Antennas S08E01 Quansheng stock antenna test скачать в хорошем качестве

Antennas S08E01 Quansheng stock antenna test

The Quansheng UV-K5(8) radio has been getting some attention of late due to its low cost and features. It's form factor seems to have a lot of curb appeal, and it seems to be positioned as the main competition to the popular recreational Baofeng radios. When I went for a hike recently, I took it along. As soon as I lost line of sight, I also lost the ability to communicate. As I was only about one mile from my contact, my first suspect was this stock antenna, so I decided to have a closer look into its measurable performance metrics, and compare it to a tuned aftermarket antenna. Timeline: 00:00 Overview of radio and antennas 00:45 Stock Antenna vs aftermarket antenna 01:00 Overview of terrain used in test (Google Earth) 02:40 Establishing baseline characteristics of the radio using a dummy load 02:50 Forward power of stock antenna 02:59 Forward power of tuned antenna (increase of 1.2W) 03:10 Standing wave comparison between antennas 03:55 VNA plots of tests for standing wave and impedance for VHF, UHF and air band. Both stock and tuned antennas are tested for VHF. Stock antenna is tested for UHF and Air band. 11:15 Taking a tuned aftermarket antenna back up the mountain to test and see if communication is possible from same point that the stock antenna lost contact. 12:25 Conclusions: The impedance of a tuned antenna is closer to the ideal 50ohms than a stock antenna. The standing wave values show an improvement with a tuned antenna. The result can be seen in the difference of forward power by a factor of 1.2W. In the unit we tested, this represents about a 25% loss in power when the stock antenna is used in the VHF band. Notes: The test equipment used in these trials is Hobby Grade. VNA Calibration for VHF was performed prior to test Aftermarket antennas used in this test are the Smiley 5/8 wave SAR, and the mparam IPX6 military grade (based on the Smiley 5/8 SAR). Our test antenna was center tuned to 150 MHz. The content of this video is for entertainment and educational purposes only. Our antenna aftermarket order form contains VNA profiles for all bands and sub bands for Smiley and mparam IPX6 antennas, and can be found here: https://forms.gle/u41pG66D62aDHS5a6