T-25 Vertical Mechanical/Electrical Data

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Mechanical Data

  Radiator                    25 ft                   7.5 m
  Aluminum Tube Radiator      Diameter 0.625-1.200"   15-30 mm
  Wind Surface Area           2.3 sq ft               15 qdm
  Weight                      18 lbs plus/minus 10%   8.1 kg plus/minus 10%
  Shipping Weight             23 lbs plus/minus 10%   11 kg plus/minus 10%
  Shipping Length             6.5 ft                  2 m
  Radials (4 aluminum tubes)  4 x 8.0 ft              4 x 2.5 m

Electrical Data

  Frequency Range                                    *(1.5) 3.5-60 MHz
  Typical SWR                                         1.5 or better
**Power Rating                                      **US legal power
  Feedpoint Impedance                                 50-ohm coaxial
  Feedline                                            50-ohm coaxial
  Tuning Line                                         50-ohm coaxial
**Terminal Resistor                                 **50-ohm

        -- Typical Gain (in dB/D) --
  10-60 MHZ               0 (zero) dB/D or better
  7 MHZ                   - (minus) 2 dB/D
  3.5 MHZ                 - (minus) 6-8 dB/D
  1.9 MHZ                 - (minus) 10-12 dB/D

*Please note: At frequencies higher than 23 MHz, the T-25 acts as a "long wire." The radiation pattern becomes deformed and resembles the wing of a butterfly. Your individual mounting location may, however, be able to compensate for this effect. Therefore, the gain under 5 degrees to 15 degrees radiation angle may be either zero dB/D or even higher.

[Working Principles]
[Parts Supplied]
[Mechanical/Electrical Data]

Sommer Antennas
P.O. Box 710
Geneva, FL 32732
Phone: (407) 349-9114 | Fax: (407) 349-2485