Balun 1:49 200w Impedance Conversion Shortwave Antenna HF End-fed SSB | Air Conditioner Parts

Balun 1:49 200w Impedance Conversion Shortwave Antenna HF End-fed SSB | Air Conditioner Parts

1:49 long-line end-fed special balun

The main parameters:

1. The transformation ratio is 1:49

2. Input impedance: 50 ohms (unbalanced)

3. Output impedance: 2450 ohms (unbalanced) suitable for long-term short-wave antennas

4. Frequency range: 7/14/21/28MHz (after connecting the 20-meter vibrator, it will naturally resonate in these four frequency bands, no need for tuning, no need for debugging)

5. Standing wave: less than 1.5

6. Withstand power: 200w (SSB <200W CW<100w FM AM FSK FT8<50W)

7. Insertion loss: 0.22db

8. Dimensions: outer diameter 50x130mm

9. Weight: 350 grams (net weight, excluding outer packaging)

10. Comes with epoxy resin board, comes with 304 stainless steel ring, comes with a copper nose for connecting the vibrator, which is convenient for users to use. The other terminal of the balun can be left floating.

11. Balun has taken waterproof measures, users only need to waterproof between the M block and the cable joint.

       This balun is especially suitable for outdoor communication. For users who do not have the conditions to set up a rooftop antenna at home, it is a good choice to use this balun to make a balcony fishing rod antenna. This antenna works in a half-wavelength state for the 40-meter band, full-wavelength state for the 20-meter band, a half-wavelength state for the 15-meter band, and 2 wavelength states for the 10-meter band. Therefore, it is shown that the antenna is working in a gain state, and it is end-fed, natural resonance, free of debugging, and free of tuning. Moreover, it has special advantages in cost, finished product, debugging, and erection. It is a good choice for novices and the field.

Antenna tips
 
How can it be called a long wire antenna? Do you just pull a thread? Do not! Strictly speaking, that's just. The name of the antenna should depend on the operating frequency. If the length of the antenna is exactly half the wavelength, it is called a Ziber antenna, also called a terminal-fed dipole antenna. An antenna whose length is greater than one wavelength is called a long-line antenna. A more strict definition can be summarized as: an antenna whose length is greater than one wavelength and an integer multiple of a half-wavelength can be called a long-line antenna. So when we use the same antenna to work in different frequency bands, the name of the antenna is different? For convenience, we call the antenna that works in the lowest frequency band as a long-line antenna.
Why use a long wire antenna
    (1) It is not easy to set up antennas in cities.
    (2) With a slight gain, it has a better effect than a dipole antenna in its maximum radiation direction.
    (3) The short-range directionality is not obvious.
    (4) The needs of mobile communication.
 
Use of long wire antenna
Since it is a monopole antenna, the grounding of the radio station will give better play to the performance of the end-fed antenna. Grounding issues include that radio stations that use other antennas must also be grounded.
The erection method can refer to the following figure: