HamGeek Loop Antenna Short Wave Radi QRP FM AM SW HF Radio Antenna 430-440MHz 5W

$126.8 Buy It Now or Best Offer
free,30-Day Returns

Seller Store tztrobot
(390) 98.7%,

Location: Shenzhen
Ships to: US,
Item: 165481873835

Restocking Fee:No
Return shipping will be paid by:Seller
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money back or replacement (buyer’s choice)
Return policy details:
Small Loop Antenna:Small Loop Antenna
Compatible Brand:Universal
Band:AM,FM,HF
Directivity:Does Not Apply
Type:Radio Antenna
Features:Small Loop Antenna
Number of Outputs:1
Compatible Product:Shortwave Radio
MPN:Does Not Apply
Number of Inputs:1
HamGeek:HamGeek

Description 430-440MHz QRP Small Loop Antenna Short Wave FM AM SW HF Radio 5W 7M-30Mhz 144M-148MHz Walkie Talkie Radio Antenna Installation: (BNC mount equipment needs to bring a pair of photography tripods) Use the right-angle adapter and double male docking to connect the antenna to the m seat at the rear of the radio station or erect the ring body to the connector on both sides of the controller and tighten, then install the tripod to the fastening seat on the back of the tuner Open the tripod, place the antenna body firmly on the tripod, and finally connect the feeder (the feeder is attached with a choke, one end of the choke is placed near the small loop antenna). Now that the small loop antenna has been connected to your radio station, you can now tune in. First introduce the function of the tuner panel. The toggle switch on the left is the band selection switch (up: 7MHz, down: 14-30MHz). The main control knob, the upper knob is the frequency tuning knob, the frequency tuning value does not change due to environmental changes; the lower knob is the impedance matching knob, the impedance matching value will change due to environmental changes. (The tuning range of the two knobs is 180 degrees, and the panel value is 0-60). When you start using the radio, select the desired frequency, and then turn the band switch to the desired band position, then adjust the impedance matching value of the lower knob to 30, and then adjust the upper knob to tune. At this time, pay attention to listening to the noise floor of the radio station. The more resonance, the louder the noise floor of the radio station (in the environment with extremely low noise floor, the antenna resonance noise floor is almost inaudible. It is recommended to let the radio station observe the standing wave). At this time, let the radio transmit (cw, fm, and am modes are available), pay attention to the standing wave indication, and fine-tune the frequency tuning knob while transmitting. Since the knob of the portable version does not have a deceleration function, the method of fine adjustment must be more delicate, and the smaller the rotation angle, the better. At this time, you can observe a significant change in the standing wave, but generally the minimum standing wave ratio will not be below 1.5. At this time, you need to adjust the impedance matching knob. It is recommended to adjust the positive and negative 5 scale values randomly, and then repeat the frequency tuning steps and observe The standing wave ratio. Due to the change in the matching value, there are two possibilities before the comparison: 1: the minimum value of the standing wave ratio decreases; 2 the minimum value of the standing wave ratio becomes larger. If the minimum value of the standing wave ratio becomes lower, it means that the impedance matching adjustment approaches the correct value and can be further adjusted. If the minimum value of the standing wave ratio becomes larger, it means that the impedance matching is far from the correct value and must be adjusted in the opposite direction. Repeat the above steps to adjust the VSWR of the antenna to 1.0. The VHF and UHF bands are fixed with the upper knob hitting 60 to the end, and the lower knob can adjust the impedance to resonate. Note: The best effect for outdoor use is to use antennas indoors as close as possible to windows, fully enclosed reinforced concrete, against walls and other environments where the standing wave ratio is not ideal. Advanced technique: when the signal is weak, you can rotate the antenna direction to improve the signal-to-noise ratio, which is conducive to reception. The unique gain lobe of the loop antenna makes the horizontal gain directivity when it is erected, and its characteristics can be used to select multiple signals in the horizontal direction. It can also reduce the co-frequency interference in the horizontal direction. Of course, If the interference signal is extremely strong, much larger than the useful signal that needs to be accepted, the attenuation effect will not be too significant, compared to the whip antenna can still have the attenuation effect. 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. 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. 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. Feedback 1. If you are dissatisfied for any reason, please don’t be quick to leave us neutral or negative feedback. We work hard to make sure EVERY CUSTOMER 100% SATISFIED and resolve any problem for you and always leave positive feedback to all our customers. 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. On May 14, 2022 at 02:34:08 PDT, seller added the following information:

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