Recently, I have been looking for a look. What? I want to find a wide frequency receiving antenna for my own maque receiver / radio. The diamond and the eagle’s cone the antenna, but I feel that two shapes and volume are too large, the height is one meter seven, the perimeter is 85 cm, I don’t have outdoor, but put in the indoor study is too obses. NS. This can be broken, but I have to search for a more than one thing.
Suddenly, in front of you, I saw a cool appearance antenna, but a small size of a small size, a lot of a circle than the drill and the eagle, I looked at the foreigners to use it directly on the window sill. I seem to catch a life-saving straw, follow the understanding of the situation, see what antenna is.
It turned out that it is a desktop scanner antenna of the British "Space City" brand. It is said that it is a broadband desktop scanner receiving antenna. The applicable frequency range is 25-2000MHz, which is equipped with a magnetic base having a diameter of 12.5 cm. Place the antenna in a stationary car. 70 cm in the audience, standard with a 4-meter-long RG58 cable. What is the actual use effect of this antenna? Please take a look at the experience of the British player.
In the past many years, I have started "Space City" amateur band and CB band antenna, and their performance performance is very good, but this scanner antenna is almost useless. I live on a mountain at an altitude of 820 feet high. The antenna is installed on the attic, I am looking forward to the reception effect of this antenna. The reception effect of the civil aviation band is OK, but it is not expected, the UHF band horse tiger, and the VHF band (including 2m band) is very bad. I use a low-cost hand-held radio manufactured by China to receive a single rubber antenna to receive a signal of 2 meters of bands, but this scanner antenna is not received. I checked it with antenna analyzer, confirming my guess, this antenna cannot generate resonance in VHF frequencies, and in the air band and UHF band. I really don’t recommend this antenna.
Let me talk about the advantages of the "Space City" antenna. This is an indoor antenna, but with a magnetic base, it can be used outdoors. Gain is good, you can receive the signal that I have received by my other antennas; the connection cable is very long; it is easy to assemble and disassemble.
The disadvantage of this antenna: The magnetic base is only placed on a very smooth car to be stabilized. If you put it outside when driving, you will definitely make it bad, and you will damage your car, because Its suction is not so big. This is really not a shortcoming, because people don’t say this is an antenna that can be used. In addition, there is no shortcomings.
I bought this antenna a long time. The performance performance is too bad, so I will throw it, and I don’t know why the effect is so bad. I have just started a NANO VNA antenna analyzer and check its resonance. All the questions are clear at once. In addition to a narrower frequency point of 369 MHz, there is no standing wave ratio below 2 below 500 MHz, and 1.1GHz is OK. The specification of the label is available for 25-2000MHz, it’s really joking! Let’s get a nano VNA antenna analyzer, it is very cheap. This time we can also test the antenna as a profession.
Text: Wireless electric lead aircraft and other translation: radio comment translation Source: Amazon