good antenna operation in WARC bands must also be noted. The band of 17 m opening in spring already in February gladden with a number of exotic station from ZL and YB.

    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.

    CW80100 H-plane pattern

    80m
    40m
    20m
    17m
    12m
    10m

    Advantages:

    • end-feed coaxial;
    • 6-band in 1 50 Ohm connector;
    • not need tuner;
    • ground not needed;
    • single line construction;
    • low cost;
    • low VSWR;
    • 100 W PEP;
    • low weight;
    • easy installation;
    • full size;
    • high gain on high bands.