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vakЛеонид KM6JXE разработал и изготовил простую направленную антенну на диапазон 440 МГц.
(перепост https://www.facebook.com/leonid.pankrashin.1/posts/2169007596576760)
This homemade antenna was conceived to be small, but with good gain and acceptable bandwidth. Let's call it Ministack-430 KM6JXE.
Powering two vibrators in a stack is always difficult. Therefore, one vibrator was used. Such an attempt failed twelve years ago. The antenna worked, but the parameters did not satisfy. Now, under quarantine conditions, it has become possible to devote more time to design. A new calculation in MMANA-GAL gave the following result:
After installation, the resonance, input impedance and, as a consequence, the antenna SWR were higher than the calculated values. Antenna tuning gave the following parameters:
Next picture shows the antenna pattern measured at 0 degrees (green) and 5 degrees (red) elevations.
Dimensions: 23.6 x 15.7 x 12.8 inches.
(перепост https://www.facebook.com/leonid.pankrashin.1/posts/2169007596576760)
This homemade antenna was conceived to be small, but with good gain and acceptable bandwidth. Let's call it Ministack-430 KM6JXE.
Powering two vibrators in a stack is always difficult. Therefore, one vibrator was used. Such an attempt failed twelve years ago. The antenna worked, but the parameters did not satisfy. Now, under quarantine conditions, it has become possible to devote more time to design. A new calculation in MMANA-GAL gave the following result:
After installation, the resonance, input impedance and, as a consequence, the antenna SWR were higher than the calculated values. Antenna tuning gave the following parameters:
Next picture shows the antenna pattern measured at 0 degrees (green) and 5 degrees (red) elevations.
Dimensions: 23.6 x 15.7 x 12.8 inches.
no subject
Date: 2020-08-23 23:06 (UTC)Багато мороки з такої конструкції.
no subject
Date: 2020-08-23 23:15 (UTC)Окрім геометріі.
no subject
Date: 2020-08-24 06:48 (UTC)