Antenna swivel. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antennas. Technology
Comments on the article
Rotating antennas are finding increasing use among radio amateurs engaged in television and work on short or ultra-short waves. Many people are put off by the use of such antennas because of their complexity. The following describes a relatively simple swivel assembly operating on the principle of a top.
A television antenna with a rotary assembly is shown in 3 in fig. 1. Pipe 2 is fixedly connected directly to the upper part of the mast using flange 1. A rotary pipe section 2 is inserted into pipe 6, in the upper part of which there are antenna elements, and the lower one, shown in the drawing, rotates in rings 7 and 9, which work as radial sliding bearings.
Rice. 1. The upper part of the antenna with a swivel "top"
To receive the load from the antenna, a thrust bearing is used, it is clamped by a cover 8. An ordinary twist drill is fixedly inserted into the end of the pipe 6, two balls from a ball bearing are placed in the boss 4 into the grooves of the drill, which are placed in the boss 4. The boss XNUMX moves up and down the drill, and from radial displacement, it is limited to two symmetrical grooves (the grooves in the drawing are not shaded).
When we tension the cord down, the boss 4, overcoming the tension of the springs, moves down along the groove of the pipe 2 until it stops with bolts 5 to the end of the groove of the pipe. Between the two balls, a force is generated on the turning arm, due to which the drill rotates, and the pipe section with the antenna also rotates with it.
When the tension cord is lowered, the springs, compressing, produce a return rotation. Braking, or rather fixing the turning part, is carried out using a brake lever, which sticks into the pipe 6 with a sharp end when the cord is tensioned, when it is loosened, the spring retracts the brake lever. In the manufacture of such a rotary assembly, it is necessary that the television antenna with the vibrator be centered and, as far as possible, planted closer to its upper part (cover 8). This is done in order to reduce the distortion on the shoulder between the two rings 7 and 9. The inside of the knot should be lubricated with technical petroleum jelly.
Table 1
| NN |
Name of parts |
Quantity |
Material |
Weight of 1 piece (kg) |
| 1 |
Pipe. O 1/4", l=475 |
1 |
ST-3 |
1.5 |
| 2 |
Lid 82x12 |
1 |
ST-3 |
0,308 |
| 3 |
Ring O 89X15 |
1 |
ST-3 |
0.4 |
| 4 |
Ring O 68/66X12 |
1 |
ST-3 |
0,03 |
| 5 |
Thrust ball bearing to No. 8109 |
1 |
cn. CT |
0,15 |
| 6 |
Thrust ring O 68X30 |
1 |
ST-3 |
0,5 |
| 7 |
Bolt М12Х30 |
2 |
ST-3 |
0,04 |
| 8 |
Nut М12 |
2 |
ST-3 |
0,024 |
| 9 |
Spring O 20 |
2 |
ST-65G |
0.19 |
| 10 |
Pipe O 76X3,5; l=670 |
1 |
ST-3 |
4,15 |
| 11 |
Ring O 68x30 |
1 |
ST-3 |
0,53 |
| 12 |
Insert O 35x40 |
1 |
ST-3 |
0,238 |
| 13 |
Twist drill Ø 17 mm |
1 |
cn. CT |
0.4 |
| 14 |
Ball O 10 |
2 |
cn. CT |
0,004 |
| 15 |
Boss O 68X30 |
1 |
ST-3 |
0,15 |
| 16 |
Bolt spec. M12X40 |
2 |
ST-3 |
0,075 |
| 17 |
Pipe O 11/4", l=150 |
1 |
ST-3 |
0,47 |
| 18 |
Wire O 4, l=15000 |
1 |
ST-0 |
1,4 |
| 19 |
Flange O 160/77x12 |
1 |
ST-3 |
1,4 |
| 20 |
Bolt М12Х26 |
1 |
ST-0 |
0.037 |
| 21 |
Washer 8 |
1 |
ST-0 |
0,0023 |
| 22 |
Cotter pin O 2x20 |
1 |
ST-0 |
0,005 |
| 23 |
Corner 25x25x4, l=30 |
2 |
ST-3 |
0,04 |
| 24 |
Roller O 8X28 |
1 |
ST-3 |
0,008 |
| 25 |
Wire O 3, l=15000 |
1 |
ST-0 |
0,83 |
| 26 |
Lever l=80 |
1 |
ST-5 |
0,1 |
| 27 |
Spring O 20 |
1 |
ST-65G |
0.19 |
| 28 |
Ear 25X20X4 |
1 |
ST-3 |
0,015 |
Authors: E. Mandro, N. Zakrevskiy, Smila, Cherkasy region; Publication: N. Bolshakov, rf.atnn.ru
See other articles Section Antennas. Technology.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
Petgugu Global cat litter
15.04.2024
Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>
The attractiveness of caring men
14.04.2024
The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
| Random news from the Archive Panic among mice
10.04.2004
When a fire breaks out in a theater or discotheque, it is not uncommon for people to rush to the only exit in a panic and crush each other.
Employees of the Philippine University modeled this situation on mice. Six dozen mice, enclosed in a container of water, tried to get to a dry surface through doors of different widths. The dimensions of the exit were changed in such a way that at first one mouse could slip into the slot, then two, three and four at the same time, the distance between the doors was also different. The number of mice in the cage remained unchanged - as soon as one slipped out, they planted another, so that the situation of panic was constantly maintained.
It turned out that the mice got out of the trap faster when only one individual could climb through the door: then the animals lined up. As soon as the gap was widened, they began to push and fight each other. As a result, they needed more time to get to a dry place.
In addition, when the doors were spaced too close to one another, the groups of mice mixed up, further slowing down the exit. The results of the experiment are consistent with the data of a computer program that simulates human behavior in a panic situation.
Filipino scientists hope that this will help architects in the design of buildings: fleeing, people will be forced to form a queue. However, most computer models of panicking crowds and experiments with animals do not correspond very well to real cases, since they cannot take into account the psychological aspects of human behavior: during the evacuation, many people show exceptional selflessness.
|
Other interesting news:
▪ Panel thermostats series 7T81 from Finder
▪ Social navigator for cyclists
▪ 64MP ISOCELL Bright GW1 sensor for smartphones
▪ Blurred Text Decoder
▪ Seagate BarraCuda 510 M.2 SSDs
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Audio and video surveillance. Selection of articles
▪ article Basket from the ball. Tips for the home master
▪ article How is the Terminator different from the Herminator? Detailed answer
▪ article Juniper Cossack. Legends, cultivation, methods of application
▪ article 144 MHz car antenna. Encyclopedia of radio electronics and electrical engineering
▪ article Invisible inscriptions - how to make them and how to show them. Chemical experience
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese