Linear power amplifier for 144 MHz and 432 MHz. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Linear power amplifier for 144 MHz and 432 MHz. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / RF power amplifiers

Comments on the article

V. Schneider designed a linear power amplifier (PA) at 144 MHz and 432 MHz on the basis of high-power Mitsubishi RF modules (Fig. 1). Both modules, M57727 for 2 m and M57745 for 70 cm, provide Pout = 30...35 W in SSB at Pin = 250 mW. In the receive mode, the signal from the antenna is fed to connector 4 (HF-out), and then, through the normally closed contacts Rel.3 (pins 12, 14) and similar ones for Rel.2, to the short-circuit connector (HF-in), to which the transceiver is connected. Through the inductor L2 and normally closed contacts Rel.1 (pins 6, 8), if necessary, you can apply +12 V feeder with K2 (+ RX) to the antenna receiving amplifier if it is installed directly near the antenna.

Fig.1 (click to enlarge)

In the transmission mode, the RF signal from the transceiver enters the short circuit connector (HF-in) and causes the opening of T1 and, accordingly, the operation of Rel 1, 2, 3. In this case, the RF signal from the mobile transceiver (Pout = 2,5 W) is fed to the input IC1 through the "10 dB" attenuator. The signal amplified by it through the Rel 3 contacts (pins 8, 12) enters the K4 connector and through the feeder to the antenna.

Author: Wolfgang Schneider (DJ8ES); Publication: N. Bolshakov, rf.atnn.ru

See other articles Section RF power amplifiers.

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

Battery origami 26.06.2015

Scientists from Arizona State University (USA) have developed lithium-ion batteries that can change their shape, increasing by more than one and a half times.

The battery itself (more precisely, its individual elements) is covered with paper with a thin layer of polymer insulator, which takes all the loads on the battery. To provide flexibility in design, the paper plates are cut in a manner similar to kirigami, a variation of the Japanese art of origami paper folding.

The plates are interconnected by narrow strips, which makes it possible for them to change their relative position in space without any gaps. This allows the battery to fold, reshape, or stretch without harming the individual battery cells.

In the future, such batteries can be used in any flexible electronic structures and even clothing items.

Other interesting news:

▪ houseplant for diabetes

▪ Mitsubishi Laser TVs

▪ Light leads to the quantum world and the acceleration of supercurrents

▪ Old heart rejuvenated with stem cells

▪ LEDs are not environmentally friendly enough

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

▪ Molchalin article. Popular expression

▪ article How does a Geiger counter work? Detailed answer

▪ Article Physician-statistician. Job description

▪ article Fuel injection system Motronic. Encyclopedia of radio electronics and electrical engineering

▪ article From one coin - three. Focus secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews