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| courtesy https://www.antennas27.com/27dl2-smartech.html |
The KV delta antenna at 27 MHz is a type of antenna that consists of three elements, namely two vertical elements and one horizontal element. Vertical elements are usually made from metal pipes or aluminum rods, while horizontal elements are made from coaxial cables. The KV delta antenna at 27 MHz has the main advantages of high transmit power and long range.
Here is how to make a KV delta antenna at 27 MHz:
The calculation design of a KV delta antenna at 27 MHz depends on the desired length of the antenna. The formula for calculating the length of the vertical elements is:
where wavelength is the wavelength of the radio waves at 27 MHz. The wavelength of radio waves at 27 MHz is 11.1 meters.
So, the length of the vertical elements of a KV delta antenna at 27 MHz would be:
length = 11.1 meters / 2 = 5.55 meters
The length of the horizontal element is not as critical, but it should be at least half the length of the vertical elements.
The following table shows the calculated length of the vertical elements for different frequencies:
The KV delta antenna can be mounted in a variety of ways, but the most common way is to suspend it between two supports. The supports should be at least as high as the length of the vertical elements.
The KV delta antenna is a directional antenna, meaning it is more effective at transmitting and receiving radio waves in a specific direction. The direction of maximum radiation is perpendicular to the plane of the antenna.
The KV delta antenna is a good choice for amateur radio operators who want to transmit and receive radio waves on the 27 MHz band. It is also a good choice for long-range communication.
Here are some additional considerations for the design of a KV delta antenna at 27 MHz:
- The antenna should be located away from any metal objects, as these can interfere with the radiation pattern.
- The antenna should be mounted as high as possible, as this will improve the range of the antenna.
- The antenna should be oriented in the direction of the desired signal.
Material:
Two vertical elements, each 1.2 meters long
One horizontal element, 1.5 meters long
RG-58 coaxial cable
BNC connector
Tools and materials for cable splicing
Steps:
Cut two vertical elements 1.2 meters long.
Cut one horizontal element 1.5 meters long.
Connect vertical and horizontal elements using RG-58 coaxial cable.
Connect the coaxial cable to the BNC connector.
Explanation:
Vertical elements function to transmit radio waves up and down.
Horizontal elements function to emit radio waves to the sides.
Coaxial cables function to connect vertical and horizontal elements.
The BNC connector functions to connect the antenna to the radio.
Key points:
Position vertical and horizontal elements at the same height.
Make sure the coaxial cable is securely attached to the vertical and horizontal elements.
Use a quality BNC connector to avoid signal leakage.
Antenna test:
Once the antenna is complete, you can perform a test to check whether the antenna is working properly. To carry out the test, you can use a radio with a frequency of 27 MHz.
Following are the steps to perform a KV delta antenna test at 27 MHz:
Turn on the radio and set the frequency to 27 MHz.
Connect the antenna to the radio.
Look for radio stations that have a strong signal.
If you can hear the radio station clearly, then the antenna is working properly.
Tips:
To increase the antenna range, you can use longer vertical elements.
To increase the antenna gain, you can use a reflector.
That's how to make a KV delta antenna at 27 MHz. Hope it is useful!
