Description
4B150W End-Fed HF Antenna 7-14-21-28MHz With Joint Waterproof Function For Radio Communications
Why use a long antenna?
(1) Antenna erection is not easy in cities. This antenna is very simple to put up.
(2) It has a slight gain, and has a better effect than a dipole antenna in its larger radiation direction.
(3) The directivity at close range is not obvious.
(4) The need for mobile emergency communications, quick putting up is needed.
Attention:
The advantages of long-line antennas are simple structure, low price and moderate gain. Compared with Yagi antennas and anti-polar periodic antennas, the long-line antenna has lower length directivity and gain. Because its gain is related to the line length, users can find the length and angle that are suitable for receiving lines. By comparing signal wavelength, the length of line can be calculated, which is very suitable for long-distance communications. When the line length is 4 times the wavelength and the elevation angle is 25 degrees, the gain is 3dB higher than the dipole antenna. When the line length is 8 times the wavelength, the gain is 6dB higher and the elevation angle drops to 18 degrees.
Specifications:
- Antenna model: 4B150w
- Features: Thanks to natural resonance, no antenna tuner is needed, with joint waterproof function
- Antenna configuration: 1 x end-fed balun, 1 x storage bag, 2.5 square oscillator 20 meters, 20 meters outdoor drawstring. The feeder is not included and must be purchased separately.
- Input power: Transmit in 30 seconds, receive in 30 seconds, below 150W in SSB, CW mode, below 100W in FT8 mode, below 70W in AM, FM, SFK mode, the following figure 67.9 degrees is a long-term use measurement, when the transmitted is greater than the receiving time ratio, the transmit power must be appropriately reduced.
4B150PLUS End-Fed Balun:
- Frequency range: 3-30mhz
- Withstand power: SSB, CWï¼150W; FM, AM, FSK ï¼70W
- To ensure the waterproof function of the connector, the vertical tilt angle should be less than 20 degrees during installation
Package Included:
- 1 x Set of End-Fed Antenna
Note: Other items pictured are not included, for demonstration purposes only.
Putting Up The Antenna:
The requirements for the erection of end-fed antenna are very low. It can work normally if it is more than 2 meters away from the ground. To achieve a desired effect, the antenna should be erected in a high and open place as much as possible. When the antenna is erected vertically, because of the low elevation angle, the communication distance is far, it is equivalent to an omnidirectional antenna now. When installed horizontally, due to the high elevation angle of the antenna, the communication distance is relatively short, and it also has a certain directivity. Refer to the figure below for specific erection methods.
Why use a long antenna?
(1) Antenna erection is not easy in cities. This antenna is very simple to put up.
(2) It has a slight gain, and has a better effect than a dipole antenna in its larger radiation direction.
(3) The directivity at close range is not obvious.
(4) The need for mobile emergency communications, quick putting up is needed.
Attention:
The advantages of long-line antennas are simple structure, low price and moderate gain. Compared with Yagi antennas and anti-polar periodic antennas, the long-line antenna has lower length directivity and gain. Because its gain is related to the line length, users can find the length and angle that are suitable for receiving lines. By comparing signal wavelength, the length of line can be calculated, which is very suitable for long-distance communications. When the line length is 4 times the wavelength and the elevation angle is 25 degrees, the gain is 3dB higher than the dipole antenna. When the line length is 8 times the wavelength, the gain is 6dB higher and the elevation angle drops to 18 degrees.
Specifications:
- Antenna model: 4B150w
- Features: Thanks to natural resonance, no antenna tuner is needed, with joint waterproof function
- Antenna configuration: 1 x end-fed balun, 1 x storage bag, 2.5 square oscillator 20 meters, 20 meters outdoor drawstring. The feeder is not included and must be purchased separately.
- Input power: Transmit in 30 seconds, receive in 30 seconds, below 150W in SSB, CW mode, below 100W in FT8 mode, below 70W in AM, FM, SFK mode, the following figure 67.9 degrees is a long-term use measurement, when the transmitted is greater than the receiving time ratio, the transmit power must be appropriately reduced.
4B150PLUS End-Fed Balun:
- Frequency range: 3-30mhz
- Withstand power: SSB, CWï¼150W; FM, AM, FSK ï¼70W
- To ensure the waterproof function of the connector, the vertical tilt angle should be less than 20 degrees during installation
Package Included:
- 1 x Set of End-Fed Antenna
Note: Other items pictured are not included, for demonstration purposes only.
Putting Up The Antenna:
The requirements for the erection of end-fed antenna are very low. It can work normally if it is more than 2 meters away from the ground. To achieve a desired effect, the antenna should be erected in a high and open place as much as possible. When the antenna is erected vertically, because of the low elevation angle, the communication distance is far, it is equivalent to an omnidirectional antenna now. When installed horizontally, due to the high elevation angle of the antenna, the communication distance is relatively short, and it also has a certain directivity. Refer to the figure below for specific erection methods.
Payment Terms
1.We accept PayPal only.
2.All major credit cards are accepted through secure payment processor PayPal.
3.Payment must be received within 7 business days of auction closing.
4.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
2.All major credit cards are accepted through secure payment processor PayPal.
3.Payment must be received within 7 business days of auction closing.
4.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay.
Shipping Terms
- For remote regions, we will charge your extra shipping costs. Usually it cost about 35USD-50USD. We will contact you after your payment. Thanks for your understanding.
Return Terms
1. If you receive defective item, please kindly notify us within 14 days. We will guide you the returning instruction for replacement or refund.
2. If you purchased in improper condition, please NOTE that the sipping and handling fee will not be refund, all return shipping fee should paid by the buyer unless item DOA.
3. We reserve the right to refuse any returns for objective reasons.
2. If you purchased in improper condition, please NOTE that the sipping and handling fee will not be refund, all return shipping fee should paid by the buyer unless item DOA.
3. We reserve the right to refuse any returns for objective reasons.
Custom Duties & Taxes
1. Import duties, taxes, and charges are not included in the item price or postage cost. These charges are the buyer's responsibility.
2. Avoiding some unnecessary trouble, please check with your country's customs office to inform us what we should declare its value before shipping.
2. Avoiding some unnecessary trouble, please check with your country's customs office to inform us what we should declare its value before shipping.
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2. If you are satisfied with the product you received, please kindly leave us a positive feedback and 5 star DSR. If there is any problem of your order, please feel free to contact us firstly, we are responsible and credible seller, will follow it for you asap.
2. If you are satisfied with the product you received, please kindly leave us a positive feedback and 5 star DSR. If there is any problem of your order, please feel free to contact us firstly, we are responsible and credible seller, will follow it for you asap.
